--- /dev/null
+#!/usr/bin/perl -w
+
+use strict;
+
+sub run_cmd_pipe {
+ my $fh = undef;
+ open($fh, '-|', @_) or die;
+ return <$fh>;
+}
+
+my ($GIT_DIR) = run_cmd_pipe(qw(git rev-parse --git-dir));
+
+if (!defined $GIT_DIR) {
+ exit(1); # rev-parse would have already said "not a git repo"
+}
+chomp($GIT_DIR);
+
+sub refresh {
+ my $fh;
+ open $fh, '-|', qw(git update-index --refresh)
+ or die;
+ while (<$fh>) {
+ ;# ignore 'needs update'
+ }
+ close $fh;
+}
+
+sub list_untracked {
+ map {
+ chomp $_;
+ $_;
+ }
+ run_cmd_pipe(qw(git ls-files --others
+ --exclude-per-directory=.gitignore),
+ "--exclude-from=$GIT_DIR/info/exclude",
+ '--', @_);
+}
+
+my $status_fmt = '%12s %12s %s';
+my $status_head = sprintf($status_fmt, 'staged', 'unstaged', 'path');
+
+# Returns list of hashes, contents of each of which are:
+# PRINT: print message
+# VALUE: pathname
+# BINARY: is a binary path
+# INDEX: is index different from HEAD?
+# FILE: is file different from index?
+# INDEX_ADDDEL: is it add/delete between HEAD and index?
+# FILE_ADDDEL: is it add/delete between index and file?
+
+sub list_modified {
+ my ($only) = @_;
+ my (%data, @return);
+ my ($add, $del, $adddel, $file);
+
+ for (run_cmd_pipe(qw(git diff-index --cached
+ --numstat --summary HEAD))) {
+ if (($add, $del, $file) =
+ /^([-\d]+) ([-\d]+) (.*)/) {
+ my ($change, $bin);
+ if ($add eq '-' && $del eq '-') {
+ $change = 'binary';
+ $bin = 1;
+ }
+ else {
+ $change = "+$add/-$del";
+ }
+ $data{$file} = {
+ INDEX => $change,
+ BINARY => $bin,
+ FILE => 'nothing',
+ }
+ }
+ elsif (($adddel, $file) =
+ /^ (create|delete) mode [0-7]+ (.*)$/) {
+ $data{$file}{INDEX_ADDDEL} = $adddel;
+ }
+ }
+
+ for (run_cmd_pipe(qw(git diff-files --numstat --summary))) {
+ if (($add, $del, $file) =
+ /^([-\d]+) ([-\d]+) (.*)/) {
+ if (!exists $data{$file}) {
+ $data{$file} = +{
+ INDEX => 'unchanged',
+ BINARY => 0,
+ };
+ }
+ my ($change, $bin);
+ if ($add eq '-' && $del eq '-') {
+ $change = 'binary';
+ $bin = 1;
+ }
+ else {
+ $change = "+$add/-$del";
+ }
+ $data{$file}{FILE} = $change;
+ if ($bin) {
+ $data{$file}{BINARY} = 1;
+ }
+ }
+ elsif (($adddel, $file) =
+ /^ (create|delete) mode [0-7]+ (.*)$/) {
+ $data{$file}{FILE_ADDDEL} = $adddel;
+ }
+ }
+
+ for (sort keys %data) {
+ my $it = $data{$_};
+
+ if ($only) {
+ if ($only eq 'index-only') {
+ next if ($it->{INDEX} eq 'unchanged');
+ }
+ if ($only eq 'file-only') {
+ next if ($it->{FILE} eq 'nothing');
+ }
+ }
+ push @return, +{
+ VALUE => $_,
+ PRINT => (sprintf $status_fmt,
+ $it->{INDEX}, $it->{FILE}, $_),
+ %$it,
+ };
+ }
+ return @return;
+}
+
+sub find_unique {
+ my ($string, @stuff) = @_;
+ my $found = undef;
+ for (my $i = 0; $i < @stuff; $i++) {
+ my $it = $stuff[$i];
