Merge branch 'maint'
[gitweb.git] / gitweb / gitweb.perl
index f1ab5725c02a183f21c85e8537b597643758a1b3..06da30c50186eaaaba59dde91b8b8a34f6b89840 100755 (executable)
@@ -29,7 +29,9 @@ BEGIN
 
 # if we're called with PATH_INFO, we have to strip that
 # from the URL to find our real URL
-if (my $path_info = $ENV{"PATH_INFO"}) {
+# we make $path_info global because it's also used later on
+our $path_info = $ENV{"PATH_INFO"};
+if ($path_info) {
        $my_url =~ s,\Q$path_info\E$,,;
        $my_uri =~ s,\Q$path_info\E$,,;
 }
@@ -93,6 +95,11 @@ BEGIN
 # (only effective if this variable evaluates to true)
 our $export_ok = "++GITWEB_EXPORT_OK++";
 
+# show repository only if this subroutine returns true
+# when given the path to the project, for example:
+#    sub { return -e "$_[0]/git-daemon-export-ok"; }
+our $export_auth_hook = undef;
+
 # only allow viewing of repositories also shown on the overview page
 our $strict_export = "++GITWEB_STRICT_EXPORT++";
 
@@ -282,6 +289,44 @@ BEGIN
        'forks' => {
                'override' => 0,
                'default' => [0]},
+
+       # Insert custom links to the action bar of all project pages.
+       # This enables you mainly to link to third-party scripts integrating
+       # into gitweb; e.g. git-browser for graphical history representation
+       # or custom web-based repository administration interface.
+
+       # The 'default' value consists of a list of triplets in the form
+       # (label, link, position) where position is the label after which
+       # to inster the link and link is a format string where %n expands
+       # to the project name, %f to the project path within the filesystem,
+       # %h to the current hash (h gitweb parameter) and %b to the current
+       # hash base (hb gitweb parameter).
+
+       # To enable system wide have in $GITWEB_CONFIG e.g.
+       # $feature{'actions'}{'default'} = [('graphiclog',
+       #       '/git-browser/by-commit.html?r=%n', 'summary')];
+       # Project specific override is not supported.
+       'actions' => {
+               'override' => 0,
+               'default' => []},
+
+       # Allow gitweb scan project content tags described in ctags/
+       # of project repository, and display the popular Web 2.0-ish
+       # "tag cloud" near the project list. Note that this is something
+       # COMPLETELY different from the normal Git tags.
+
+       # gitweb by itself can show existing tags, but it does not handle
+       # tagging itself; you need an external application for that.
+       # For an example script, check Girocco's cgi/tagproj.cgi.
+       # You may want to install the HTML::TagCloud Perl module to get
+       # a pretty tag cloud instead of just a list of tags.
+
+       # To enable system wide have in $GITWEB_CONFIG
+       # $feature{'ctags'}{'default'} = ['path_to_tag_script'];
+       # Project specific override is not supported.
+       'ctags' => {
+               'override' => 0,
+               'default' => [0]},
 );
 
 sub gitweb_check_feature {
@@ -360,7 +405,8 @@ sub check_head_link {
 sub check_export_ok {
        my ($dir) = @_;
        return (check_head_link($dir) &&
-               (!$export_ok || -e "$dir/$export_ok"));
+               (!$export_ok || -e "$dir/$export_ok") &&
+               (!$export_auth_hook || $export_auth_hook->($dir)));
 }
 
