2012-04-23 18:23:41 +00:00
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#!/usr/bin/perl
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2010-01-15 22:03:43 +00:00
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# Copyright (c) 2009, 2010 David Aguilar
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2012-04-23 18:23:41 +00:00
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# Copyright (c) 2012 Tim Henigan
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2009-01-16 08:00:02 +00:00
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#
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# This is a wrapper around the GIT_EXTERNAL_DIFF-compatible
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2009-04-07 08:21:22 +00:00
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# git-difftool--helper script.
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#
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# This script exports GIT_EXTERNAL_DIFF and GIT_PAGER for use by git.
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2012-04-23 18:23:41 +00:00
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# The GIT_DIFF* variables are exported for use by git-difftool--helper.
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2009-04-07 08:21:22 +00:00
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#
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2009-01-16 08:00:02 +00:00
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# Any arguments that are unknown to this script are forwarded to 'git diff'.
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2010-09-24 20:00:52 +00:00
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use 5.008;
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2009-01-16 08:00:02 +00:00
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use strict;
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use warnings;
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2012-07-25 03:14:22 +00:00
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use File::Basename qw(dirname);
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2012-04-23 18:23:41 +00:00
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use File::Copy;
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2012-07-19 08:27:09 +00:00
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use File::Compare;
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2012-07-25 03:14:22 +00:00
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use File::Find;
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2012-04-23 18:23:41 +00:00
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use File::stat;
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use File::Path qw(mkpath);
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use File::Temp qw(tempdir);
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2012-03-22 19:52:16 +00:00
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use Getopt::Long qw(:config pass_through);
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use Git;
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2009-01-16 08:00:02 +00:00
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sub usage
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{
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2012-03-22 19:52:18 +00:00
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my $exitcode = shift;
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2009-01-16 08:00:02 +00:00
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print << 'USAGE';
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2012-03-29 13:39:18 +00:00
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usage: git difftool [-t|--tool=<tool>] [--tool-help]
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2012-03-22 19:52:17 +00:00
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[-x|--extcmd=<cmd>]
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[-g|--gui] [--no-gui]
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2012-03-22 19:52:16 +00:00
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[--prompt] [-y|--no-prompt]
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2012-04-23 18:23:41 +00:00
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[-d|--dir-diff]
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2010-01-15 22:03:43 +00:00
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['git diff' options]
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2009-01-16 08:00:02 +00:00
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USAGE
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2012-03-22 19:52:18 +00:00
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exit($exitcode);
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2009-01-16 08:00:02 +00:00
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}
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2012-04-23 18:23:41 +00:00
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sub find_worktree
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{
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2012-07-23 03:57:08 +00:00
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my ($repo) = @_;
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2012-04-23 18:23:41 +00:00
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# Git->repository->wc_path() does not honor changes to the working
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# tree location made by $ENV{GIT_WORK_TREE} or the 'core.worktree'
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# config variable.