+ my $hit = undef;
+ if (ref $it) {
+ if ((ref $it) eq 'ARRAY') {
+ $it = $it->[0];
+ }
+ else {
+ $it = $it->{VALUE};
+ }
+ }
+ eval {
+ if ($it =~ /^$string/) {
+ $hit = 1;
+ };
+ };
+ if (defined $hit && defined $found) {
+ return undef;
+ }
+ if ($hit) {
+ $found = $i + 1;
+ }
+ }
+ return $found;
+}
+
+sub list_and_choose {
+ my ($opts, @stuff) = @_;
+ my (@chosen, @return);
+ my $i;
+
+ TOPLOOP:
+ while (1) {
+ my $last_lf = 0;
+
+ if ($opts->{HEADER}) {
+ if (!$opts->{LIST_FLAT}) {
+ print " ";
+ }
+ print "$opts->{HEADER}\n";
+ }
+ for ($i = 0; $i < @stuff; $i++) {
+ my $chosen = $chosen[$i] ? '*' : ' ';
+ my $print = $stuff[$i];
+ if (ref $print) {
+ if ((ref $print) eq 'ARRAY') {
+ $print = $print->[0];
+ }
+ else {
+ $print = $print->{PRINT};
+ }
+ }
+ printf("%s%2d: %s", $chosen, $i+1, $print);
+ if (($opts->{LIST_FLAT}) &&
+ (($i + 1) % ($opts->{LIST_FLAT}))) {
+ print "\t";
+ $last_lf = 0;
+ }
+ else {
+ print "\n";
+ $last_lf = 1;
+ }
+ }
+ if (!$last_lf) {
+ print "\n";
+ }
+
+ return if ($opts->{LIST_ONLY});
+
+ print $opts->{PROMPT};
+ if ($opts->{SINGLETON}) {
+ print "> ";
+ }
+ else {
+ print ">> ";
+ }
+ my $line = <STDIN>;
+ last if (!$line);
+ chomp $line;
+ my $donesomething = 0;
+ for my $choice (split(/[\s,]+/, $line)) {
+ my $choose = 1;
+ my ($bottom, $top);
+
+ # Input that begins with '-'; unchoose
+ if ($choice =~ s/^-//) {
+ $choose = 0;
+ }
+ # A range can be specified like 5-7
+ if ($choice =~ /^(\d+)-(\d+)$/) {
+ ($bottom, $top) = ($1, $2);
+ }
+ elsif ($choice =~ /^\d+$/) {
+ $bottom = $top = $choice;
+ }
+ elsif ($choice eq '*') {
+ $bottom = 1;
+ $top = 1 + @stuff;
+ }
+ else {
+ $bottom = $top = find_unique($choice, @stuff);
+ if (!defined $bottom) {
+ print "Huh ($choice)?\n";
+ next TOPLOOP;
+ }
+ }
+ if ($opts->{SINGLETON} && $bottom != $top) {
+ print "Huh ($choice)?\n";
+ next TOPLOOP;
+ }
+ for ($i = $bottom-1; $i <= $top-1; $i++) {
+ next if (@stuff <= $i);
+ $chosen[$i] = $choose;
+ $donesomething++;
+ }
+ }
+ last if (!$donesomething || $opts->{IMMEDIATE});
+ }
+ for ($i = 0; $i < @stuff; $i++) {
+ if ($chosen[$i]) {
+ push @return, $stuff[$i];
+ }
+ }
+ return @return;
+}
+
+sub status_cmd {
+ list_and_choose({ LIST_ONLY => 1, HEADER => $status_head },
+ list_modified());
+ print "\n";
+}
+
+sub say_n_paths {
+ my $did = shift @_;
+ my $cnt = scalar @_;
+ print "$did ";
+ if (1 < $cnt) {
+ print "$cnt paths\n";
+ }
+ else {
+ print "one path\n";
+ }
+}
+
+sub update_cmd {
+ my @mods = list_modified('file-only');
+ return if (!@mods);
+
+ my @update = list_and_choose({ PROMPT => 'Update',
+ HEADER => $status_head, },
+ @mods);
+ if (@update) {
+ system(qw(git update-index --add --),
+ map { $_->{VALUE} } @update);
