Merge branch 'mh/maint-http-proxy-fix'
[gitweb.git] / gitweb / gitweb.perl
index 3786955fca80bfd6cc15e4cc5b8682685a3a8298..20dc5d59c22291737a2a8a7de6acce489db315bb 100755 (executable)
@@ -19,7 +19,7 @@
 binmode STDOUT, ':utf8';
 
 BEGIN {
-       CGI->compile() if $ENV{MOD_PERL};
+       CGI->compile() if $ENV{'MOD_PERL'};
 }
 
 our $cgi = new CGI;
@@ -35,6 +35,10 @@ BEGIN
 #our $projectroot = "/pub/scm";
 our $projectroot = "++GITWEB_PROJECTROOT++";
 
+# fs traversing limit for getting project list
+# the number is relative to the projectroot
+our $project_maxdepth = "++GITWEB_PROJECT_MAXDEPTH++";
+
 # target of the home link on top of all pages
 our $home_link = $my_uri || "/";
 
@@ -71,6 +75,13 @@ BEGIN
 # source of projects list
 our $projects_list = "++GITWEB_LIST++";
 
+# the width (in characters) of the projects list "Description" column
+our $projects_list_description_width = 25;
+
+# default order of projects list
+# valid values are none, project, descr, owner, and age
+our $default_projects_order = "project";
+
 # show repository only if this file exists
 # (only effective if this variable evaluates to true)
 our $export_ok = "++GITWEB_EXPORT_OK++";
@@ -90,6 +101,66 @@ BEGIN
 # (relative to the current git repository)
 our $mimetypes_file = undef;
 
+# assume this charset if line contains non-UTF-8 characters;
+# it should be valid encoding (see Encoding::Supported(3pm) for list),
+# for which encoding all byte sequences are valid, for example
+# 'iso-8859-1' aka 'latin1' (it is decoded without checking, so it
+# could be even 'utf-8' for the old behavior)
+our $fallback_encoding = 'latin1';
+
+# rename detection options for git-diff and git-diff-tree
+# - default is '-M', with the cost proportional to
+#   (number of removed files) * (number of new files).
+# - more costly is '-C' (which implies '-M'), with the cost proportional to
+#   (number of changed files + number of removed files) * (number of new files)
+# - even more costly is '-C', '--find-copies-harder' with cost
+#   (number of files in the original tree) * (number of new files)
+# - one might want to include '-B' option, e.g. '-B', '-M'
+our @diff_opts = ('-M'); # taken from git_commit
+
+# information about snapshot formats that gitweb is capable of serving
+our %known_snapshot_formats = (
+       # name => {
+       #       'display' => display name,
+       #       'type' => mime type,
+       #       'suffix' => filename suffix,
+       #       'format' => --format for git-archive,
+       #       'compressor' => [compressor command and arguments]
+       #                       (array reference, optional)}
+       #
+       'tgz' => {
+               'display' => 'tar.gz',
+               'type' => 'application/x-gzip',
+               'suffix' => '.tar.gz',
+               'format' => 'tar',
+               'compressor' => ['gzip']},
+
+       'tbz2' => {
+               'display' => 'tar.bz2',
+               'type' => 'application/x-bzip2',
+               'suffix' => '.tar.bz2',
+               'format' => 'tar',
+               'compressor' => ['bzip2']},
+
+       'zip' => {
+               'display' => 'zip',
+               'type' => 'application/x-zip',
+               'suffix' => '.zip',
+               'format' => 'zip'},
+);
+
+# Aliases so we understand old gitweb.snapshot values in repository
+# configuration.
+our %known_snapshot_format_aliases = (
+       'gzip'  => 'tgz',
+       'bzip2' => 'tbz2',
+
+       # backward compatibility: legacy gitweb config support
+       'x-gzip' => undef, 'gz' => undef,
+       'x-bzip2' => undef, 'bz2' => undef,
+       'x-zip' => undef, '' => undef,
+);
+
 # You define site-wide feature defaults here; override them with
 # $GITWEB_CONFIG as necessary.
 our %feature = (
@@ -98,10 +169,13 @@ BEGIN
        #       'override' => allow-override (boolean),
        #       'default' => [ default options...] (array reference)}
        #
-       # if feature is overridable (it means that allow-override has true value,
+       # if feature is overridable (it means that allow-override has true value),
        # then feature-sub will be called with default options as parameters;
        # return value of feature-sub indicates if to enable specified feature
        #
+       # if there is no 'sub' key (no feature-sub), then feature cannot be
+       # overriden
+       #
        # use gitweb_check_feature(<feature>) to check if <feature> is enabled
 
        # Enable the 'blame' blob view, showing the last commit that modified
@@ -117,27 +191,43 @@ BEGIN
                'override' => 0,
                'default' => [0]},
 
-       # Enable the 'snapshot' link, providing a compressed tarball of any
+       # Enable the 'snapshot' link, providing a compressed archive of any
        # tree. This can potentially generate high traffic if you have large
        # project.
 
+       # Value is a list of formats defined in %known_snapshot_formats that
+       # you wish to offer.
        # To disable system wide have in $GITWEB_CONFIG
-       # $feature{'snapshot'}{'default'} = [undef];
+       # $feature{'snapshot'}{'default'} = [];
        # To have project specific config enable override in $GITWEB_CONFIG
        # $feature{'snapshot'}{'override'} = 1;
-       # and in project config gitweb.snapshot = none|gzip|bzip2;
+       # and in project config, a comma-separated list of formats or "none"
+       # to disable.  Example: gitweb.snapshot = tbz2,zip;
        'snapshot' => {
                'sub' => \&feature_snapshot,
                'override' => 0,
-               #         => [content-encoding, suffix, program]
-               'default' => ['x-gzip', 'gz', 'gzip']},
+               'default' => ['tgz']},
 
        # Enable text search, which will list the commits which match author,
        # committer or commit text to a given string.  Enabled by default.
+       # Project specific override is not supported.
        'search' => {
                'override' => 0,
                'default' => [1]},
 
+       # Enable grep search, which will list the files in currently selected
+       # tree containing the given string. Enabled by default. This can be
+       # potentially CPU-intensive, of course.
+
+       # To enable system wide have in $GITWEB_CONFIG
+       # $feature{'grep'}{'default'} = [1];
+       # To have project specific config enable override in $GITWEB_CONFIG
+       # $feature{'grep'}{'override'} = 1;
+       # and in project config gitweb.grep = 0|1;
+       'grep' => {
+               'override' => 0,
+               'default' => [1]},
+
        # Enable the pickaxe search, which will list the commits that modified
        # a given string in a file. This can be practical and quite faster
        # alternative to 'blame', but still potentially CPU-intensive.
@@ -176,8 +266,8 @@ BEGIN
        # projects matching $projname/*.git will not be shown in the main
        # projects list, instead a '+' mark will be added to $projname
        # there and a 'forks' view will be enabled for the project, listing
-       # all the forks. This feature is supported only if project list
-       # is taken from a directory, not file.
+       # all the forks. If project list is taken from a file, forks have
+       # to be listed after the main project.
 
        # To enable system wide have in $GITWEB_CONFIG
        # $feature{'forks'}{'default'} = [1];
@@ -215,26 +305,27 @@ sub feature_blame {
 }
 
 sub feature_snapshot {
-       my ($ctype, $suffix, $command) = @_;
+       my (@fmts) = @_;
 
        my ($val) = git_get_project_config('snapshot');
 
-       if ($val eq 'gzip') {
-               return ('x-gzip', 'gz', 'gzip');
-       } elsif ($val eq 'bzip2') {
-               return ('x-bzip2', 'bz2', 'bzip2');
-       } elsif ($val eq 'none') {
-               return ();
+       if ($val) {
+               @fmts = ($val eq 'none' ? () : split /\s*[,\s]\s*/, $val);
        }
 
-       return ($ctype, $suffix, $command);
+       return @fmts;
 }
 
-sub gitweb_have_snapshot {
-       my ($ctype, $suffix, $command) = gitweb_check_feature('snapshot');
-       my $have_snapshot = (defined $ctype && defined $suffix);
+sub feature_grep {
+       my ($val) = git_get_project_config('grep', '--bool');
 
-       return $have_snapshot;
+       if ($val eq 'true') {
+               return (1);
+       } elsif ($val eq 'false') {
+               return (0);
+       }
+
+       return ($_[0]);
 }
 
 sub feature_pickaxe {
@@ -265,15 +356,17 @@ sub check_export_ok {
                (!$export_ok || -e "$dir/$export_ok"));
 }
 
-# rename detection options for git-diff and git-diff-tree
-# - default is '-M', with the cost proportional to
-#   (number of removed files) * (number of new files).
-# - more costly is '-C' (or '-C', '-M'), with the cost proportional to
-#   (number of changed files + number of removed files) * (number of new files)
-# - even more costly is '-C', '--find-copies-harder' with cost
-#   (number of files in the original tree) * (number of new files)
-# - one might want to include '-B' option, e.g. '-B', '-M'
-our @diff_opts = ('-M'); # taken from git_commit
+# process alternate names for backward compatibility
+# filter out unsupported (unknown) snapshot formats
+sub filter_snapshot_fmts {
+       my @fmts = @_;
+
+       @fmts = map {
+               exists $known_snapshot_format_aliases{$_} ?
+                      $known_snapshot_format_aliases{$_} : $_} @fmts;
+       @fmts = grep(exists $known_snapshot_formats{$_}, @fmts);
+
+}
 
 our $GITWEB_CONFIG = $ENV{'GITWEB_CONFIG'} || "++GITWEB_CONFIG++";
 do $GITWEB_CONFIG if -e $GITWEB_CONFIG;
@@ -341,6 +434,22 @@ sub check_export_ok {
        }
 }
 
+my %allowed_options = (
+       "--no-merges" => [ qw(rss atom log shortlog history) ],
+);
+
+our @extra_options = $cgi->param('opt');
+if (defined @extra_options) {
+       foreach my $opt (@extra_options) {
+               if (not exists $allowed_options{$opt}) {
+                       die_error(undef, "Invalid option parameter");
+               }
+               if (not grep(/^$action$/, @{$allowed_options{$opt}})) {
+                       die_error(undef, "Invalid option parameter for this action");
+               }
+       }
+}
+
 our $hash_parent_base = $cgi->param('hpb');
 if (defined $hash_parent_base) {
        if (!validate_refname($hash_parent_base)) {
@@ -356,17 +465,6 @@ sub check_export_ok {
        }
 }
 
-our $searchtext = $cgi->param('s');
-if (defined $searchtext) {
-       if ($searchtext =~ m/[^a-zA-Z0-9_\.\/\-\+\:\@ ]/) {
-               die_error(undef, "Invalid search parameter");
-       }
-       if (length($searchtext) < 2) {
-               die_error(undef, "At least two characters are required for search parameter");
-       }
-       $searchtext = quotemeta $searchtext;
-}
-
 our $searchtype = $cgi->param('st');
 if (defined $searchtype) {
        if ($searchtype =~ m/[^a-z]/) {
@@ -374,6 +472,17 @@ sub check_export_ok {
        }
 }
 
+our $search_use_regexp = $cgi->param('sr');
+
+our $searchtext = $cgi->param('s');
+our $search_regexp;
+if (defined $searchtext) {
+       if (length($searchtext) < 2) {
+               die_error(undef, "At least two characters are required for search parameter");
+       }
+       $search_regexp = $search_use_regexp ? $searchtext : quotemeta $searchtext;
+}
+
 # now read PATH_INFO and use it as alternative to parameters
 sub evaluate_path_info {
        return if defined $project;
@@ -454,10 +563,16 @@ sub evaluate_path_info {
        "project_index" => \&git_project_index,
 );
 
-if (defined $project) {
-       $action ||= 'summary';
-} else {
-       $action ||= 'project_list';
+if (!defined $action) {
+       if (defined $hash) {
+               $action = git_get_type($hash);
+       } elsif (defined $hash_base && defined $file_name) {
+               $action = git_get_type("$hash_base:$file_name");
+       } elsif (defined $project) {
+               $action = 'summary';
+       } else {
+               $action = 'project_list';
+       }
 }
 if (!defined($actions{$action})) {
        die_error(undef, "Unknown action");
@@ -493,11 +608,23 @@ (%)
                order => "o",
                searchtext => "s",
                searchtype => "st",
+               snapshot_format => "sf",
+               extra_options => "opt",
+               search_use_regexp => "sr",
        );
        my %mapping = @mapping;
 
        $params{'project'} = $project unless exists $params{'project'};
 
+       if ($params{-replay}) {
+               while (my ($name, $symbol) = each %mapping) {
+                       if (!exists $params{$name}) {
+                               # to allow for multivalued params we use arrayref form
+                               $params{$name} = [ $cgi->param($symbol) ];
+                       }
+               }
+       }
+
        my ($use_pathinfo) = gitweb_check_feature('pathinfo');
        if ($use_pathinfo) {
                # use PATH_INFO for project name
@@ -515,7 +642,13 @@ (%)
        for (my $i = 0; $i < @mapping; $i += 2) {
                my ($name, $symbol) = ($mapping[$i], $mapping[$i+1]);
                if (defined $params{$name}) {
-                       push @result, $symbol . "=" . esc_param($params{$name});
+                       if (ref($params{$name}) eq "ARRAY") {
+                               foreach my $par (@{$params{$name}}) {
+                                       push @result, $symbol . "=" . esc_param($par);
+                               }
+                       } else {
+                               push @result, $symbol . "=" . esc_param($params{$name});
+                       }
                }
        }
        $href .= "?" . join(';', @result) if scalar @result;
@@ -560,10 +693,17 @@ sub validate_refname {
        return $input;
 }
 
-# very thin wrapper for decode("utf8", $str, Encode::FB_DEFAULT);
+# decode sequences of octets in utf8 into Perl's internal form,
+# which is utf-8 with utf8 flag set if needed.  gitweb writes out
+# in utf-8 thanks to "binmode STDOUT, ':utf8'" at beginning
 sub to_utf8 {
        my $str = shift;
-       return decode("utf8", $str, Encode::FB_DEFAULT);
+       if (utf8::valid($str)) {
+               utf8::decode($str);
+               return $str;
+       } else {
+               return decode($fallback_encoding, $str, Encode::FB_DEFAULT);
+       }
 }
 
 # quote unsafe chars, but keep the slash, even when it's not
@@ -616,29 +756,40 @@ sub esc_path {
 # Make control characters "printable", using character escape codes (CEC)
 sub quot_cec {
        my $cntrl = shift;
+       my %opts = @_;
        my %es = ( # character escape codes, aka escape sequences
-                  "\t" => '\t',   # tab            (HT)
-                  "\n" => '\n',   # line feed      (LF)
-                  "\r" => '\r',   # carrige return (CR)
-                  "\f" => '\f',   # form feed      (FF)
-                  "\b" => '\b',   # backspace      (BS)
-                  "\a" => '\a',   # alarm (bell)   (BEL)
-                  "\e" => '\e',   # escape         (ESC)
-                  "\013" => '\v', # vertical tab   (VT)
-                  "\000" => '\0', # nul character  (NUL)
-                  );
+               "\t" => '\t',   # tab            (HT)
+               "\n" => '\n',   # line feed      (LF)
+               "\r" => '\r',   # carrige return (CR)
+               "\f" => '\f',   # form feed      (FF)
+               "\b" => '\b',   # backspace      (BS)
+               "\a" => '\a',   # alarm (bell)   (BEL)
+               "\e" => '\e',   # escape         (ESC)
+               "\013" => '\v', # vertical tab   (VT)
+               "\000" => '\0', # nul character  (NUL)
+       );
        my $chr = ( (exists $es{$cntrl})
                    ? $es{$cntrl}
                    : sprintf('\%03o', ord($cntrl)) );
-       return "<span class=\"cntrl\">$chr</span>";
+       if ($opts{-nohtml}) {
+               return $chr;
+       } else {
+               return "<span class=\"cntrl\">$chr</span>";
+       }
 }
 
 # Alternatively use unicode control pictures codepoints,
 # Unicode "printable representation" (PR)
 sub quot_upr {
        my $cntrl = shift;
+       my %opts = @_;
+
        my $chr = sprintf('&#%04d;', 0x2400+ord($cntrl));
-       return "<span class=\"cntrl\">$chr</span>";
+       if ($opts{-nohtml}) {
+               return $chr;
+       } else {
+               return "<span class=\"cntrl\">$chr</span>";
+       }
 }
 
 # git may return quoted and escaped filenames
@@ -663,7 +814,7 @@ sub unquote {
                        return chr(oct($seq));
                } elsif (exists $es{$seq}) {
                        # C escape sequence, aka character escape code
-                       return $es{$seq}
+                       return $es{$seq};
                }
                # quoted ordinary character
                return $seq;
@@ -700,21 +851,79 @@ sub project_in_list {
 ## ----------------------------------------------------------------------
 ## HTML aware string manipulation
 
+# Try to chop given string on a word boundary between position
+# $len and $len+$add_len. If there is no word boundary there,
+# chop at $len+$add_len. Do not chop if chopped part plus ellipsis
+# (marking chopped part) would be longer than given string.
 sub chop_str {
        my $str = shift;
        my $len = shift;
        my $add_len = shift || 10;
+       my $where = shift || 'right'; # 'left' | 'center' | 'right'
 
