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mirror of https://github.com/go-gitea/gitea synced 2024-12-23 09:04:26 +00:00
gitea/services/gitdiff/gitdiff.go
mrsdizzie 9fe4b7b692
Fix error in diff html rendering (#13191)
* Fix error in diff html rendering

Was missing an optional whitespace check in regex. Also noticed a rare case where diff.Type == Equal would be empty and thus get a newline attached. Fixed that too.

Fixes #13177

* Update services/gitdiff/gitdiff.go

Co-authored-by: zeripath <art27@cantab.net>

* Update gitdiff_test.go

* fmt

Co-authored-by: zeripath <art27@cantab.net>
2020-10-18 13:51:38 -04:00

951 lines
28 KiB
Go

// Copyright 2014 The Gogs Authors. All rights reserved.
// 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 gitdiff
import (
"bufio"
"bytes"
"context"
"fmt"
"html/template"
"io"
"io/ioutil"
"net/url"
"os"
"os/exec"
"regexp"
"sort"
"strings"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/charset"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/highlight"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/process"
"code.gitea.io/gitea/modules/setting"
"github.com/sergi/go-diff/diffmatchpatch"
stdcharset "golang.org/x/net/html/charset"
"golang.org/x/text/transform"
)
// DiffLineType represents the type of a DiffLine.
type DiffLineType uint8
// DiffLineType possible values.
const (
DiffLinePlain DiffLineType = iota + 1
DiffLineAdd
DiffLineDel
DiffLineSection
)
// DiffFileType represents the type of a DiffFile.
type DiffFileType uint8
// DiffFileType possible values.
const (
DiffFileAdd DiffFileType = iota + 1
DiffFileChange
DiffFileDel
DiffFileRename
DiffFileCopy
)
// DiffLineExpandDirection represents the DiffLineSection expand direction
type DiffLineExpandDirection uint8
// DiffLineExpandDirection possible values.
const (
DiffLineExpandNone DiffLineExpandDirection = iota + 1
DiffLineExpandSingle
DiffLineExpandUpDown
DiffLineExpandUp
DiffLineExpandDown
)
// DiffLine represents a line difference in a DiffSection.
type DiffLine struct {
LeftIdx int
RightIdx int
Type DiffLineType
Content string
Comments []*models.Comment
SectionInfo *DiffLineSectionInfo
}
// DiffLineSectionInfo represents diff line section meta data
type DiffLineSectionInfo struct {
Path string
LastLeftIdx int
LastRightIdx int
LeftIdx int
RightIdx int
LeftHunkSize int
RightHunkSize int
}
// BlobExcerptChunkSize represent max lines of excerpt
const BlobExcerptChunkSize = 20
// GetType returns the type of a DiffLine.
func (d *DiffLine) GetType() int {
return int(d.Type)
}
// CanComment returns whether or not a line can get commented
func (d *DiffLine) CanComment() bool {
return len(d.Comments) == 0 && d.Type != DiffLineSection
}
// GetCommentSide returns the comment side of the first comment, if not set returns empty string
func (d *DiffLine) GetCommentSide() string {
if len(d.Comments) == 0 {
return ""
}
return d.Comments[0].DiffSide()
}
// GetLineTypeMarker returns the line type marker
func (d *DiffLine) GetLineTypeMarker() string {
if strings.IndexByte(" +-", d.Content[0]) > -1 {
return d.Content[0:1]
}
return ""
}
// GetBlobExcerptQuery builds query string to get blob excerpt
func (d *DiffLine) GetBlobExcerptQuery() string {
query := fmt.Sprintf(
"last_left=%d&last_right=%d&"+
"left=%d&right=%d&"+
"left_hunk_size=%d&right_hunk_size=%d&"+
