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See also https://github.com/ilyagr/tangled-core
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import ( "fmt" "strings"
"github.com/bluekeyes/go-gitdiff/gitdiff" "tangled.sh/tangled.sh/core/types")
type InterdiffResult struct { Files []*InterdiffFile}
func (i *InterdiffResult) AffectedFiles() []string { files := make([]string, len(i.Files)) for _, f := range i.Files { files = append(files, f.Name) } return files}
func (i *InterdiffResult) String() string { var b strings.Builder for _, f := range i.Files { b.WriteString(f.String()) b.WriteString("\n") }
return b.String()}
type InterdiffFile struct { *gitdiff.File Name string Status InterdiffFileStatus}
func (s *InterdiffFile) Split() *types.SplitDiff { fragments := make([]types.SplitFragment, len(s.TextFragments))
for i, fragment := range s.TextFragments { leftLines, rightLines := types.SeparateLines(fragment)
fragments[i] = types.SplitFragment{ Header: fragment.Header(), LeftLines: leftLines, RightLines: rightLines, } }
return &types.SplitDiff{ Name: s.Id(), TextFragments: fragments, }}
// used by html elements as a unique ID for hrefsfunc (s *InterdiffFile) Id() string { return s.Name}
func (s *InterdiffFile) String() string { var b strings.Builder b.WriteString(s.Status.String()) b.WriteString(" ")
if s.File != nil { b.WriteString(bestName(s.File)) b.WriteString("\n") b.WriteString(s.File.String()) }
return b.String()}
type InterdiffFileStatus struct { StatusKind StatusKind Error error}
func (s *InterdiffFileStatus) String() string { kind := s.StatusKind.String() if s.Error != nil { return fmt.Sprintf("%s [%s]", kind, s.Error.Error()) } else { return kind }}
func (s *InterdiffFileStatus) IsOk() bool { return s.StatusKind == StatusOk}
func (s *InterdiffFileStatus) IsUnchanged() bool { return s.StatusKind == StatusUnchanged}
func (s *InterdiffFileStatus) IsOnlyInOne() bool { return s.StatusKind == StatusOnlyInOne}
func (s *InterdiffFileStatus) IsOnlyInTwo() bool { return s.StatusKind == StatusOnlyInTwo}
func (s *InterdiffFileStatus) IsRebased() bool { return s.StatusKind == StatusRebased}
func (s *InterdiffFileStatus) IsError() bool { return s.StatusKind == StatusError}
type StatusKind int
func (k StatusKind) String() string { switch k { case StatusOnlyInOne: return "only in one" case StatusOnlyInTwo: return "only in two" case StatusUnchanged: return "unchanged" case StatusRebased: return "rebased" case StatusError: return "error" default: return "changed" }}
const ( StatusOk StatusKind = iota StatusOnlyInOne StatusOnlyInTwo StatusUnchanged StatusRebased StatusError)
func interdiffFiles(f1, f2 *gitdiff.File) *InterdiffFile { re1 := CreatePreImage(f1) re2 := CreatePreImage(f2)
interdiffFile := InterdiffFile{ Name: bestName(f1), }
merged, err := re1.Merge(&re2) if err != nil { interdiffFile.Status = InterdiffFileStatus{ StatusKind: StatusRebased, Error: err, } return &interdiffFile }
rev1, err := merged.Apply(f1) if err != nil { interdiffFile.Status = InterdiffFileStatus{ StatusKind: StatusError, Error: err, } return &interdiffFile }
rev2, err := merged.Apply(f2) if err != nil { interdiffFile.Status = InterdiffFileStatus{ StatusKind: StatusError, Error: err, } return &interdiffFile }
diff, err := Unified(rev1, bestName(f1), rev2, bestName(f2)) if err != nil { interdiffFile.Status = InterdiffFileStatus{ StatusKind: StatusError, Error: err, } return &interdiffFile }
parsed, _, err := gitdiff.Parse(strings.NewReader(diff)) if err != nil { interdiffFile.Status = InterdiffFileStatus{ StatusKind: StatusError, Error: err, } return &interdiffFile }
if len(parsed) != 1 { // files are identical? interdiffFile.Status = InterdiffFileStatus{ StatusKind: StatusUnchanged, } return &interdiffFile }
if interdiffFile.Status.StatusKind == StatusOk { interdiffFile.File = parsed[0] }
return &interdiffFile}
func Interdiff(patch1, patch2 []*gitdiff.File) *InterdiffResult { fileToIdx1 := make(map[string]int) fileToIdx2 := make(map[string]int) visited := make(map[string]struct{}) var result InterdiffResult
for idx, f := range patch1 { fileToIdx1[bestName(f)] = idx }
for idx, f := range patch2 { fileToIdx2[bestName(f)] = idx }
for _, f1 := range patch1 { var interdiffFile *InterdiffFile
fileName := bestName(f1) if idx, ok := fileToIdx2[fileName]; ok { f2 := patch2[idx]
// we have f1 and f2, calculate interdiff interdiffFile = interdiffFiles(f1, f2) } else { // only in patch 1, this change would have to be "inverted" to dissapear // from patch 2, so we reverseDiff(f1) reverseDiff(f1)
interdiffFile = &InterdiffFile{ File: f1, Name: fileName, Status: InterdiffFileStatus{ StatusKind: StatusOnlyInOne, }, } }
result.Files = append(result.Files, interdiffFile) visited[fileName] = struct{}{} }
// for all files in patch2 that remain unvisited; we can just add them into the output for _, f2 := range patch2 { fileName := bestName(f2) if _, ok := visited[fileName]; ok { continue }
result.Files = append(result.Files, &InterdiffFile{ File: f2, Name: fileName, Status: InterdiffFileStatus{ StatusKind: StatusOnlyInTwo, }, }) }
return &result}