        # allow only $len chars, but don't cut a word if it would fit in $add_len
        # if it doesn't fit, cut it if it's still longer than the dots we would add
-       $str =~ m/^(.{0,$len}[^ \/\-_:\.@]{0,$add_len})(.*)/;
-       my $body = $1;
-       my $tail = $2;
-       if (length($tail) > 4) {
-               $tail = " ...";
-               $body =~ s/&[^;]*$//; # remove chopped character entities
+       # remove chopped character entities entirely
+
+       # when chopping in the middle, distribute $len into left and right part
+       # return early if chopping wouldn't make string shorter
+       if ($where eq 'center') {
+               return $str if ($len + 5 >= length($str)); # filler is length 5
+               $len = int($len/2);
+       } else {
+               return $str if ($len + 4 >= length($str)); # filler is length 4
+       }
+
+       # regexps: ending and beginning with word part up to $add_len
+       my $endre = qr/.{$len}\w{0,$add_len}/;
+       my $begre = qr/\w{0,$add_len}.{$len}/;
+
+       if ($where eq 'left') {
+               $str =~ m/^(.*?)($begre)$/;
+               my ($lead, $body) = ($1, $2);
+               if (length($lead) > 4) {
+                       $body =~ s/^[^;]*;// if ($lead =~ m/&[^;]*$/);
+                       $lead = " ...";
+               }
+               return "$lead$body";
+
+       } elsif ($where eq 'center') {
+               $str =~ m/^($endre)(.*)$/;
+               my ($left, $str)  = ($1, $2);
+               $str =~ m/^(.*?)($begre)$/;
+               my ($mid, $right) = ($1, $2);
+               if (length($mid) > 5) {
+                       $left  =~ s/&[^;]*$//;
+                       $right =~ s/^[^;]*;// if ($mid =~ m/&[^;]*$/);
+                       $mid = " ... ";
+               }
+               return "$left$mid$right";
+
+       } else {
+               $str =~ m/^($endre)(.*)$/;
+               my $body = $1;
+               my $tail = $2;
+               if (length($tail) > 4) {
+                       $body =~ s/&[^;]*$//;
+                       $tail = "... ";
+               }
+               return "$body$tail";
+       }
+}
+
+# takes the same arguments as chop_str, but also wraps a <span> around the
+# result with a title attribute if it does get chopped. Additionally, the
+# string is HTML-escaped.
+sub chop_and_escape_str {
+       my ($str) = @_;
+
+       my $chopped = chop_str(@_);
+       if ($chopped eq $str) {
+               return esc_html($chopped);
+       } else {
+               $str =~ s/([[:cntrl:]])/?/g;
+               return $cgi->span({-title=>$str}, esc_html($chopped));
        }
-       return "$body$tail";
 }
 
 ## ----------------------------------------------------------------------
@@ -724,7 +933,9 @@ sub chop_str {
 sub age_class {
        my $age = shift;
 
-       if ($age < 60*60*2) {
+       if (!defined $age) {
+               return "noage";
+       } elsif ($age < 60*60*2) {
                return "age0";
        } elsif ($age < 60*60*24*2) {
                return "age1";
@@ -765,11 +976,25 @@ sub age_string {
        return $age_str;
 }
 
+use constant {
+       S_IFINVALID => 0030000,
+       S_IFGITLINK => 0160000,
+};
+
+# submodule/subproject, a commit object reference
+sub S_ISGITLINK($) {
+       my $mode = shift;
+
+       return (($mode & S_IFMT) == S_IFGITLINK)
+}
+
 # convert file mode in octal to symbolic file mode string
 sub mode_str {
        my $mode = oct shift;
 
-       if (S_ISDIR($mode & S_IFMT)) {
+       if (S_ISGITLINK($mode)) {
+               return 'm---------';
+       } elsif (S_ISDIR($mode & S_IFMT)) {
                return 'drwxr-xr-x';
        } elsif (S_ISLNK($mode)) {
                return 'lrwxrwxrwx';
@@ -795,7 +1020,9 @@ sub file_type {
                $mode = oct $mode;
        }
 
-       if (S_ISDIR($mode & S_IFMT)) {
+       if (S_ISGITLINK($mode)) {
+               return "submodule";
+       } elsif (S_ISDIR($mode & S_IFMT)) {
                return "directory";
        } elsif (S_ISLNK($mode)) {
                return "symlink";
@@ -816,7 +1043,9 @@ sub file_type_long {
                $mode = oct $mode;
        }
 
-       if (S_ISDIR($mode & S_IFMT)) {
+       if (S_ISGITLINK($mode)) {
+               return "submodule";
+       } elsif (S_ISDIR($mode & S_IFMT)) {
                return "directory";
        } elsif (S_ISLNK($mode)) {
                return "symlink";
@@ -895,23 +1124,231 @@ sub format_subject_html {
        }
 }
 
-# format patch (diff) line (rather not to be used for diff headers)
+# format git diff header line, i.e. "diff --(git|combined|cc) ..."
+sub format_git_diff_header_line {
+       my $line = shift;
+       my $diffinfo = shift;
+       my ($from, $to) = @_;
+
+       if ($diffinfo->{'nparents'}) {
+               # combined diff
+               $line =~ s!^(diff (.*?) )"?.*$!$1!;
+               if ($to->{'href'}) {
+                       $line .= $cgi->a({-href => $to->{'href'}, -class => "path"},
+                                        esc_path($to->{'file'}));
+               } else { # file was deleted (no href)
+                       $line .= esc_path($to->{'file'});
+               }
+       } else {
+               # "ordinary" diff
+               $line =~ s!^(diff (.*?) )"?a/.*$!$1!;
+               if ($from->{'href'}) {
+                       $line .= $cgi->a({-href => $from->{'href'}, -class => "path"},
+                                        'a/' . esc_path($from->{'file'}));
+               } else { # file was added (no href)
+                       $line .= 'a/' . esc_path($from->{'file'});
+               }
+               $line .= ' ';
+               if ($to->{'href'}) {
+                       $line .= $cgi->a({-href => $to->{'href'}, -class => "path"},
+                                        'b/' . esc_path($to->{'file'}));
+               } else { # file was deleted
+                       $line .= 'b/' . esc_path($to->{'file'});
+               }
+       }
+
+       return "<div class=\"diff header\">$line</div>\n";
+}
+
+# format extended diff header line, before patch itself
+sub format_extended_diff_header_line {
+       my $line = shift;
+       my $diffinfo = shift;
+       my ($from, $to) = @_;
+
+       # match <path>
+       if ($line =~ s!^((copy|rename) from ).*$!$1! && $from->{'href'}) {
+               $line .= $cgi->a({-href=>$from->{'href'}, -class=>"path"},
+                                      esc_path($from->{'file'}));
+       }
+       if ($line =~ s!^((copy|rename) to ).*$!$1! && $to->{'href'}) {
+               $line .= $cgi->a({-href=>$to->{'href'}, -class=>"path"},
+                                esc_path($to->{'file'}));
+       }
+       # match single <mode>
+       if ($line =~ m/\s(\d{6})$/) {
+               $line .= '<span class="info"> (' .
+                        file_type_long($1) .
+                        ')</span>';
+       }
+       # match <hash>
+       if ($line =~ m/^index [0-9a-fA-F]{40},[0-9a-fA-F]{40}/) {
+               # can match only for combined diff
+               $line = 'index ';
+               for (my $i = 0; $i < $diffinfo->{'nparents'}; $i++) {
+                       if ($from->{'href'}[$i]) {
+                               $line .= $cgi->a({-href=>$from->{'href'}[$i],
+                                                 -class=>"hash"},
+                                                substr($diffinfo->{'from_id'}[$i],0,7));
+                       } else {
+                               $line .= '0' x 7;
+                       }
+                       # separator
+                       $line .= ',' if ($i < $diffinfo->{'nparents'} - 1);
+               }
+               $line .= '..';
+               if ($to->{'href'}) {
+                       $line .= $cgi->a({-href=>$to->{'href'}, -class=>"hash"},
+                                        substr($diffinfo->{'to_id'},0,7));
+               } else {
+                       $line .= '0' x 7;
+               }
+
+       } elsif ($line =~ m/^index [0-9a-fA-F]{40}..[0-9a-fA-F]{40}/) {
+               # can match only for ordinary diff
+               my ($from_link, $to_link);
+               if ($from->{'href'}) {
+                       $from_link = $cgi->a({-href=>$from->{'href'}, -class=>"hash"},
+                                            substr($diffinfo->{'from_id'},0,7));
+               } else {
+                       $from_link = '0' x 7;
+               }
+               if ($to->{'href'}) {
+                       $to_link = $cgi->a({-href=>$to->{'href'}, -class=>"hash"},
+                                          substr($diffinfo->{'to_id'},0,7));
+               } else {
+                       $to_link = '0' x 7;
+               }
+               my ($from_id, $to_id) = ($diffinfo->{'from_id'}, $diffinfo->{'to_id'});
+               $line =~ s!$from_id\.\.$to_id!$from_link..$to_link!;
+       }
+
+       return $line . "<br/>\n";
+}
+
+# format from-file/to-file diff header
+sub format_diff_from_to_header {
+       my ($from_line, $to_line, $diffinfo, $from, $to, @parents) = @_;
+       my $line;
+       my $result = '';
+
+       $line = $from_line;
+       #assert($line =~ m/^---/) if DEBUG;
+       # no extra formatting for "^--- /dev/null"
+       if (! $diffinfo->{'nparents'}) {
+               # ordinary (single parent) diff
+               if ($line =~ m!^--- "?a/!) {
+                       if ($from->{'href'}) {
+                               $line = '--- a/' .
+                                       $cgi->a({-href=>$from->{'href'}, -class=>"path"},
+                                               esc_path($from->{'file'}));
+                       } else {
+                               $line = '--- a/' .
+                                       esc_path($from->{'file'});
+                       }
+               }
+               $result .= qq!<div class="diff from_file">$line</div>\n!;
+
+       } else {
+               # combined diff (merge commit)
+               for (my $i = 0; $i < $diffinfo->{'nparents'}; $i++) {
+                       if ($from->{'href'}[$i]) {
+                               $line = '--- ' .
+                                       $cgi->a({-href=>href(action=>"blobdiff",
+                                                            hash_parent=>$diffinfo->{'from_id'}[$i],
+                                                            hash_parent_base=>$parents[$i],
+                                                            file_parent=>$from->{'file'}[$i],
+                                                            hash=>$diffinfo->{'to_id'},
+                                                            hash_base=>$hash,
+                                                            file_name=>$to->{'file'}),
+                                                -class=>"path",
+                                                -title=>"diff" . ($i+1)},
+                                               $i+1) .
+                                       '/' .
+                                       $cgi->a({-href=>$from->{'href'}[$i], -class=>"path"},
+                                               esc_path($from->{'file'}[$i]));
+                       } else {
+                               $line = '--- /dev/null';
+                       }
+                       $result .= qq!<div class="diff from_file">$line</div>\n!;
+               }
+       }
+
+       $line = $to_line;
+       #assert($line =~ m/^\+\+\+/) if DEBUG;
+       # no extra formatting for "^+++ /dev/null"
+       if ($line =~ m!^\+\+\+ "?b/!) {
+               if ($to->{'href'}) {
+                       $line = '+++ b/' .
+                               $cgi->a({-href=>$to->{'href'}, -class=>"path"},
+                                       esc_path($to->{'file'}));
+               } else {
+                       $line = '+++ b/' .
+                               esc_path($to->{'file'});
+               }
+       }
+       $result .= qq!<div class="diff to_file">$line</div>\n!;
+
+       return $result;
+}
+
+# create note for patch simplified by combined diff
+sub format_diff_cc_simplified {
+       my ($diffinfo, @parents) = @_;
+       my $result = '';
+
+       $result .= "<div class=\"diff header\">" .
+                  "diff --cc ";
+       if (!is_deleted($diffinfo)) {
+               $result .= $cgi->a({-href => href(action=>"blob",
+                                                 hash_base=>$hash,
+                                                 hash=>$diffinfo->{'to_id'},
+                                                 file_name=>$diffinfo->{'to_file'}),
+                                   -class => "path"},
+                                  esc_path($diffinfo->{'to_file'}));
+       } else {
+               $result .= esc_path($diffinfo->{'to_file'});
+       }
+       $result .= "</div>\n" . # class="diff header"
+                  "<div class=\"diff nodifferences\">" .
+                  "Simple merge" .
+                  "</div>\n"; # class="diff nodifferences"
+
+       return $result;
+}
+
+# format patch (diff) line (not to be used for diff headers)
 sub format_diff_line {
        my $line = shift;
        my ($from, $to) = @_;
-       my $char = substr($line, 0, 1);
        my $diff_class = "";
 
        chomp $line;
 
-       if ($char eq '+') {
-               $diff_class = " add";
-       } elsif ($char eq "-") {
-               $diff_class = " rem";
-       } elsif ($char eq "@") {
-               $diff_class = " chunk_header";
-       } elsif ($char eq "\\") {
-               $diff_class = " incomplete";
+       if ($from && $to && ref($from->{'href'}) eq "ARRAY") {
+               # combined diff
+               my $prefix = substr($line, 0, scalar @{$from->{'href'}});
+               if ($line =~ m/^\@{3}/) {
+                       $diff_class = " chunk_header";
+               } elsif ($line =~ m/^\\/) {
+                       $diff_class = " incomplete";
+               } elsif ($prefix =~ tr/+/+/) {
+                       $diff_class = " add";
+               } elsif ($prefix =~ tr/-/-/) {
+                       $diff_class = " rem";
+               }
+       } else {
+               # assume ordinary diff
+               my $char = substr($line, 0, 1);
+               if ($char eq '+') {
+                       $diff_class = " add";
+               } elsif ($char eq '-') {
+                       $diff_class = " rem";
+               } elsif ($char eq '@') {
+                       $diff_class = " chunk_header";
+               } elsif ($char eq "\\") {
+                       $diff_class = " incomplete";
+               }
        }
        $line = untabify($line);
        if ($from && $to && $line =~ m/^\@{2} /) {
@@ -932,10 +1369,80 @@ sub format_diff_line {
                $line = "<span class=\"chunk_info\">@@ $from_text $to_text @@</span>" .
                        "<span class=\"section\">" . esc_html($section, -nbsp=>1) . "</span>";
                return "<div class=\"diff$diff_class\">$line</div>\n";
+       } elsif ($from && $to && $line =~ m/^\@{3}/) {
+               my ($prefix, $ranges, $section) = $line =~ m/^(\@+) (.*?) \@+(.*)$/;
+               my (@from_text, @from_start, @from_nlines, $to_text, $to_start, $to_nlines);
+
+               @from_text = split(' ', $ranges);
+               for (my $i = 0; $i < @from_text; ++$i) {
+                       ($from_start[$i], $from_nlines[$i]) =
+                               (split(',', substr($from_text[$i], 1)), 0);
+               }
+
+               $to_text   = pop @from_text;
+               $to_start  = pop @from_start;
+               $to_nlines = pop @from_nlines;
+
+               $line = "<span class=\"chunk_info\">$prefix ";
+               for (my $i = 0; $i < @from_text; ++$i) {
+                       if ($from->{'href'}[$i]) {
+                               $line .= $cgi->a({-href=>"$from->{'href'}[$i]#l$from_start[$i]",
+                                                 -class=>"list"}, $from_text[$i]);
+                       } else {
+                               $line .= $from_text[$i];
+                       }
+                       $line .= " ";
+               }
+               if ($to->{'href'}) {
+                       $line .= $cgi->a({-href=>"$to->{'href'}#l$to_start",
+                                         -class=>"list"}, $to_text);
+               } else {
+                       $line .= $to_text;
+               }
+               $line .= " $prefix</span>" .
+                        "<span class=\"section\">" . esc_html($section, -nbsp=>1) . "</span>";
+               return "<div class=\"diff$diff_class\">$line</div>\n";
        }
        return "<div class=\"diff$diff_class\">" . esc_html($line, -nbsp=>1) . "</div>\n";
 }
 
+# Generates undef or something like "_snapshot_" or "snapshot (_tbz2_ _zip_)",
+# linked.  Pass the hash of the tree/commit to snapshot.
+sub format_snapshot_links {
+       my ($hash) = @_;
+       my @snapshot_fmts = gitweb_check_feature('snapshot');
+       @snapshot_fmts = filter_snapshot_fmts(@snapshot_fmts);
+       my $num_fmts = @snapshot_fmts;
+       if ($num_fmts > 1) {
+               # A parenthesized list of links bearing format names.
+               # e.g. "snapshot (_tar.gz_ _zip_)"
+               return "snapshot (" . join(' ', map
+                       $cgi->a({
+                               -href => href(
+                                       action=>"snapshot",
+                                       hash=>$hash,
+                                       snapshot_format=>$_
+                               )
+                       }, $known_snapshot_formats{$_}{'display'})
+               , @snapshot_fmts) . ")";
+       } elsif ($num_fmts == 1) {
+               # A single "snapshot" link whose tooltip bears the format name.
+               # i.e. "_snapshot_"
+               my ($fmt) = @snapshot_fmts;
+               return
+                       $cgi->a({
+                               -href => href(
+                                       action=>"snapshot",
+                                       hash=>$hash,
+                                       snapshot_format=>$fmt
+                               ),
+                               -title => "in format: $known_snapshot_formats{$fmt}{'display'}"
+                       }, "snapshot");
+       } else { # $num_fmts == 0
+               return undef;
+       }
+}
+
 ## ----------------------------------------------------------------------
 ## git utility subroutines, invoking git commands
 