 # process alternate names for backward compatibility
@@ -390,34 +436,219 @@ sub filter_snapshot_fmts {
 
 # ======================================================================
 # input validation and dispatch
-our $action = $cgi->param('a');
+
+# input parameters can be collected from a variety of sources (presently, CGI
+# and PATH_INFO), so we define an %input_params hash that collects them all
+# together during validation: this allows subsequent uses (e.g. href()) to be
+# agnostic of the parameter origin
+
+our %input_params = ();
+
+# input parameters are stored with the long parameter name as key. This will
+# also be used in the href subroutine to convert parameters to their CGI
+# equivalent, and since the href() usage is the most frequent one, we store
+# the name -> CGI key mapping here, instead of the reverse.
+#
+# XXX: Warning: If you touch this, check the search form for updating,
+# too.
+
+our @cgi_param_mapping = (
+       project => "p",
+       action => "a",
+       file_name => "f",
+       file_parent => "fp",
+       hash => "h",
+       hash_parent => "hp",
+       hash_base => "hb",
+       hash_parent_base => "hpb",
+       page => "pg",
+       order => "o",
+       searchtext => "s",
+       searchtype => "st",
+       snapshot_format => "sf",
+       extra_options => "opt",
+       search_use_regexp => "sr",
+);
+our %cgi_param_mapping = @cgi_param_mapping;
+
+# we will also need to know the possible actions, for validation
+our %actions = (
+       "blame" => \&git_blame,
+       "blobdiff" => \&git_blobdiff,
+       "blobdiff_plain" => \&git_blobdiff_plain,
+       "blob" => \&git_blob,
+       "blob_plain" => \&git_blob_plain,
+       "commitdiff" => \&git_commitdiff,
+       "commitdiff_plain" => \&git_commitdiff_plain,
+       "commit" => \&git_commit,
+       "forks" => \&git_forks,
+       "heads" => \&git_heads,
+       "history" => \&git_history,
+       "log" => \&git_log,
+       "rss" => \&git_rss,
+       "atom" => \&git_atom,
+       "search" => \&git_search,
+       "search_help" => \&git_search_help,
+       "shortlog" => \&git_shortlog,
+       "summary" => \&git_summary,
+       "tag" => \&git_tag,
+       "tags" => \&git_tags,
+       "tree" => \&git_tree,
+       "snapshot" => \&git_snapshot,
+       "object" => \&git_object,
+       # those below don't need $project
+       "opml" => \&git_opml,
+       "project_list" => \&git_project_list,
+       "project_index" => \&git_project_index,
+);
+
+# finally, we have the hash of allowed extra_options for the commands that
+# allow them
+our %allowed_options = (
+       "--no-merges" => [ qw(rss atom log shortlog history) ],
+);
+
+# fill %input_params with the CGI parameters. All values except for 'opt'
+# should be single values, but opt can be an array. We should probably
+# build an array of parameters that can be multi-valued, but since for the time
+# being it's only this one, we just single it out
+while (my ($name, $symbol) = each %cgi_param_mapping) {
+       if ($symbol eq 'opt') {
+               $input_params{$name} = [ $cgi->param($symbol) ];
+       } else {
+               $input_params{$name} = $cgi->param($symbol);
+       }
+}
+
+# now read PATH_INFO and update the parameter list for missing parameters
+sub evaluate_path_info {
+       return if defined $input_params{'project'};
+       return if !$path_info;
+       $path_info =~ s,^/+,,;
+       return if !$path_info;
+
+       # find which part of PATH_INFO is project
+       my $project = $path_info;
+       $project =~ s,/+$,,;
+       while ($project && !check_head_link("$projectroot/$project")) {
+               $project =~ s,/*[^/]*$,,;
+       }
+       return unless $project;
+       $input_params{'project'} = $project;
+
+       # do not change any parameters if an action is given using the query string
+       return if $input_params{'action'};
+       $path_info =~ s,^\Q$project\E/*,,;
+
+       # next, check if we have an action
+       my $action = $path_info;
+       $action =~ s,/.*$,,;
+       if (exists $actions{$action}) {
+               $path_info =~ s,^$action/*,,;
+               $input_params{'action'} = $action;
+       }
+
+       # list of actions that want hash_base instead of hash, but can have no
+       # pathname (f) parameter
+       my @wants_base = (
+               'tree',
+               'history',
+       );
+
+       # we want to catch
+       # [$hash_parent_base[:$file_parent]..]$hash_parent[:$file_name]
+       my ($parentrefname, $parentpathname, $refname, $pathname) =
+               ($path_info =~ /^(?:(.+?)(?::(.+))?\.\.)?(.+?)(?::(.+))?$/);
+
+       # first, analyze the 'current' part
+       if (defined $pathname) {
+               # we got "branch:filename" or "branch:dir/"
+               # we could use git_get_type(branch:pathname), but:
+               # - it needs $git_dir
+               # - it does a git() call
+               # - the convention of terminating directories with a slash
+               #   makes it superfluous
+               # - embedding the action in the PATH_INFO would make it even
+               #   more superfluous
+               $pathname =~ s,^/+,,;
+               if (!$pathname || substr($pathname, -1) eq "/") {
+                       $input_params{'action'} ||= "tree";
+                       $pathname =~ s,/$,,;
+               } else {
+                       # the default action depends on whether we had parent info
+                       # or not
+                       if ($parentrefname) {
+                               $input_params{'action'} ||= "blobdiff_plain";
+                       } else {
+                               $input_params{'action'} ||= "blob_plain";
+                       }
+               }
+               $input_params{'hash_base'} ||= $refname;
+               $input_params{'file_name'} ||= $pathname;
+       } elsif (defined $refname) {
+               # we got "branch". In this case we have to choose if we have to
+               # set hash or hash_base.
+               #
+               # Most of the actions without a pathname only want hash to be
+               # set, except for the ones specified in @wants_base that want
+               # hash_base instead. It should also be noted that hand-crafted
+               # links having 'history' as an action and no pathname or hash
+               # set will fail, but that happens regardless of PATH_INFO.
+               $input_params{'action'} ||= "shortlog";
+               if (grep { $_ eq $input_params{'action'} } @wants_base) {
+                       $input_params{'hash_base'} ||= $refname;
+               } else {
+                       $input_params{'hash'} ||= $refname;
+               }
+       }
+
+       # next, handle the 'parent' part, if present
+       if (defined $parentrefname) {
+               # a missing pathspec defaults to the 'current' filename, allowing e.g.
+               # someproject/blobdiff/oldrev..newrev:/filename
+               if ($parentpathname) {
+                       $parentpathname =~ s,^/+,,;
+                       $parentpathname =~ s,/$,,;
+                       $input_params{'file_parent'} ||= $parentpathname;
+               } else {
+                       $input_params{'file_parent'} ||= $input_params{'file_name'};
+               }
+               # we assume that hash_parent_base is wanted if a path was specified,
+               # or if the action wants hash_base instead of hash
+               if (defined $input_params{'file_parent'} ||
+                       grep { $_ eq $input_params{'action'} } @wants_base) {
+                       $input_params{'hash_parent_base'} ||= $parentrefname;
+               } else {
+                       $input_params{'hash_parent'} ||= $parentrefname;
+               }
+       }
+}
+evaluate_path_info();
+
+our $action = $input_params{'action'};
 if (defined $action) {
-       if ($action =~ m/[^0-9a-zA-Z\.\-_]/) {
+       if (!validate_action($action)) {
                die_error(400, "Invalid action parameter");
        }
 }
 
