From 2e8af7e42b15d4f2d573329ea2593a19f45f18d3 Mon Sep 17 00:00:00 2001
From: David Aguilar <davvid@gmail.com>
Date: Mon, 6 Apr 2009 01:31:20 -0700
Subject: [PATCH] difftool: remove the backup file feature

Most users find the backup file feature annoying and there's no
need for it since diff is supposed to be a read-only operation.

Signed-off-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 contrib/difftool/git-difftool-helper | 34 +---------------------------
 1 file changed, 1 insertion(+), 33 deletions(-)

diff --git a/contrib/difftool/git-difftool-helper b/contrib/difftool/git-difftool-helper
index ef684b6f68..e74a2747b6 100755
--- a/contrib/difftool/git-difftool-helper
+++ b/contrib/difftool/git-difftool-helper
@@ -9,31 +9,7 @@
 
 # Set GIT_DIFFTOOL_NO_PROMPT to bypass the per-file prompt.
 should_prompt () {
-	! test -n "$GIT_DIFFTOOL_NO_PROMPT"
-}
-
-# Should we keep the backup .orig file?
-keep_backup_mode="$(git config --bool merge.keepBackup || echo true)"
-keep_backup () {
-	test "$keep_backup_mode" = "true"
-}
-
-# This function manages the backup .orig file.
-# A backup $MERGED.orig file is created if changes are detected.
-cleanup_temp_files () {
-	if test -n "$MERGED"; then
-		if keep_backup && test "$MERGED" -nt "$BACKUP"; then
-			test -f "$BACKUP" && mv -- "$BACKUP" "$MERGED.orig"
-		else
-			rm -f -- "$BACKUP"
-		fi
-	fi
-}
-
-# This is called when users Ctrl-C out of git-difftool-helper
-sigint_handler () {
-	cleanup_temp_files
-	exit 1
+	test -z "$GIT_DIFFTOOL_NO_PROMPT"
 }
 
 # This function prepares temporary files and launches the appropriate
@@ -47,12 +23,6 @@ launch_merge_tool () {
 	LOCAL="$2"
 	REMOTE="$3"
 	BASE="$1"
-	ext="$$$(expr "$MERGED" : '.*\(\.[^/]*\)$')"
-	BACKUP="$MERGED.BACKUP.$ext"
-
-	# Create and ensure that we clean up $BACKUP
-	test -f "$MERGED" && cp -- "$MERGED" "$BACKUP"
-	trap sigint_handler INT
 
 	# $LOCAL and $REMOTE are temporary files so prompt
 	# the user with the real $MERGED name before launching $merge_tool.
@@ -120,8 +90,6 @@ launch_merge_tool () {
 		fi
 		;;
 	esac
-
-	cleanup_temp_files
 }
 
 # Verifies that (difftool|mergetool).<tool>.cmd exists
-- 
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