@@ -979,20 +1486,121 @@ sub git_get_type {
        return $type;
 }
 
+# repository configuration
+our $config_file = '';
+our %config;
+
+# store multiple values for single key as anonymous array reference
+# single values stored directly in the hash, not as [ <value> ]
+sub hash_set_multi {
+       my ($hash, $key, $value) = @_;
+
+       if (!exists $hash->{$key}) {
+               $hash->{$key} = $value;
+       } elsif (!ref $hash->{$key}) {
+               $hash->{$key} = [ $hash->{$key}, $value ];
+       } else {
+               push @{$hash->{$key}}, $value;
+       }
+}
+
+# return hash of git project configuration
+# optionally limited to some section, e.g. 'gitweb'
+sub git_parse_project_config {
+       my $section_regexp = shift;
+       my %config;
+
+       local $/ = "\0";
+
+       open my $fh, "-|", git_cmd(), "config", '-z', '-l',
+               or return;
+
+       while (my $keyval = <$fh>) {
+               chomp $keyval;
+               my ($key, $value) = split(/\n/, $keyval, 2);
+
+               hash_set_multi(\%config, $key, $value)
+                       if (!defined $section_regexp || $key =~ /^(?:$section_regexp)\./o);
+       }
+       close $fh;
+
+       return %config;
+}
+
+# convert config value to boolean, 'true' or 'false'
+# no value, number > 0, 'true' and 'yes' values are true
+# rest of values are treated as false (never as error)
+sub config_to_bool {
+       my $val = shift;
+
+       # strip leading and trailing whitespace
+       $val =~ s/^\s+//;
+       $val =~ s/\s+$//;
+
+       return (!defined $val ||               # section.key
+               ($val =~ /^\d+$/ && $val) ||   # section.key = 1
+               ($val =~ /^(?:true|yes)$/i));  # section.key = true
+}
+
+# convert config value to simple decimal number
+# an optional value suffix of 'k', 'm', or 'g' will cause the value
+# to be multiplied by 1024, 1048576, or 1073741824
+sub config_to_int {
+       my $val = shift;
+
+       # strip leading and trailing whitespace
+       $val =~ s/^\s+//;
+       $val =~ s/\s+$//;
+
+       if (my ($num, $unit) = ($val =~ /^([0-9]*)([kmg])$/i)) {
+               $unit = lc($unit);
+               # unknown unit is treated as 1
+               return $num * ($unit eq 'g' ? 1073741824 :
+                              $unit eq 'm' ?    1048576 :
+                              $unit eq 'k' ?       1024 : 1);
+       }
+       return $val;
+}
+
+# convert config value to array reference, if needed
+sub config_to_multi {
+       my $val = shift;
+
+       return ref($val) ? $val : (defined($val) ? [ $val ] : []);
+}
+
 sub git_get_project_config {
        my ($key, $type) = @_;
 
+       # key sanity check
        return unless ($key);
        $key =~ s/^gitweb\.//;
        return if ($key =~ m/\W/);
 
-       my @x = (git_cmd(), 'config');
-       if (defined $type) { push @x, $type; }
-       push @x, "--get";
-       push @x, "gitweb.$key";
-       my $val = qx(@x);
-       chomp $val;
-       return ($val);
+       # type sanity check
+       if (defined $type) {
+               $type =~ s/^--//;
+               $type = undef
+                       unless ($type eq 'bool' || $type eq 'int');
+       }
+
+       # get config
+       if (!defined $config_file ||
+           $config_file ne "$git_dir/config") {
+               %config = git_parse_project_config('gitweb');
+               $config_file = "$git_dir/config";
+       }
+
+       # ensure given type
+       if (!defined $type) {
+               return $config{"gitweb.$key"};
+       } elsif ($type eq 'bool') {
+               # backward compatibility: 'git config --bool' returns true/false
+               return config_to_bool($config{"gitweb.$key"}) ? 'true' : 'false';
+       } elsif ($type eq 'int') {
+               return config_to_int($config{"gitweb.$key"});
+       }
+       return $config{"gitweb.$key"};
 }
 
 # get hash of given path at given ref
@@ -1008,6 +1616,11 @@ sub git_get_hash_by_path {
        my $line = <$fd>;
        close $fd or return undef;
 
+       if (!defined $line) {
+               # there is no tree or hash given by $path at $base
+               return undef;
+       }
+
        #'100644 blob 0fa3f3a66fb6a137f6ec2c19351ed4d807070ffa  panic.c'
        $line =~ m/^([0-9]+) (.+) ([0-9a-fA-F]{40})\t/;
        if (defined $type && $type ne $2) {
@@ -1017,23 +1630,55 @@ sub git_get_hash_by_path {
        return $3;
 }
 
+# get path of entry with given hash at given tree-ish (ref)
+# used to get 'from' filename for combined diff (merge commit) for renames
+sub git_get_path_by_hash {
+       my $base = shift || return;
+       my $hash = shift || return;
+
+       local $/ = "\0";
+
+       open my $fd, "-|", git_cmd(), "ls-tree", '-r', '-t', '-z', $base
+               or return undef;
+       while (my $line = <$fd>) {
+               chomp $line;
+
+               #'040000 tree 595596a6a9117ddba9fe379b6b012b558bac8423  gitweb'
+               #'100644 blob e02e90f0429be0d2a69b76571101f20b8f75530f  gitweb/README'
+               if ($line =~ m/(?:[0-9]+) (?:.+) $hash\t(.+)$/) {
+                       close $fd;
+                       return $1;
+               }
+       }
+       close $fd;
+       return undef;
+}
+
 ## ......................................................................
 ## git utility functions, directly accessing git repository
 
 sub git_get_project_description {
        my $path = shift;
 
-       open my $fd, "$projectroot/$path/description" or return undef;
+       $git_dir = "$projectroot/$path";
+       open my $fd, "$git_dir/description"
+               or return git_get_project_config('description');
        my $descr = <$fd>;
        close $fd;
-       chomp $descr;
+       if (defined $descr) {
+               chomp $descr;
+       }
        return $descr;
 }
 
 sub git_get_project_url_list {
        my $path = shift;
 
-       open my $fd, "$projectroot/$path/cloneurl" or return;
+       $git_dir = "$projectroot/$path";
+       open my $fd, "$git_dir/cloneurl"
+               or return wantarray ?
+               @{ config_to_multi(git_get_project_config('url')) } :
+                  config_to_multi(git_get_project_config('url'));
        my @git_project_url_list = map { chomp; $_ } <$fd>;
        close $fd;
 
@@ -1047,23 +1692,30 @@ sub git_get_projects_list {
        $filter ||= '';
        $filter =~ s/\.git$//;
 
+       my ($check_forks) = gitweb_check_feature('forks');
+
        if (-d $projects_list) {
                # search in directory
                my $dir = $projects_list . ($filter ? "/$filter" : '');
                # remove the trailing "/"
                $dir =~ s!/+$!!;
                my $pfxlen = length("$dir");
-
-               my ($check_forks) = gitweb_check_feature('forks');
+               my $pfxdepth = ($dir =~ tr!/!!);
 
                File::Find::find({
                        follow_fast => 1, # follow symbolic links
+                       follow_skip => 2, # ignore duplicates
                        dangling_symlinks => 0, # ignore dangling symlinks, silently
                        wanted => sub {
                                # skip project-list toplevel, if we get it.
                                return if (m!^[/.]$!);
                                # only directories can be git repositories
                                return unless (-d $_);
+                               # don't traverse too deep (Find is super slow on os x)
+                               if (($File::Find::name =~ tr!/!!) - $pfxdepth > $project_maxdepth) {
+                                       $File::Find::prune = 1;
+                                       return;
+                               }
 
                                my $subdir = substr($File::Find::name, $pfxlen + 1);
                                # we check related file in $projectroot
@@ -1081,7 +1733,9 @@ sub git_get_projects_list {
                # 'git%2Fgit.git Linus+Torvalds'
                # 'libs%2Fklibc%2Fklibc.git H.+Peter+Anvin'
                # 'linux%2Fhotplug%2Fudev.git Greg+Kroah-Hartman'
+               my %paths;
                open my ($fd), $projects_list or return;
+       PROJECT:
                while (my $line = <$fd>) {
                        chomp $line;
                        my ($path, $owner) = split ' ', $line;
@@ -1094,11 +1748,27 @@ sub git_get_projects_list {
                                # looking for forks;
                                my $pfx = substr($path, 0, length($filter));
                                if ($pfx ne $filter) {
-                                       next;
+                                       next PROJECT;
                                }
                                my $sfx = substr($path, length($filter));
                                if ($sfx !~ /^\/.*\.git$/) {
-                                       next;
+                                       next PROJECT;
+                               }
+                       } elsif ($check_forks) {
+                       PATH:
+                               foreach my $filter (keys %paths) {
+                                       # looking for forks;
+                                       my $pfx = substr($path, 0, length($filter));
+                                       if ($pfx ne $filter) {
+                                               next PATH;
+                                       }
+                                       my $sfx = substr($path, length($filter));
+                                       if ($sfx !~ /^\/.*\.git$/) {
+                                               next PATH;
+                                       }
+                                       # is a fork, don't include it in
+                                       # the list
+                                       next PROJECT;
                                }
                        }
                        if (check_export_ok("$projectroot/$path")) {
@@ -1106,21 +1776,22 @@ sub git_get_projects_list {
                                        path => $path,
                                        owner => to_utf8($owner),
                                };
-                               push @list, $pr
+                               push @list, $pr;
+                               (my $forks_path = $path) =~ s/\.git$//;
+                               $paths{$forks_path}++;
                        }
                }
                close $fd;
        }
-       @list = sort {$a->{'path'} cmp $b->{'path'}} @list;
        return @list;
 }
 
-sub git_get_project_owner {
-       my $project = shift;
-       my $owner;
+our $gitweb_project_owner = undef;
+sub git_get_project_list_from_file {
 
-       return undef unless $project;
+       return if (defined $gitweb_project_owner);
 
+       $gitweb_project_owner = {};
        # read from file (url-encoded):
        # 'git%2Fgit.git Linus+Torvalds'
        # 'libs%2Fklibc%2Fklibc.git H.+Peter+Anvin'
@@ -1132,15 +1803,31 @@ sub git_get_project_owner {
                        my ($pr, $ow) = split ' ', $line;
                        $pr = unescape($pr);
                        $ow = unescape($ow);
-                       if ($pr eq $project) {
-                               $owner = to_utf8($ow);
-                               last;
-                       }
+                       $gitweb_project_owner->{$pr} = to_utf8($ow);
                }
                close $fd;
        }
+}
+
+sub git_get_project_owner {
+       my $project = shift;
+       my $owner;
+
+       return undef unless $project;
+       $git_dir = "$projectroot/$project";
+
+       if (!defined $gitweb_project_owner) {
+               git_get_project_list_from_file();
+       }
+
+       if (exists $gitweb_project_owner->{$project}) {
+               $owner = $gitweb_project_owner->{$project};
+       }
+       if (!defined $owner){
+               $owner = git_get_project_config('owner');
+       }
        if (!defined $owner) {
-               $owner = get_file_owner("$projectroot/$project");
+               $owner = get_file_owner("$git_dir");
        }
 
        return $owner;
@@ -1158,11 +1845,13 @@ sub git_get_last_activity {
             'refs/heads') or return;
        my $most_recent = <$fd>;
        close $fd or return;
-       if ($most_recent =~ / (\d+) [-+][01]\d\d\d$/) {
+       if (defined $most_recent &&
+           $most_recent =~ / (\d+) [-+][01]\d\d\d$/) {
                my $timestamp = $1;
                my $age = time - $timestamp;
                return ($age, age_string($age));
        }
+       return (undef, undef);
 }
 
 sub git_get_references {
@@ -1225,7 +1914,7 @@ sub parse_date {
        $date{'mday-time'} = sprintf "%d %s %02d:%02d",
                             $mday, $months[$mon], $hour ,$min;
        $date{'iso-8601'}  = sprintf "%04d-%02d-%02dT%02d:%02d:%02dZ",
-                            1900+$year, $mon, $mday, $hour ,$min, $sec;
+                            1900+$year, 1+$mon, $mday, $hour ,$min, $sec;
 
        $tz =~ m/^([+\-][0-9][0-9])([0-9][0-9])$/;
        my $local = $epoch + ((int $1 + ($2/60)) * 3600);
@@ -1281,8 +1970,12 @@ sub parse_commit_text {
 
        pop @commit_lines; # Remove '\0'
 
+       if (! @commit_lines) {
+               return;
+       }
+
        my $header = shift @commit_lines;
-       if (!($header =~ m/^[0-9a-fA-F]{40}/)) {
+       if ($header !~ m/^[0-9a-fA-F]{40}/) {
                return;
        }
        ($co{'id'}, my @parents) = split ' ', $header;
@@ -1389,7 +2082,7 @@ sub parse_commit {
 }
 
 sub parse_commits {
-       my ($commit_id, $maxcount, $skip, $arg, $filename) = @_;
+       my ($commit_id, $maxcount, $skip, $filename, @args) = @_;
        my @cos;
 
        $maxcount ||= 1;
@@ -1399,9 +2092,10 @@ sub parse_commits {
 
        open my $fd, "-|", git_cmd(), "rev-list",
                "--header",
-               ($arg ? ($arg) : ()),
+               @args,
                ("--max-count=" . $maxcount),
                ("--skip=" . $skip),
+               @extra_options,
                $commit_id,
                "--",
                ($filename ? ($filename) : ())
@@ -1470,14 +2164,26 @@ sub parse_difftree_raw_line {
                $res{'to_mode'} = $2;
                $res{'from_id'} = $3;
                $res{'to_id'} = $4;
-               $res{'status'} = $5;
+               $res{'status'} = $res{'status_str'} = $5;
                $res{'similarity'} = $6;
                if ($res{'status'} eq 'R' || $res{'status'} eq 'C') { # renamed or copied
                        ($res{'from_file'}, $res{'to_file'}) = map { unquote($_) } split("\t", $7);
                } else {
-                       $res{'file'} = unquote($7);
+                       $res{'from_file'} = $res{'to_file'} = $res{'file'} = unquote($7);
                }
        }
+       # '::100755 100755 100755 60e79ca1b01bc8b057abe17ddab484699a7f5fdb 94067cc5f73388f33722d52ae02f44692bc07490 94067cc5f73388f33722d52ae02f44692bc07490 MR git-gui/git-gui.sh'
+       # combined diff (for merge commit)
+       elsif ($line =~ s/^(::+)((?:[0-7]{6} )+)((?:[0-9a-fA-F]{40} )+)([a-zA-Z]+)\t(.*)$//) {
+               $res{'nparents'}  = length($1);
+               $res{'from_mode'} = [ split(' ', $2) ];
+               $res{'to_mode'} = pop @{$res{'from_mode'}};
+               $res{'from_id'} = [ split(' ', $3) ];
+               $res{'to_id'} = pop @{$res{'from_id'}};
+               $res{'status_str'} = $4;
+               $res{'status'} = [ split('', $4) ];
+               $res{'to_file'} = unquote($5);
+       }
        # 'c512b523472485aef4fff9e57b229d9d243c967f'
        elsif ($line =~ m/^([0-9a-fA-F]{40})$/) {
                $res{'commit'} = $1;
@@ -1486,6 +2192,19 @@ sub parse_difftree_raw_line {
        return wantarray ? %res : \%res;
 }
 
+# wrapper: return parsed line of git-diff-tree "raw" output
+# (the argument might be raw line, or parsed info)
+sub parsed_difftree_line {
+       my $line_or_ref = shift;
+
+       if (ref($line_or_ref) eq "HASH") {
+               # pre-parsed (or generated by hand)
+               return $line_or_ref;
+       } else {
+               return parse_difftree_raw_line($line_or_ref);
+       }
+}
+
 # parse line of git-ls-tree output
 sub parse_ls_tree_line ($;%) {
        my $line = shift;
@@ -1507,6 +2226,52 @@ ($;%)
        return wantarray ? %res : \%res;
 }
 
+# generates _two_ hashes, references to which are passed as 2 and 3 argument
+sub parse_from_to_diffinfo {
+       my ($diffinfo, $from, $to, @parents) = @_;
+
+       if ($diffinfo->{'nparents'}) {
+               # combined diff
+               $from->{'file'} = [];
+               $from->{'href'} = [];
+               fill_from_file_info($diffinfo, @parents)
+                       unless exists $diffinfo->{'from_file'};
+               for (my $i = 0; $i < $diffinfo->{'nparents'}; $i++) {
+                       $from->{'file'}[$i] =
+                               defined $diffinfo->{'from_file'}[$i] ?
+                                       $diffinfo->{'from_file'}[$i] :
+                                       $diffinfo->{'to_file'};
+                       if ($diffinfo->{'status'}[$i] ne "A") { # not new (added) file
+                               $from->{'href'}[$i] = href(action=>"blob",
+                                                          hash_base=>$parents[$i],
+                                                          hash=>$diffinfo->{'from_id'}[$i],
+                                                          file_name=>$from->{'file'}[$i]);
+                       } else {
+                               $from->{'href'}[$i] = undef;
+                       }
+               }
+       } else {
+               # ordinary (not combined) diff
+               $from->{'file'} = $diffinfo->{'from_file'};
+               if ($diffinfo->{'status'} ne "A") { # not new (added) file
+                       $from->{'href'} = href(action=>"blob", hash_base=>$hash_parent,
+                                              hash=>$diffinfo->{'from_id'},
+                                              file_name=>$from->{'file'});
+               } else {
+                       delete $from->{'href'};
+               }
+       }
+
+       $to->{'file'} = $diffinfo->{'to_file'};
+       if (!is_deleted($diffinfo)) { # file exists in result
+               $to->{'href'} = href(action=>"blob", hash_base=>$hash,
+                                    hash=>$diffinfo->{'to_id'},
+                                    file_name=>$to->{'file'});
+       } else {
+               delete $to->{'href'};
+       }
+}
+
 ## ......................................................................
 ## parse to array of hashes functions
 
