gitea/models/git_diff.go

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// Copyright 2014 The Gogs 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 models
import (
"bufio"
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"bytes"
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"fmt"
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"io"
"os"
"os/exec"
"strings"
"time"
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"golang.org/x/net/html/charset"
"golang.org/x/text/transform"
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"github.com/Unknwon/com"
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"github.com/gogits/gogs/modules/base"
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"github.com/gogits/gogs/modules/git"
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"github.com/gogits/gogs/modules/log"
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"github.com/gogits/gogs/modules/process"
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)
// Diff line types.
const (
DIFF_LINE_PLAIN = iota + 1
DIFF_LINE_ADD
DIFF_LINE_DEL
DIFF_LINE_SECTION
)
const (
DIFF_FILE_ADD = iota + 1
DIFF_FILE_CHANGE
DIFF_FILE_DEL
)
type DiffLine struct {
LeftIdx int
RightIdx int
Type int
Content string
}
func (d DiffLine) GetType() int {
return d.Type
}
type DiffSection struct {
Name string
Lines []*DiffLine
}
type DiffFile struct {
Name string
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Index int
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Addition, Deletion int
Type int
IsCreated bool
IsDeleted bool
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IsBin bool
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Sections []*DiffSection
}
type Diff struct {
TotalAddition, TotalDeletion int
Files []*DiffFile
}
func (diff *Diff) NumFiles() int {
return len(diff.Files)
}
const DIFF_HEAD = "diff --git "
func ParsePatch(pid int64, maxlines int, cmd *exec.Cmd, reader io.Reader) (*Diff, error) {
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scanner := bufio.NewScanner(reader)
var (
curFile *DiffFile
curSection = &DiffSection{
Lines: make([]*DiffLine, 0, 10),
}
leftLine, rightLine int
isTooLong bool
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// FIXME: use first 30 lines to detect file encoding. Should use cache in the future.
buf bytes.Buffer
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)
diff := &Diff{Files: make([]*DiffFile, 0)}
var i int
for scanner.Scan() {
line := scanner.Text()
// fmt.Println(i, line)
if strings.HasPrefix(line, "+++ ") || strings.HasPrefix(line, "--- ") {
continue
}
if line == "" {
continue
}
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i = i + 1
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// FIXME: use first 30 lines to detect file encoding.
if i <= 30 {
buf.WriteString(line)
}
// Diff data too large, we only show the first about maxlines lines
if i == maxlines {
isTooLong = true
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log.Warn("Diff data too large")
//return &Diff{}, nil
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}
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switch {
case line[0] == ' ':
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diffLine := &DiffLine{Type: DIFF_LINE_PLAIN, Content: line, LeftIdx: leftLine, RightIdx: rightLine}
leftLine++
rightLine++
curSection.Lines = append(curSection.Lines, diffLine)
continue
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case line[0] == '@':
if isTooLong {
return diff, nil
}
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curSection = &DiffSection{}
curFile.Sections = append(curFile.Sections, curSection)
ss := strings.Split(line, "@@")
diffLine := &DiffLine{Type: DIFF_LINE_SECTION, Content: line}
curSection.Lines = append(curSection.Lines, diffLine)
// Parse line number.
ranges := strings.Split(ss[len(ss)-2][1:], " ")
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leftLine, _ = com.StrTo(strings.Split(ranges[0], ",")[0][1:]).Int()
rightLine, _ = com.StrTo(strings.Split(ranges[1], ",")[0]).Int()
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continue
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case line[0] == '+':
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curFile.Addition++
diff.TotalAddition++
diffLine := &DiffLine{Type: DIFF_LINE_ADD, Content: line, RightIdx: rightLine}
rightLine++
curSection.Lines = append(curSection.Lines, diffLine)
continue
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case line[0] == '-':
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curFile.Deletion++
diff.TotalDeletion++
diffLine := &DiffLine{Type: DIFF_LINE_DEL, Content: line, LeftIdx: leftLine}
if leftLine > 0 {
leftLine++
}
curSection.Lines = append(curSection.Lines, diffLine)
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case strings.HasPrefix(line, "Binary"):
curFile.IsBin = true
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continue
}
// Get new file.
if strings.HasPrefix(line, DIFF_HEAD) {
if isTooLong {
return diff, nil
}
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fs := strings.Split(line[len(DIFF_HEAD):], " ")
a := fs[0]
curFile = &DiffFile{
Name: a[strings.Index(a, "/")+1:],
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Index: len(diff.Files) + 1,
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Type: DIFF_FILE_CHANGE,
Sections: make([]*DiffSection, 0, 10),
}
diff.Files = append(diff.Files, curFile)
// Check file diff type.
for scanner.Scan() {
switch {
case strings.HasPrefix(scanner.Text(), "new file"):
curFile.Type = DIFF_FILE_ADD
curFile.IsDeleted = false
curFile.IsCreated = true
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case strings.HasPrefix(scanner.Text(), "deleted"):
curFile.Type = DIFF_FILE_DEL
curFile.IsCreated = false
curFile.IsDeleted = true
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case strings.HasPrefix(scanner.Text(), "index"):
curFile.Type = DIFF_FILE_CHANGE
curFile.IsCreated = false
curFile.IsDeleted = false
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}
if curFile.Type > 0 {
break
}
}
}
}
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// FIXME: use first 30 lines to detect file encoding.
charsetLabel, err := base.DetectEncoding(buf.Bytes())
if charsetLabel != "utf8" && err == nil {
encoding, _ := charset.Lookup(charsetLabel)
if encoding != nil {
d := encoding.NewDecoder()
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for _, f := range diff.Files {
for _, sec := range f.Sections {
for _, l := range sec.Lines {
if c, _, err := transform.String(d, l.Content); err == nil {
l.Content = c
}
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}
}
}
}
}
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return diff, nil
}
func GetDiffRange(repoPath, beforeCommitId string, afterCommitId string, maxlines int) (*Diff, error) {
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repo, err := git.OpenRepository(repoPath)
if err != nil {
return nil, err
}
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commit, err := repo.GetCommit(afterCommitId)
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if err != nil {
return nil, err
}
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rd, wr := io.Pipe()
var cmd *exec.Cmd
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// if "after" commit given
if beforeCommitId == "" {
// First commit of repository.
if commit.ParentCount() == 0 {
cmd = exec.Command("git", "show", afterCommitId)
} else {
c, _ := commit.Parent(0)
cmd = exec.Command("git", "diff", c.Id.String(), afterCommitId)
}
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} else {
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cmd = exec.Command("git", "diff", beforeCommitId, afterCommitId)
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}
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cmd.Dir = repoPath
cmd.Stdout = wr
cmd.Stdin = os.Stdin
cmd.Stderr = os.Stderr
done := make(chan error)
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go func() {
cmd.Start()
done <- cmd.Wait()
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wr.Close()
}()
defer rd.Close()
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desc := fmt.Sprintf("GetDiffRange(%s)", repoPath)
pid := process.Add(desc, cmd)
go func() {
// In case process became zombie.
select {
case <-time.After(5 * time.Minute):
if errKill := process.Kill(pid); errKill != nil {
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log.Error(4, "git_diff.ParsePatch(Kill): %v", err)
}
<-done
// return "", ErrExecTimeout.Error(), ErrExecTimeout
case err = <-done:
process.Remove(pid)
}
}()
return ParsePatch(pid, maxlines, cmd, rd)
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}
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func GetDiffCommit(repoPath, commitId string, maxlines int) (*Diff, error) {
return GetDiffRange(repoPath, "", commitId, maxlines)
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}