[PATCH 1/2] git-submodule.sh: Handle submodules with merge conflicts

[Nicolas Morey-Chaisemartin <nmorey@kalray.eu>]

During a merge with conflict on a submodule, the submodule appears 3 times in git ls-files (stage 1,2,3) which caused the submodule to be used 3 times in git submodule init, sync, update and status command.
This patch filters the results of git ls-files to generate a single entry for conflicting submodules with a 0 SHA1 and 'U' as stage.
After this patch:
- init and sync behave as previously but only once per submodule
- update skips submodule with merge conflicts
- status now display a null SHA1 prefixed by 'U' for submodule with merge conflicts

Signed-off-by: Nicolas Morey-Chaisemartin <nicolas@morey-chaisemartin.com>
---
 git-submodule.sh |   29 ++++++++++++++++++++++++++++-
 1 files changed, 28 insertions(+), 1 deletions(-)

diff --git a/git-submodule.sh b/git-submodule.sh
index 3a13397..7f6b3cf 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -72,7 +72,24 @@ resolve_relative_url ()
 #
 module_list()
 {
-	git ls-files --error-unmatch --stage -- "$@" | sane_grep '^160000 '
+	git ls-files --error-unmatch --stage -- "$@" |
+	perl -e '
+	my %unmerged = ();
+	my ($null_sha1) = ("0" x 40);
+	while (<STDIN>) {
+		chomp;
+		my ($mode, $sha1, $stage, $path) =
+			/^([0-7]+) ([0-9a-f]{40}) ([0-3])\t(.*)$/;
+		next unless $mode eq "160000";
+		if ($stage ne "0") {
+			if (!$unmerged{$path}++) {
+				print "$mode $null_sha1 U\t$path\n";
+			}
+			next;
+		}
+		print "$_\n";
+	}
+	'
 }
 
 #
@@ -427,6 +444,11 @@ cmd_update()
 	module_list "$@" |
 	while read mode sha1 stage path
 	do
+		if test "$stage" = U
+		then
+			echo >&2 "Skipping unmerged submodule $path"
+			continue
+		fi
 		name=$(module_name "$path") || exit
 		url=$(git config submodule."$name".url)
 		update_module=$(git config submodule."$name".update)
@@ -770,6 +792,11 @@ cmd_status()
 		name=$(module_name "$path") || exit
 		url=$(git config submodule."$name".url)
 		displaypath="$prefix$path"
+		if test "$stage" = U
+		then
+			say "U$sha1 $displaypath"
+			continue
+		fi
 		if test -z "$url" || ! test -d "$path"/.git -o -f "$path"/.git
 		then
 			say "-$sha1 $displaypath"
-- 
1.7.4