@@ -1527,6 +2292,7 @@ sub git_get_heads_list {
                my ($hash, $name, $title) = split(' ', $refinfo, 3);
                my ($committer, $epoch, $tz) =
                        ($committerinfo =~ /^(.*) ([0-9]+) (.*)$/);
+               $ref_item{'fullname'}  = $name;
                $name =~ s!^refs/heads/!!;
 
                $ref_item{'name'}  = $name;
@@ -1564,6 +2330,7 @@ sub git_get_tags_list {
                my ($id, $type, $name, $refid, $reftype, $title) = split(' ', $refinfo, 6);
                my ($creator, $epoch, $tz) =
                        ($creatorinfo =~ /^(.*) ([0-9]+) (.*)$/);
+               $ref_item{'fullname'} = $name;
                $name =~ s!^refs/tags/!!;
 
                $ref_item{'type'} = $type;
@@ -1742,9 +2509,17 @@ sub git_header_html {
                printf('<link rel="alternate" title="%s log RSS feed" '.
                       'href="%s" type="application/rss+xml" />'."\n",
                       esc_param($project), href(action=>"rss"));
+               printf('<link rel="alternate" title="%s log RSS feed (no merges)" '.
+                      'href="%s" type="application/rss+xml" />'."\n",
+                      esc_param($project), href(action=>"rss",
+                                                extra_options=>"--no-merges"));
                printf('<link rel="alternate" title="%s log Atom feed" '.
                       'href="%s" type="application/atom+xml" />'."\n",
                       esc_param($project), href(action=>"atom"));
+               printf('<link rel="alternate" title="%s log Atom feed (no merges)" '.
+                      'href="%s" type="application/atom+xml" />'."\n",
+                      esc_param($project), href(action=>"atom",
+                                                extra_options=>"--no-merges"));
        } else {
                printf('<link rel="alternate" title="%s projects list" '.
                       'href="%s" type="text/plain; charset=utf-8"/>'."\n",
@@ -1778,6 +2553,8 @@ sub git_header_html {
                }
                print "\n";
        }
+       print "</div>\n";
+
        my ($have_search) = gitweb_check_feature('search');
        if ((defined $project) && ($have_search)) {
                if (!defined $searchtext) {
@@ -1791,23 +2568,32 @@ sub git_header_html {
                } else {
                        $search_hash = "HEAD";
                }
+               my $action = $my_uri;
+               my ($use_pathinfo) = gitweb_check_feature('pathinfo');
+               if ($use_pathinfo) {
+                       $action .= "/$project";
+               } else {
+                       $cgi->param("p", $project);
+               }
                $cgi->param("a", "search");
                $cgi->param("h", $search_hash);
-               $cgi->param("p", $project);
-               print $cgi->startform(-method => "get", -action => $my_uri) .
+               print $cgi->startform(-method => "get", -action => $action) .
                      "<div class=\"search\">\n" .
-                     $cgi->hidden(-name => "p") . "\n" .
+                     (!$use_pathinfo && $cgi->hidden(-name => "p") . "\n") .
                      $cgi->hidden(-name => "a") . "\n" .
                      $cgi->hidden(-name => "h") . "\n" .
                      $cgi->popup_menu(-name => 'st', -default => 'commit',
-                                      -values => ['commit', 'author', 'committer', 'pickaxe']) .
+                                      -values => ['commit', 'grep', 'author', 'committer', 'pickaxe']) .
                      $cgi->sup($cgi->a({-href => href(action=>"search_help")}, "?")) .
                      " search:\n",
                      $cgi->textfield(-name => "s", -value => $searchtext) . "\n" .
+                     "<span title=\"Extended regular expression\">" .
+                     $cgi->checkbox(-name => 'sr', -value => 1, -label => 're',
+                                    -checked => $search_use_regexp) .
+                     "</span>" .
                      "</div>" .
                      $cgi->end_form() . "\n";
        }
-       print "</div>\n";
 }
 
 sub git_footer_html {
@@ -1870,16 +2656,16 @@ sub git_print_page_nav {
        my %arg = map { $_ => {action=>$_} } @navs;
        if (defined $head) {
                for (qw(commit commitdiff)) {
-                       $arg{$_}{hash} = $head;
+                       $arg{$_}{'hash'} = $head;
                }
                if ($current =~ m/^(tree | log | shortlog | commit | commitdiff | search)$/x) {
                        for (qw(shortlog log)) {
-                               $arg{$_}{hash} = $head;
+                               $arg{$_}{'hash'} = $head;
                        }
                }
        }
-       $arg{tree}{hash} = $treehead if defined $treehead;
-       $arg{tree}{hash_base} = $treebase if defined $treebase;
+       $arg{'tree'}{'hash'} = $treehead if defined $treehead;
+       $arg{'tree'}{'hash_base'} = $treebase if defined $treebase;
 
        print "<div class=\"page_nav\">\n" .
                (join " | ",
@@ -1903,7 +2689,7 @@ sub format_paging_nav {
 
        if ($page > 0) {
                $paging_nav .= " &sdot; " .
-                       $cgi->a({-href => href(action=>$action, hash=>$hash, page=>$page-1),
+                       $cgi->a({-href => href(-replay=>1, page=>$page-1),
                                 -accesskey => "p", -title => "Alt-p"}, "prev");
        } else {
                $paging_nav .= " &sdot; prev";
@@ -1911,7 +2697,7 @@ sub format_paging_nav {
 
        if ($nrevs >= (100 * ($page+1)-1)) {
                $paging_nav .= " &sdot; " .
-                       $cgi->a({-href => href(action=>$action, hash=>$hash, page=>$page+1),
+                       $cgi->a({-href => href(-replay=>1, page=>$page+1),
                                 -accesskey => "n", -title => "Alt-n"}, "next");
        } else {
                $paging_nav .= " &sdot; next";
@@ -1927,9 +2713,9 @@ sub git_print_header_div {
        my ($action, $title, $hash, $hash_base) = @_;
        my %args = ();
 
-       $args{action} = $action;
-       $args{hash} = $hash if $hash;
-       $args{hash_base} = $hash_base if $hash_base;
+       $args{'action'} = $action;
+       $args{'hash'} = $hash if $hash;
+       $args{'hash_base'} = $hash_base if $hash_base;
 
        print "<div class=\"header\">\n" .
              $cgi->a({-href => href(%args), -class => "title"},
@@ -2175,14 +2961,65 @@ sub git_print_tree_entry {
                                      "history");
                }
                print "</td>\n";
+       } else {
+               # unknown object: we can only present history for it
+               # (this includes 'commit' object, i.e. submodule support)
+               print "<td class=\"list\">" .
+                     esc_path($t->{'name'}) .
+                     "</td>\n";
+               print "<td class=\"link\">";
+               if (defined $hash_base) {
+                       print $cgi->a({-href => href(action=>"history",
+                                                    hash_base=>$hash_base,
+                                                    file_name=>"$basedir$t->{'name'}")},
+                                     "history");
+               }
+               print "</td>\n";
        }
 }
 
 ## ......................................................................
 ## functions printing large fragments of HTML
 
+# get pre-image filenames for merge (combined) diff
+sub fill_from_file_info {
+       my ($diff, @parents) = @_;
+
+       $diff->{'from_file'} = [ ];
+       $diff->{'from_file'}[$diff->{'nparents'} - 1] = undef;
+       for (my $i = 0; $i < $diff->{'nparents'}; $i++) {
+               if ($diff->{'status'}[$i] eq 'R' ||
+                   $diff->{'status'}[$i] eq 'C') {
+                       $diff->{'from_file'}[$i] =
+                               git_get_path_by_hash($parents[$i], $diff->{'from_id'}[$i]);
+               }
+       }
+
+       return $diff;
+}
+
+# is current raw difftree line of file deletion
+sub is_deleted {
+       my $diffinfo = shift;
+
+       return $diffinfo->{'status_str'} =~ /D/;
+}
+
+# does patch correspond to [previous] difftree raw line
+# $diffinfo  - hashref of parsed raw diff format
+# $patchinfo - hashref of parsed patch diff format
+#              (the same keys as in $diffinfo)
+sub is_patch_split {
+       my ($diffinfo, $patchinfo) = @_;
+
+       return defined $diffinfo && defined $patchinfo
+               && $diffinfo->{'to_file'} eq $patchinfo->{'to_file'};
+}
+
+
 sub git_difftree_body {
-       my ($difftree, $hash, $parent) = @_;
+       my ($difftree, $hash, @parents) = @_;
+       my ($parent) = $parents[0];
        my ($have_blame) = gitweb_check_feature('blame');
        print "<div class=\"list_head\">\n";
        if ($#{$difftree} > 10) {
@@ -2190,11 +3027,33 @@ sub git_difftree_body {
        }
        print "</div>\n";
 
-       print "<table class=\"diff_tree\">\n";
+       print "<table class=\"" .
+             (@parents > 1 ? "combined " : "") .
+             "diff_tree\">\n";
+
+       # header only for combined diff in 'commitdiff' view
+       my $has_header = @$difftree && @parents > 1 && $action eq 'commitdiff';
+       if ($has_header) {
+               # table header
+               print "<thead><tr>\n" .
+                      "<th></th><th></th>\n"; # filename, patchN link
+               for (my $i = 0; $i < @parents; $i++) {
+                       my $par = $parents[$i];
+                       print "<th>" .
+                             $cgi->a({-href => href(action=>"commitdiff",
+                                                    hash=>$hash, hash_parent=>$par),
+                                      -title => 'commitdiff to parent number ' .
+                                                 ($i+1) . ': ' . substr($par,0,7)},
+                                     $i+1) .
+                             "&nbsp;</th>\n";
+               }
+               print "</tr></thead>\n<tbody>\n";
+       }
+
        my $alternate = 1;
        my $patchno = 0;
        foreach my $line (@{$difftree}) {
-               my %diff = parse_difftree_raw_line($line);
+               my $diff = parsed_difftree_line($line);
 
                if ($alternate) {
                        print "<tr class=\"dark\">\n";
@@ -2203,31 +3062,120 @@ sub git_difftree_body {
                }
                $alternate ^= 1;
 
+               if (exists $diff->{'nparents'}) { # combined diff
+
+                       fill_from_file_info($diff, @parents)
+                               unless exists $diff->{'from_file'};
+
+                       if (!is_deleted($diff)) {
+                               # file exists in the result (child) commit
+                               print "<td>" .
+                                     $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
+                                                            file_name=>$diff->{'to_file'},
+                                                            hash_base=>$hash),
+                                             -class => "list"}, esc_path($diff->{'to_file'})) .
+                                     "</td>\n";
+                       } else {
+                               print "<td>" .
+                                     esc_path($diff->{'to_file'}) .
+                                     "</td>\n";
+                       }
+
+                       if ($action eq 'commitdiff') {
+                               # link to patch
+                               $patchno++;
+                               print "<td class=\"link\">" .
+                                     $cgi->a({-href => "#patch$patchno"}, "patch") .
+                                     " | " .
+                                     "</td>\n";
+                       }
+
+                       my $has_history = 0;
+                       my $not_deleted = 0;
+                       for (my $i = 0; $i < $diff->{'nparents'}; $i++) {
+                               my $hash_parent = $parents[$i];
+                               my $from_hash = $diff->{'from_id'}[$i];
+                               my $from_path = $diff->{'from_file'}[$i];
+                               my $status = $diff->{'status'}[$i];
+
+                               $has_history ||= ($status ne 'A');
+                               $not_deleted ||= ($status ne 'D');
+
+                               if ($status eq 'A') {
+                                       print "<td  class=\"link\" align=\"right\"> | </td>\n";
+                               } elsif ($status eq 'D') {
+                                       print "<td class=\"link\">" .
+                                             $cgi->a({-href => href(action=>"blob",
+                                                                    hash_base=>$hash,
+                                                                    hash=>$from_hash,
+                                                                    file_name=>$from_path)},
+                                                     "blob" . ($i+1)) .
+                                             " | </td>\n";
+                               } else {
+                                       if ($diff->{'to_id'} eq $from_hash) {
+                                               print "<td class=\"link nochange\">";
+                                       } else {
+                                               print "<td class=\"link\">";
+                                       }
+                                       print $cgi->a({-href => href(action=>"blobdiff",
+                                                                    hash=>$diff->{'to_id'},
+                                                                    hash_parent=>$from_hash,
+                                                                    hash_base=>$hash,
+                                                                    hash_parent_base=>$hash_parent,
+                                                                    file_name=>$diff->{'to_file'},
+                                                                    file_parent=>$from_path)},
+                                                     "diff" . ($i+1)) .
+                                             " | </td>\n";
+                               }
+                       }
+
+                       print "<td class=\"link\">";
+                       if ($not_deleted) {
+                               print $cgi->a({-href => href(action=>"blob",
+                                                            hash=>$diff->{'to_id'},
+                                                            file_name=>$diff->{'to_file'},
+                                                            hash_base=>$hash)},
+                                             "blob");
+                               print " | " if ($has_history);
+                       }
+                       if ($has_history) {
+                               print $cgi->a({-href => href(action=>"history",
+                                                            file_name=>$diff->{'to_file'},
+                                                            hash_base=>$hash)},
+                                             "history");
+                       }
+                       print "</td>\n";
+
+                       print "</tr>\n";
+                       next; # instead of 'else' clause, to avoid extra indent
+               }
+               # else ordinary diff
+
                my ($to_mode_oct, $to_mode_str, $to_file_type);
                my ($from_mode_oct, $from_mode_str, $from_file_type);
-               if ($diff{'to_mode'} ne ('0' x 6)) {
-                       $to_mode_oct = oct $diff{'to_mode'};
+               if ($diff->{'to_mode'} ne ('0' x 6)) {
+                       $to_mode_oct = oct $diff->{'to_mode'};
                        if (S_ISREG($to_mode_oct)) { # only for regular file
                                $to_mode_str = sprintf("%04o", $to_mode_oct & 0777); # permission bits
                        }
-                       $to_file_type = file_type($diff{'to_mode'});
+                       $to_file_type = file_type($diff->{'to_mode'});
                }
-               if ($diff{'from_mode'} ne ('0' x 6)) {
-                       $from_mode_oct = oct $diff{'from_mode'};
+               if ($diff->{'from_mode'} ne ('0' x 6)) {
+                       $from_mode_oct = oct $diff->{'from_mode'};
                        if (S_ISREG($to_mode_oct)) { # only for regular file
                                $from_mode_str = sprintf("%04o", $from_mode_oct & 0777); # permission bits
                        }
-                       $from_file_type = file_type($diff{'from_mode'});
+                       $from_file_type = file_type($diff->{'from_mode'});
                }
 
-               if ($diff{'status'} eq "A") { # created
+               if ($diff->{'status'} eq "A") { # created
                        my $mode_chng = "<span class=\"file_status new\">[new $to_file_type";
                        $mode_chng   .= " with mode: $to_mode_str" if $to_mode_str;
                        $mode_chng   .= "]</span>";
                        print "<td>";
-                       print $cgi->a({-href => href(action=>"blob", hash=>$diff{'to_id'},
-                                                    hash_base=>$hash, file_name=>$diff{'file'}),
-                                     -class => "list"}, esc_path($diff{'file'}));
+                       print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
+                                                    hash_base=>$hash, file_name=>$diff->{'file'}),
+                                     -class => "list"}, esc_path($diff->{'file'}));
                        print "</td>\n";
                        print "<td>$mode_chng</td>\n";
                        print "<td class=\"link\">";
@@ -2237,17 +3185,17 @@ sub git_difftree_body {
                                print $cgi->a({-href => "#patch$patchno"}, "patch");
                                print " | ";
                        }
-                       print $cgi->a({-href => href(action=>"blob", hash=>$diff{'to_id'},
-                                                    hash_base=>$hash, file_name=>$diff{'file'})},
+                       print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
+                                                    hash_base=>$hash, file_name=>$diff->{'file'})},
                                      "blob");
                        print "</td>\n";
 
