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#!/usr/bin/perl
# Copyright (c) 2009, 2010 David Aguilar
# Copyright (c) 2012 Tim Henigan
#
# This is a wrapper around the GIT_EXTERNAL_DIFF-compatible
# git-difftool--helper script.
#
# This script exports GIT_EXTERNAL_DIFF and GIT_PAGER for use by git.
# The GIT_DIFF* variables are exported for use by git-difftool--helper.
#
# Any arguments that are unknown to this script are forwarded to 'git diff'.

use 5.008;
use strict;
use warnings;
use File::Basename qw(dirname);
use File::Copy;
use File::Compare;
use File::Find;
use File::stat;
use File::Path qw(mkpath);
use File::Temp qw(tempdir);
use Getopt::Long qw(:config pass_through);
use Git;

my @tools;
my @working_tree;
my $rc;
my $repo = Git->repository();
my $repo_path = $repo->repo_path();

sub usage
{
my $exitcode = shift;
print << 'USAGE';
usage: git difftool [-t|--tool=<tool>] [--tool-help]
                    [-x|--extcmd=<cmd>]
                    [-g|--gui] [--no-gui]
                    [--prompt] [-y|--no-prompt]
                    [-d|--dir-diff]
                    ['git diff' options]
USAGE
exit($exitcode);
}

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 filter_tool_scripts
{
if (-d $_) {
if ($_ ne ".") {
# Ignore files in subdirectories
$File::Find::prune = 1;
}
} else {
if ((-f $_) && ($_ ne "defaults")) {
push(@tools, $_);
}
}
}

sub print_tool_help
{
my ($cmd, @found, @notfound);
my $gitpath = Git::exec_path();

find(\&filter_tool_scripts, "$gitpath/mergetools");

foreach my $tool (@tools) {
$cmd = "TOOL_MODE=diff";
$cmd .= ' && . "$(git --exec-path)/git-mergetool--lib"';
$cmd .= " && get_merge_tool_path $tool >/dev/null 2>&1";
$cmd .= " && can_diff >/dev/null 2>&1";
if (system('sh', '-c', $cmd) == 0) {
push(@found, $tool);
} else {
push(@notfound, $tool);
}
}

print "'git difftool --tool=<tool>' may be set to one of the following:\n";
print "\t$_\n" for (sort(@found));

print "\nThe following tools are valid, but not currently available:\n";
print "\t$_\n" for (sort(@notfound));

print "\nNOTE: Some of the tools listed above only work in a windowed\n";
print "environment. If run in a terminal-only session, they will fail.\n";

exit(0);
}

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);
}

# parse command-line options. all unrecognized options and arguments
# are passed through to the 'git diff' command.
my ($difftool_cmd, $dirdiff, $extcmd, $gui, $help, $prompt, $tool_help);
GetOptions('g|gui!' => \$gui,
'd|dir-diff' => \$dirdiff,
'h' => \$help,
'prompt!' => \$prompt,
'y' => sub { $prompt = 0; },
't|tool:s' => \$difftool_cmd,
'tool-help' => \$tool_help,
'x|extcmd:s' => \$extcmd);

if (defined($help)) {
usage(0);
}
if (defined($tool_help)) {
print_tool_help();
}
if (defined($difftool_cmd)) {
if (length($difftool_cmd) > 0) {
$ENV{GIT_DIFF_TOOL} = $difftool_cmd;
} else {
print "No <tool> given for --tool=<tool>\n";
usage(1);
}
}
if (defined($extcmd)) {
if (length($extcmd) > 0) {
$ENV{GIT_DIFFTOOL_EXTCMD} = $extcmd;
} else {
print "No <cmd> given for --extcmd=<cmd>\n";
usage(1);
}
}
if ($gui) {
my $guitool = '';
$guitool = Git::config('diff.guitool');
if (length($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.
if (defined($dirdiff)) {
my ($a, $b) = setup_dir_diff();
if (defined($extcmd)) {
$rc = system($extcmd, $a, $b);
} else {
$ENV{GIT_DIFFTOOL_DIRDIFF} = 'true';
$rc = system('git', 'difftool--helper', $a, $b);
}

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
# should be copied back to the working tree
for my $file (@working_tree) {
if (-e "$b/$file" && compare("$b/$file", "$workdir/$file")) {
copy("$b/$file", "$workdir/$file") or die $!;
chmod(stat("$b/$file")->mode, "$workdir/$file") or die $!;
}
}
} else {
if (defined($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));
}
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