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my $worktree;
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my $env_worktree = $ENV{GIT_WORK_TREE};
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my $core_worktree = Git::config('core.worktree');
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if (defined($env_worktree) and (length($env_worktree) > 0)) {
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$worktree = $env_worktree;
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} elsif (defined($core_worktree) and (length($core_worktree) > 0)) {
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$worktree = $core_worktree;
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} else {
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$worktree = $repo->wc_path();
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}
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return $worktree;
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}
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2012-07-25 03:14:22 +00:00
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sub filter_tool_scripts
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{
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my ($tools) = @_;
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if (-d $_) {
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if ($_ ne ".") {
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# Ignore files in subdirectories
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$File::Find::prune = 1;
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}
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} else {
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if ((-f $_) && ($_ ne "defaults")) {
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push(@$tools, $_);
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}
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}
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}
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2012-03-29 13:39:18 +00:00
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sub print_tool_help
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{
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2012-07-25 03:14:22 +00:00
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my ($cmd, @found, @notfound, @tools);
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2012-03-29 13:39:18 +00:00
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my $gitpath = Git::exec_path();
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2012-07-25 03:14:22 +00:00
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find(sub { filter_tool_scripts(\@tools) }, "$gitpath/mergetools");
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2012-03-29 13:39:18 +00:00
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foreach my $tool (@tools) {
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$cmd = "TOOL_MODE=diff";
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$cmd .= ' && . "$(git --exec-path)/git-mergetool--lib"';
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$cmd .= " && get_merge_tool_path $tool >/dev/null 2>&1";
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$cmd .= " && can_diff >/dev/null 2>&1";
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if (system('sh', '-c', $cmd) == 0) {
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push(@found, $tool);
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} else {
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push(@notfound, $tool);
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}
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}
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print "'git difftool --tool=<tool>' may be set to one of the following:\n";
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2012-07-25 03:14:22 +00:00
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print "\t$_\n" for (sort(@found));
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2012-03-29 13:39:18 +00:00
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print "\nThe following tools are valid, but not currently available:\n";
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2012-07-25 03:14:22 +00:00
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print "\t$_\n" for (sort(@notfound));
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2012-03-29 13:39:18 +00:00
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print "\nNOTE: Some of the tools listed above only work in a windowed\n";
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print "environment. If run in a terminal-only session, they will fail.\n";
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exit(0);
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}
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2012-04-23 18:23:41 +00:00
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sub setup_dir_diff
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{
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2012-07-23 06:05:30 +00:00
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my ($repo, $workdir, $symlinks) = @_;
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2012-07-23 03:57:08 +00:00
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2012-04-23 18:23:41 +00:00
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# Run the diff; exit immediately if no diff found
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# 'Repository' and 'WorkingCopy' must be explicitly set to insure that
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# if $GIT_DIR and $GIT_WORK_TREE are set in ENV, they are actually used
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# by Git->repository->command*.
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2012-07-23 03:57:08 +00:00
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my $repo_path = $repo->repo_path();
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2012-04-23 18:23:41 +00:00
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my $diffrepo = Git->repository(Repository => $repo_path, WorkingCopy => $workdir);
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my $diffrtn = $diffrepo->command_oneline('diff', '--raw', '--no-abbrev', '-z', @ARGV);
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exit(0) if (length($diffrtn) == 0);
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# Setup temp directories
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2012-07-23 03:57:10 +00:00
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my $tmpdir = tempdir('git-difftool.XXXXX', CLEANUP => 1, TMPDIR => 1);
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2012-04-23 18:23:41 +00:00
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my $ldir = "$tmpdir/left";
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my $rdir = "$tmpdir/right";
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mkpath($ldir) or die $!;
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mkpath($rdir) or die $!;
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# Build index info for left and right sides of the diff
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my $submodule_mode = '160000';
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my $symlink_mode = '120000';
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my $null_mode = '0' x 6;
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my $null_sha1 = '0' x 40;
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my $lindex = '';
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my $rindex = '';
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my %submodule;
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my %symlink;
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2012-07-23 03:57:08 +00:00
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my @working_tree = ();
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2012-04-23 18:23:41 +00:00
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my @rawdiff = split('\0', $diffrtn);
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my $i = 0;
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while ($i < $#rawdiff) {
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if ($rawdiff[$i] =~ /^::/) {
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print "Combined diff formats ('-c' and '--cc') are not supported in directory diff mode.\n";
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exit(1);
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}
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my ($lmode, $rmode, $lsha1, $rsha1, $status) = split(' ', substr($rawdiff[$i], 1));
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my $src_path = $rawdiff[$i + 1];
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my $dst_path;
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if ($status =~ /^[CR]/) {
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$dst_path = $rawdiff[$i + 2];
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$i += 3;
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} else {
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$dst_path = $src_path;
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$i += 2;
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}
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if (($lmode eq $submodule_mode) or ($rmode eq $submodule_mode)) {
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$submodule{$src_path}{left} = $lsha1;
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if ($lsha1 ne $rsha1) {
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$submodule{$dst_path}{right} = $rsha1;
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} else {
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$submodule{$dst_path}{right} = "$rsha1-dirty";
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}
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next;
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}
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if ($lmode eq $symlink_mode) {
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$symlink{$src_path}{left} = $diffrepo->command_oneline('show', "$lsha1");
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}
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if ($rmode eq $symlink_mode) {
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$symlink{$dst_path}{right} = $diffrepo->command_oneline('show', "$rsha1");
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}
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if (($lmode ne $null_mode) and ($status !~ /^C/)) {
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$lindex .= "$lmode $lsha1\t$src_path\0";
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}
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if ($rmode ne $null_mode) {
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if ($rsha1 ne $null_sha1) {
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$rindex .= "$rmode $rsha1\t$dst_path\0";
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} else {
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push(@working_tree, $dst_path);
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}
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}
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}
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# If $GIT_DIR is not set prior to calling 'git update-index' and
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# 'git checkout-index', then those commands will fail if difftool
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# is called from a directory other than the repo root.
