Method ParseNextFileHeader

pkg/gitdiff/file_header.go:19–61

ParseNextFileHeader finds and parses the next file header in the stream. If a header is found, it returns a file and all input before the header. It returns nil if no headers are found before the end of the input.

()

// a header is found, it returns a file and all input before the header. It
// returns nil if no headers are found before the end of the input.
func (p *parser) ParseNextFileHeader() (*File, string, error) {
	var preamble strings.Builder
	var file *File
	for {
		// check for disconnected fragment headers (corrupt patch)
		frag, err := p.ParseTextFragmentHeader()
		if err != nil {
			// not a valid header, nothing to worry about
			goto NextLine
		}
		if frag != nil {
			return nil, "", p.Errorf(-1, "patch fragment without file header: %s", frag.Header())
		}

		// check for a git-generated patch
		file, err = p.ParseGitFileHeader()
		if err != nil {
			return nil, "", err
		}
		if file != nil {
			return file, preamble.String(), nil
		}

		// check for a "traditional" patch
		file, err = p.ParseTraditionalFileHeader()
		if err != nil {
			return nil, "", err
		}
		if file != nil {
			return file, preamble.String(), nil
		}

	NextLine:
		preamble.WriteString(p.Line(0))
		if err := p.Next(); err != nil {
			if err == io.EOF {
				break
			}
			return nil, "", err
		}
	}
	return nil, preamble.String(), nil
}

func (p *parser) ParseGitFileHeader() (*File, error) {
	const prefix = "diff --git "