"path=%s",
d.SectionInfo.LastLeftIdx, d.SectionInfo.LastRightIdx,
d.SectionInfo.LeftIdx, d.SectionInfo.RightIdx,
d.SectionInfo.LeftHunkSize, d.SectionInfo.RightHunkSize,
url.QueryEscape(d.SectionInfo.Path))
return query
}
// GetExpandDirection gets DiffLineExpandDirection
func (d *DiffLine) GetExpandDirection() DiffLineExpandDirection {
if d.Type != DiffLineSection || d.SectionInfo == nil || d.SectionInfo.RightIdx-d.SectionInfo.LastRightIdx <= 1 {
return DiffLineExpandNone
}
if d.SectionInfo.LastLeftIdx <= 0 && d.SectionInfo.LastRightIdx <= 0 {
return DiffLineExpandUp
} else if d.SectionInfo.RightIdx-d.SectionInfo.LastRightIdx > BlobExcerptChunkSize && d.SectionInfo.RightHunkSize > 0 {
return DiffLineExpandUpDown
} else if d.SectionInfo.LeftHunkSize <= 0 && d.SectionInfo.RightHunkSize <= 0 {
return DiffLineExpandDown
}
return DiffLineExpandSingle
}
func getDiffLineSectionInfo(treePath, line string, lastLeftIdx, lastRightIdx int) *DiffLineSectionInfo {
leftLine, leftHunk, rightLine, righHunk := git.ParseDiffHunkString(line)
return &DiffLineSectionInfo{
Path: treePath,
LastLeftIdx: lastLeftIdx,
LastRightIdx: lastRightIdx,
LeftIdx: leftLine,
RightIdx: rightLine,
LeftHunkSize: leftHunk,
RightHunkSize: righHunk,
}
}
// escape a line's content or return <br> needed for copy/paste purposes
func getLineContent(content string) string {
if len(content) > 0 {
return content
}
return "\n"
}
// DiffSection represents a section of a DiffFile.
type DiffSection struct {
FileName string
Name string
Lines []*DiffLine
}
var (
addedCodePrefix = []byte(`<span class="added-code">`)
removedCodePrefix = []byte(`<span class="removed-code">`)
codeTagSuffix = []byte(`</span>`)
)
var addSpanRegex = regexp.MustCompile(`<span\s*[a-z="]*$`)
func diffToHTML(fileName string, diffs []diffmatchpatch.Diff, lineType DiffLineType) template.HTML {
buf := bytes.NewBuffer(nil)
var addSpan string
for i := range diffs {
switch {
case diffs[i].Type == diffmatchpatch.DiffEqual:
// Looking for the case where our 3rd party diff library previously detected a string difference
// in the middle of a span class because we highlight them first. This happens when added/deleted code
// also changes the chroma class name, either partially or fully. If found, just move the openining span code forward into the next section
// see TestDiffToHTML for examples
if len(addSpan) > 0 {
diffs[i].Text = addSpan + diffs[i].Text
addSpan = ""
}
m := addSpanRegex.FindStringSubmatchIndex(diffs[i].Text)
if m != nil {
addSpan = diffs[i].Text[m[0]:m[1]]
buf.WriteString(strings.TrimSuffix(diffs[i].Text, addSpan))
} else {
addSpan = ""
buf.WriteString(getLineContent(diffs[i].Text))
}
case diffs[i].Type == diffmatchpatch.DiffInsert && lineType == DiffLineAdd:
if len(addSpan) > 0 {
diffs[i].Text = addSpan + diffs[i].Text
addSpan = ""
}
// Print existing closing span first before opening added-code span so it doesn't unintentionally close it
if strings.HasPrefix(diffs[i].Text, "</span>") {
buf.WriteString("</span>")
diffs[i].Text = strings.TrimPrefix(diffs[i].Text, "</span>")
}
m := addSpanRegex.FindStringSubmatchIndex(diffs[i].Text)
if m != nil {
addSpan = diffs[i].Text[m[0]:m[1]]
diffs[i].Text = strings.TrimSuffix(diffs[i].Text, addSpan)
}
buf.Write(addedCodePrefix)
buf.WriteString(diffs[i].Text)
