[PATCH 1/2] Feature Request: user defined suffix for temp files created by git-mergetool

[Josef Ridky <jridky@redhat.com>]

This is the first of two variant for request to add option to change
suffix of name of temporary files generated by git mergetool. This
change is requested for cases, when is git mergetool used for local
comparision between two version of same package during package rebase.

Signed-off-by: Josef Ridky <jridky@redhat.com>
---
 Documentation/git-mergetool.txt |  7 ++++++-
 git-mergetool.sh                | 23 ++++++++++++++++++-----
 2 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/Documentation/git-mergetool.txt b/Documentation/git-mergetool.txt
index e846c2e..a212cef 100644
--- a/Documentation/git-mergetool.txt
+++ b/Documentation/git-mergetool.txt
@@ -8,7 +8,7 @@ git-mergetool - Run merge conflict resolution tools to resolve merge conflicts
 SYNOPSIS
 --------
 [verse]
-'git mergetool' [--tool=<tool>] [-y | --[no-]prompt] [<file>...]
+'git mergetool' [--tool=<tool>] [-y | --[no-]prompt] [-l | --local] [<file>...]
 
 DESCRIPTION
 -----------
@@ -79,6 +79,11 @@ success of the resolution after the custom tool has exited.
 	Prompt before each invocation of the merge resolution program
 	to give the user a chance to skip the path.
 
+-l::
+--local::
+	Change suffix of name of temporary files generated by git
+	mergetool from `_REMOTE_` and `_LOCAL_` to `_OLD_` and `_NEW_`.
+
 TEMPORARY FILES
 ---------------
 `git mergetool` creates `*.orig` backup files while resolving merges.
diff --git a/git-mergetool.sh b/git-mergetool.sh
index bf86270..1e04368 100755
--- a/git-mergetool.sh
+++ b/git-mergetool.sh
@@ -8,10 +8,11 @@
 # at the discretion of Junio C Hamano.
 #
 
-USAGE='[--tool=tool] [--tool-help] [-y|--no-prompt|--prompt] [file to merge] ...'
+USAGE='[--tool=tool] [--tool-help] [-y|--no-prompt|--prompt] [-l|--local] [file to merge] ...'
 SUBDIRECTORY_OK=Yes
 NONGIT_OK=Yes
 OPTIONS_SPEC=
+LOCAL_MODE=false
 TOOL_MODE=merge
 . git-sh-setup
 . git-mergetool--lib
@@ -271,10 +272,19 @@ merge_file () {
 		BASE=${BASE##*/}
 	fi
 
-	BACKUP="$MERGETOOL_TMPDIR/${BASE}_BACKUP_$$$ext"
-	LOCAL="$MERGETOOL_TMPDIR/${BASE}_LOCAL_$$$ext"
-	REMOTE="$MERGETOOL_TMPDIR/${BASE}_REMOTE_$$$ext"
-	BASE="$MERGETOOL_TMPDIR/${BASE}_BASE_$$$ext"
+	if test "$LOCAL_MODE"
+	then
+
+		BACKUP="$MERGETOOL_TMPDIR/${BASE}_BACKUP_$$$ext"
+		LOCAL="$MERGETOOL_TMPDIR/${BASE}_NEW_$$$ext"
+		REMOTE="$MERGETOOL_TMPDIR/${BASE}_OLD_$$$ext"
+		BASE="$MERGETOOL_TMPDIR/${BASE}_BASE_$$$ext"
+	else
+		BACKUP="$MERGETOOL_TMPDIR/${BASE}_BACKUP_$$$ext"
+		LOCAL="$MERGETOOL_TMPDIR/${BASE}_LOCAL_$$$ext"
+		REMOTE="$MERGETOOL_TMPDIR/${BASE}_REMOTE_$$$ext"
+		BASE="$MERGETOOL_TMPDIR/${BASE}_BASE_$$$ext"
+	fi
 
 	base_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==1) print $1;}')
 	local_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $1;}')
@@ -396,6 +406,9 @@ do
 	--prompt)
 		prompt=true
 		;;
+	-l|--local)
+		LOCAL_MODE=true
+		;;
 	--)
 		shift
 		break
-- 
2.7.4