 # parameters which are pathnames
-our $project = $cgi->param('p');
+our $project = $input_params{'project'};
 if (defined $project) {
-       if (!validate_pathname($project) ||
-           !(-d "$projectroot/$project") ||
-           !check_head_link("$projectroot/$project") ||
-           ($export_ok && !(-e "$projectroot/$project/$export_ok")) ||
-           ($strict_export && !project_in_list($project))) {
+       if (!validate_project($project)) {
                undef $project;
                die_error(404, "No such project");
        }
 }
 
-our $file_name = $cgi->param('f');
+our $file_name = $input_params{'file_name'};
 if (defined $file_name) {
        if (!validate_pathname($file_name)) {
                die_error(400, "Invalid file parameter");
        }
 }
 
-our $file_parent = $cgi->param('fp');
+our $file_parent = $input_params{'file_parent'};
 if (defined $file_parent) {
        if (!validate_pathname($file_parent)) {
                die_error(400, "Invalid file parent parameter");
@@ -425,44 +656,41 @@ sub filter_snapshot_fmts {
 }
 
 # parameters which are refnames
-our $hash = $cgi->param('h');
+our $hash = $input_params{'hash'};
 if (defined $hash) {
        if (!validate_refname($hash)) {
                die_error(400, "Invalid hash parameter");
        }
 }
 
-our $hash_parent = $cgi->param('hp');
+our $hash_parent = $input_params{'hash_parent'};
 if (defined $hash_parent) {
        if (!validate_refname($hash_parent)) {
                die_error(400, "Invalid hash parent parameter");
        }
 }
 
-our $hash_base = $cgi->param('hb');
+our $hash_base = $input_params{'hash_base'};
 if (defined $hash_base) {
        if (!validate_refname($hash_base)) {
                die_error(400, "Invalid hash base parameter");
        }
 }
 
-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(400, "Invalid option parameter");
-               }
-               if (not grep(/^$action$/, @{$allowed_options{$opt}})) {
-                       die_error(400, "Invalid option parameter for this action");
-               }
+our @extra_options = @{$input_params{'extra_options'}};
+# @extra_options is always defined, since it can only be (currently) set from
+# CGI, and $cgi->param() returns the empty array in array context if the param
+# is not set
+foreach my $opt (@extra_options) {
+       if (not exists $allowed_options{$opt}) {
+               die_error(400, "Invalid option parameter");
+       }
+       if (not grep(/^$action$/, @{$allowed_options{$opt}})) {
+               die_error(400, "Invalid option parameter for this action");
        }
 }
 
-our $hash_parent_base = $cgi->param('hpb');
+our $hash_parent_base = $input_params{'hash_parent_base'};
 if (defined $hash_parent_base) {
        if (!validate_refname($hash_parent_base)) {
                die_error(400, "Invalid hash parent base parameter");
@@ -470,23 +698,23 @@ sub filter_snapshot_fmts {
 }
 
 # other parameters
-our $page = $cgi->param('pg');
+our $page = $input_params{'page'};
 if (defined $page) {
        if ($page =~ m/[^0-9]/) {
                die_error(400, "Invalid page parameter");
        }
 }
 
-our $searchtype = $cgi->param('st');
+our $searchtype = $input_params{'searchtype'};
 if (defined $searchtype) {
        if ($searchtype =~ m/[^a-z]/) {
                die_error(400, "Invalid searchtype parameter");
        }
 }
 
-our $search_use_regexp = $cgi->param('sr');
+our $search_use_regexp = $input_params{'search_use_regexp'};
 
