Teach difftool's --dir-diff mode to use symlinks to represent
files from the working copy, and make it the default behavior
for the non-Windows platforms.
Using symlinks is simpler and safer since we do not need to
worry about copying files back into the worktree.
The old behavior is still available as --no-symlinks.
Signed-off-by: David Aguilar <davvid@xxxxxxxxx>
---
Documentation/git-difftool.txt | 8 ++++++++
git-difftool.perl | 30 +++++++++++++++++++++++-------
2 files changed, 31 insertions(+), 7 deletions(-)
diff --git a/Documentation/git-difftool.txt b/Documentation/git-difftool.txt
index 31fc2e3..313d54e 100644
--- a/Documentation/git-difftool.txt
+++ b/Documentation/git-difftool.txt
@@ -66,6 +66,14 @@ of the diff post-image. `$MERGED` is the name of the file which is
being compared. `$BASE` is provided for compatibility
with custom merge tool commands and has the same value as `$MERGED`.
+--symlinks::
+--no-symlinks::
+ 'git difftool''s default behavior is create symlinks to the
+ working tree when run in `--dir-diff` mode.
++
+ Specifying `--no-symlinks` instructs 'git difftool' to create
+ copies instead. `--no-symlinks` is the default on Windows.
+
--tool-help::
Print a list of diff tools that may be used with `--tool`.
diff --git a/git-difftool.perl b/git-difftool.perl
index 2ae344c..b8f8057 100755
--- a/git-difftool.perl
+++ b/git-difftool.perl
@@ -92,7 +92,7 @@ sub print_tool_help
sub setup_dir_diff
{
- my ($repo, $workdir) = @_;
+ my ($repo, $workdir, $symlinks) = @_;
# Run the diff; exit immediately if no diff found
# 'Repository' and 'WorkingCopy' must be explicitly set to insure that
@@ -209,8 +209,13 @@ sub setup_dir_diff
unless (-d "$rdir/$dir") {
mkpath("$rdir/$dir") or die $!;
}
- copy("$workdir/$file", "$rdir/$file") or die $!;
- chmod(stat("$workdir/$file")->mode, "$rdir/$file") or die $!;
+ if ($symlinks) {
+ symlink("$workdir/$file", "$rdir/$file") or die $!;
+ } else {
+ copy("$workdir/$file", "$rdir/$file") or die $!;
+ my $mode = stat("$workdir/$file")->mode;
+ chmod($mode, "$rdir/$file") or die $!;
+ }
}
# Changes to submodules require special treatment. This loop writes a
@@ -271,6 +276,7 @@ sub main
gui => undef,
help => undef,
prompt => undef,
+ symlinks => $^O ne 'MSWin32' && $^O ne 'msys',
tool_help => undef,
);
GetOptions('g|gui!' => \$opts{gui},
@@ -278,6 +284,8 @@ sub main
'h' => \$opts{help},
'prompt!' => \$opts{prompt},
'y' => sub { $opts{prompt} = 0; },
+ 'symlinks' => \$opts{symlinks},
+ 'no-symlinks' => sub { $opts{symlinks} = 0; },
't|tool:s' => \$opts{difftool_cmd},
'tool-help' => \$opts{tool_help},
'x|extcmd:s' => \$opts{extcmd});
@@ -316,7 +324,7 @@ sub main
# will invoke a separate instance of 'git-difftool--helper' for
# each file that changed.
if (defined($opts{dirdiff})) {
- dir_diff($opts{extcmd});
+ dir_diff($opts{extcmd}, $opts{symlinks});
} else {
file_diff($opts{prompt});
}
@@ -324,13 +332,13 @@ sub main
sub dir_diff
{
- my ($extcmd) = @_;
+ my ($extcmd, $symlinks) = @_;
my $rc;
my $repo = Git->repository();
my $workdir = find_worktree($repo);
- my ($a, $b, @working_tree) = setup_dir_diff($repo, $workdir);
+ my ($a, $b, @working_tree) = setup_dir_diff($repo, $workdir, $symlinks);
if (defined($extcmd)) {
$rc = system($extcmd, $a, $b);
} else {
@@ -340,15 +348,23 @@ sub dir_diff
exit($rc | ($rc >> 8)) if ($rc != 0);
+ # Do not copy back files when symlinks are used
+ if ($symlinks) {
+ exit(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 $!;
+ my $mode = stat("$b/$file")->mode;
+ chmod($mode, "$workdir/$file") or die $!;
}
}
+ exit(0);
}
sub file_diff
--
1.7.11.2.255.g5f133da
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