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134 lines
2.9 KiB
134 lines
2.9 KiB
// Copyright 2019 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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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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"os/exec"
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"regexp"
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"code.gitea.io/gitea/modules/process"
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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 *exec.Cmd
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pid int64
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output io.ReadCloser
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scanner *bufio.Scanner
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lastSha *string
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cancel context.CancelFunc
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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 (sequencial 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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scanner := r.scanner
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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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for scanner.Scan() {
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line := scanner.Text()
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// Skip empty lines
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if len(line) == 0 {
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continue
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}
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lines := shaLineRegex.FindStringSubmatch(line)
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if lines != nil {
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sha1 := 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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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, code)
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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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defer process.GetManager().Remove(r.pid)
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r.cancel()
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_ = r.output.Close()
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if err := r.cmd.Wait(); err != nil {
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return fmt.Errorf("Wait: %v", err)
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}
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return nil
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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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gitRepo, err := OpenRepository(repoPath)
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if err != nil {
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return nil, err
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}
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gitRepo.Close()
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return createBlameReader(ctx, repoPath, GitExecutable, "blame", commitID, "--porcelain", "--", file)
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}
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func createBlameReader(ctx context.Context, dir string, command ...string) (*BlameReader, error) {
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// Here we use the provided context - this should be tied to the request performing the blame so that it does not hang around.
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ctx, cancel := context.WithCancel(ctx)
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cmd := exec.CommandContext(ctx, command[0], command[1:]...)
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cmd.Dir = dir
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cmd.Stderr = os.Stderr
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stdout, err := cmd.StdoutPipe()
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if err != nil {
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defer cancel()
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return nil, fmt.Errorf("StdoutPipe: %v", err)
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}
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if err = cmd.Start(); err != nil {
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defer cancel()
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return nil, fmt.Errorf("Start: %v", err)
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}
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pid := process.GetManager().Add(fmt.Sprintf("GetBlame [repo_path: %s]", dir), cancel)
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scanner := bufio.NewScanner(stdout)
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return &BlameReader{
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cmd,
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pid,
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stdout,
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scanner,
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nil,
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cancel,
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}, nil
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}
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