-our $searchtext = $cgi->param('s');
+our $searchtext = $input_params{'searchtext'};
 our $search_regexp;
 if (defined $searchtext) {
        if (length($searchtext) < 2) {
@@ -495,86 +723,11 @@ sub filter_snapshot_fmts {
        $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;
-       my $path_info = $ENV{"PATH_INFO"};
-       return if !$path_info;
-       $path_info =~ s,^/+,,;
-       return if !$path_info;
-       # find which part of PATH_INFO is project
-       $project = $path_info;
-       $project =~ s,/+$,,;
-       while ($project && !check_head_link("$projectroot/$project")) {
-               $project =~ s,/*[^/]*$,,;
-       }
-       # validate project
-       $project = validate_pathname($project);
-       if (!$project ||
-           ($export_ok && !-e "$projectroot/$project/$export_ok") ||
-           ($strict_export && !project_in_list($project))) {
-               undef $project;
-               return;
-       }
-       # do not change any parameters if an action is given using the query string
-       return if $action;
-       $path_info =~ s,^\Q$project\E/*,,;
-       my ($refname, $pathname) = split(/:/, $path_info, 2);
-       if (defined $pathname) {
-               # we got "project.git/branch:filename" or "project.git/branch:dir/"
-               # we could use git_get_type(branch:pathname), but it needs $git_dir
-               $pathname =~ s,^/+,,;
-               if (!$pathname || substr($pathname, -1) eq "/") {
-                       $action  ||= "tree";
-                       $pathname =~ s,/$,,;
-               } else {
-                       $action  ||= "blob_plain";
-               }
-               $hash_base ||= validate_refname($refname);
-               $file_name ||= validate_pathname($pathname);
-       } elsif (defined $refname) {
-               # we got "project.git/branch"
-               $action ||= "shortlog";
-               $hash   ||= validate_refname($refname);
-       }
-}
-evaluate_path_info();
-
 # path to the current git repository
 our $git_dir;
 $git_dir = "$projectroot/$project" if $project;
 
 # dispatch
-my %actions = (
-       "blame" => \&git_blame,
-       "blobdiff" => \&git_blobdiff,
-       "blobdiff_plain" => \&git_blobdiff_plain,
-       "blob" => \&git_blob,
-       "blob_plain" => \&git_blob_plain,
-       "commitdiff" => \&git_commitdiff,
-       "commitdiff_plain" => \&git_commitdiff_plain,
-       "commit" => \&git_commit,
-       "forks" => \&git_forks,
-       "heads" => \&git_heads,
-       "history" => \&git_history,
-       "log" => \&git_log,
-       "rss" => \&git_rss,
-       "atom" => \&git_atom,
-       "search" => \&git_search,
-       "search_help" => \&git_search_help,
-       "shortlog" => \&git_shortlog,
-       "summary" => \&git_summary,
-       "tag" => \&git_tag,
-       "tags" => \&git_tags,
-       "tree" => \&git_tree,
-       "snapshot" => \&git_snapshot,
-       "object" => \&git_object,
-       # those below don't need $project
-       "opml" => \&git_opml,
-       "project_list" => \&git_project_list,
-       "project_index" => \&git_project_index,
-);
-
 if (!defined $action) {
        if (defined $hash) {
                $action = git_get_type($hash);
@@ -604,55 +757,79 @@ (%)
        # default is to use -absolute url() i.e. $my_uri
        my $href = $params{-full} ? $my_url : $my_uri;
 
-       # XXX: Warning: If you touch this, check the search form for updating,
-       # too.
-
-       my @mapping = (
-               project => "p",
-               action => "a",
-               file_name => "f",
-               file_parent => "fp",
-               hash => "h",
-               hash_parent => "hp",
-               hash_base => "hb",
-               hash_parent_base => "hpb",
-               page => "pg",
-               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, $symbol) = each %mapping) {
+               while (my ($name, $symbol) = each %cgi_param_mapping) {
                        if (!exists $params{$name}) {
-                               # to allow for multivalued params we use arrayref form
-                               $params{$name} = [ $cgi->param($symbol) ];
+                               $params{$name} = $input_params{$name};
                        }
                }
        }
 
        my ($use_pathinfo) = gitweb_check_feature('pathinfo');
        if ($use_pathinfo) {
-               # use PATH_INFO for project name
+               # try to put as many parameters as possible in PATH_INFO:
+               #   - project name
+               #   - action
+               #   - hash_parent or hash_parent_base:/file_parent
+               #   - hash or hash_base:/filename
+
+               # When the script is the root DirectoryIndex for the domain,
+               # $href here would be something like http://gitweb.example.com/
+               # Thus, we strip any trailing / from $href, to spare us double
+               # slashes in the final URL
+               $href =~ s,/$,,;
+
+               # Then add the project name, if present
                $href .= "/".esc_url($params{'project'}) if defined $params{'project'};
                delete $params{'project'};
 
