mergetools/meld: Use --help output to detect --output support

[git.git] / mergetools / meld

diff --git a/mergetools/meld b/mergetools/meld
index 73d70ae28ad1e6a5b38e051442e08c26c074bb22..cb672a55192cb44335aa2cbe1f10004bb26d86ff 100644 (file)
--- a/mergetools/meld
+++ b/mergetools/meld
@@ -3,7 +3,30 @@ diff_cmd () {
 }
 
 merge_cmd () {
+       if test -z "${meld_has_output_option:+set}"
+       then
+               check_meld_for_output_version
+       fi
        touch "$BACKUP"
-       "$merge_tool_path" "$LOCAL" "$MERGED" "$REMOTE"
+       if test "$meld_has_output_option" = true
+       then
+               "$merge_tool_path" --output "$MERGED" \
+                       "$LOCAL" "$BASE" "$REMOTE"
+       else
+               "$merge_tool_path" "$LOCAL" "$MERGED" "$REMOTE"
+       fi
        check_unchanged
 }
+
+# Check whether 'meld --output <file>' is supported
+check_meld_for_output_version () {
+       meld_path="$(git config mergetool.meld.path)"
+       meld_path="${meld_path:-meld}"
+
+       if "$meld_path" --help 2>&1 | grep -e --output >/dev/null
+       then
+               meld_has_output_option=true
+       else
+               meld_has_output_option=false
+       fi
+}