buf.Write(codeTagSuffix)
case diffs[i].Type == diffmatchpatch.DiffDelete && lineType == DiffLineDel:
if len(addSpan) > 0 {
diffs[i].Text = addSpan + diffs[i].Text
addSpan = ""
}
if strings.HasPrefix(diffs[i].Text, "</span>") {
buf.WriteString("</span>")
diffs[i].Text = strings.TrimPrefix(diffs[i].Text, "</span>")
}
m := addSpanRegex.FindStringSubmatchIndex(diffs[i].Text)
if m != nil {
addSpan = diffs[i].Text[m[0]:m[1]]
diffs[i].Text = strings.TrimSuffix(diffs[i].Text, addSpan)
}
buf.Write(removedCodePrefix)
buf.WriteString(diffs[i].Text)
buf.Write(codeTagSuffix)
}
}
return template.HTML(buf.Bytes())
}
// GetLine gets a specific line by type (add or del) and file line number
func (diffSection *DiffSection) GetLine(lineType DiffLineType, idx int) *DiffLine {
var (
difference = 0
addCount = 0
delCount = 0
matchDiffLine *DiffLine
)
LOOP:
for _, diffLine := range diffSection.Lines {
switch diffLine.Type {
case DiffLineAdd:
addCount++
case DiffLineDel:
delCount++
default:
if matchDiffLine != nil {
break LOOP
}
difference = diffLine.RightIdx - diffLine.LeftIdx
addCount = 0
delCount = 0
}
switch lineType {
case DiffLineDel:
if diffLine.RightIdx == 0 && diffLine.LeftIdx == idx-difference {
matchDiffLine = diffLine
}
case DiffLineAdd:
if diffLine.LeftIdx == 0 && diffLine.RightIdx == idx+difference {
matchDiffLine = diffLine
}
}
}
if addCount == delCount {
return matchDiffLine
}
return nil
}
var diffMatchPatch = diffmatchpatch.New()
func init() {
diffMatchPatch.DiffEditCost = 100
}
// GetComputedInlineDiffFor computes inline diff for the given line.
func (diffSection *DiffSection) GetComputedInlineDiffFor(diffLine *DiffLine) template.HTML {
if setting.Git.DisableDiffHighlight {
return template.HTML(getLineContent(diffLine.Content[1:]))
}
var (
compareDiffLine *DiffLine
diff1 string
diff2 string
)
// try to find equivalent diff line. ignore, otherwise
switch diffLine.Type {
case DiffLineSection:
return template.HTML(getLineContent(diffLine.Content[1:]))
case DiffLineAdd:
compareDiffLine = diffSection.GetLine(DiffLineDel, diffLine.RightIdx)
if compareDiffLine == nil {
return template.HTML(highlight.Code(diffSection.FileName, diffLine.Content[1:]))
}
diff1 = compareDiffLine.Content
diff2 = diffLine.Content
case DiffLineDel:
compareDiffLine = diffSection.GetLine(DiffLineAdd, diffLine.LeftIdx)
if compareDiffLine == nil {
return template.HTML(highlight.Code(diffSection.FileName, diffLine.Content[1:]))
}
diff1 = diffLine.Content
diff2 = compareDiffLine.Content
default:
if strings.IndexByte(" +-", diffLine.Content[0]) > -1 {
return template.HTML(highlight.Code(diffSection.FileName, diffLine.Content[1:]))
}
return template.HTML(highlight.Code(diffSection.FileName, diffLine.Content))
}
diffRecord := diffMatchPatch.DiffMain(highlight.Code(diffSection.FileName, diff1[1:]), highlight.Code(diffSection.FileName, diff2[1:]), true)
diffRecord = diffMatchPatch.DiffCleanupEfficiency(diffRecord)
return diffToHTML(diffSection.FileName, diffRecord, diffLine.Type)
}
// DiffFile represents a file diff.
type DiffFile struct {
Name string
OldName string
Index int
Addition, Deletion int
Type DiffFileType
IsCreated bool
IsDeleted bool
IsBin bool
IsLFSFile bool
IsRenamed bool
IsSubmodule bool
Sections []*DiffSection
IsIncomplete bool
IsProtected bool
}
// GetType returns type of diff file.