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my $must_unset_git_dir = 0;
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if (not defined($ENV{GIT_DIR})) {
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$must_unset_git_dir = 1;
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$ENV{GIT_DIR} = $repo_path;
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}
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# Populate the left and right directories based on each index file
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my ($inpipe, $ctx);
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$ENV{GIT_INDEX_FILE} = "$tmpdir/lindex";
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($inpipe, $ctx) = $repo->command_input_pipe(qw/update-index -z --index-info/);
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print($inpipe $lindex);
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$repo->command_close_pipe($inpipe, $ctx);
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2012-07-23 03:57:08 +00:00
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my $rc = system('git', 'checkout-index', '--all', "--prefix=$ldir/");
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2012-04-23 18:23:41 +00:00
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exit($rc | ($rc >> 8)) if ($rc != 0);
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$ENV{GIT_INDEX_FILE} = "$tmpdir/rindex";
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($inpipe, $ctx) = $repo->command_input_pipe(qw/update-index -z --index-info/);
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print($inpipe $rindex);
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$repo->command_close_pipe($inpipe, $ctx);
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$rc = system('git', 'checkout-index', '--all', "--prefix=$rdir/");
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exit($rc | ($rc >> 8)) if ($rc != 0);
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# If $GIT_DIR was explicitly set just for the update/checkout
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# commands, then it should be unset before continuing.
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delete($ENV{GIT_DIR}) if ($must_unset_git_dir);
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delete($ENV{GIT_INDEX_FILE});
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# Changes in the working tree need special treatment since they are
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# not part of the index
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for my $file (@working_tree) {
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my $dir = dirname($file);
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unless (-d "$rdir/$dir") {
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mkpath("$rdir/$dir") or die $!;
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}
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2012-07-23 06:05:30 +00:00
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if ($symlinks) {
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symlink("$workdir/$file", "$rdir/$file") or die $!;
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} else {
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copy("$workdir/$file", "$rdir/$file") or die $!;
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my $mode = stat("$workdir/$file")->mode;
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chmod($mode, "$rdir/$file") or die $!;
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}
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2012-04-23 18:23:41 +00:00
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}
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# Changes to submodules require special treatment. This loop writes a
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# temporary file to both the left and right directories to show the
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# change in the recorded SHA1 for the submodule.
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for my $path (keys %submodule) {
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if (defined($submodule{$path}{left})) {
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write_to_file("$ldir/$path", "Subproject commit $submodule{$path}{left}");
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}
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if (defined($submodule{$path}{right})) {
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write_to_file("$rdir/$path", "Subproject commit $submodule{$path}{right}");
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}
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}
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# Symbolic links require special treatment. The standard "git diff"
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# shows only the link itself, not the contents of the link target.
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# This loop replicates that behavior.
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for my $path (keys %symlink) {
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if (defined($symlink{$path}{left})) {
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write_to_file("$ldir/$path", $symlink{$path}{left});
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}
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if (defined($symlink{$path}{right})) {
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write_to_file("$rdir/$path", $symlink{$path}{right});
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}
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}
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2012-07-23 03:57:08 +00:00
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return ($ldir, $rdir, @working_tree);
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2012-04-23 18:23:41 +00:00
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}
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sub write_to_file
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{
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my $path = shift;
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my $value = shift;
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# Make sure the path to the file exists
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my $dir = dirname($path);
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unless (-d "$dir") {
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mkpath("$dir") or die $!;
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}
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# If the file already exists in that location, delete it. This
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# is required in the case of symbolic links.
