Implement 'git stash save --patch'

This adds a hunk-based mode to git-stash.  You can select hunks from
the difference between HEAD and worktree, and git-stash will build a
stash that reflects these changes.  The index state of the stash is
the same as your current index, and we also let --patch imply
--keep-index.

Note that because the selected hunks are rolled back from the worktree
but not the index, the resulting state may appear somewhat confusing
if you had also staged these changes.  This is not entirely
satisfactory, but due to the way stashes are applied, other solutions
would require a change to the stash format.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 12 insertions, 2 deletions

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index 21746d5f28..8f66b825dd 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -76,6 +76,7 @@ my $patch_mode_revision;
 
 sub apply_patch;
 sub apply_patch_for_checkout_commit;
+sub apply_patch_for_stash;
 
 my %patch_modes = (
 	'stage' => {
@@ -87,6 +88,15 @@ my %patch_modes = (
 		PARTICIPLE => 'staging',
 		FILTER => 'file-only',
 	},
+	'stash' => {
+		DIFF => 'diff-index -p HEAD',
+		APPLY => sub { apply_patch 'apply --cached', @_; },
+		APPLY_CHECK => 'apply --cached',
+		VERB => 'Stash',
+		TARGET => '',
+		PARTICIPLE => 'stashing',
+		FILTER => undef,
+	},
 	'reset_head' => {
 		DIFF => 'diff-index -p --cached',
 		APPLY => sub { apply_patch 'apply -R --cached', @_; },
@@ -1493,8 +1503,8 @@ sub process_args {
 						       'checkout_head' : 'checkout_nothead');
 					$arg = shift @ARGV or die "missing --";
 				}
-			} elsif ($1 eq 'stage') {
-				$patch_mode = 'stage';
+			} elsif ($1 eq 'stage' or $1 eq 'stash') {
+				$patch_mode = $1;
 				$arg = shift @ARGV or die "missing --";
 			} else {
 				die "unknown --patch mode: $1";