Method DiffCut

git/diff.go:284–331

DiffCut extracts diff snippet from a git diff hunk. The snippet is from the diff between the specified commit SHAs.

(ctx context.Context, params *DiffCutParams)

// DiffCut extracts diff snippet from a git diff hunk.
// The snippet is from the diff between the specified commit SHAs.
func (s *Service) DiffCut(ctx context.Context, params *DiffCutParams) (DiffCutOutput, error) {
	if params.SourceCommitSHA == params.TargetCommitSHA {
		return DiffCutOutput{}, errors.InvalidArgument("source and target SHA cannot be the same")
	}

	repoPath := getFullPathForRepo(s.reposRoot, params.RepoUID)

	mergeBaseSHA, _, err := s.git.GetMergeBase(ctx, repoPath, "", params.TargetCommitSHA, params.SourceCommitSHA)
	if err != nil {
		return DiffCutOutput{}, fmt.Errorf("failed to find merge base: %w", err)
	}

	header, linesHunk, err := s.git.DiffCut(
		ctx,
		repoPath,
		params.TargetCommitSHA,
		params.SourceCommitSHA,
		params.Path,
		params.IgnoreWhitespace,
		parser.DiffCutParams{
			LineStart:    params.LineStart,
			LineStartNew: params.LineStartNew,
			LineEnd:      params.LineEnd,
			LineEndNew:   params.LineEndNew,
			BeforeLines:  2,
			AfterLines:   2,
			LineLimit:    params.LineLimit,
		},
	)
	if err != nil {
		return DiffCutOutput{}, fmt.Errorf("DiffCut: failed to get diff hunk: %w", err)
	}

	hunkHeader := HunkHeader{
		OldLine: header.OldLine,
		OldSpan: header.OldSpan,
		NewLine: header.NewLine,
		NewSpan: header.NewSpan,
		Text:    header.Text,
	}

	return DiffCutOutput{
		Header:       hunkHeader,
		LinesHeader:  linesHunk.HunkHeader.String(),
		Lines:        linesHunk.Lines,
		MergeBaseSHA: mergeBaseSHA,
	}, nil
}

type FileDiff struct {
	SHA         string              `json:"sha"`