func (diffFile *DiffFile) GetType() int {
return int(diffFile.Type)
}
// GetTailSection creates a fake DiffLineSection if the last section is not the end of the file
func (diffFile *DiffFile) GetTailSection(gitRepo *git.Repository, leftCommitID, rightCommitID string) *DiffSection {
if len(diffFile.Sections) == 0 || diffFile.Type != DiffFileChange || diffFile.IsBin || diffFile.IsLFSFile {
return nil
}
leftCommit, err := gitRepo.GetCommit(leftCommitID)
if err != nil {
return nil
}
rightCommit, err := gitRepo.GetCommit(rightCommitID)
if err != nil {
return nil
}
lastSection := diffFile.Sections[len(diffFile.Sections)-1]
lastLine := lastSection.Lines[len(lastSection.Lines)-1]
leftLineCount := getCommitFileLineCount(leftCommit, diffFile.Name)
rightLineCount := getCommitFileLineCount(rightCommit, diffFile.Name)
if leftLineCount <= lastLine.LeftIdx || rightLineCount <= lastLine.RightIdx {
return nil
}
tailDiffLine := &DiffLine{
Type: DiffLineSection,
Content: " ",
SectionInfo: &DiffLineSectionInfo{
Path: diffFile.Name,
LastLeftIdx: lastLine.LeftIdx,
LastRightIdx: lastLine.RightIdx,
LeftIdx: leftLineCount,
RightIdx: rightLineCount,
}}
tailSection := &DiffSection{FileName: diffFile.Name, Lines: []*DiffLine{tailDiffLine}}
return tailSection
}
func getCommitFileLineCount(commit *git.Commit, filePath string) int {
blob, err := commit.GetBlobByPath(filePath)
if err != nil {
return 0
}
lineCount, err := blob.GetBlobLineCount()
if err != nil {
return 0
}
return lineCount
}
// Diff represents a difference between two git trees.
type Diff struct {
NumFiles, TotalAddition, TotalDeletion int
Files []*DiffFile
IsIncomplete bool
}
// LoadComments loads comments into each line
func (diff *Diff) LoadComments(issue *models.Issue, currentUser *models.User) error {
allComments, err := models.FetchCodeComments(issue, currentUser)
if err != nil {
return err
}
for _, file := range diff.Files {
if lineCommits, ok := allComments[file.Name]; ok {
for _, section := range file.Sections {
for _, line := range section.Lines {
if comments, ok := lineCommits[int64(line.LeftIdx*-1)]; ok {
line.Comments = append(line.Comments, comments...)
}
if comments, ok := lineCommits[int64(line.RightIdx)]; ok {
line.Comments = append(line.Comments, comments...)
}
sort.SliceStable(line.Comments, func(i, j int) bool {
return line.Comments[i].CreatedUnix < line.Comments[j].CreatedUnix
})
}
}
}
}
return nil
}
const cmdDiffHead = "diff --git "
// ParsePatch builds a Diff object from a io.Reader and some parameters.
func ParsePatch(maxLines, maxLineCharacters, maxFiles int, reader io.Reader) (*Diff, error) {
var curFile *DiffFile
diff := &Diff{Files: make([]*DiffFile, 0)}
sb := strings.Builder{}
// OK let's set a reasonable buffer size.
// This should be let's say at least the size of maxLineCharacters or 4096 whichever is larger.
readerSize := maxLineCharacters
if readerSize < 4096 {
readerSize = 4096
}
input := bufio.NewReaderSize(reader, readerSize)
line, err := input.ReadString('\n')
if err != nil {
if err == io.EOF {
return diff, nil
}
return diff, err
}
parsingLoop:
for {
// 1. A patch file always begins with `diff --git ` + `a/path b/path` (possibly quoted)
// if it does not we have bad input!