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unlink("$path");
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open(my $fh, '>', "$path") or die $!;
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print($fh $value);
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close($fh);
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}
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2012-07-23 03:57:08 +00:00
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sub main
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{
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# parse command-line options. all unrecognized options and arguments
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# are passed through to the 'git diff' command.
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2012-07-23 03:57:09 +00:00
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my %opts = (
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difftool_cmd => undef,
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dirdiff => undef,
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extcmd => undef,
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gui => undef,
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help => undef,
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prompt => undef,
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2012-07-23 06:05:30 +00:00
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symlinks => $^O ne 'MSWin32' && $^O ne 'msys',
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2012-07-23 03:57:09 +00:00
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tool_help => undef,
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);
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GetOptions('g|gui!' => \$opts{gui},
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'd|dir-diff' => \$opts{dirdiff},
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'h' => \$opts{help},
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'prompt!' => \$opts{prompt},
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'y' => sub { $opts{prompt} = 0; },
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2012-07-23 06:05:30 +00:00
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'symlinks' => \$opts{symlinks},
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'no-symlinks' => sub { $opts{symlinks} = 0; },
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2012-07-23 03:57:09 +00:00
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't|tool:s' => \$opts{difftool_cmd},
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'tool-help' => \$opts{tool_help},
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'x|extcmd:s' => \$opts{extcmd});
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if (defined($opts{help})) {
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2012-07-23 03:57:08 +00:00
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usage(0);
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2009-01-16 08:00:02 +00:00
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}
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2012-07-23 03:57:09 +00:00
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if (defined($opts{tool_help})) {
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2012-07-23 03:57:08 +00:00
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print_tool_help();
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2012-03-22 19:52:16 +00:00
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}
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2012-07-23 03:57:09 +00:00
|
|
|
if (defined($opts{difftool_cmd})) {
|
|
|
|
if (length($opts{difftool_cmd}) > 0) {
|
|
|
|
$ENV{GIT_DIFF_TOOL} = $opts{difftool_cmd};
|
2012-07-23 03:57:08 +00:00
|
|
|
} else {
|
|
|
|
print "No <tool> given for --tool=<tool>\n";
|
|
|
|
usage(1);
|
|
|
|
}
|
|
|
|
}
|
2012-07-23 03:57:09 +00:00
|
|
|
if (defined($opts{extcmd})) {
|
|
|
|
if (length($opts{extcmd}) > 0) {
|
|
|
|
$ENV{GIT_DIFFTOOL_EXTCMD} = $opts{extcmd};
|
2012-07-23 03:57:08 +00:00
|
|
|
} else {
|
|
|
|
print "No <cmd> given for --extcmd=<cmd>\n";
|
|
|
|
usage(1);
|
|
|
|
}
|
|
|
|
}
|
2012-07-23 03:57:09 +00:00
|
|
|
if ($opts{gui}) {
|
|
|
|
my $guitool = Git::config('diff.guitool');
|
2012-07-23 03:57:08 +00:00
|
|
|
if (length($guitool) > 0) {
|
|
|
|
$ENV{GIT_DIFF_TOOL} = $guitool;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
