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forgejo/modules/gitgraph/graph.go

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// Copyright 2016 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 gitgraph
import (
"bufio"
"bytes"
"context"
"fmt"
"os"
"strings"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/setting"
)
// GraphItem represent one commit, or one relation in timeline
type GraphItem struct {
GraphAcii string
Relation string
Branch string
Rev string
Date string
Author string
AuthorEmail string
ShortRev string
Subject string
OnlyRelation bool
}
// GraphItems is a list of commits from all branches
type GraphItems []GraphItem
// GetCommitGraph return a list of commit (GraphItems) from all branches
func GetCommitGraph(r *git.Repository, page int) (GraphItems, error) {
format := "DATA:|%d|%H|%ad|%an|%ae|%h|%s"
if page == 0 {
page = 1
}
graphCmd := git.NewCommand("log")
graphCmd.AddArguments("--graph",
"--date-order",
"--all",
"-C",
"-M",
fmt.Sprintf("-n %d", setting.UI.GraphMaxCommitNum*page),
"--date=iso",
fmt.Sprintf("--pretty=format:%s", format),
)
commitGraph := make([]GraphItem, 0, 100)
stderr := new(strings.Builder)
stdoutReader, stdoutWriter, err := os.Pipe()
if err != nil {
return nil, err
}
commitsToSkip := setting.UI.GraphMaxCommitNum * (page - 1)
scanner := bufio.NewScanner(stdoutReader)
if err := graphCmd.RunInDirTimeoutEnvFullPipelineFunc(nil, -1, r.Path, stdoutWriter, stderr, nil, func(ctx context.Context, cancel context.CancelFunc) error {
_ = stdoutWriter.Close()
defer stdoutReader.Close()
for commitsToSkip > 0 && scanner.Scan() {
line := scanner.Bytes()
dataIdx := bytes.Index(line, []byte("DATA:"))
starIdx := bytes.IndexByte(line, '*')
if starIdx >= 0 && starIdx < dataIdx {
commitsToSkip--
}
}
// Skip initial non-commit lines
for scanner.Scan() {
if bytes.IndexByte(scanner.Bytes(), '*') >= 0 {
line := scanner.Text()
graphItem, err := graphItemFromString(line, r)
if err != nil {
cancel()
return err
}
commitGraph = append(commitGraph, graphItem)
break
}
}
for scanner.Scan() {
line := scanner.Text()
graphItem, err := graphItemFromString(line, r)
if err != nil {
cancel()
return err
}
commitGraph = append(commitGraph, graphItem)
}
return scanner.Err()
}); err != nil {
return commitGraph, err
}
return commitGraph, nil
}
func graphItemFromString(s string, r *git.Repository) (GraphItem, error) {
var ascii string
var data = "|||||||"
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lines := strings.SplitN(s, "DATA:", 2)
switch len(lines) {
case 1:
ascii = lines[0]
case 2:
ascii = lines[0]
data = lines[1]
default:
return GraphItem{}, fmt.Errorf("Failed parsing grap line:%s. Expect 1 or two fields", s)
}
rows := strings.SplitN(data, "|", 8)
if len(rows) < 8 {
return GraphItem{}, fmt.Errorf("Failed parsing grap line:%s - Should containt 8 datafields", s)
}
/* // see format in getCommitGraph()
0 Relation string
1 Branch string
2 Rev string
3 Date string
4 Author string
5 AuthorEmail string
6 ShortRev string
7 Subject string
*/
gi := GraphItem{ascii,
rows[0],
rows[1],
rows[2],
rows[3],
rows[4],
rows[5],
rows[6],
rows[7],
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len(rows[2]) == 0, // no commits referred to, only relation in current line.
}
return gi, nil
}