diff_cmd () {
        "$merge_tool_path" -u -e "$LOCAL" "$REMOTE"
        return 0
}

merge_cmd () {
        # mergetool.winmerge.trustExitCode is implicitly false.
        # touch $BACKUP so that we can check_unchanged.
        touch "$BACKUP"
        "$merge_tool_path" -u -e -dl Local -dr Remote \
                "$LOCAL" "$REMOTE" "$MERGED"
        check_unchanged
}

translate_merge_tool_path() {
        # Use WinMergeU.exe if it exists in $PATH
        if type -p WinMergeU.exe >/dev/null 2>&1
        then
                printf WinMergeU.exe
                return
        fi

        # Look for WinMergeU.exe in the typical locations
        winmerge_exe="WinMerge/WinMergeU.exe"
        for directory in $(env | grep -Ei '^PROGRAM(FILES(\(X86\))?|W6432)=' |
                cut -d '=' -f 2- | sort -u)
        do
                if test -n "$directory" && test -x "$directory/$winmerge_exe"
                then
                        printf '%s' "$directory/$winmerge_exe"
                        return
                fi
        done

        printf WinMergeU.exe
}