-               # Summary just uses the project path URL
-               if (defined $params{'action'} && $params{'action'} eq 'summary') {
+               # Summary just uses the project path URL, any other action is
+               # added to the URL
+               if (defined $params{'action'}) {
+                       $href .= "/".esc_url($params{'action'}) unless $params{'action'} eq 'summary';
                        delete $params{'action'};
                }
+
+               # Next, we put hash_parent_base:/file_parent..hash_base:/file_name,
+               # stripping nonexistent or useless pieces
+               $href .= "/" if ($params{'hash_base'} || $params{'hash_parent_base'}
+                       || $params{'hash_parent'} || $params{'hash'});
+               if (defined $params{'hash_base'}) {
+                       if (defined $params{'hash_parent_base'}) {
+                               $href .= esc_url($params{'hash_parent_base'});
+                               # skip the file_parent if it's the same as the file_name
+                               delete $params{'file_parent'} if $params{'file_parent'} eq $params{'file_name'};
+                               if (defined $params{'file_parent'} && $params{'file_parent'} !~ /\.\./) {
+                                       $href .= ":/".esc_url($params{'file_parent'});
+                                       delete $params{'file_parent'};
+                               }
+                               $href .= "..";
+                               delete $params{'hash_parent'};
+                               delete $params{'hash_parent_base'};
+                       } elsif (defined $params{'hash_parent'}) {
+                               $href .= esc_url($params{'hash_parent'}). "..";
+                               delete $params{'hash_parent'};
+                       }
+
+                       $href .= esc_url($params{'hash_base'});
+                       if (defined $params{'file_name'} && $params{'file_name'} !~ /\.\./) {
+                               $href .= ":/".esc_url($params{'file_name'});
+                               delete $params{'file_name'};
+                       }
+                       delete $params{'hash'};
+                       delete $params{'hash_base'};
+               } elsif (defined $params{'hash'}) {
+                       $href .= esc_url($params{'hash'});
+                       delete $params{'hash'};
+               }
        }
 
        # now encode the parameters explicitly
        my @result = ();
-       for (my $i = 0; $i < @mapping; $i += 2) {
-               my ($name, $symbol) = ($mapping[$i], $mapping[$i+1]);
+       for (my $i = 0; $i < @cgi_param_mapping; $i += 2) {
+               my ($name, $symbol) = ($cgi_param_mapping[$i], $cgi_param_mapping[$i+1]);
                if (defined $params{$name}) {
                        if (ref($params{$name}) eq "ARRAY") {
                                foreach my $par (@{$params{$name}}) {
@@ -672,6 +849,24 @@ (%)
 ## ======================================================================
 ## validation, quoting/unquoting and escaping
 
+sub validate_action {
+       my $input = shift || return undef;
+       return undef unless exists $actions{$input};
+       return $input;
+}
+
+sub validate_project {
+       my $input = shift || return undef;
+       if (!validate_pathname($input) ||
+               !(-d "$projectroot/$input") ||
+               !check_export_ok("$projectroot/$input") ||
+               ($strict_export && !project_in_list($input))) {
+               return undef;
+       } else {
+               return $input;
+       }
+}
+
 sub validate_pathname {
        my $input = shift || return undef;
 
@@ -782,7 +977,7 @@ sub quot_cec {
        );
        my $chr = ( (exists $es{$cntrl})
                    ? $es{$cntrl}
-                   : sprintf('\%03o', ord($cntrl)) );
+                   : sprintf('\%2x', ord($cntrl)) );
        if ($opts{-nohtml}) {
                return $chr;
        } else {
@@ -1097,13 +1292,23 @@ sub format_log_line_html {
 }
 
 # format marker of refs pointing to given object
+
+# the destination action is chosen based on object type and current context:
+# - for annotated tags, we choose the tag view unless it's the current view
+#   already, in which case we go to shortlog view
+# - for other refs, we keep the current view if we're in history, shortlog or
+#   log view, and select shortlog otherwise
 sub format_ref_marker {
        my ($refs, $id) = @_;
        my $markers = '';
 
        if (defined $refs->{$id}) {
                foreach my $ref (@{$refs->{$id}}) {
+                       # this code exploits the fact that non-lightweight tags are the
+                       # only indirect objects, and that they are the only objects for which
+                       # we want to use tag instead of shortlog as action
                        my ($type, $name) = qw();
+                       my $indirect = ($ref =~ s/\^\{\}$//);
                        # e.g. tags/v2.6.11 or heads/next
                        if ($ref =~ m!^(.*?)s?/(.*)$!) {
                                $type = $1;
@@ -1113,8 +1318,29 @@ sub format_ref_marker {
                                $name = $ref;
                        }
 
-                       $markers .= " <span class=\"$type\" title=\"$ref\">" .
-                                   esc_html($name) . "</span>";
+                       my $class = $type;
+                       $class .= " indirect" if $indirect;
+
+                       my $dest_action = "shortlog";
+
+                       if ($indirect) {
+                               $dest_action = "tag" unless $action eq "tag";
+                       } elsif ($action =~ /^(history|(short)?log)$/) {
+                               $dest_action = $action;
+                       }
+
+                       my $dest = "";
+                       $dest .= "refs/" unless $ref =~ m!^refs/!;
+                       $dest .= $ref;
+
+                       my $link = $cgi->a({
+                               -href => href(
+                                       action=>$dest_action,
+                                       hash=>$dest
+                               )}, $name);
+
+                       $markers .= " <span class=\"$class\" title=\"$ref\">" .
+                               $link . "</span>";
                }
        }
 
@@ -1731,6 +1957,71 @@ sub git_get_project_description {
        return $descr;
 }
 