if !strings.HasPrefix(line, cmdDiffHead) {
return diff, fmt.Errorf("Invalid first file line: %s", line)
}
// TODO: Handle skipping first n files
if len(diff.Files) >= maxFiles {
diff.IsIncomplete = true
_, err := io.Copy(ioutil.Discard, reader)
if err != nil {
// By the definition of io.Copy this never returns io.EOF
return diff, fmt.Errorf("Copy: %v", err)
}
break parsingLoop
}
curFile = createDiffFile(diff, line)
diff.Files = append(diff.Files, curFile)
// 2. It is followed by one or more extended header lines:
//
// old mode <mode>
// new mode <mode>
// deleted file mode <mode>
// new file mode <mode>
// copy from <path>
// copy to <path>
// rename from <path>
// rename to <path>
// similarity index <number>
// dissimilarity index <number>
// index <hash>..<hash> <mode>
//
// * <mode> 6-digit octal numbers including the file type and file permission bits.
// * <path> does not include the a/ and b/ prefixes
// * <number> percentage of unchanged lines for similarity, percentage of changed
// lines dissimilarity as integer rounded down with terminal %. 100% => equal files.
// * The index line includes the blob object names before and after the change.
// The <mode> is included if the file mode does not change; otherwise, separate
// lines indicate the old and the new mode.
// 3. Following this header the "standard unified" diff format header may be encountered: (but not for every case...)
//
// --- a/<path>
// +++ b/<path>
//
// With multiple hunks
//
// @@ <hunk descriptor> @@
// +added line
// -removed line
// unchanged line
//
// 4. Binary files get:
//
// Binary files a/<path> and b/<path> differ
//
// but one of a/<path> and b/<path> could be /dev/null.
curFileLoop:
for {
line, err = input.ReadString('\n')
if err != nil {
if err != io.EOF {
return diff, err
}
break parsingLoop
}
switch {
case strings.HasPrefix(line, "old mode ") ||
strings.HasPrefix(line, "new mode "):
if strings.HasSuffix(line, " 160000\n") {
curFile.IsSubmodule = true
}
case strings.HasPrefix(line, "copy from "):
curFile.IsRenamed = true
curFile.Type = DiffFileCopy
case strings.HasPrefix(line, "copy to "):
curFile.IsRenamed = true
curFile.Type = DiffFileCopy
case strings.HasPrefix(line, "new file"):
curFile.Type = DiffFileAdd
curFile.IsCreated = true
if strings.HasSuffix(line, " 160000\n") {
curFile.IsSubmodule = true
}
case strings.HasPrefix(line, "deleted"):
curFile.Type = DiffFileDel
curFile.IsDeleted = true
if strings.HasSuffix(line, " 160000\n") {
curFile.IsSubmodule = true
}
case strings.HasPrefix(line, "index"):
if strings.HasSuffix(line, " 160000\n") {
curFile.IsSubmodule = true
}
case strings.HasPrefix(line, "similarity index 100%"):
curFile.Type = DiffFileRename
case strings.HasPrefix(line, "Binary"):
curFile.IsBin = true
case strings.HasPrefix(line, "--- "):
// Do nothing with this line
case strings.HasPrefix(line, "+++ "):
// Do nothing with this line
lineBytes, isFragment, err := parseHunks(curFile, maxLines, maxLineCharacters, input)
diff.TotalAddition += curFile.Addition
diff.TotalDeletion += curFile.Deletion
if err != nil {
if err != io.EOF {
return diff, err
}
break parsingLoop
}
sb.Reset()
_, _ = sb.Write(lineBytes)
for isFragment {
lineBytes, isFragment, err = input.ReadLine()
if err != nil {
// Now by the definition of ReadLine this cannot be io.EOF
return diff, fmt.Errorf("Unable to ReadLine: %v", err)
}
_, _ = sb.Write(lineBytes)
}
line = sb.String()
sb.Reset()
break curFileLoop
}
}
}
// FIXME: There are numerous issues with this:
// - we might want to consider detecting encoding while parsing but...
