diff_cmd () {
        "$merge_tool_path" --default --mode=diff2 "$LOCAL" "$REMOTE"
}

merge_cmd () {
        touch "$BACKUP"
        if $base_present
        then
                "$merge_tool_path" "$BASE" "$LOCAL" "$REMOTE" \
                        --default --mode=merge3 --to="$MERGED"
        else
                "$merge_tool_path" "$LOCAL" "$REMOTE" \
                        --default --mode=merge2 --to="$MERGED"
        fi
        check_unchanged
}