-               } elsif ($diff{'status'} eq "D") { # deleted
+               } elsif ($diff->{'status'} eq "D") { # deleted
                        my $mode_chng = "<span class=\"file_status deleted\">[deleted $from_file_type]</span>";
                        print "<td>";
-                       print $cgi->a({-href => href(action=>"blob", hash=>$diff{'from_id'},
-                                                    hash_base=>$parent, file_name=>$diff{'file'}),
-                                      -class => "list"}, esc_path($diff{'file'}));
+                       print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'from_id'},
+                                                    hash_base=>$parent, file_name=>$diff->{'file'}),
+                                      -class => "list"}, esc_path($diff->{'file'}));
                        print "</td>\n";
                        print "<td>$mode_chng</td>\n";
                        print "<td class=\"link\">";
@@ -2257,22 +3205,22 @@ sub git_difftree_body {
                                print $cgi->a({-href => "#patch$patchno"}, "patch");
                                print " | ";
                        }
-                       print $cgi->a({-href => href(action=>"blob", hash=>$diff{'from_id'},
-                                                    hash_base=>$parent, file_name=>$diff{'file'})},
+                       print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'from_id'},
+                                                    hash_base=>$parent, file_name=>$diff->{'file'})},
                                      "blob") . " | ";
                        if ($have_blame) {
                                print $cgi->a({-href => href(action=>"blame", hash_base=>$parent,
-                                                            file_name=>$diff{'file'})},
+                                                            file_name=>$diff->{'file'})},
                                              "blame") . " | ";
                        }
                        print $cgi->a({-href => href(action=>"history", hash_base=>$parent,
-                                                    file_name=>$diff{'file'})},
+                                                    file_name=>$diff->{'file'})},
                                      "history");
                        print "</td>\n";
 
-               } elsif ($diff{'status'} eq "M" || $diff{'status'} eq "T") { # modified, or type changed
+               } elsif ($diff->{'status'} eq "M" || $diff->{'status'} eq "T") { # modified, or type changed
                        my $mode_chnge = "";
-                       if ($diff{'from_mode'} != $diff{'to_mode'}) {
+                       if ($diff->{'from_mode'} != $diff->{'to_mode'}) {
                                $mode_chnge = "<span class=\"file_status mode_chnge\">[changed";
                                if ($from_file_type ne $to_file_type) {
                                        $mode_chnge .= " from $from_file_type to $to_file_type";
@@ -2287,9 +3235,9 @@ sub git_difftree_body {
                                $mode_chnge .= "]</span>\n";
                        }
                        print "<td>";
-                       print $cgi->a({-href => href(action=>"blob", hash=>$diff{'to_id'},
-                                                    hash_base=>$hash, file_name=>$diff{'file'}),
-                                     -class => "list"}, esc_path($diff{'file'}));
+                       print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
+                                                    hash_base=>$hash, file_name=>$diff->{'file'}),
+                                     -class => "list"}, esc_path($diff->{'file'}));
                        print "</td>\n";
                        print "<td>$mode_chnge</td>\n";
                        print "<td class=\"link\">";
@@ -2298,85 +3246,90 @@ sub git_difftree_body {
                                $patchno++;
                                print $cgi->a({-href => "#patch$patchno"}, "patch") .
                                      " | ";
-                       } elsif ($diff{'to_id'} ne $diff{'from_id'}) {
+                       } elsif ($diff->{'to_id'} ne $diff->{'from_id'}) {
                                # "commit" view and modified file (not onlu mode changed)
                                print $cgi->a({-href => href(action=>"blobdiff",
-                                                            hash=>$diff{'to_id'}, hash_parent=>$diff{'from_id'},
+                                                            hash=>$diff->{'to_id'}, hash_parent=>$diff->{'from_id'},
                                                             hash_base=>$hash, hash_parent_base=>$parent,
-                                                            file_name=>$diff{'file'})},
+                                                            file_name=>$diff->{'file'})},
                                              "diff") .
                                      " | ";
                        }
-                       print $cgi->a({-href => href(action=>"blob", hash=>$diff{'to_id'},
-                                                    hash_base=>$hash, file_name=>$diff{'file'})},
+                       print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
+                                                    hash_base=>$hash, file_name=>$diff->{'file'})},
                                       "blob") . " | ";
                        if ($have_blame) {
                                print $cgi->a({-href => href(action=>"blame", hash_base=>$hash,
-                                                            file_name=>$diff{'file'})},
+                                                            file_name=>$diff->{'file'})},
                                              "blame") . " | ";
                        }
                        print $cgi->a({-href => href(action=>"history", hash_base=>$hash,
-                                                    file_name=>$diff{'file'})},
+                                                    file_name=>$diff->{'file'})},
                                      "history");
                        print "</td>\n";
 
-               } elsif ($diff{'status'} eq "R" || $diff{'status'} eq "C") { # renamed or copied
+               } elsif ($diff->{'status'} eq "R" || $diff->{'status'} eq "C") { # renamed or copied
                        my %status_name = ('R' => 'moved', 'C' => 'copied');
-                       my $nstatus = $status_name{$diff{'status'}};
+                       my $nstatus = $status_name{$diff->{'status'}};
                        my $mode_chng = "";
-                       if ($diff{'from_mode'} != $diff{'to_mode'}) {
+                       if ($diff->{'from_mode'} != $diff->{'to_mode'}) {
                                # mode also for directories, so we cannot use $to_mode_str
                                $mode_chng = sprintf(", mode: %04o", $to_mode_oct & 0777);
                        }
                        print "<td>" .
                              $cgi->a({-href => href(action=>"blob", hash_base=>$hash,
-                                                    hash=>$diff{'to_id'}, file_name=>$diff{'to_file'}),
-                                     -class => "list"}, esc_path($diff{'to_file'})) . "</td>\n" .
+                                                    hash=>$diff->{'to_id'}, file_name=>$diff->{'to_file'}),
+                                     -class => "list"}, esc_path($diff->{'to_file'})) . "</td>\n" .
                              "<td><span class=\"file_status $nstatus\">[$nstatus from " .
                              $cgi->a({-href => href(action=>"blob", hash_base=>$parent,
-                                                    hash=>$diff{'from_id'}, file_name=>$diff{'from_file'}),
-                                     -class => "list"}, esc_path($diff{'from_file'})) .
-                             " with " . (int $diff{'similarity'}) . "% similarity$mode_chng]</span></td>\n" .
+                                                    hash=>$diff->{'from_id'}, file_name=>$diff->{'from_file'}),
+                                     -class => "list"}, esc_path($diff->{'from_file'})) .
+                             " with " . (int $diff->{'similarity'}) . "% similarity$mode_chng]</span></td>\n" .
                              "<td class=\"link\">";
                        if ($action eq 'commitdiff') {
                                # link to patch
                                $patchno++;
                                print $cgi->a({-href => "#patch$patchno"}, "patch") .
                                      " | ";
-                       } elsif ($diff{'to_id'} ne $diff{'from_id'}) {
+                       } elsif ($diff->{'to_id'} ne $diff->{'from_id'}) {
                                # "commit" view and modified file (not only pure rename or copy)
                                print $cgi->a({-href => href(action=>"blobdiff",
-                                                            hash=>$diff{'to_id'}, hash_parent=>$diff{'from_id'},
+                                                            hash=>$diff->{'to_id'}, hash_parent=>$diff->{'from_id'},
                                                             hash_base=>$hash, hash_parent_base=>$parent,
-                                                            file_name=>$diff{'to_file'}, file_parent=>$diff{'from_file'})},
+                                                            file_name=>$diff->{'to_file'}, file_parent=>$diff->{'from_file'})},
                                              "diff") .
                                      " | ";
                        }
-                       print $cgi->a({-href => href(action=>"blob", hash=>$diff{'to_id'},
-                                                    hash_base=>$parent, file_name=>$diff{'to_file'})},
+                       print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
+                                                    hash_base=>$parent, file_name=>$diff->{'to_file'})},
                                      "blob") . " | ";
                        if ($have_blame) {
                                print $cgi->a({-href => href(action=>"blame", hash_base=>$hash,
-                                                            file_name=>$diff{'to_file'})},
+                                                            file_name=>$diff->{'to_file'})},
                                              "blame") . " | ";
                        }
                        print $cgi->a({-href => href(action=>"history", hash_base=>$hash,
-                                                   file_name=>$diff{'to_file'})},
+                                                   file_name=>$diff->{'to_file'})},
                                      "history");
                        print "</td>\n";
 
                } # we should not encounter Unmerged (U) or Unknown (X) status
                print "</tr>\n";
        }
+       print "</tbody>" if $has_header;
        print "</table>\n";
 }
 
 sub git_patchset_body {
-       my ($fd, $difftree, $hash, $hash_parent) = @_;
+       my ($fd, $difftree, $hash, @hash_parents) = @_;
+       my ($hash_parent) = $hash_parents[0];
 
+       my $is_combined = (@hash_parents > 1);
        my $patch_idx = 0;
+       my $patch_number = 0;
        my $patch_line;
        my $diffinfo;
+       my $to_name;
        my (%from, %to);
 
        print "<div class=\"patchset\">\n";
@@ -2390,160 +3343,92 @@ sub git_patchset_body {
 
  PATCH:
        while ($patch_line) {
-               my @diff_header;
-               my ($from_id, $to_id);
-
-               # git diff header
-               #assert($patch_line =~ m/^diff /) if DEBUG;
-               #assert($patch_line !~ m!$/$!) if DEBUG; # is chomp-ed
-               push @diff_header, $patch_line;
-
-               # extended diff header
-       EXTENDED_HEADER:
-               while ($patch_line = <$fd>) {
-                       chomp $patch_line;
-
-                       last EXTENDED_HEADER if ($patch_line =~ m/^--- |^diff /);
-
-                       if ($patch_line =~ m/^index ([0-9a-fA-F]{40})..([0-9a-fA-F]{40})/) {
-                               $from_id = $1;
-                               $to_id   = $2;
-                       }
 
-                       push @diff_header, $patch_line;
+               # parse "git diff" header line
+               if ($patch_line =~ m/^diff --git (\"(?:[^\\\"]*(?:\\.[^\\\"]*)*)\"|[^ "]*) (.*)$/) {
+                       # $1 is from_name, which we do not use
+                       $to_name = unquote($2);
+                       $to_name =~ s!^b/!!;
+               } elsif ($patch_line =~ m/^diff --(cc|combined) ("?.*"?)$/) {
+                       # $1 is 'cc' or 'combined', which we do not use
+                       $to_name = unquote($2);
+               } else {
+                       $to_name = undef;
                }
-               my $last_patch_line = $patch_line;
 
                # check if current patch belong to current raw line
                # and parse raw git-diff line if needed
-               if (defined $diffinfo &&
-                   $diffinfo->{'from_id'} eq $from_id &&
-                   $diffinfo->{'to_id'}   eq $to_id) {
-                       # this is split patch
+               if (is_patch_split($diffinfo, { 'to_file' => $to_name })) {
+                       # this is continuation of a split patch
                        print "<div class=\"patch cont\">\n";
                } else {
                        # advance raw git-diff output if needed
                        $patch_idx++ if defined $diffinfo;
 
                        # read and prepare patch information
-                       if (ref($difftree->[$patch_idx]) eq "HASH") {
-                               # pre-parsed (or generated by hand)
-                               $diffinfo = $difftree->[$patch_idx];
-                       } else {
-                               $diffinfo = parse_difftree_raw_line($difftree->[$patch_idx]);
-                       }
-                       $from{'file'} = $diffinfo->{'from_file'} || $diffinfo->{'file'};
-                       $to{'file'}   = $diffinfo->{'to_file'}   || $diffinfo->{'file'};
-                       if ($diffinfo->{'status'} ne "A") { # not new (added) file
-                               $from{'href'} = href(action=>"blob", hash_base=>$hash_parent,
-                                                    hash=>$diffinfo->{'from_id'},
-                                                    file_name=>$from{'file'});
-                       } else {
-                               delete $from{'href'};
-                       }
-                       if ($diffinfo->{'status'} ne "D") { # not deleted file
-                               $to{'href'} = href(action=>"blob", hash_base=>$hash,
-                                                  hash=>$diffinfo->{'to_id'},
-                                                  file_name=>$to{'file'});
-                       } else {
-                               delete $to{'href'};
+                       $diffinfo = parsed_difftree_line($difftree->[$patch_idx]);
+
+                       # compact combined diff output can have some patches skipped
+                       # find which patch (using pathname of result) we are at now;
+                       if ($is_combined) {
+                               while ($to_name ne $diffinfo->{'to_file'}) {
+                                       print "<div class=\"patch\" id=\"patch". ($patch_idx+1) ."\">\n" .
+                                             format_diff_cc_simplified($diffinfo, @hash_parents) .
+                                             "</div>\n";  # class="patch"
+
+                                       $patch_idx++;
+                                       $patch_number++;
+
+                                       last if $patch_idx > $#$difftree;
+                                       $diffinfo = parsed_difftree_line($difftree->[$patch_idx]);
+                               }
                        }
+
+                       # modifies %from, %to hashes
+                       parse_from_to_diffinfo($diffinfo, \%from, \%to, @hash_parents);
+
                        # this is first patch for raw difftree line with $patch_idx index
                        # we index @$difftree array from 0, but number patches from 1
                        print "<div class=\"patch\" id=\"patch". ($patch_idx+1) ."\">\n";
                }
 
+               # git diff header
+               #assert($patch_line =~ m/^diff /) if DEBUG;
+               #assert($patch_line !~ m!$/$!) if DEBUG; # is chomp-ed
+               $patch_number++;
                # print "git diff" header
-               $patch_line = shift @diff_header;
-               $patch_line =~ s!^(diff (.*?) )"?a/.*$!$1!;
-               if ($from{'href'}) {
-                       $patch_line .= $cgi->a({-href => $from{'href'}, -class => "path"},
-                                              'a/' . esc_path($from{'file'}));
-               } else { # file was added
-                       $patch_line .= 'a/' . esc_path($from{'file'});
-               }
-               $patch_line .= ' ';
-               if ($to{'href'}) {
-                       $patch_line .= $cgi->a({-href => $to{'href'}, -class => "path"},
-                                              'b/' . esc_path($to{'file'}));
-               } else { # file was deleted
-                       $patch_line .= 'b/' . esc_path($to{'file'});
-               }
-               print "<div class=\"diff header\">$patch_line</div>\n";
+               print format_git_diff_header_line($patch_line, $diffinfo,
+                                                 \%from, \%to);
 
                # print extended diff header
-               print "<div class=\"diff extended_header\">\n" if (@diff_header > 0);
+               print "<div class=\"diff extended_header\">\n";
        EXTENDED_HEADER:
-               foreach $patch_line (@diff_header) {
-                       # match <path>
-                       if ($patch_line =~ s!^((copy|rename) from ).*$!$1! && $from{'href'}) {
-                               $patch_line .= $cgi->a({-href=>$from{'href'}, -class=>"path"},
-                                                      esc_path($from{'file'}));
-                       }
-                       if ($patch_line =~ s!^((copy|rename) to ).*$!$1! && $to{'href'}) {
-                               $patch_line .= $cgi->a({-href=>$to{'href'}, -class=>"path"},
-                                                      esc_path($to{'file'}));
-                       }
-                       # match <mode>
-                       if ($patch_line =~ m/\s(\d{6})$/) {
-                               $patch_line .= '<span class="info"> (' .
-                                              file_type_long($1) .
-                                              ')</span>';
-                       }
-                       # match <hash>
-                       if ($patch_line =~ m/^index/) {
-                               my ($from_link, $to_link);
-                               if ($from{'href'}) {
-                                       $from_link = $cgi->a({-href=>$from{'href'}, -class=>"hash"},
-                                                            substr($diffinfo->{'from_id'},0,7));
-                               } else {
-                                       $from_link = '0' x 7;
-                               }
-                               if ($to{'href'}) {
-                                       $to_link = $cgi->a({-href=>$to{'href'}, -class=>"hash"},
-                                                          substr($diffinfo->{'to_id'},0,7));
-                               } else {
-                                       $to_link = '0' x 7;
-                               }
-                               #affirm {
-                               #       my ($from_hash, $to_hash) =
-                               #               ($patch_line =~ m/^index ([0-9a-fA-F]{40})..([0-9a-fA-F]{40})/);
-                               #       my ($from_id, $to_id) =
-                               #               ($diffinfo->{'from_id'}, $diffinfo->{'to_id'});
-                               #       ($from_hash eq $from_id) && ($to_hash eq $to_id);
-                               #} if DEBUG;
-                               my ($from_id, $to_id) = ($diffinfo->{'from_id'}, $diffinfo->{'to_id'});
-                               $patch_line =~ s!$from_id\.\.$to_id!$from_link..$to_link!;
-                       }
-                       print $patch_line . "<br/>\n";
+               while ($patch_line = <$fd>) {
+                       chomp $patch_line;
+
+                       last EXTENDED_HEADER if ($patch_line =~ m/^--- |^diff /);
+
+                       print format_extended_diff_header_line($patch_line, $diffinfo,
+                                                              \%from, \%to);
                }
-               print "</div>\n"  if (@diff_header > 0); # class="diff extended_header"
+               print "</div>\n"; # class="diff extended_header"
 
                # from-file/to-file diff header
-               $patch_line = $last_patch_line;
                if (! $patch_line) {
                        print "</div>\n"; # class="patch"
                        last PATCH;
                }
                next PATCH if ($patch_line =~ m/^diff /);
                #assert($patch_line =~ m/^---/) if DEBUG;
-               if ($from{'href'} && $patch_line =~ m!^--- "?a/!) {
-                       $patch_line = '--- a/' .
-                                     $cgi->a({-href=>$from{'href'}, -class=>"path"},
-                                             esc_path($from{'file'}));
-               }
-               print "<div class=\"diff from_file\">$patch_line</div>\n";
 
+               my $last_patch_line = $patch_line;
                $patch_line = <$fd>;
                chomp $patch_line;
+               #assert($patch_line =~ m/^\+\+\+/) if DEBUG;
 