+sub git_get_project_ctags {
+       my $path = shift;
+       my $ctags = {};
+
+       $git_dir = "$projectroot/$path";
+       unless (opendir D, "$git_dir/ctags") {
+               return $ctags;
+       }
+       foreach (grep { -f $_ } map { "$git_dir/ctags/$_" } readdir(D)) {
+               open CT, $_ or next;
+               my $val = <CT>;
+               chomp $val;
+               close CT;
+               my $ctag = $_; $ctag =~ s#.*/##;
+               $ctags->{$ctag} = $val;
+       }
+       closedir D;
+       $ctags;
+}
+
+sub git_populate_project_tagcloud {
+       my $ctags = shift;
+
+       # First, merge different-cased tags; tags vote on casing
+       my %ctags_lc;
+       foreach (keys %$ctags) {
+               $ctags_lc{lc $_}->{count} += $ctags->{$_};
+               if (not $ctags_lc{lc $_}->{topcount}
+                   or $ctags_lc{lc $_}->{topcount} < $ctags->{$_}) {
+                       $ctags_lc{lc $_}->{topcount} = $ctags->{$_};
+                       $ctags_lc{lc $_}->{topname} = $_;
+               }
+       }
+
+       my $cloud;
+       if (eval { require HTML::TagCloud; 1; }) {
+               $cloud = HTML::TagCloud->new;
+               foreach (sort keys %ctags_lc) {
+                       # Pad the title with spaces so that the cloud looks
+                       # less crammed.
+                       my $title = $ctags_lc{$_}->{topname};
+                       $title =~ s/ /&nbsp;/g;
+                       $title =~ s/^/&nbsp;/g;
+                       $title =~ s/$/&nbsp;/g;
+                       $cloud->add($title, $home_link."?by_tag=".$_, $ctags_lc{$_}->{count});
+               }
+       } else {
+               $cloud = \%ctags_lc;
+       }
+       $cloud;
+}
+
+sub git_show_project_tagcloud {
+       my ($cloud, $count) = @_;
+       print STDERR ref($cloud)."..\n";
+       if (ref $cloud eq 'HTML::TagCloud') {
+               return $cloud->html_and_css($count);
+       } else {
+               my @tags = sort { $cloud->{$a}->{count} <=> $cloud->{$b}->{count} } keys %$cloud;
+               return '<p align="center">' . join (', ', map {
+                       "<a href=\"$home_link?by_tag=$_\">$cloud->{$_}->{topname}</a>"
+               } splice(@tags, 0, $count)) . '</p>';
+       }
+}
+
 sub git_get_project_url_list {
        my $path = shift;
 
@@ -1779,9 +2070,7 @@ sub git_get_projects_list {
 
                                my $subdir = substr($File::Find::name, $pfxlen + 1);
                                # we check related file in $projectroot
-                               if ($check_forks and $subdir =~ m#/.#) {
-                                       $File::Find::prune = 1;
-                               } elsif (check_export_ok("$projectroot/$filter/$subdir")) {
+                               if (check_export_ok("$projectroot/$filter/$subdir")) {
                                        push @list, { path => ($filter ? "$filter/" : '') . $subdir };
                                        $File::Find::prune = 1;
                                }
@@ -1925,7 +2214,7 @@ sub git_get_references {
 
        while (my $line = <$fd>) {
                chomp $line;
-               if ($line =~ m!^([0-9a-fA-F]{40})\srefs/($type/?[^^]+)!) {
+               if ($line =~ m!^([0-9a-fA-F]{40})\srefs/($type.*)$!) {
                        if (defined $refs{$1}) {
                                push @{$refs{$1}}, $2;
                        } else {
@@ -2733,13 +3022,26 @@ sub git_print_page_nav {
                        }
                }
        }
+
        $arg{'tree'}{'hash'} = $treehead if defined $treehead;
        $arg{'tree'}{'hash_base'} = $treebase if defined $treebase;
 
+       my @actions = gitweb_check_feature('actions');
+       while (@actions) {
+               my ($label, $link, $pos) = (shift(@actions), shift(@actions), shift(@actions));
+               @navs = map { $_ eq $pos ? ($_, $label) : $_ } @navs;
+               # munch munch
+               $link =~ s#%n#$project#g;
+               $link =~ s#%f#$git_dir#g;
+               $treehead ? $link =~ s#%h#$treehead#g : $link =~ s#%h##g;
+               $treebase ? $link =~ s#%b#$treebase#g : $link =~ s#%b##g;
+               $arg{$label}{'_href'} = $link;
+       }
+
        print "<div class=\"page_nav\">\n" .
                (join " | ",
                 map { $_ eq $current ?
-                      $_ : $cgi->a({-href => href(%{$arg{$_}})}, "$_")
+                      $_ : $cgi->a({-href => ($arg{$_}{_href} ? $arg{$_}{_href} : href(%{$arg{$_}}))}, "$_")
                 } @navs);
        print "<br/>\n$extra<br/>\n" .
              "</div>\n";
@@ -3549,6 +3851,7 @@ sub fill_project_list_info {
        my ($projlist, $check_forks) = @_;
        my @projects;
 
