// Copyright 2020 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.

package edit

import (
	"fmt"
	"io"

	"github.com/sergi/go-diff/diffmatchpatch"
)

// ShowDiff write diff result into the Writer.
// return false if there's no diff.
func ShowDiff(t1 string, t2 string, w io.Writer) {
	dmp := diffmatchpatch.New()
	diffs := dmp.DiffMain(t1, t2, false)
	diffs = dmp.DiffCleanupSemantic(diffs)

	fmt.Fprint(w, dmp.DiffPrettyText(diffs))
}