-               #assert($patch_line =~ m/^+++/) if DEBUG;
-               if ($to{'href'} && $patch_line =~ m!^\+\+\+ "?b/!) {
-                       $patch_line = '+++ b/' .
-                                     $cgi->a({-href=>$to{'href'}, -class=>"path"},
-                                             esc_path($to{'file'}));
-               }
-               print "<div class=\"diff to_file\">$patch_line</div>\n";
+               print format_diff_from_to_header($last_patch_line, $patch_line,
+                                                $diffinfo, \%from, \%to,
+                                                @hash_parents);
 
                # the patch itself
        LINE:
@@ -2559,6 +3444,30 @@ sub git_patchset_body {
                print "</div>\n"; # class="patch"
        }
 
+       # for compact combined (--cc) format, with chunk and patch simpliciaction
+       # patchset might be empty, but there might be unprocessed raw lines
+       for (++$patch_idx if $patch_number > 0;
+            $patch_idx < @$difftree;
+            ++$patch_idx) {
+               # read and prepare patch information
+               $diffinfo = parsed_difftree_line($difftree->[$patch_idx]);
+
+               # generate anchor for "patch" links in difftree / whatchanged part
+               print "<div class=\"patch\" id=\"patch". ($patch_idx+1) ."\">\n" .
+                     format_diff_cc_simplified($diffinfo, @hash_parents) .
+                     "</div>\n";  # class="patch"
+
+               $patch_number++;
+       }
+
+       if ($patch_number == 0) {
+               if (@hash_parents > 1) {
+                       print "<div class=\"diff nodifferences\">Trivial merge</div>\n";
+               } else {
+                       print "<div class=\"diff nodifferences\">No differences found</div>\n";
+               }
+       }
+
        print "</div>\n"; # class="patchset"
 }
 
@@ -2579,10 +3488,10 @@ sub git_project_list_body {
                if (!defined $pr->{'descr'}) {
                        my $descr = git_get_project_description($pr->{'path'}) || "";
                        $pr->{'descr_long'} = to_utf8($descr);
-                       $pr->{'descr'} = chop_str($descr, 25, 5);
+                       $pr->{'descr'} = chop_str($descr, $projects_list_description_width, 5);
                }
                if (!defined $pr->{'owner'}) {
-                       $pr->{'owner'} = get_file_owner("$projectroot/$pr->{'path'}") || "";
+                       $pr->{'owner'} = git_get_project_owner("$pr->{'path'}") || "";
                }
                if ($check_forks) {
                        my $pname = $pr->{'path'};
@@ -2598,7 +3507,7 @@ sub git_project_list_body {
                push @projects, $pr;
        }
 
-       $order ||= "project";
+       $order ||= $default_projects_order;
        $from = 0 unless defined $from;
        $to = $#projects if (!defined $to || $#projects < $to);
 
@@ -2669,9 +3578,9 @@ sub git_project_list_body {
                      "<td>" . $cgi->a({-href => href(project=>$pr->{'path'}, action=>"summary"),
                                        -class => "list", -title => $pr->{'descr_long'}},
                                        esc_html($pr->{'descr'})) . "</td>\n" .
-                     "<td><i>" . chop_str($pr->{'owner'}, 15) . "</i></td>\n";
+                     "<td><i>" . chop_and_escape_str($pr->{'owner'}, 15) . "</i></td>\n";
                print "<td class=\"". age_class($pr->{'age'}) . "\">" .
-                     $pr->{'age_string'} . "</td>\n" .
+                     (defined $pr->{'age_string'} ? $pr->{'age_string'} : "No commits") . "</td>\n" .
                      "<td class=\"link\">" .
                      $cgi->a({-href => href(project=>$pr->{'path'}, action=>"summary")}, "summary")   . " | " .
                      $cgi->a({-href => href(project=>$pr->{'path'}, action=>"shortlog")}, "shortlog") . " | " .
@@ -2696,12 +3605,10 @@ sub git_shortlog_body {
        # uses global variable $project
        my ($commitlist, $from, $to, $refs, $extra) = @_;
 
-       my $have_snapshot = gitweb_have_snapshot();
-
        $from = 0 unless defined $from;
        $to = $#{$commitlist} if (!defined $to || $#{$commitlist} < $to);
 
-       print "<table class=\"shortlog\" cellspacing=\"0\">\n";
+       print "<table class=\"shortlog\">\n";
        my $alternate = 1;
        for (my $i = $from; $i <= $to; $i++) {
                my %co = %{$commitlist->[$i]};
@@ -2713,9 +3620,10 @@ sub git_shortlog_body {
                        print "<tr class=\"light\">\n";
                }
                $alternate ^= 1;
+               my $author = chop_and_escape_str($co{'author_name'}, 10);
                # git_summary() used print "<td><i>$co{'age_string'}</i></td>\n" .
                print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
-                     "<td><i>" . esc_html(chop_str($co{'author_name'}, 10)) . "</i></td>\n" .
+                     "<td><i>" . $author . "</i></td>\n" .
                      "<td>";
                print format_subject_html($co{'title'}, $co{'title_short'},
                                          href(action=>"commit", hash=>$commit), $ref);
@@ -2724,8 +3632,9 @@ sub git_shortlog_body {
                      $cgi->a({-href => href(action=>"commit", hash=>$commit)}, "commit") . " | " .
                      $cgi->a({-href => href(action=>"commitdiff", hash=>$commit)}, "commitdiff") . " | " .
                      $cgi->a({-href => href(action=>"tree", hash=>$commit, hash_base=>$commit)}, "tree");
-               if ($have_snapshot) {
-                       print " | " . $cgi->a({-href => href(action=>"snapshot", hash=>$commit)}, "snapshot");
+               my $snapshot_links = format_snapshot_links($commit);
+               if (defined $snapshot_links) {
+                       print " | " . $snapshot_links;
                }
                print "</td>\n" .
                      "</tr>\n";
@@ -2745,7 +3654,7 @@ sub git_history_body {
        $from = 0 unless defined $from;
        $to = $#{$commitlist} unless (defined $to && $to <= $#{$commitlist});
 
-       print "<table class=\"history\" cellspacing=\"0\">\n";
+       print "<table class=\"history\">\n";
        my $alternate = 1;
        for (my $i = $from; $i <= $to; $i++) {
                my %co = %{$commitlist->[$i]};
@@ -2762,9 +3671,10 @@ sub git_history_body {
                        print "<tr class=\"light\">\n";
                }
                $alternate ^= 1;
+       # shortlog uses      chop_str($co{'author_name'}, 10)
+               my $author = chop_and_escape_str($co{'author_name'}, 15, 3);
                print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
-                     # shortlog uses      chop_str($co{'author_name'}, 10)
-                     "<td><i>" . esc_html(chop_str($co{'author_name'}, 15, 3)) . "</i></td>\n" .
+                     "<td><i>" . $author . "</i></td>\n" .
                      "<td>";
                # originally git_history used chop_str($co{'title'}, 50)
                print format_subject_html($co{'title'}, $co{'title_short'},
@@ -2804,7 +3714,7 @@ sub git_tags_body {
        $from = 0 unless defined $from;
        $to = $#{$taglist} if (!defined $to || $#{$taglist} < $to);
 
-       print "<table class=\"tags\" cellspacing=\"0\">\n";
+       print "<table class=\"tags\">\n";
        my $alternate = 1;
        for (my $i = $from; $i <= $to; $i++) {
                my $entry = $taglist->[$i];
@@ -2845,8 +3755,8 @@ sub git_tags_body {
                      "<td class=\"link\">" . " | " .
                      $cgi->a({-href => href(action=>$tag{'reftype'}, hash=>$tag{'refid'})}, $tag{'reftype'});
                if ($tag{'reftype'} eq "commit") {
-                       print " | " . $cgi->a({-href => href(action=>"shortlog", hash=>$tag{'name'})}, "shortlog") .
-                             " | " . $cgi->a({-href => href(action=>"log", hash=>$tag{'name'})}, "log");
+                       print " | " . $cgi->a({-href => href(action=>"shortlog", hash=>$tag{'fullname'})}, "shortlog") .
+                             " | " . $cgi->a({-href => href(action=>"log", hash=>$tag{'fullname'})}, "log");
                } elsif ($tag{'reftype'} eq "blob") {
                        print " | " . $cgi->a({-href => href(action=>"blob_plain", hash=>$tag{'refid'})}, "raw");
                }
@@ -2867,7 +3777,7 @@ sub git_heads_body {
        $from = 0 unless defined $from;
        $to = $#{$headlist} if (!defined $to || $#{$headlist} < $to);
 
-       print "<table class=\"heads\" cellspacing=\"0\">\n";
+       print "<table class=\"heads\">\n";
        my $alternate = 1;
        for (my $i = $from; $i <= $to; $i++) {
                my $entry = $headlist->[$i];
@@ -2881,13 +3791,13 @@ sub git_heads_body {
                $alternate ^= 1;
                print "<td><i>$ref{'age'}</i></td>\n" .
                      ($curr ? "<td class=\"current_head\">" : "<td>") .
-                     $cgi->a({-href => href(action=>"shortlog", hash=>$ref{'name'}),
+                     $cgi->a({-href => href(action=>"shortlog", hash=>$ref{'fullname'}),
                               -class => "list name"},esc_html($ref{'name'})) .
                      "</td>\n" .
                      "<td class=\"link\">" .
-                     $cgi->a({-href => href(action=>"shortlog", hash=>$ref{'name'})}, "shortlog") . " | " .
-                     $cgi->a({-href => href(action=>"log", hash=>$ref{'name'})}, "log") . " | " .
-                     $cgi->a({-href => href(action=>"tree", hash=>$ref{'name'}, hash_base=>$ref{'name'})}, "tree") .
+                     $cgi->a({-href => href(action=>"shortlog", hash=>$ref{'fullname'})}, "shortlog") . " | " .
+                     $cgi->a({-href => href(action=>"log", hash=>$ref{'fullname'})}, "log") . " | " .
+                     $cgi->a({-href => href(action=>"tree", hash=>$ref{'fullname'}, hash_base=>$ref{'name'})}, "tree") .
                      "</td>\n" .
                      "</tr>";
        }
@@ -2904,7 +3814,7 @@ sub git_search_grep_body {
        $from = 0 unless defined $from;
        $to = $#{$commitlist} if (!defined $to || $#{$commitlist} < $to);
 
-       print "<table class=\"grep\" cellspacing=\"0\">\n";
+       print "<table class=\"commit_search\">\n";
        my $alternate = 1;
        for (my $i = $from; $i <= $to; $i++) {
                my %co = %{$commitlist->[$i]};
@@ -2918,27 +3828,36 @@ sub git_search_grep_body {
                        print "<tr class=\"light\">\n";
                }
                $alternate ^= 1;
+               my $author = chop_and_escape_str($co{'author_name'}, 15, 5);
                print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
-                     "<td><i>" . esc_html(chop_str($co{'author_name'}, 15, 5)) . "</i></td>\n" .
+                     "<td><i>" . $author . "</i></td>\n" .
                      "<td>" .
-                     $cgi->a({-href => href(action=>"commit", hash=>$co{'id'}), -class => "list subject"},
-                              esc_html(chop_str($co{'title'}, 50)) . "<br/>");
+                     $cgi->a({-href => href(action=>"commit", hash=>$co{'id'}),
+                              -class => "list subject"},
+                             chop_and_escape_str($co{'title'}, 50) . "<br/>");
                my $comment = $co{'comment'};
                foreach my $line (@$comment) {
-                       if ($line =~ m/^(.*)($searchtext)(.*)$/i) {
-                               my $lead = esc_html($1) || "";
-                               $lead = chop_str($lead, 30, 10);
-                               my $match = esc_html($2) || "";
-                               my $trail = esc_html($3) || "";
-                               $trail = chop_str($trail, 30, 10);
-                               my $text = "$lead<span class=\"match\">$match</span>$trail";
-                               print chop_str($text, 80, 5) . "<br/>\n";
+                       if ($line =~ m/^(.*)($search_regexp)(.*)$/i) {
+                               my ($lead, $match, $trail) = ($1, $2, $3);
+                               $match = chop_str($match, 70, 5, 'center');
+                               my $contextlen = int((80 - length($match))/2);
+                               $contextlen = 30 if ($contextlen > 30);
+                               $lead  = chop_str($lead,  $contextlen, 10, 'left');
+                               $trail = chop_str($trail, $contextlen, 10, 'right');
+
+                               $lead  = esc_html($lead);
+                               $match = esc_html($match);
+                               $trail = esc_html($trail);
+
+                               print "$lead<span class=\"match\">$match</span>$trail<br />";
                        }
                }
                print "</td>\n" .
                      "<td class=\"link\">" .
                      $cgi->a({-href => href(action=>"commit", hash=>$co{'id'})}, "commit") .
                      " | " .
+                     $cgi->a({-href => href(action=>"commitdiff", hash=>$co{'id'})}, "commitdiff") .
+                     " | " .
                      $cgi->a({-href => href(action=>"tree", hash=>$co{'tree'}, hash_base=>$co{'id'})}, "tree");
                print "</td>\n" .
                      "</tr>\n";
@@ -2957,7 +3876,7 @@ sub git_search_grep_body {
 
 sub git_project_list {
        my $order = $cgi->param('o');
-       if (defined $order && $order !~ m/project|descr|owner|age/) {
+       if (defined $order && $order !~ m/none|project|descr|owner|age/) {
                die_error(undef, "Unknown order parameter");
        }
 
@@ -2980,7 +3899,7 @@ sub git_project_list {
 
 sub git_forks {
        my $order = $cgi->param('o');
-       if (defined $order && $order !~ m/project|descr|owner|age/) {
+       if (defined $order && $order !~ m/none|project|descr|owner|age/) {
                die_error(undef, "Unknown order parameter");
        }
 
@@ -3006,7 +3925,7 @@ sub git_project_index {
 
        foreach my $pr (@projects) {
                if (!exists $pr->{'owner'}) {
-                       $pr->{'owner'} = get_file_owner("$projectroot/$pr->{'path'}");
+                       $pr->{'owner'} = git_get_project_owner("$pr->{'path'}");
                }
 
                my ($path, $owner) = ($pr->{'path'}, $pr->{'owner'});
@@ -3023,7 +3942,7 @@ sub git_project_index {
 sub git_summary {
        my $descr = git_get_project_description($project) || "none";
        my %co = parse_commit("HEAD");
-       my %cd = parse_date($co{'committer_epoch'}, $co{'committer_tz'});
+       my %cd = %co ? parse_date($co{'committer_epoch'}, $co{'committer_tz'}) : ();
        my $head = $co{'id'};
 
        my $owner = git_get_project_owner($project);
@@ -3044,10 +3963,13 @@ sub git_summary {
        git_print_page_nav('summary','', $head);
 
        print "<div class=\"title\">&nbsp;</div>\n";
-       print "<table cellspacing=\"0\">\n" .
+       print "<table class=\"projects_list\">\n" .
              "<tr><td>description</td><td>" . esc_html($descr) . "</td></tr>\n" .
-             "<tr><td>owner</td><td>$owner</td></tr>\n" .
-             "<tr><td>last change</td><td>$cd{'rfc2822'}</td></tr>\n";
+             "<tr><td>owner</td><td>" . esc_html($owner) . "</td></tr>\n";
+       if (defined $cd{'rfc2822'}) {
+               print "<tr><td>last change</td><td>$cd{'rfc2822'}</td></tr>\n";
+       }
+
        # use per project git URL list in $projectroot/$project/cloneurl
        # or make project git URL from git base URL and project name
        my $url_tag = "URL";
@@ -3062,19 +3984,23 @@ sub git_summary {
 
        if (-s "$projectroot/$project/README.html") {
                if (open my $fd, "$projectroot/$project/README.html") {
-                       print "<div class=\"title\">readme</div>\n";
+                       print "<div class=\"title\">readme</div>\n" .
+                             "<div class=\"readme\">\n";
                        print $_ while (<$fd>);
+                       print "\n</div>\n"; # class="readme"
                        close $fd;
                }
        }
 
