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139 lines
3.0 KiB
139 lines
3.0 KiB
// Copyright 2019 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package git
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import (
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"bufio"
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"context"
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"fmt"
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"io"
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"os"
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"regexp"
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)
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// BlamePart represents block of blame - continuous lines with one sha
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type BlamePart struct {
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Sha string
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Lines []string
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}
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// BlameReader returns part of file blame one by one
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type BlameReader struct {
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cmd *Command
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output io.WriteCloser
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reader io.ReadCloser
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bufferedReader *bufio.Reader
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done chan error
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lastSha *string
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}
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var shaLineRegex = regexp.MustCompile("^([a-z0-9]{40})")
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// NextPart returns next part of blame (sequential code lines with the same commit)
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func (r *BlameReader) NextPart() (*BlamePart, error) {
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var blamePart *BlamePart
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if r.lastSha != nil {
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blamePart = &BlamePart{*r.lastSha, make([]string, 0)}
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}
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var line []byte
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var isPrefix bool
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var err error
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for err != io.EOF {
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line, isPrefix, err = r.bufferedReader.ReadLine()
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if err != nil && err != io.EOF {
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return blamePart, err
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}
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if len(line) == 0 {
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// isPrefix will be false
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continue
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}
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lines := shaLineRegex.FindSubmatch(line)
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if lines != nil {
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sha1 := string(lines[1])
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if blamePart == nil {
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blamePart = &BlamePart{sha1, make([]string, 0)}
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}
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if blamePart.Sha != sha1 {
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r.lastSha = &sha1
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// need to munch to end of line...
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for isPrefix {
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_, isPrefix, err = r.bufferedReader.ReadLine()
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if err != nil && err != io.EOF {
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return blamePart, err
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}
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}
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return blamePart, nil
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}
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} else if line[0] == '\t' {
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code := line[1:]
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blamePart.Lines = append(blamePart.Lines, string(code))
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}
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// need to munch to end of line...
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for isPrefix {
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_, isPrefix, err = r.bufferedReader.ReadLine()
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if err != nil && err != io.EOF {
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return blamePart, err
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}
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}
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}
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r.lastSha = nil
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return blamePart, nil
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}
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// Close BlameReader - don't run NextPart after invoking that
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func (r *BlameReader) Close() error {
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err := <-r.done
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r.bufferedReader = nil
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_ = r.reader.Close()
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_ = r.output.Close()
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return err
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}
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// CreateBlameReader creates reader for given repository, commit and file
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func CreateBlameReader(ctx context.Context, repoPath, commitID, file string) (*BlameReader, error) {
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cmd := NewCommandContextNoGlobals(ctx, "blame", "--porcelain").
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AddDynamicArguments(commitID).
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AddDashesAndList(file).
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SetDescription(fmt.Sprintf("GetBlame [repo_path: %s]", repoPath))
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reader, stdout, err := os.Pipe()
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if err != nil {
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return nil, err
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}
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done := make(chan error, 1)
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go func(cmd *Command, dir string, stdout io.WriteCloser, done chan error) {
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if err := cmd.Run(&RunOpts{
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UseContextTimeout: true,
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Dir: dir,
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Stdout: stdout,
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Stderr: os.Stderr,
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}); err == nil {
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stdout.Close()
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}
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done <- err
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}(cmd, repoPath, stdout, done)
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bufferedReader := bufio.NewReader(reader)
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return &BlameReader{
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cmd: cmd,
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output: stdout,
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reader: reader,
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bufferedReader: bufferedReader,
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done: done,
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}, nil
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}
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