Method updateDiff

internal/buffer/buffer.go:1328–1373

(synchronous bool)

}

func (b *Buffer) updateDiff(synchronous bool) {
	b.diffLock.Lock()
	defer b.diffLock.Unlock()

	b.diff = make(map[int]DiffStatus)

	if b.diffBase == nil {
		return
	}

	differ := dmp.New()

	if !synchronous {
		b.Lock()
	}
	bytes := b.Bytes()
	if !synchronous {
		b.Unlock()
	}

	baseRunes, bufferRunes, _ := differ.DiffLinesToRunes(string(b.diffBase), string(bytes))
	diffs := differ.DiffMainRunes(baseRunes, bufferRunes, false)
	lineN := 0

	for _, diff := range diffs {
		lineCount := len([]rune(diff.Text))

		switch diff.Type {
		case dmp.DiffEqual:
			lineN += lineCount
		case dmp.DiffInsert:
			var status DiffStatus
			if b.diff[lineN] == DSDeletedAbove {
				status = DSModified
			} else {
				status = DSAdded
			}
			for i := 0; i < lineCount; i++ {
				b.diff[lineN] = status
				lineN++
			}
		case dmp.DiffDelete:
			b.diff[lineN] = DSDeletedAbove
		}
	}
}

// UpdateDiff computes the diff between the diff base and the buffer content.
// The update may be performed synchronously or asynchronously.