// - we're likely to fail to get the correct encoding here anyway as we won't have enough information
// - and this doesn't really account for changes in encoding
var buf bytes.Buffer
for _, f := range diff.Files {
buf.Reset()
for _, sec := range f.Sections {
for _, l := range sec.Lines {
if l.Type == DiffLineSection {
continue
}
buf.WriteString(l.Content[1:])
buf.WriteString("\n")
}
}
charsetLabel, err := charset.DetectEncoding(buf.Bytes())
if charsetLabel != "UTF-8" && err == nil {
encoding, _ := stdcharset.Lookup(charsetLabel)
if encoding != nil {
d := encoding.NewDecoder()
for _, sec := range f.Sections {
for _, l := range sec.Lines {
if l.Type == DiffLineSection {
continue
}
if c, _, err := transform.String(d, l.Content[1:]); err == nil {
l.Content = l.Content[0:1] + c
}
}
}
}
}
}
diff.NumFiles = len(diff.Files)
return diff, nil
}
func parseHunks(curFile *DiffFile, maxLines, maxLineCharacters int, input *bufio.Reader) (lineBytes []byte, isFragment bool, err error) {
sb := strings.Builder{}
var (
curSection *DiffSection
curFileLinesCount int
curFileLFSPrefix bool
)
leftLine, rightLine := 1, 1
for {
sb.Reset()
lineBytes, isFragment, err = input.ReadLine()
if err != nil {
if err == io.EOF {
return
}
err = fmt.Errorf("Unable to ReadLine: %v", err)
return
}
if lineBytes[0] == 'd' {
// End of hunks
return
}
switch lineBytes[0] {
case '@':
if curFileLinesCount >= maxLines {
curFile.IsIncomplete = true
continue
}
_, _ = sb.Write(lineBytes)
for isFragment {
// This is very odd indeed - we're in a section header and the line is too long
// This really shouldn't happen...
lineBytes, isFragment, err = input.ReadLine()
if err != nil {
// Now by the definition of ReadLine this cannot be io.EOF
err = fmt.Errorf("Unable to ReadLine: %v", err)
return
}
_, _ = sb.Write(lineBytes)
}
line := sb.String()
// Create a new section to represent this hunk
curSection = &DiffSection{}
curFile.Sections = append(curFile.Sections, curSection)
lineSectionInfo := getDiffLineSectionInfo(curFile.Name, line, leftLine-1, rightLine-1)
diffLine := &DiffLine{
Type: DiffLineSection,
Content: line,
SectionInfo: lineSectionInfo,
}
curSection.Lines = append(curSection.Lines, diffLine)
curSection.FileName = curFile.Name
// update line number.
leftLine = lineSectionInfo.LeftIdx
rightLine = lineSectionInfo.RightIdx
continue
case '\\':
if curFileLinesCount >= maxLines {
curFile.IsIncomplete = true
continue
}
// This is used only to indicate that the current file does not have a terminal newline
if !bytes.Equal(lineBytes, []byte("\\ No newline at end of file")) {
err = fmt.Errorf("Unexpected line in hunk: %s", string(lineBytes))
return
}
// Technically this should be the end the file!