+       my $show_ctags = gitweb_check_feature('ctags');
  PROJECT:
        foreach my $pr (@$projlist) {
                my (@activity) = git_get_last_activity($pr->{'path'});
@@ -3575,25 +3878,20 @@ sub fill_project_list_info {
                                $pr->{'forks'} = 0;
                        }
                }
+               $show_ctags and $pr->{'ctags'} = git_get_project_ctags($pr->{'path'});
                push @projects, $pr;
        }
 
        return @projects;
 }
 
-# print 'sort by' <th> element, either sorting by $key if $name eq $order
-# (changing $list), or generating 'sort by $name' replay link otherwise
+# print 'sort by' <th> element, generating 'sort by $name' replay link
+# if that order is not selected
 sub print_sort_th {
-       my ($str_sort, $name, $order, $key, $header, $list) = @_;
-       $key    ||= $name;
+       my ($name, $order, $header) = @_;
        $header ||= ucfirst($name);
 
        if ($order eq $name) {
-               if ($str_sort) {
-                       @$list = sort {$a->{$key} cmp $b->{$key}} @$list;
-               } else {
-                       @$list = sort {$a->{$key} <=> $b->{$key}} @$list;
-               }
                print "<th>$header</th>\n";
        } else {
                print "<th>" .
@@ -3603,15 +3901,8 @@ sub print_sort_th {
        }
 }
 
-sub print_sort_th_str {
-       print_sort_th(1, @_);
-}
-
-sub print_sort_th_num {
-       print_sort_th(0, @_);
-}
-
 sub git_project_list_body {
+       # actually uses global variable $project
        my ($projlist, $order, $from, $to, $extra, $no_header) = @_;
 
        my ($check_forks) = gitweb_check_feature('forks');
@@ -3621,26 +3912,60 @@ sub git_project_list_body {
        $from = 0 unless defined $from;
        $to = $#projects if (!defined $to || $#projects < $to);
 
+       my %order_info = (
+               project => { key => 'path', type => 'str' },
+               descr => { key => 'descr_long', type => 'str' },
+               owner => { key => 'owner', type => 'str' },
+               age => { key => 'age', type => 'num' }
+       );
+       my $oi = $order_info{$order};
+       if ($oi->{'type'} eq 'str') {
+               @projects = sort {$a->{$oi->{'key'}} cmp $b->{$oi->{'key'}}} @projects;
+       } else {
+               @projects = sort {$a->{$oi->{'key'}} <=> $b->{$oi->{'key'}}} @projects;
+       }
+
+       my $show_ctags = gitweb_check_feature('ctags');
+       if ($show_ctags) {
+               my %ctags;
+               foreach my $p (@projects) {
+                       foreach my $ct (keys %{$p->{'ctags'}}) {
+                               $ctags{$ct} += $p->{'ctags'}->{$ct};
+                       }
+               }
+               my $cloud = git_populate_project_tagcloud(\%ctags);
+               print git_show_project_tagcloud($cloud, 64);
+       }
+
        print "<table class=\"project_list\">\n";
        unless ($no_header) {
                print "<tr>\n";
                if ($check_forks) {
                        print "<th></th>\n";
                }
-               print_sort_th_str('project', $order, 'path',
-                                 'Project', \@projects);
-               print_sort_th_str('descr', $order, 'descr_long',
-                                 'Description', \@projects);
-               print_sort_th_str('owner', $order, 'owner',
-                                 'Owner', \@projects);
-               print_sort_th_num('age', $order, 'age',
-                                 'Last Change', \@projects);
+               print_sort_th('project', $order, 'Project');
+               print_sort_th('descr', $order, 'Description');
+               print_sort_th('owner', $order, 'Owner');
+               print_sort_th('age', $order, 'Last Change');
                print "<th></th>\n" . # for links
                      "</tr>\n";
        }
        my $alternate = 1;
+       my $tagfilter = $cgi->param('by_tag');
        for (my $i = $from; $i <= $to; $i++) {
                my $pr = $projects[$i];
+
+               next if $tagfilter and $show_ctags and not grep { lc $_ eq lc $tagfilter } keys %{$pr->{'ctags'}};
+               next if $searchtext and not $pr->{'path'} =~ /$searchtext/
+                       and not $pr->{'descr_long'} =~ /$searchtext/;
+               # Weed out forks or non-matching entries of search
+               if ($check_forks) {
+                       my $forkbase = $project; $forkbase ||= ''; $forkbase =~ s#\.git$#/#;
+                       $forkbase="^$forkbase" if $forkbase;
+                       next if not $searchtext and not $tagfilter and $show_ctags
+                               and $pr->{'path'} =~ m#$forkbase.*/.*#; # regexp-safe
+               }
+
                if ($alternate) {
                        print "<tr class=\"dark\">\n";
                } else {
@@ -3957,7 +4282,7 @@ sub git_search_grep_body {
 ## actions
 
