mergetool: print an appropriate warning if merge.tool is unknown

Also add support for vimdiff

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/git-mergetool.sh b/git-mergetool.sh
index 563c5c048f5f434b4208750de9f7b11aced36bfd..7942fd0b6490760b09248b961b38adb89ede1adb 100755 (executable)
--- a/git-mergetool.sh
+++ b/git-mergetool.sh
@@ -288,10 +288,15 @@ done
 
 if test -z "$merge_tool"; then
     merge_tool=`git-config merge.tool`
-    if test $merge_tool = kdiff3 -o $merge_tool = tkdiff -o \
-       $merge_tool = xxdiff -o $merge_tool = meld ; then
-       unset merge_tool
-    fi
+    case "$merge_tool" in
+       kdiff3 | tkdiff | xxdiff | meld | emerge | vimdiff)
+           ;; # happy
+       *)
+           echo >&2 "git config option merge.tool set to unknown tool: $merge_tool"
+           echo >&2 "Resetting to default..."
+           unset merge_tool
+           ;;
+    esac
 fi
 
 if test -z "$merge_tool" ; then