+sub find_worktree
+{
+ # Git->repository->wc_path() does not honor changes to the working
+ # tree location made by $ENV{GIT_WORK_TREE} or the 'core.worktree'
+ # config variable.
+ my $worktree;
+ my $env_worktree = $ENV{GIT_WORK_TREE};
+ my $core_worktree = Git::config('core.worktree');
+
+ if (defined($env_worktree) and (length($env_worktree) > 0)) {
+ $worktree = $env_worktree;
+ } elsif (defined($core_worktree) and (length($core_worktree) > 0)) {
+ $worktree = $core_worktree;
+ } else {
+ $worktree = $repo->wc_path();
+ }
+
+ return $worktree;
+}
+
+my $workdir = find_worktree();
+
+sub setup_dir_diff
+{
+ # Run the diff; exit immediately if no diff found
+ # 'Repository' and 'WorkingCopy' must be explicitly set to insure that
+ # if $GIT_DIR and $GIT_WORK_TREE are set in ENV, they are actually used
+ # by Git->repository->command*.
+ my $diffrepo = Git->repository(Repository => $repo_path, WorkingCopy => $workdir);
+ my $diffrtn = $diffrepo->command_oneline('diff', '--raw', '--no-abbrev', '-z', @ARGV);
+ exit(0) if (length($diffrtn) == 0);
+
+ # Setup temp directories
+ my $tmpdir = tempdir('git-diffall.XXXXX', CLEANUP => 1, TMPDIR => 1);
+ my $ldir = "$tmpdir/left";
+ my $rdir = "$tmpdir/right";
+ mkpath($ldir) or die $!;
+ mkpath($rdir) or die $!;
+
+ # Build index info for left and right sides of the diff
+ my $submodule_mode = '160000';
+ my $symlink_mode = '120000';
+ my $null_mode = '0' x 6;
+ my $null_sha1 = '0' x 40;
+ my $lindex = '';
+ my $rindex = '';
+ my %submodule;
+ my %symlink;
+ my @rawdiff = split('\0', $diffrtn);
+
+ my $i = 0;
+ while ($i < $#rawdiff) {
+ if ($rawdiff[$i] =~ /^::/) {
+ print "Combined diff formats ('-c' and '--cc') are not supported in directory diff mode.\n";
+ exit(1);
+ }
+
+ my ($lmode, $rmode, $lsha1, $rsha1, $status) = split(' ', substr($rawdiff[$i], 1));
+ my $src_path = $rawdiff[$i + 1];
+ my $dst_path;
+
+ if ($status =~ /^[CR]/) {
+ $dst_path = $rawdiff[$i + 2];
+ $i += 3;
+ } else {
+ $dst_path = $src_path;
+ $i += 2;
+ }
+
+ if (($lmode eq $submodule_mode) or ($rmode eq $submodule_mode)) {
+ $submodule{$src_path}{left} = $lsha1;
+ if ($lsha1 ne $rsha1) {
+ $submodule{$dst_path}{right} = $rsha1;
+ } else {
+ $submodule{$dst_path}{right} = "$rsha1-dirty";
+ }
+ next;
+ }
+
+ if ($lmode eq $symlink_mode) {
+ $symlink{$src_path}{left} = $diffrepo->command_oneline('show', "$lsha1");
+ }
+
+ if ($rmode eq $symlink_mode) {
+ $symlink{$dst_path}{right} = $diffrepo->command_oneline('show', "$rsha1");
+ }
+
+ if (($lmode ne $null_mode) and ($status !~ /^C/)) {
+ $lindex .= "$lmode $lsha1\t$src_path\0";
+ }
+
+ if ($rmode ne $null_mode) {
+ if ($rsha1 ne $null_sha1) {
+ $rindex .= "$rmode $rsha1\t$dst_path\0";
+ } else {
+ push(@working_tree, $dst_path);
+ }
+ }
+ }
+
+ # If $GIT_DIR is not set prior to calling 'git update-index' and
+ # 'git checkout-index', then those commands will fail if difftool
+ # is called from a directory other than the repo root.
+ my $must_unset_git_dir = 0;
+ if (not defined($ENV{GIT_DIR})) {
+ $must_unset_git_dir = 1;
+ $ENV{GIT_DIR} = $repo_path;
+ }
+
+ # Populate the left and right directories based on each index file
+ my ($inpipe, $ctx);
+ $ENV{GIT_INDEX_FILE} = "$tmpdir/lindex";
+ ($inpipe, $ctx) = $repo->command_input_pipe(qw/update-index -z --index-info/);
+ print($inpipe $lindex);
+ $repo->command_close_pipe($inpipe, $ctx);
+ $rc = system('git', 'checkout-index', '--all', "--prefix=$ldir/");
+ exit($rc | ($rc >> 8)) if ($rc != 0);
+
+ $ENV{GIT_INDEX_FILE} = "$tmpdir/rindex";
+ ($inpipe, $ctx) = $repo->command_input_pipe(qw/update-index -z --index-info/);
+ print($inpipe $rindex);
+ $repo->command_close_pipe($inpipe, $ctx);
+ $rc = system('git', 'checkout-index', '--all', "--prefix=$rdir/");
+ exit($rc | ($rc >> 8)) if ($rc != 0);
+
+ # If $GIT_DIR was explicitly set just for the update/checkout
+ # commands, then it should be unset before continuing.
+ delete($ENV{GIT_DIR}) if ($must_unset_git_dir);
+ delete($ENV{GIT_INDEX_FILE});
+
+ # Changes in the working tree need special treatment since they are
+ # not part of the index
+ for my $file (@working_tree) {
+ my $dir = dirname($file);
+ unless (-d "$rdir/$dir") {
+ mkpath("$rdir/$dir") or die $!;
+ }
+ copy("$workdir/$file", "$rdir/$file") or die $!;
+ chmod(stat("$workdir/$file")->mode, "$rdir/$file") or die $!;
+ }
+
+ # Changes to submodules require special treatment. This loop writes a
+ # temporary file to both the left and right directories to show the
+ # change in the recorded SHA1 for the submodule.
+ for my $path (keys %submodule) {
+ if (defined($submodule{$path}{left})) {
+ write_to_file("$ldir/$path", "Subproject commit $submodule{$path}{left}");
+ }
+ if (defined($submodule{$path}{right})) {
+ write_to_file("$rdir/$path", "Subproject commit $submodule{$path}{right}");
+ }
+ }
+
+ # Symbolic links require special treatment. The standard "git diff"
+ # shows only the link itself, not the contents of the link target.
+ # This loop replicates that behavior.
+ for my $path (keys %symlink) {
+ if (defined($symlink{$path}{left})) {
+ write_to_file("$ldir/$path", $symlink{$path}{left});
+ }
+ if (defined($symlink{$path}{right})) {
+ write_to_file("$rdir/$path", $symlink{$path}{right});
+ }
+ }
+
+ return ($ldir, $rdir);
+}
+
+sub write_to_file
+{
+ my $path = shift;
+ my $value = shift;
+
+ # Make sure the path to the file exists
+ my $dir = dirname($path);
+ unless (-d "$dir") {
+ mkpath("$dir") or die $!;
+ }
+
+ # If the file already exists in that location, delete it. This
+ # is required in the case of symbolic links.
+ unlink("$path");
+
+ open(my $fh, '>', "$path") or die $!;
+ print($fh $value);
+ close($fh);
+}
+