+ say_n_paths('updated', @update);
+ }
+ print "\n";
+}
+
+sub revert_cmd {
+ my @update = list_and_choose({ PROMPT => 'Revert',
+ HEADER => $status_head, },
+ list_modified());
+ if (@update) {
+ my @lines = run_cmd_pipe(qw(git ls-tree HEAD --),
+ map { $_->{VALUE} } @update);
+ my $fh;
+ open $fh, '|-', qw(git update-index --index-info)
+ or die;
+ for (@lines) {
+ print $fh $_;
+ }
+ close($fh);
+ for (@update) {
+ if ($_->{INDEX_ADDDEL} &&
+ $_->{INDEX_ADDDEL} eq 'create') {
+ system(qw(git update-index --force-remove --),
+ $_->{VALUE});
+ print "note: $_->{VALUE} is untracked now.\n";
+ }
+ }
+ refresh();
+ say_n_paths('reverted', @update);
+ }
+ print "\n";
+}
+
+sub add_untracked_cmd {
+ my @add = list_and_choose({ PROMPT => 'Add untracked' },
+ list_untracked());
+ if (@add) {
+ system(qw(git update-index --add --), @add);
+ say_n_paths('added', @add);
+ }
+ print "\n";
+}
+
+sub parse_diff {
+ my ($path) = @_;
+ my @diff = run_cmd_pipe(qw(git diff-files -p --), $path);
+ my (@hunk) = { TEXT => [] };
+
+ for (@diff) {
+ if (/^@@ /) {
+ push @hunk, { TEXT => [] };
+ }
+ push @{$hunk[-1]{TEXT}}, $_;
+ }
+ return @hunk;
+}
+
+sub help_patch_cmd {
+ print <<\EOF ;
+y - stage this hunk
+n - do not stage this hunk
+a - stage this and all the remaining hunks
+d - do not stage this hunk nor any of the remaining hunks
+j - leave this hunk undecided, see next undecided hunk
+J - leave this hunk undecided, see next hunk
+k - leave this hunk undecided, see previous undecided hunk
+K - leave this hunk undecided, see previous hunk
+EOF
+}
+
+sub patch_update_cmd {
+ my @mods = list_modified('file-only');
+ @mods = grep { !($_->{BINARY}) } @mods;
+ return if (!@mods);
+
+ my ($it) = list_and_choose({ PROMPT => 'Patch update',
+ SINGLETON => 1,
+ IMMEDIATE => 1,
+ HEADER => $status_head, },
+ @mods);
+ return if (!$it);
+
+ my ($ix, $num);
+ my $path = $it->{VALUE};
+ my ($head, @hunk) = parse_diff($path);
+ for (@{$head->{TEXT}}) {
+ print;
+ }
+ $num = scalar @hunk;
+ $ix = 0;
+
+ while (1) {
+ my ($prev, $next, $other, $undecided);
+ $other = '';
+
+ if ($num <= $ix) {
+ $ix = 0;
+ }
+ for (my $i = 0; $i < $ix; $i++) {
+ if (!defined $hunk[$i]{USE}) {
+ $prev = 1;
+ $other .= '/k';
+ last;
+ }
+ }
+ if ($ix) {
+ $other .= '/K';
+ }
+ for (my $i = $ix + 1; $i < $num; $i++) {
+ if (!defined $hunk[$i]{USE}) {
+ $next = 1;
+ $other .= '/j';
+ last;
+ }
+ }
+ if ($ix < $num - 1) {
+ $other .= '/J';
+ }
+ for (my $i = 0; $i < $num; $i++) {
+ if (!defined $hunk[$i]{USE}) {
+ $undecided = 1;
+ last;
+ }
+ }
+ last if (!$undecided);
+
+ for (@{$hunk[$ix]{TEXT}}) {
+ print;
+ }
+ print "Stage this hunk [y/n/a/d$other/?]? ";
+ my $line = <STDIN>;
+ if ($line) {
+ if ($line =~ /^y/i) {