 sub git_project_list {
-       my $order = $cgi->param('o');
+       my $order = $input_params{'order'};
        if (defined $order && $order !~ m/none|project|descr|owner|age/) {
                die_error(400, "Unknown order parameter");
        }
@@ -3975,12 +4300,17 @@ sub git_project_list {
                close $fd;
                print "</div>\n";
        }
+       print $cgi->startform(-method => "get") .
+             "<p class=\"projsearch\">Search:\n" .
+             $cgi->textfield(-name => "s", -value => $searchtext) . "\n" .
+             "</p>" .
+             $cgi->end_form() . "\n";
        git_project_list_body(\@list, $order);
        git_footer_html();
 }
 
 sub git_forks {
-       my $order = $cgi->param('o');
+       my $order = $input_params{'order'};
        if (defined $order && $order !~ m/none|project|descr|owner|age/) {
                die_error(400, "Unknown order parameter");
        }
@@ -4046,10 +4376,10 @@ sub git_summary {
 
        print "<div class=\"title\">&nbsp;</div>\n";
        print "<table class=\"projects_list\">\n" .
-             "<tr><td>description</td><td>" . esc_html($descr) . "</td></tr>\n" .
-             "<tr><td>owner</td><td>" . esc_html($owner) . "</td></tr>\n";
+             "<tr id=\"metadata_desc\"><td>description</td><td>" . esc_html($descr) . "</td></tr>\n" .
+             "<tr id=\"metadata_owner\"><td>owner</td><td>" . esc_html($owner) . "</td></tr>\n";
        if (defined $cd{'rfc2822'}) {
-               print "<tr><td>last change</td><td>$cd{'rfc2822'}</td></tr>\n";
+               print "<tr id=\"metadata_lchange\"><td>last change</td><td>$cd{'rfc2822'}</td></tr>\n";
        }
 
        # use per project git URL list in $projectroot/$project/cloneurl
@@ -4059,9 +4389,23 @@ sub git_summary {
        @url_list = map { "$_/$project" } @git_base_url_list unless @url_list;
        foreach my $git_url (@url_list) {
                next unless $git_url;
-               print "<tr><td>$url_tag</td><td>$git_url</td></tr>\n";
+               print "<tr class=\"metadata_url\"><td>$url_tag</td><td>$git_url</td></tr>\n";
                $url_tag = "";
        }
+
+       # Tag cloud
+       my $show_ctags = (gitweb_check_feature('ctags'))[0];
+       if ($show_ctags) {
+               my $ctags = git_get_project_ctags($project);
+               my $cloud = git_populate_project_tagcloud($ctags);
+               print "<tr id=\"metadata_ctags\"><td>Content tags:<br />";
+               print "</td>\n<td>" unless %$ctags;
+               print "<form action=\"$show_ctags\" method=\"post\"><input type=\"hidden\" name=\"p\" value=\"$project\" />Add: <input type=\"text\" name=\"t\" size=\"8\" /></form>";
+               print "</td>\n<td>" if %$ctags;
+               print git_show_project_tagcloud($cloud, 48);
+               print "</td></tr>";
+       }
+
        print "</table>\n";
 
        if (-s "$projectroot/$project/README.html") {
@@ -4100,10 +4444,10 @@ sub git_summary {
 
        if (@forklist) {
                git_print_header_div('forks');
-               git_project_list_body(\@forklist, undef, 0, 15,
+               git_project_list_body(\@forklist, 'age', 0, 15,
                                      $#forklist <= 15 ? undef :
                                      $cgi->a({-href => href(action=>"forks")}, "..."),
-                                     'noheader');
+                                     'no_header');
        }
 
        git_footer_html();
@@ -4421,6 +4765,7 @@ sub git_tree {
                        $hash = $hash_base;
                }
        }
+       die_error(404, "No such tree") unless defined($hash);
        $/ = "\0";
        open my $fd, "-|", git_cmd(), "ls-tree", '-z', $hash
                or die_error(500, "Open git-ls-tree failed");
@@ -4461,8 +4806,8 @@ sub git_tree {
                if ($basedir ne '' && substr($basedir, -1) ne '/') {
                        $basedir .= '/';
                }
+               git_print_page_path($file_name, 'tree', $hash_base);
        }
-       git_print_page_path($file_name, 'tree', $hash_base);
        print "<div class=\"page_body\">\n";
        print "<table class=\"tree\">\n";
        my $alternate = 1;
@@ -4513,7 +4858,7 @@ sub git_snapshot {
        my @supported_fmts = gitweb_check_feature('snapshot');
        @supported_fmts = filter_snapshot_fmts(@supported_fmts);
 
-       my $format = $cgi->param('sf');
+       my $format = $input_params{'snapshot_format'};
        if (!@supported_fmts) {
                die_error(403, "Snapshots not allowed");
        }
@@ -5474,7 +5819,11 @@ sub git_shortlog {
        }
        my $refs = git_get_references();
 
-       my @commitlist = parse_commits($hash, 101, (100 * $page));
+       my $commit_hash = $hash;
+       if (defined $hash_parent) {
+               $commit_hash = "$hash_parent..$hash";
+       }
+       my @commitlist = parse_commits($commit_hash, 101, (100 * $page));
 
        my $paging_nav = format_paging_nav('shortlog', $hash, $head, $page, $#commitlist >= 100);
        my $next_link = '';