can_diff () {
	return 1
}

merge_cmd () {
	if $base_present
	then
		touch "$BACKUP"
		"$merge_tool_path" \
			-base:"$BASE" -mine:"$LOCAL" \
			-theirs:"$REMOTE" -merged:"$MERGED"
		check_unchanged
	else
		echo "$merge_tool_path cannot be used without a base" 1>&2
		return 1
	fi
}

translate_merge_tool_path() {
	if type tortoisegitmerge >/dev/null 2>/dev/null
	then
		echo tortoisegitmerge
	else
		echo tortoisemerge
	fi
}