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import ( "fmt" "os" "os/exec" "regexp" "strings"
"github.com/bluekeyes/go-gitdiff/gitdiff")
type FormatPatch struct { Files []*gitdiff.File *gitdiff.PatchHeader}
// Extracts just the diff from this format-patchfunc (f FormatPatch) Patch() string { var b strings.Builder for _, p := range f.Files { b.WriteString(p.String()) } return b.String()}
func (f FormatPatch) ChangeId() (string, error) { if vals, ok := f.RawHeaders["Change-Id"]; ok && len(vals) == 1 { return vals[0], nil } return "", fmt.Errorf("no change-id found")}
func ExtractPatches(formatPatch string) ([]FormatPatch, error) { patches := splitFormatPatch(formatPatch)
result := []FormatPatch{}
for _, patch := range patches { files, headerStr, err := gitdiff.Parse(strings.NewReader(patch)) if err != nil { return nil, fmt.Errorf("failed to parse patch: %w", err) }
header, err := gitdiff.ParsePatchHeader(headerStr) if err != nil { return nil, fmt.Errorf("failed to parse patch header: %w", err) }
result = append(result, FormatPatch{ Files: files, PatchHeader: header, }) }
return result, nil}
// IsPatchValid checks if the given patch string is valid.// It performs very basic sniffing for either git-diff or git-format-patch// header lines. For format patches, it attempts to extract and validate each one.func IsPatchValid(patch string) bool { if len(patch) == 0 { return false }
lines := strings.Split(patch, "\n") if len(lines) < 2 { return false }
firstLine := strings.TrimSpace(lines[0])
// check if it's a git diff if strings.HasPrefix(firstLine, "diff ") || strings.HasPrefix(firstLine, "--- ") || strings.HasPrefix(firstLine, "Index: ") || strings.HasPrefix(firstLine, "+++ ") || strings.HasPrefix(firstLine, "@@ ") { return true }
// check if it's format-patch if strings.HasPrefix(firstLine, "From ") && strings.Contains(firstLine, " Mon Sep 17 00:00:00 2001") || strings.HasPrefix(firstLine, "From: ") { // ExtractPatches already runs it through gitdiff.Parse so if that errors, // it's safe to say it's broken. patches, err := ExtractPatches(patch) if err != nil { return false } return len(patches) > 0 }
return false}
func IsFormatPatch(patch string) bool { lines := strings.Split(patch, "\n") if len(lines) < 2 { return false }
firstLine := strings.TrimSpace(lines[0]) if strings.HasPrefix(firstLine, "From ") && strings.Contains(firstLine, " Mon Sep 17 00:00:00 2001") { return true }
headerCount := 0 for i := range min(10, len(lines)) { line := strings.TrimSpace(lines[i]) if strings.HasPrefix(line, "From: ") || strings.HasPrefix(line, "Date: ") || strings.HasPrefix(line, "Subject: ") || strings.HasPrefix(line, "commit ") { headerCount++ } }
return headerCount >= 2}
func splitFormatPatch(patchText string) []string { re := regexp.MustCompile(`(?m)^From [0-9a-f]{40} .*$`)
indexes := re.FindAllStringIndex(patchText, -1)
if len(indexes) == 0 { return []string{} }
patches := make([]string, len(indexes))
for i := range indexes { startPos := indexes[i][0] endPos := len(patchText)
if i < len(indexes)-1 { endPos = indexes[i+1][0] }
patches[i] = strings.TrimSpace(patchText[startPos:endPos]) } return patches}
func bestName(file *gitdiff.File) string { if file.IsDelete { return file.OldName } else { return file.NewName }}
// in-place reverse of a difffunc reverseDiff(file *gitdiff.File) { file.OldName, file.NewName = file.NewName, file.OldName file.OldMode, file.NewMode = file.NewMode, file.OldMode file.BinaryFragment, file.ReverseBinaryFragment = file.ReverseBinaryFragment, file.BinaryFragment
for _, fragment := range file.TextFragments { // swap postions fragment.OldPosition, fragment.NewPosition = fragment.NewPosition, fragment.OldPosition fragment.OldLines, fragment.NewLines = fragment.NewLines, fragment.OldLines fragment.LinesAdded, fragment.LinesDeleted = fragment.LinesDeleted, fragment.LinesAdded
for i := range fragment.Lines { switch fragment.Lines[i].Op { case gitdiff.OpAdd: fragment.Lines[i].Op = gitdiff.OpDelete case gitdiff.OpDelete: fragment.Lines[i].Op = gitdiff.OpAdd default: // do nothing } } }}
func Unified(oldText, oldFile, newText, newFile string) (string, error) { oldTemp, err := os.CreateTemp("", "old_*") if err != nil { return "", fmt.Errorf("failed to create temp file for oldText: %w", err) } defer os.Remove(oldTemp.Name()) if _, err := oldTemp.WriteString(oldText); err != nil { return "", fmt.Errorf("failed to write to old temp file: %w", err) } oldTemp.Close()
newTemp, err := os.CreateTemp("", "new_*") if err != nil { return "", fmt.Errorf("failed to create temp file for newText: %w", err) } defer os.Remove(newTemp.Name()) if _, err := newTemp.WriteString(newText); err != nil { return "", fmt.Errorf("failed to write to new temp file: %w", err) } newTemp.Close()
cmd := exec.Command("diff", "-u", "--label", oldFile, "--label", newFile, oldTemp.Name(), newTemp.Name()) output, err := cmd.CombinedOutput()
if exitErr, ok := err.(*exec.ExitError); ok && exitErr.ExitCode() == 1 { return string(output), nil } if err != nil { return "", fmt.Errorf("diff command failed: %w", err) }
return string(output), nil}