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See also https://github.com/ilyagr/tangled-core
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import ( "bytes" "fmt" "strings"
"github.com/bluekeyes/go-gitdiff/gitdiff")
type Line struct { LineNumber int64 Content string IsUnknown bool}
func NewLineAt(lineNumber int64, content string) Line { return Line{ LineNumber: lineNumber, Content: content, IsUnknown: false, }}
type Image struct { File string Data []*Line}
func (r *Image) String() string { var i, j int64 var b strings.Builder for { i += 1
if int(j) >= (len(r.Data)) { break }
if r.Data[j].LineNumber == i { // b.WriteString(fmt.Sprintf("%d:", r.Data[j].LineNumber)) b.WriteString(r.Data[j].Content) j += 1 } else { //b.WriteString(fmt.Sprintf("%d:\n", i)) b.WriteString("\n") } }
return b.String()}
func (r *Image) AddLine(line *Line) { r.Data = append(r.Data, line)}
// rebuild the original file from a patchfunc CreatePreImage(file *gitdiff.File) Image { rf := Image{ File: bestName(file), }
for _, fragment := range file.TextFragments { position := fragment.OldPosition for _, line := range fragment.Lines { switch line.Op { case gitdiff.OpContext: rl := NewLineAt(position, line.Line) rf.Data = append(rf.Data, &rl) position += 1 case gitdiff.OpDelete: rl := NewLineAt(position, line.Line) rf.Data = append(rf.Data, &rl) position += 1 case gitdiff.OpAdd: // do nothing here } } }
return rf}
// rebuild the revised file from a patchfunc CreatePostImage(file *gitdiff.File) Image { rf := Image{ File: bestName(file), }
for _, fragment := range file.TextFragments { position := fragment.NewPosition for _, line := range fragment.Lines { switch line.Op { case gitdiff.OpContext: rl := NewLineAt(position, line.Line) rf.Data = append(rf.Data, &rl) position += 1 case gitdiff.OpAdd: rl := NewLineAt(position, line.Line) rf.Data = append(rf.Data, &rl) position += 1 case gitdiff.OpDelete: // do nothing here } } }
return rf}
type MergeError struct { msg string mismatchingLine int64}
func (m MergeError) Error() string { return fmt.Sprintf("%s: %v", m.msg, m.mismatchingLine)}
// best effort merging of two reconstructed filesfunc (this *Image) Merge(other *Image) (*Image, error) { mergedFile := Image{}
var i, j int64
for int(i) < len(this.Data) || int(j) < len(other.Data) { if int(i) >= len(this.Data) { // first file is done; the rest of the lines from file 2 can go in mergedFile.AddLine(other.Data[j]) j++ continue }
if int(j) >= len(other.Data) { // first file is done; the rest of the lines from file 2 can go in mergedFile.AddLine(this.Data[i]) i++ continue }
line1 := this.Data[i] line2 := other.Data[j]
if line1.LineNumber == line2.LineNumber { if line1.Content != line2.Content { return nil, MergeError{ msg: "mismatching lines, this patch might have undergone rebase", mismatchingLine: line1.LineNumber, } } else { mergedFile.AddLine(line1) } i++ j++ } else if line1.LineNumber < line2.LineNumber { mergedFile.AddLine(line1) i++ } else { mergedFile.AddLine(line2) j++ } }
return &mergedFile, nil}
func (r *Image) Apply(patch *gitdiff.File) (string, error) { original := r.String() var buffer bytes.Buffer reader := strings.NewReader(original)
err := gitdiff.Apply(&buffer, reader, patch) if err != nil { return "", err }
return buffer.String(), nil}