# In directory diff mode, 'git-difftool--helper' is called once
|
|
|
|
# to compare the a/b directories. In file diff mode, 'git diff'
|
|
|
|
# will invoke a separate instance of 'git-difftool--helper' for
|
|
|
|
# each file that changed.
|
2012-07-23 03:57:09 +00:00
|
|
|
if (defined($opts{dirdiff})) {
|
2012-07-23 06:05:30 +00:00
|
|
|
dir_diff($opts{extcmd}, $opts{symlinks});
|
2012-07-23 03:57:08 +00:00
|
|
|
} else {
|
2012-07-23 03:57:09 +00:00
|
|
|
file_diff($opts{prompt});
|
2012-03-22 19:52:16 +00:00
|
|
|
}
|
|
|
|
}
|
2012-04-23 18:23:41 +00:00
|
|
|
|
2012-07-23 03:57:08 +00:00
|
|
|
sub dir_diff
|
|
|
|
{
|
2012-07-23 06:05:30 +00:00
|
|
|
my ($extcmd, $symlinks) = @_;
|
2012-07-23 03:57:08 +00:00
|
|
|
|
|
|
|
my $rc;
|
|
|
|
my $repo = Git->repository();
|
|
|
|
|
|
|
|
my $workdir = find_worktree($repo);
|
2012-07-23 06:05:30 +00:00
|
|
|
my ($a, $b, @worktree) = setup_dir_diff($repo, $workdir, $symlinks);
|
2012-04-23 18:23:41 +00:00
|
|
|
if (defined($extcmd)) {
|
|
|
|
$rc = system($extcmd, $a, $b);
|
2012-03-22 19:52:16 +00:00
|
|
|
} else {
|
2012-04-23 18:23:41 +00:00
|
|
|
$ENV{GIT_DIFFTOOL_DIRDIFF} = 'true';
|
|
|
|
$rc = system('git', 'difftool--helper', $a, $b);
|
2010-12-14 18:27:48 +00:00
|
|
|
}
|
2009-01-16 08:00:02 +00:00
|
|
|
|
2012-04-23 18:23:41 +00:00
|
|
|
exit($rc | ($rc >> 8)) if ($rc != 0);
|
|
|
|
|
|
|
|
# If the diff including working copy files and those
|
|
|
|
# files were modified during the diff, then the changes
|
2012-07-23 06:05:30 +00:00
|
|
|
# should be copied back to the working tree.
|
|
|
|
# Do not copy back files when symlinks are used and the
|
|
|
|
# external tool did not replace the original link with a file.
|
|
|
|
for my $file (@worktree) {
|
|
|
|
next if $symlinks && -l "$b/$file";
|
|
|
|
if (-f "$b/$file" && compare("$b/$file", "$workdir/$file")) {
|
2012-07-19 08:27:09 +00:00
|
|
|
copy("$b/$file", "$workdir/$file") or die $!;
|
2012-07-23 06:05:30 +00:00
|
|
|
my $mode = stat("$b/$file")->mode;
|
|
|
|
chmod($mode, "$workdir/$file") or die $!;
|
2012-07-19 08:27:09 +00:00
|
|
|
}
|
2012-04-23 18:23:41 +00:00
|
|
|
}
|
2012-07-23 06:05:30 +00:00
|
|
|
exit(0);
|
2012-07-23 03:57:08 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
sub file_diff
|
|
|
|
{
|
|
|
|
my ($prompt) = @_;
|
|
|
|
|
2012-04-23 18:23:41 +00:00
|
|
|
if (defined($prompt)) {
|
|
|
|
if ($prompt) {
|
|
|
|
$ENV{GIT_DIFFTOOL_PROMPT} = 'true';
|
|
|
|
} else {
|
|
|
|
$ENV{GIT_DIFFTOOL_NO_PROMPT} = 'true';
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
$ENV{GIT_PAGER} = '';
|
|
|
|
$ENV{GIT_EXTERNAL_DIFF} = 'git-difftool--helper';
|
|
|
|
|
|
|
|
# ActiveState Perl for Win32 does not implement POSIX semantics of
|
|
|
|
# exec* system call. It just spawns the given executable and finishes
|
|
|
|
# the starting program, exiting with code 0.
|
|
|
|
# system will at least catch the errors returned by git diff,
|
|
|
|
# allowing the caller of git difftool better handling of failures.
|
|
|
|
my $rc = system('git', 'diff', @ARGV);
|
|
|
|
exit($rc | ($rc >> 8));
|
|
|
|
}
|
2012-07-23 03:57:08 +00:00
|
|
|
|
|
|
|
main();
|