mergetool-lib: call vim in readonly mode for diffs

When [g]vimdiff is called for files which are opened already, the editor
complains about the existing swap file. But we do not want to write
anything when called from difftool. So, make difftool use "-R" for the
vim family. This

- prevents the use of a swap file and
- marks the buffers readonly.

Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-mergetool--lib.sh b/git-mergetool--lib.sh
index 77d4aee20ee5b8b01f9a0e3d1f8dbc9f7fdf3eb9..78ce49e9846e908e0d5b262e2a12c2308ed8ac88 100644 (file)
--- a/git-mergetool--lib.sh
+++ b/git-mergetool--lib.sh
@@ -182,7 +182,7 @@ run_merge_tool () {
                        fi
                        check_unchanged
                else
-                       "$merge_tool_path" -f -d -c "wincmd l" \
+                       "$merge_tool_path" -R -f -d -c "wincmd l" \
                                "$LOCAL" "$REMOTE"
                fi
                ;;
@@ -193,7 +193,7 @@ run_merge_tool () {
                                "$LOCAL" "$MERGED" "$REMOTE"
                        check_unchanged
                else
-                       "$merge_tool_path" -f -d -c "wincmd l" \
+                       "$merge_tool_path" -R -f -d -c "wincmd l" \
                                "$LOCAL" "$REMOTE"
                fi
                ;;