        # we need to request one more than 16 (0..15) to check if
        # those 16 are all
-       my @commitlist = parse_commits($head, 17);
-       git_print_header_div('shortlog');
-       git_shortlog_body(\@commitlist, 0, 15, $refs,
-                         $#commitlist <=  15 ? undef :
-                         $cgi->a({-href => href(action=>"shortlog")}, "..."));
+       my @commitlist = $head ? parse_commits($head, 17) : ();
+       if (@commitlist) {
+               git_print_header_div('shortlog');
+               git_shortlog_body(\@commitlist, 0, 15, $refs,
+                                 $#commitlist <=  15 ? undef :
+                                 $cgi->a({-href => href(action=>"shortlog")}, "..."));
+       }
 
        if (@taglist) {
                git_print_header_div('tags');
@@ -3095,7 +4021,7 @@ sub git_summary {
                git_project_list_body(\@forklist, undef, 0, 15,
                                      $#forklist <= 15 ? undef :
                                      $cgi->a({-href => href(action=>"forks")}, "..."),
-                                     'noheader');
+                                     'noheader');
        }
 
        git_footer_html();
@@ -3106,9 +4032,14 @@ sub git_tag {
        git_header_html();
        git_print_page_nav('','', $head,undef,$head);
        my %tag = parse_tag($hash);
+
+       if (! %tag) {
+               die_error(undef, "Unknown tag object");
+       }
+
        git_print_header_div('commit', esc_html($tag{'name'}), $hash);
        print "<div class=\"title_text\">\n" .
-             "<table cellspacing=\"0\">\n" .
+             "<table class=\"object_header\">\n" .
              "<tr>\n" .
              "<td>object</td>\n" .
              "<td>" . $cgi->a({-class => "list", -href => href(action=>$tag{'type'}, hash=>$tag{'object'})},
@@ -3161,11 +4092,11 @@ sub git_blame2 {
                or die_error(undef, "Open git-blame failed");
        git_header_html();
        my $formats_nav =
-               $cgi->a({-href => href(action=>"blob", hash=>$hash, hash_base=>$hash_base, file_name=>$file_name)},
+               $cgi->a({-href => href(action=>"blob", -replay=>1)},
                        "blob") .
                " | " .
-               $cgi->a({-href => href(action=>"history", hash=>$hash, hash_base=>$hash_base, file_name=>$file_name)},
-                       "history") .
+               $cgi->a({-href => href(action=>"history", -replay=>1)},
+                       "history") .
                " | " .
                $cgi->a({-href => href(action=>"blame", file_name=>$file_name)},
                        "HEAD");
@@ -3202,7 +4133,7 @@ sub git_blame2 {
                my $rev = substr($full_rev, 0, 8);
                my $author = $meta->{'author'};
                my %date = parse_date($meta->{'author-time'},
-                                     $meta->{'author-tz'});
+                                     $meta->{'author-tz'});
                my $date = $date{'iso-tz'};
                if ($group_size) {
                        $current_color = ++$current_color % $num_colors;
@@ -3214,9 +4145,9 @@ sub git_blame2 {
                        print " rowspan=\"$group_size\"" if ($group_size > 1);
                        print ">";
                        print $cgi->a({-href => href(action=>"commit",
-                                                    hash=>$full_rev,
-                                                    file_name=>$file_name)},
-                                     esc_html($rev));
+                                                    hash=>$full_rev,
+                                                    file_name=>$file_name)},
+                                     esc_html($rev));
                        print "</td>\n";
                }
                open (my $dd, "-|", git_cmd(), "rev-parse", "$full_rev^")
@@ -3225,13 +4156,13 @@ sub git_blame2 {
                close $dd;
                chomp($parent_commit);
                my $blamed = href(action => 'blame',
-                                 file_name => $meta->{'filename'},
-                                 hash_base => $parent_commit);
+                                 file_name => $meta->{'filename'},
+                                 hash_base => $parent_commit);
                print "<td class=\"linenr\">";
                print $cgi->a({ -href => "$blamed#l$orig_lineno",
-                               -id => "l$lineno",
-                               -class => "linenr" },
-                             esc_html($lineno));
+                               -id => "l$lineno",
+                               -class => "linenr" },
+                             esc_html($lineno));
                print "</td>";
                print "<td class=\"pre\">" . esc_html($data) . "</td>\n";
                print "</tr>\n";
@@ -3428,7 +4359,7 @@ sub git_blob {
        open my $fd, "-|", git_cmd(), "cat-file", "blob", $hash
                or die_error(undef, "Couldn't cat $file_name, $hash");
        my $mimetype = blob_mimetype($fd, $file_name);
-       if ($mimetype !~ m!^(?:text/|image/(?:gif|png|jpeg)$)!) {
+       if ($mimetype !~ m!^(?:text/|image/(?:gif|png|jpeg)$)! && -B $fd) {
                close $fd;
                return git_blob_plain($mimetype);
        }
@@ -3441,18 +4372,15 @@ sub git_blob {
                if (defined $file_name) {
                        if ($have_blame) {
                                $formats_nav .=
-                                       $cgi->a({-href => href(action=>"blame", hash_base=>$hash_base,
-                                                              hash=>$hash, file_name=>$file_name)},
+                                       $cgi->a({-href => href(action=>"blame", -replay=>1)},
                                                "blame") .
                                        " | ";
                        }
                        $formats_nav .=
-                               $cgi->a({-href => href(action=>"history", hash_base=>$hash_base,
-                                                      hash=>$hash, file_name=>$file_name)},
+                               $cgi->a({-href => href(action=>"history", -replay=>1)},
                                        "history") .
                                " | " .
-                               $cgi->a({-href => href(action=>"blob_plain",
-                                                      hash=>$hash, file_name=>$file_name)},
+                               $cgi->a({-href => href(action=>"blob_plain", -replay=>1)},
                                        "raw") .
                                " | " .
                                $cgi->a({-href => href(action=>"blob",
@@ -3460,7 +4388,8 @@ sub git_blob {
                                        "HEAD");
                } else {
                        $formats_nav .=
-                               $cgi->a({-href => href(action=>"blob_plain", hash=>$hash)}, "raw");
+                               $cgi->a({-href => href(action=>"blob_plain", -replay=>1)},
+                                       "raw");
                }
                git_print_page_nav('','', $hash_base,$co{'tree'},$hash_base, $formats_nav);
                git_print_header_div('commit', esc_html($co{'title'}), $hash_base);
@@ -3471,16 +4400,7 @@ sub git_blob {
        }
        git_print_page_path($file_name, "blob", $hash_base);
        print "<div class=\"page_body\">\n";
-       if ($mimetype =~ m!^text/!) {
-               my $nr;
-               while (my $line = <$fd>) {
-                       chomp $line;
-                       $nr++;
-                       $line = untabify($line);
-                       printf "<div class=\"pre\"><a id=\"l%i\" href=\"#l%i\" class=\"linenr\">%4i</a> %s</div>\n",
-                              $nr, $nr, $nr, esc_html($line, -nbsp=>1);
-               }
-       } elsif ($mimetype =~ m!^image/!) {
+       if ($mimetype =~ m!^image/!) {
                print qq!<img type="$mimetype"!;
                if ($file_name) {
                        print qq! alt="$file_name" title="$file_name"!;
@@ -3489,6 +4409,15 @@ sub git_blob {
                      href(action=>"blob_plain", hash=>$hash,
                           hash_base=>$hash_base, file_name=>$file_name) .
                      qq!" />\n!;
+       } else {
+               my $nr;
+               while (my $line = <$fd>) {
+                       chomp $line;
+                       $nr++;
+                       $line = untabify($line);
+                       printf "<div class=\"pre\"><a id=\"l%i\" href=\"#l%i\" class=\"linenr\">%4i</a> %s</div>\n",
+                              $nr, $nr, $nr, esc_html($line, -nbsp=>1);
+               }
        }
        close $fd
                or print "Reading blob failed.\n";
@@ -3497,8 +4426,6 @@ sub git_blob {
 }
 
 sub git_tree {
-       my $have_snapshot = gitweb_have_snapshot();
-
        if (!defined $hash_base) {
                $hash_base = "HEAD";
        }
@@ -3525,18 +4452,16 @@ sub git_tree {
                my @views_nav = ();
                if (defined $file_name) {
                        push @views_nav,
-                               $cgi->a({-href => href(action=>"history", hash_base=>$hash_base,
-                                                      hash=>$hash, file_name=>$file_name)},
+                               $cgi->a({-href => href(action=>"history", -replay=>1)},
                                        "history"),
                                $cgi->a({-href => href(action=>"tree",
                                                       hash_base=>"HEAD", file_name=>$file_name)},
                                        "HEAD"),
                }
-               if ($have_snapshot) {
+               my $snapshot_links = format_snapshot_links($hash);
+               if (defined $snapshot_links) {
                        # FIXME: Should be available when we have no hash base as well.
-                       push @views_nav,
-                               $cgi->a({-href => href(action=>"snapshot", hash=>$hash)},
-                                       "snapshot");
+                       push @views_nav, $snapshot_links;
                }
                git_print_page_nav('tree','', $hash_base, undef, undef, join(' | ', @views_nav));
                git_print_header_div('commit', esc_html($co{'title'}) . $ref, $hash_base);
@@ -3554,7 +4479,7 @@ sub git_tree {
        }
        git_print_page_path($file_name, 'tree', $hash_base);
        print "<div class=\"page_body\">\n";
-       print "<table cellspacing=\"0\">\n";
+       print "<table class=\"tree\">\n";
        my $alternate = 1;
        # '..' (top directory) link if possible
        if (defined $hash_base &&
@@ -3600,34 +4525,53 @@ sub git_tree {
 }
 
 sub git_snapshot {
-       my ($ctype, $suffix, $command) = gitweb_check_feature('snapshot');
-       my $have_snapshot = (defined $ctype && defined $suffix);
-       if (!$have_snapshot) {
+       my @supported_fmts = gitweb_check_feature('snapshot');
+       @supported_fmts = filter_snapshot_fmts(@supported_fmts);
+
+       my $format = $cgi->param('sf');
+       if (!@supported_fmts) {
                die_error('403 Permission denied', "Permission denied");
        }
+       # default to first supported snapshot format
+       $format ||= $supported_fmts[0];
+       if ($format !~ m/^[a-z0-9]+$/) {
+               die_error(undef, "Invalid snapshot format parameter");
+       } elsif (!exists($known_snapshot_formats{$format})) {
+               die_error(undef, "Unknown snapshot format");
+       } elsif (!grep($_ eq $format, @supported_fmts)) {
+               die_error(undef, "Unsupported snapshot format");
+       }
 
        if (!defined $hash) {
                $hash = git_get_head_hash($project);
        }
 
-       my $filename = to_utf8(basename($project)) . "-$hash.tar.$suffix";
+       my $git_command = git_cmd_str();
+       my $name = $project;
+       $name =~ s,([^/])/*\.git$,$1,;
+       $name = basename($name);
+       my $filename = to_utf8($name);
+       $name =~ s/\047/\047\\\047\047/g;
+       my $cmd;
+       $filename .= "-$hash$known_snapshot_formats{$format}{'suffix'}";
+       $cmd = "$git_command archive " .
+               "--format=$known_snapshot_formats{$format}{'format'} " .
+               "--prefix=\'$name\'/ $hash";
+       if (exists $known_snapshot_formats{$format}{'compressor'}) {
+               $cmd .= ' | ' . join ' ', @{$known_snapshot_formats{$format}{'compressor'}};
+       }
 
        print $cgi->header(
-               -type => "application/$ctype",
+               -type => $known_snapshot_formats{$format}{'type'},
                -content_disposition => 'inline; filename="' . "$filename" . '"',
                -status => '200 OK');
 
-       my $git = git_cmd_str();
-       my $name = $project;
-       $name =~ s/\047/\047\\\047\047/g;
-       open my $fd, "-|",
-       "$git archive --format=tar --prefix=\'$name\'/ $hash | $command"
-               or die_error(undef, "Execute git-tar-tree failed");
+       open my $fd, "-|", $cmd
+               or die_error(undef, "Execute git-archive failed");
        binmode STDOUT, ':raw';
        print <$fd>;
        binmode STDOUT, ':utf8'; # as set at the beginning of gitweb.cgi
        close $fd;
-
 }
 
 sub git_log {
@@ -3682,7 +4626,7 @@ sub git_log {
        }
        if ($#commitlist >= 100) {
                print "<div class=\"page_nav\">\n";
-               print $cgi->a({-href => href(action=>"log", hash=>$hash, page=>$page+1),
+               print $cgi->a({-href => href(-replay=>1, page=>$page+1),
                               -accesskey => "n", -title => "Alt-n"}, "next");
                print "</div>\n";
        }
@@ -3730,14 +4674,13 @@ sub git_commit {
                $parent = "--root";
        }
        my @difftree;
-       if (@$parents <= 1) {
-               # difftree output is not printed for merges
-               open my $fd, "-|", git_cmd(), "diff-tree", '-r', "--no-commit-id",
-                       @diff_opts, $parent, $hash, "--"
-                               or die_error(undef, "Open git-diff-tree failed");
-               @difftree = map { chomp; $_ } <$fd>;
-               close $fd or die_error(undef, "Reading git-diff-tree failed");
-       }
+       open my $fd, "-|", git_cmd(), "diff-tree", '-r', "--no-commit-id",
+               @diff_opts,
+               (@$parents <= 1 ? $parent : '-c'),
+               $hash, "--"
+               or die_error(undef, "Open git-diff-tree failed");
+       @difftree = map { chomp; $_ } <$fd>;
+       close $fd or die_error(undef, "Reading git-diff-tree failed");
 
        # non-textual hash id's can be cached
        my $expires;
@@ -3747,8 +4690,6 @@ sub git_commit {
        my $refs = git_get_references();
        my $ref = format_ref_marker($refs, $co{'id'});
 
-       my $have_snapshot = gitweb_have_snapshot();
-
        git_header_html(undef, $expires);
        git_print_page_nav('commit', '',
                           $hash, $co{'tree'}, $hash,
@@ -3760,7 +4701,7 @@ sub git_commit {
                git_print_header_div('tree', esc_html($co{'title'}) . $ref, $co{'tree'}, $hash);
        }
        print "<div class=\"title_text\">\n" .
-             "<table cellspacing=\"0\">\n";
+             "<table class=\"object_header\">\n";
        print "<tr><td>author</td><td>" . esc_html($co{'author'}) . "</td></tr>\n".
              "<tr>" .
              "<td></td><td> $ad{'rfc2822'}";
@@ -3787,9 +4728,9 @@ sub git_commit {
              "<td class=\"link\">" .
              $cgi->a({-href => href(action=>"tree", hash=>$co{'tree'}, hash_base=>$hash)},
                      "tree");
-       if ($have_snapshot) {
-               print " | " .
-                     $cgi->a({-href => href(action=>"snapshot", hash=>$hash)}, "snapshot");
+       my $snapshot_links = format_snapshot_links($hash);
+       if (defined $snapshot_links) {
+               print " | " . $snapshot_links;
        }
        print "</td>" .
              "</tr>\n";
@@ -3815,10 +4756,7 @@ sub git_commit {
        git_print_log($co{'comment'});
        print "</div>\n";
 
-       if (@$parents <= 1) {
-               # do not output difftree/whatchanged for merges
-               git_difftree_body(\@difftree, $hash, $parent);
-       }
+       git_difftree_body(\@difftree, $hash, @$parents);
 
        git_footer_html();
 }
@@ -3920,8 +4858,8 @@ sub git_blobdiff {
                }
 
                %diffinfo = parse_difftree_raw_line($difftree[0]);
-               $file_parent ||= $diffinfo{'from_file'} || $file_name || $diffinfo{'file'};
-               $file_name   ||= $diffinfo{'to_file'}   || $diffinfo{'file'};
+               $file_parent ||= $diffinfo{'from_file'} || $file_name;
+               $file_name   ||= $diffinfo{'to_file'};
 
                $hash_parent ||= $diffinfo{'from_id'};
                $hash        ||= $diffinfo{'to_id'};
@@ -3934,7 +4872,8 @@ sub git_blobdiff {
 
                # open patch output
                open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
-                       '-p', $hash_parent_base, $hash_base,
+                       '-p', ($format eq 'html' ? "--full-index" : ()),
+                       $hash_parent_base, $hash_base,
                        "--", (defined $file_parent ? $file_parent : ()), $file_name
                        or die_error(undef, "Open git-diff-tree failed");
        }
@@ -3969,7 +4908,8 @@ sub git_blobdiff {
                }
 
                # open patch output
-               open $fd, "-|", git_cmd(), "diff", '-p', @diff_opts,
+               open $fd, "-|", git_cmd(), "diff", @diff_opts,
+                       '-p', ($format eq 'html' ? "--full-index" : ()),
                        $hash_parent, $hash, "--"
                        or die_error(undef, "Open git-diff failed");
        } else  {
@@ -3980,10 +4920,7 @@ sub git_blobdiff {
        # header
        if ($format eq 'html') {
                my $formats_nav =
-                       $cgi->a({-href => href(action=>"blobdiff_plain",
-                                              hash=>$hash, hash_parent=>$hash_parent,
-                                              hash_base=>$hash_base, hash_parent_base=>$hash_parent_base,
-                                              file_name=>$file_name, file_parent=>$file_parent)},
+                       $cgi->a({-href => href(action=>"blobdiff_plain", -replay=>1)},
                                "raw");
                git_header_html(undef, $expires);
                if (defined $hash_base && (my %co = parse_commit($hash_base))) {
@@ -4049,22 +4986,33 @@ sub git_commitdiff {
                die_error(undef, "Unknown commit object");
        }
 
-       # we need to prepare $formats_nav before any parameter munging
+       # choose format for commitdiff for merge
+       if (! defined $hash_parent && @{$co{'parents'}} > 1) {
+               $hash_parent = '--cc';
+       }
+       # we need to prepare $formats_nav before almost any parameter munging
        my $formats_nav;
        if ($format eq 'html') {
                $formats_nav =
-                       $cgi->a({-href => href(action=>"commitdiff_plain",
-                                              hash=>$hash, hash_parent=>$hash_parent)},
+                       $cgi->a({-href => href(action=>"commitdiff_plain", -replay=>1)},
                                "raw");
 
