diff_cmd () {
	"$merge_tool_path" "$LOCAL" "$REMOTE" | cat
}

merge_cmd () {
	touch "$BACKUP"
	if $base_present
	then
		"$merge_tool_path" "$LOCAL" "$REMOTE" \
			-ancestor "$BASE" -merge "$MERGED" | cat
	else
		"$merge_tool_path" "$LOCAL" "$REMOTE" \
			-merge "$MERGED" | cat
	fi
	check_unchanged
}