+ $hunk[$ix]{USE} = 1;
+ }
+ elsif ($line =~ /^n/i) {
+ $hunk[$ix]{USE} = 0;
+ }
+ elsif ($line =~ /^a/i) {
+ while ($ix < $num) {
+ if (!defined $hunk[$ix]{USE}) {
+ $hunk[$ix]{USE} = 1;
+ }
+ $ix++;
+ }
+ next;
+ }
+ elsif ($line =~ /^d/i) {
+ while ($ix < $num) {
+ if (!defined $hunk[$ix]{USE}) {
+ $hunk[$ix]{USE} = 0;
+ }
+ $ix++;
+ }
+ next;
+ }
+ elsif ($other =~ /K/ && $line =~ /^K/) {
+ $ix--;
+ next;
+ }
+ elsif ($other =~ /J/ && $line =~ /^J/) {
+ $ix++;
+ next;
+ }
+ elsif ($other =~ /k/ && $line =~ /^k/) {
+ while (1) {
+ $ix--;
+ last if (!$ix ||
+ !defined $hunk[$ix]{USE});
+ }
+ next;
+ }
+ elsif ($other =~ /j/ && $line =~ /^j/) {
+ while (1) {
+ $ix++;
+ last if ($ix >= $num ||
+ !defined $hunk[$ix]{USE});
+ }
+ next;
+ }
+ else {
+ help_patch_cmd($other);
+ next;
+ }
+ # soft increment
+ while (1) {
+ $ix++;
+ last if ($ix >= $num ||
+ !defined $hunk[$ix]{USE});
+ }
+ }
+ }
+
+ my ($o_lno, $n_lno);
+ my @result = ();
+ for (@hunk) {
+ my $text = $_->{TEXT};
+ my ($o_ofs, $o_cnt, $n_ofs, $n_cnt) =
+ $text->[0] =~ /^@@ -(\d+)(?:,(\d+)) \+(\d+)(?:,(\d+)) @@/;
+ if (!$_->{USE}) {
+ # Adjust offset here.
+ next;
+ }
+ else {
+ for (@$text) {
+ push @result, $_;
+ }
+ }
+ }
+
+ if (@result) {
+ my $fh;
+
+ open $fh, '|-', qw(git apply --cached);
+ for (@{$head->{TEXT}}, @result) {
+ print $fh $_;
+ }
+ close $fh;
+ refresh();
+ }
+
+ print "\n";
+}
+
+sub diff_cmd {
+ my @mods = list_modified('index-only');
+ @mods = grep { !($_->{BINARY}) } @mods;
+ return if (!@mods);
+ my (@them) = list_and_choose({ PROMPT => 'Review diff',
+ IMMEDIATE => 1,
+ HEADER => $status_head, },
+ @mods);
+ return if (!@them);
+ system(qw(git diff-index -p --cached HEAD --),
+ map { $_->{VALUE} } @them);
+}
+
+sub quit_cmd {
+ print "Bye.\n";
+ exit(0);
+}
+
+sub help_cmd {
+ print <<\EOF ;
+status - show paths with changes
+update - add working tree state to the staged set of changes
+revert - revert staged set of changes back to the HEAD version
+patch - pick hunks and update selectively
+diff - view diff between HEAD and index
+add untracked - add contents of untracked files to the staged set of changes
+EOF
+}
+
+sub main_loop {
+ my @cmd = ([ 'status', \&status_cmd, ],
+ [ 'update', \&update_cmd, ],
+ [ 'revert', \&revert_cmd, ],
+ [ 'add untracked', \&add_untracked_cmd, ],
+ [ 'patch', \&patch_update_cmd, ],
+ [ 'diff', \&diff_cmd, ],
+ [ 'quit', \&quit_cmd, ],
+ [ 'help', \&help_cmd, ],
+ );
+ while (1) {
+ my ($it) = list_and_choose({ PROMPT => 'What now',
+ SINGLETON => 1,
+ LIST_FLAT => 4,
+ HEADER => '*** Commands ***',
+ IMMEDIATE => 1 }, @cmd);
+ if ($it) {
+ eval {
+ $it->[1]->();
+ };
+ if ($@) {
+ print "$@";
+ }
+ }
+ }
+}
+
+my @z;
+
+refresh();
+status_cmd();
+main_loop();