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// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package git
import (
"bufio"
"context"
"fmt"
"io"
"os"
"os/exec"
"regexp"
"code.gitea.io/gitea/modules/process"
)
// BlamePart represents block of blame - continuous lines with one sha
type BlamePart struct {
Sha string
Lines []string
}
// BlameReader returns part of file blame one by one
type BlameReader struct {
cmd *exec.Cmd
pid int64
output io.ReadCloser
scanner *bufio.Scanner
lastSha *string
cancel context.CancelFunc
}
var shaLineRegex = regexp.MustCompile("^([a-z0-9]{40})")
// NextPart returns next part of blame (sequencial code lines with the same commit)
func (r *BlameReader) NextPart() (*BlamePart, error) {
var blamePart *BlamePart
scanner := r.scanner
if r.lastSha != nil {
blamePart = &BlamePart{*r.lastSha, make([]string, 0)}
}
for scanner.Scan() {
line := scanner.Text()
// Skip empty lines
if len(line) == 0 {
continue
}
lines := shaLineRegex.FindStringSubmatch(line)
if lines != nil {
sha1 := lines[1]
if blamePart == nil {
blamePart = &BlamePart{sha1, make([]string, 0)}
}
if blamePart.Sha != sha1 {
r.lastSha = &sha1
return blamePart, nil
}
} else if line[0] == '\t' {
code := line[1:]
blamePart.Lines = append(blamePart.Lines, code)
}
}
r.lastSha = nil
return blamePart, nil
}
// Close BlameReader - don't run NextPart after invoking that
func (r *BlameReader) Close() error {
defer process.GetManager().Remove(r.pid)
defer r.cancel()
if err := r.cmd.Wait(); err != nil {
return fmt.Errorf("Wait: %v", err)
}
return nil
}
// CreateBlameReader creates reader for given repository, commit and file
func CreateBlameReader(repoPath, commitID, file string) (*BlameReader, error) {
gitRepo, err := OpenRepository(repoPath)
if err != nil {
return nil, err
}
gitRepo.Close()
return createBlameReader(repoPath, GitExecutable, "blame", commitID, "--porcelain", "--", file)
}
func createBlameReader(dir string, command ...string) (*BlameReader, error) {
// FIXME: graceful: This should have a timeout
ctx, cancel := context.WithCancel(DefaultContext)
cmd := exec.CommandContext(ctx, command[0], command[1:]...)
cmd.Dir = dir
cmd.Stderr = os.Stderr
stdout, err := cmd.StdoutPipe()
if err != nil {
defer cancel()
return nil, fmt.Errorf("StdoutPipe: %v", err)
}
if err = cmd.Start(); err != nil {
defer cancel()
return nil, fmt.Errorf("Start: %v", err)
}
pid := process.GetManager().Add(fmt.Sprintf("GetBlame [repo_path: %s]", dir), cancel)
scanner := bufio.NewScanner(stdout)
return &BlameReader{
cmd,
pid,
stdout,
scanner,
nil,
cancel,
}, nil
}
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