-               if (defined $hash_parent) {
+               if (defined $hash_parent &&
+                   $hash_parent ne '-c' && $hash_parent ne '--cc') {
                        # commitdiff with two commits given
                        my $hash_parent_short = $hash_parent;
                        if ($hash_parent =~ m/^[0-9a-fA-F]{40}$/) {
                                $hash_parent_short = substr($hash_parent, 0, 7);
                        }
                        $formats_nav .=
-                               ' (from: ' .
+                               ' (from';
+                       for (my $i = 0; $i < @{$co{'parents'}}; $i++) {
+                               if ($co{'parents'}[$i] eq $hash_parent) {
+                                       $formats_nav .= ' parent ' . ($i+1);
+                                       last;
+                               }
+                       }
+                       $formats_nav .= ': ' .
                                $cgi->a({-href => href(action=>"commitdiff",
                                                       hash=>$hash_parent)},
                                        esc_html($hash_parent_short)) .
@@ -4082,6 +5030,17 @@ sub git_commitdiff {
                                ')';
                } else {
                        # merge commit
+                       if ($hash_parent eq '--cc') {
+                               $formats_nav .= ' | ' .
+                                       $cgi->a({-href => href(action=>"commitdiff",
+                                                              hash=>$hash, hash_parent=>'-c')},
+                                               'combined');
+                       } else { # $hash_parent eq '-c'
+                               $formats_nav .= ' | ' .
+                                       $cgi->a({-href => href(action=>"commitdiff",
+                                                              hash=>$hash, hash_parent=>'--cc')},
+                                               'compact');
+                       }
                        $formats_nav .=
                                ' (merge: ' .
                                join(' ', map {
@@ -4093,8 +5052,11 @@ sub git_commitdiff {
                }
        }
 
-       if (!defined $hash_parent) {
-               $hash_parent = $co{'parent'} || '--root';
+       my $hash_parent_param = $hash_parent;
+       if (!defined $hash_parent_param) {
+               # --cc for multiple parents, --root for parentless
+               $hash_parent_param =
+                       @{$co{'parents'}} > 1 ? '--cc' : $co{'parent'} || '--root';
        }
 
        # read commitdiff
@@ -4103,19 +5065,19 @@ sub git_commitdiff {
        if ($format eq 'html') {
                open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
                        "--no-commit-id", "--patch-with-raw", "--full-index",
-                       $hash_parent, $hash, "--"
+                       $hash_parent_param, $hash, "--"
                        or die_error(undef, "Open git-diff-tree failed");
 
                while (my $line = <$fd>) {
                        chomp $line;
                        # empty line ends raw part of diff-tree output
                        last unless $line;
-                       push @difftree, $line;
+                       push @difftree, scalar parse_difftree_raw_line($line);
                }
 
        } elsif ($format eq 'plain') {
                open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
-                       '-p', $hash_parent, $hash, "--"
+                       '-p', $hash_parent_param, $hash, "--"
                        or die_error(undef, "Open git-diff-tree failed");
 
        } else {
@@ -4155,26 +5117,29 @@ sub git_commitdiff {
                        -expires => $expires,
                        -content_disposition => 'inline; filename="' . "$filename" . '"');
                my %ad = parse_date($co{'author_epoch'}, $co{'author_tz'});
-               print <<TEXT;
-From: $co{'author'}
-Date: $ad{'rfc2822'} ($ad{'tz_local'})
-Subject: $co{'title'}
-TEXT
+               print "From: " . to_utf8($co{'author'}) . "\n";
+               print "Date: $ad{'rfc2822'} ($ad{'tz_local'})\n";
+               print "Subject: " . to_utf8($co{'title'}) . "\n";
+
                print "X-Git-Tag: $tagname\n" if $tagname;
                print "X-Git-Url: " . $cgi->self_url() . "\n\n";
 
                foreach my $line (@{$co{'comment'}}) {
-                       print "$line\n";
+                       print to_utf8($line) . "\n";
                }
                print "---\n\n";
        }
 
        # write patch
        if ($format eq 'html') {
-               git_difftree_body(\@difftree, $hash, $hash_parent);
+               my $use_parents = !defined $hash_parent ||
+                       $hash_parent eq '-c' || $hash_parent eq '--cc';
+               git_difftree_body(\@difftree, $hash,
+                                 $use_parents ? @{$co{'parents'}} : $hash_parent);
                print "<br/>\n";
 
-               git_patchset_body($fd, \@difftree, $hash, $hash_parent);
+               git_patchset_body($fd, \@difftree, $hash,
+                                 $use_parents ? @{$co{'parents'}} : $hash_parent);
                close $fd;
                print "</div>\n"; # class="page_body"
                git_footer_html();
@@ -4214,7 +5179,7 @@ sub git_history {
                $ftype = git_get_type($hash);
        }
 
-       my @commitlist = parse_commits($hash_base, 101, (100 * $page), "--full-history", $file_name);
+       my @commitlist = parse_commits($hash_base, 101, (100 * $page), $file_name, "--full-history");
 
        my $paging_nav = '';
        if ($page > 0) {
@@ -4223,27 +5188,20 @@ sub git_history {
                                               file_name=>$file_name)},
                                "first");
                $paging_nav .= " &sdot; " .
-                       $cgi->a({-href => href(action=>"history", hash=>$hash, hash_base=>$hash_base,
-                                              file_name=>$file_name, page=>$page-1),
+                       $cgi->a({-href => href(-replay=>1, page=>$page-1),
                                 -accesskey => "p", -title => "Alt-p"}, "prev");
        } else {
                $paging_nav .= "first";
                $paging_nav .= " &sdot; prev";
        }
-       if ($#commitlist >= 100) {
-               $paging_nav .= " &sdot; " .
-                       $cgi->a({-href => href(action=>"history", hash=>$hash, hash_base=>$hash_base,
-                                              file_name=>$file_name, page=>$page+1),
-                                -accesskey => "n", -title => "Alt-n"}, "next");
-       } else {
-               $paging_nav .= " &sdot; next";
-       }
        my $next_link = '';
        if ($#commitlist >= 100) {
                $next_link =
-                       $cgi->a({-href => href(action=>"history", hash=>$hash, hash_base=>$hash_base,
-                                              file_name=>$file_name, page=>$page+1),
+                       $cgi->a({-href => href(-replay=>1, page=>$page+1),
                                 -accesskey => "n", -title => "Alt-n"}, "next");
+               $paging_nav .= " &sdot; $next_link";
+       } else {
+               $paging_nav .= " &sdot; next";
        }
 
        git_header_html();
@@ -4285,6 +5243,12 @@ sub git_search {
                        die_error('403 Permission denied', "Permission denied");
                }
        }
+       if ($searchtype eq 'grep') {
+               my ($have_grep) = gitweb_check_feature('grep');
+               if (!$have_grep) {
+                       die_error('403 Permission denied', "Permission denied");
+               }
+       }
 
        git_header_html();
 
@@ -4298,39 +5262,35 @@ sub git_search {
                        $greptype = "--committer=";
                }
                $greptype .= $searchtext;
-               my @commitlist = parse_commits($hash, 101, (100 * $page), $greptype);
+               my @commitlist = parse_commits($hash, 101, (100 * $page), undef,
+                                              $greptype, '--regexp-ignore-case',
+                                              $search_use_regexp ? '--extended-regexp' : '--fixed-strings');
 
                my $paging_nav = '';
                if ($page > 0) {
                        $paging_nav .=
                                $cgi->a({-href => href(action=>"search", hash=>$hash,
-                                                      searchtext=>$searchtext, searchtype=>$searchtype)},
-                                       "first");
+                                                      searchtext=>$searchtext,
+                                                      searchtype=>$searchtype)},
+                                       "first");
                        $paging_nav .= " &sdot; " .
-                               $cgi->a({-href => href(action=>"search", hash=>$hash,
-                                                      searchtext=>$searchtext, searchtype=>$searchtype,
-                                                      page=>$page-1),
-                                        -accesskey => "p", -title => "Alt-p"}, "prev");
+                               $cgi->a({-href => href(-replay=>1, page=>$page-1),
+                                        -accesskey => "p", -title => "Alt-p"}, "prev");
                } else {
                        $paging_nav .= "first";
                        $paging_nav .= " &sdot; prev";
                }
+               my $next_link = '';
                if ($#commitlist >= 100) {
-                       $paging_nav .= " &sdot; " .
-                               $cgi->a({-href => href(action=>"search", hash=>$hash,
-                                                      searchtext=>$searchtext, searchtype=>$searchtype,
-                                                      page=>$page+1),
-                                        -accesskey => "n", -title => "Alt-n"}, "next");
+                       $next_link =
+                               $cgi->a({-href => href(-replay=>1, page=>$page+1),
+                                        -accesskey => "n", -title => "Alt-n"}, "next");
+                       $paging_nav .= " &sdot; $next_link";
                } else {
                        $paging_nav .= " &sdot; next";
                }
-               my $next_link = '';
+
                if ($#commitlist >= 100) {
-                       $next_link =
-                               $cgi->a({-href => href(action=>"search", hash=>$hash,
-                                                      searchtext=>$searchtext, searchtype=>$searchtype,
-                                                      page=>$page+1),
-                                        -accesskey => "n", -title => "Alt-n"}, "next");
                }
 
                git_print_page_nav('','', $hash,$co{'tree'},$hash, $paging_nav);
@@ -4342,12 +5302,15 @@ sub git_search {
                git_print_page_nav('','', $hash,$co{'tree'},$hash);
                git_print_header_div('commit', esc_html($co{'title'}), $hash);
 
-               print "<table cellspacing=\"0\">\n";
+               print "<table class=\"pickaxe search\">\n";
                my $alternate = 1;
                $/ = "\n";
                my $git_command = git_cmd_str();
+               my $searchqtext = $searchtext;
+               $searchqtext =~ s/'/'\\''/;
+               my $pickaxe_flags = $search_use_regexp ? '--pickaxe-regex' : '';
                open my $fd, "-|", "$git_command rev-list $hash | " .
-                       "$git_command diff-tree -r --stdin -S\'$searchtext\'";
+                       "$git_command diff-tree -r --stdin -S\'$searchqtext\' $pickaxe_flags";
                undef %co;
                my @files;
                while (my $line = <$fd>) {
@@ -4372,12 +5335,13 @@ sub git_search {
                                                print "<tr class=\"light\">\n";
                                        }
                                        $alternate ^= 1;
+                                       my $author = chop_and_escape_str($co{'author_name'}, 15, 5);
                                        print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
-                                             "<td><i>" . esc_html(chop_str($co{'author_name'}, 15, 5)) . "</i></td>\n" .
+                                             "<td><i>" . $author . "</i></td>\n" .
                                              "<td>" .
                                              $cgi->a({-href => href(action=>"commit", hash=>$co{'id'}),
                                                      -class => "list subject"},
-                                                     esc_html(chop_str($co{'title'}, 50)) . "<br/>");
+                                                     chop_and_escape_str($co{'title'}, 50) . "<br/>");
                                        while (my $setref = shift @files) {
                                                my %set = %$setref;
                                                print $cgi->a({-href => href(action=>"blob", hash_base=>$co{'id'},
@@ -4401,6 +5365,75 @@ sub git_search {
 
                print "</table>\n";
        }
+
+       if ($searchtype eq 'grep') {
+               git_print_page_nav('','', $hash,$co{'tree'},$hash);
+               git_print_header_div('commit', esc_html($co{'title'}), $hash);
+
+               print "<table class=\"grep_search\">\n";
+               my $alternate = 1;
+               my $matches = 0;
+               $/ = "\n";
+               open my $fd, "-|", git_cmd(), 'grep', '-n',
+                       $search_use_regexp ? ('-E', '-i') : '-F',
+                       $searchtext, $co{'tree'};
+               my $lastfile = '';
+               while (my $line = <$fd>) {
+                       chomp $line;
+                       my ($file, $lno, $ltext, $binary);
+                       last if ($matches++ > 1000);
+                       if ($line =~ /^Binary file (.+) matches$/) {
+                               $file = $1;
+                               $binary = 1;
+                       } else {
+                               (undef, $file, $lno, $ltext) = split(/:/, $line, 4);
+                       }
+                       if ($file ne $lastfile) {
+                               $lastfile and print "</td></tr>\n";
+                               if ($alternate++) {
+                                       print "<tr class=\"dark\">\n";
+                               } else {
+                                       print "<tr class=\"light\">\n";
+                               }
+                               print "<td class=\"list\">".
+                                       $cgi->a({-href => href(action=>"blob", hash=>$co{'hash'},
+                                                              file_name=>"$file"),
+                                               -class => "list"}, esc_path($file));
+                               print "</td><td>\n";
+                               $lastfile = $file;
+                       }
+                       if ($binary) {
+                               print "<div class=\"binary\">Binary file</div>\n";
+                       } else {
+                               $ltext = untabify($ltext);
+                               if ($ltext =~ m/^(.*)($search_regexp)(.*)$/i) {
+                                       $ltext = esc_html($1, -nbsp=>1);
+                                       $ltext .= '<span class="match">';
+                                       $ltext .= esc_html($2, -nbsp=>1);
+                                       $ltext .= '</span>';
+                                       $ltext .= esc_html($3, -nbsp=>1);
+                               } else {
+                                       $ltext = esc_html($ltext, -nbsp=>1);
+                               }
+                               print "<div class=\"pre\">" .
+                                       $cgi->a({-href => href(action=>"blob", hash=>$co{'hash'},
+                                                              file_name=>"$file").'#l'.$lno,
+                                               -class => "linenr"}, sprintf('%4i', $lno))
+                                       . ' ' .  $ltext . "</div>\n";
+                       }
+               }
+               if ($lastfile) {
+                       print "</td></tr>\n";
+                       if ($matches > 1000) {
+                               print "<div class=\"diff nodifferences\">Too many matches, listing trimmed</div>\n";
+                       }
+               } else {
+                       print "<div class=\"diff nodifferences\">No matches found</div>\n";
+               }
+               close $fd;
+
+               print "</table>\n";
+       }
        git_footer_html();
 }
 
@@ -4408,13 +5441,31 @@ sub git_search_help {
        git_header_html();
        git_print_page_nav('','', $hash,$hash,$hash);
        print <<EOT;
+<p><strong>Pattern</strong> is by default a normal string that is matched precisely (but without
+regard to case, except in the case of pickaxe). However, when you check the <em>re</em> checkbox,
+the pattern entered is recognized as the POSIX extended
+<a href="http://en.wikipedia.org/wiki/Regular_expression">regular expression</a> (also case
+insensitive).</p>
 <dl>
 <dt><b>commit</b></dt>
-<dd>The commit messages and authorship information will be scanned for the given string.</dd>
+<dd>The commit messages and authorship information will be scanned for the given pattern.</dd>
+EOT
+       my ($have_grep) = gitweb_check_feature('grep');
+       if ($have_grep) {
+               print <<EOT;
+<dt><b>grep</b></dt>
+<dd>All files in the currently selected tree (HEAD unless you are explicitly browsing
+    a different one) are searched for the given pattern. On large trees, this search can take
+a while and put some strain on the server, so please use it with some consideration. Note that
+due to git-grep peculiarity, currently if regexp mode is turned off, the matches are
+case-sensitive.</dd>
+EOT
+       }
+       print <<EOT;
 <dt><b>author</b></dt>
-<dd>Name and e-mail of the change author and date of birth of the patch will be scanned for the given string.</dd>
+<dd>Name and e-mail of the change author and date of birth of the patch will be scanned for the given pattern.</dd>
 <dt><b>committer</b></dt>
-<dd>Name and e-mail of the committer and date of commit will be scanned for the given string.</dd>
+<dd>Name and e-mail of the committer and date of commit will be scanned for the given pattern.</dd>
 EOT
        my ($have_pickaxe) = gitweb_check_feature('pickaxe');
        if ($have_pickaxe) {
@@ -4422,7 +5473,8 @@ sub git_search_help {
 <dt><b>pickaxe</b></dt>
 <dd>All commits that caused the string to appear or disappear from any file (changes that
 added, removed or "modified" the string) will be listed. This search can take a while and
-takes a lot of strain on the server, so please use it wisely.</dd>
+takes a lot of strain on the server, so please use it wisely. Note that since you may be
+interested even in changes just changing the case as well, this search is case sensitive.</dd>
 EOT
        }
        print "</dl>\n";
@@ -4445,7 +5497,7 @@ sub git_shortlog {
        my $next_link = '';
        if ($#commitlist >= 100) {
                $next_link =
-                       $cgi->a({-href => href(action=>"shortlog", hash=>$hash, page=>$page+1),
+                       $cgi->a({-href => href(-replay=>1, page=>$page+1),
                                 -accesskey => "n", -title => "Alt-n"}, "next");
        }
 
@@ -4473,7 +5525,7 @@ sub git_feed {
 
        # log/feed of current (HEAD) branch, log of given branch, history of file/directory
        my $head = $hash || 'HEAD';
-       my @commitlist = parse_commits($head, 150);
+       my @commitlist = parse_commits($head, 150, 0, $file_name);
 
        my %latest_commit;
        my %latest_date;
@@ -4585,14 +5637,15 @@ sub git_feed {
 
                # get list of changed files
                open my $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
-                       $co{'parent'}, $co{'id'}, "--", (defined $file_name ? $file_name : ())
+                       $co{'parent'} || "--root",
+                       $co{'id'}, "--", (defined $file_name ? $file_name : ())
                        or next;
                my @difftree = map { chomp; $_ } <$fd>;
                close $fd
                        or next;
 
                # print element (entry, item)
-               my $co_url = href(-full=>1, action=>"commit", hash=>$commit);
+               my $co_url = href(-full=>1, action=>"commitdiff", hash=>$commit);
                if ($format eq 'rss') {
                        print "<item>\n" .
                              "<title>" . esc_html($co{'title'}) . "</title>\n" .