[PATCH] Open external merge tool with original file extensions in all three files

This required to be able to use syntax highlighting in meld during conflicts resolution.
Before this change, two merged versions of file with a conflict were open with temporal extensions .LOCAL.$$ and REMOTE.$$
This way they were not recognized as a code files.

Signed-off-by: Pini Reznik <redacted>
---
 git-mergetool.sh |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/git-mergetool.sh b/git-mergetool.sh
index 5587c5e..4c15d22 100755
--- a/git-mergetool.sh
+++ b/git-mergetool.sh

@@ -152,10 +152,11 @@ merge_file () {
 	exit 1
     fi
 
-    BACKUP="$path.BACKUP.$$"
-    LOCAL="$path.LOCAL.$$"
-    REMOTE="$path.REMOTE.$$"
-    BASE="$path.BASE.$$"
+    extension=`echo $path | awk -F \. '{print $NF}'`
+    BACKUP="$path.BACKUP.$$.${extension}"
+    LOCAL="$path.LOCAL.$$.${extension}"
+    REMOTE="$path.REMOTE.$$.${extension}"
+    BASE="$path.BASE.$$.${extension}"
 
     mv -- "$path" "$BACKUP"
     cp -- "$BACKUP" "$path"

-- 
1.5.3.5

Pini Reznik [off-list ref] writes:

This required to be able to use syntax highlighting in meld during
conflicts resolution....

+    extension=`echo $path | awk -F \. '{print $NF}'`
+    BACKUP="$path.BACKUP.$$.${extension}"
+    LOCAL="$path.LOCAL.$$.${extension}"
+    REMOTE="$path.REMOTE.$$.${extension}"
+    BASE="$path.BASE.$$.${extension}"

I had to wonder what would happen in these cases:

 * path = "a/b/c/d"
 * path = "a/b.c/d"

I also think spawning awk for this is way overkill.