// FIXME: we should be putting a marker at the end of the file if there is no terminal new line
continue
case '+':
curFileLinesCount++
curFile.Addition++
if curFileLinesCount >= maxLines {
curFile.IsIncomplete = true
continue
}
diffLine := &DiffLine{Type: DiffLineAdd, RightIdx: rightLine}
rightLine++
curSection.Lines = append(curSection.Lines, diffLine)
case '-':
curFileLinesCount++
curFile.Deletion++
if curFileLinesCount >= maxLines {
curFile.IsIncomplete = true
continue
}
diffLine := &DiffLine{Type: DiffLineDel, LeftIdx: leftLine}
if leftLine > 0 {
leftLine++
}
curSection.Lines = append(curSection.Lines, diffLine)
case ' ':
curFileLinesCount++
if curFileLinesCount >= maxLines {
curFile.IsIncomplete = true
continue
}
diffLine := &DiffLine{Type: DiffLinePlain, LeftIdx: leftLine, RightIdx: rightLine}
leftLine++
rightLine++
curSection.Lines = append(curSection.Lines, diffLine)
default:
// This is unexpected
err = fmt.Errorf("Unexpected line in hunk: %s", string(lineBytes))
return
}
line := string(lineBytes)
if isFragment {
curFile.IsIncomplete = true
for isFragment {
lineBytes, isFragment, err = input.ReadLine()
if err != nil {
// Now by the definition of ReadLine this cannot be io.EOF
err = fmt.Errorf("Unable to ReadLine: %v", err)
return
}
}
}
curSection.Lines[len(curSection.Lines)-1].Content = line
// handle LFS
if line[1:] == models.LFSMetaFileIdentifier {
curFileLFSPrefix = true
} else if curFileLFSPrefix && strings.HasPrefix(line[1:], models.LFSMetaFileOidPrefix) {
oid := strings.TrimPrefix(line[1:], models.LFSMetaFileOidPrefix)
if len(oid) == 64 {
m := &models.LFSMetaObject{Oid: oid}
count, err := models.Count(m)
if err == nil && count > 0 {
curFile.IsBin = true
curFile.IsLFSFile = true
curSection.Lines = nil
}
}
}
}
}
func createDiffFile(diff *Diff, line string) *DiffFile {
// The a/ and b/ filenames are the same unless rename/copy is involved.
// Especially, even for a creation or a deletion, /dev/null is not used
// in place of the a/ or b/ filenames.
//
// When rename/copy is involved, file1 and file2 show the name of the
// source file of the rename/copy and the name of the file that rename/copy
// produces, respectively.
//
// Path names are quoted if necessary.
//
// This means that you should always be able to determine the file name even when there
// there is potential ambiguity...
//
// but we can be simpler with our heuristics by just forcing git to prefix things nicely
curFile := &DiffFile{
Index: len(diff.Files) + 1,
Type: DiffFileChange,
Sections: make([]*DiffSection, 0, 10),
}
rd := strings.NewReader(line[len(cmdDiffHead):] + " ")
curFile.Type = DiffFileChange
curFile.OldName = readFileName(rd)
curFile.Name = readFileName(rd)
curFile.IsRenamed = curFile.Name != curFile.OldName
return curFile
}
func readFileName(rd *strings.Reader) string {
var name string
char, _ := rd.ReadByte()
_ = rd.UnreadByte()
if char == '"' {
fmt.Fscanf(rd, "%q ", &name)
if name[0] == '\\' {
name = name[1:]
}
} else {
fmt.Fscanf(rd, "%s ", &name)
}
return name[2:]
}
// GetDiffRange builds a Diff between two commits of a repository.
// passing the empty string as beforeCommitID returns a diff from the
// parent commit.
func GetDiffRange(repoPath, beforeCommitID, afterCommitID string, maxLines, maxLineCharacters, maxFiles int) (*Diff, error) {
return GetDiffRangeWithWhitespaceBehavior(repoPath, beforeCommitID, afterCommitID, maxLines, maxLineCharacters, maxFiles, "")
}
// GetDiffRangeWithWhitespaceBehavior builds a Diff between two commits of a repository.
// Passing the empty string as beforeCommitID returns a diff from the parent commit.
// The whitespaceBehavior is either an empty string or a git flag
func GetDiffRangeWithWhitespaceBehavior(repoPath, beforeCommitID, afterCommitID string, maxLines, maxLineCharacters, maxFiles int, whitespaceBehavior string) (*Diff, error) {
gitRepo, err := git.OpenRepository(repoPath)
if err != nil {
return nil, err
}
defer gitRepo.Close()
commit, err := gitRepo.GetCommit(afterCommitID)
if err != nil {
return nil, err
}
// FIXME: graceful: These commands should likely have a timeout
ctx, cancel := context.WithCancel(git.DefaultContext)
defer cancel()
var cmd *exec.Cmd
if (len(beforeCommitID) == 0 || beforeCommitID == git.EmptySHA) && commit.ParentCount() == 0 {
cmd = exec.CommandContext(ctx, git.GitExecutable, "show", afterCommitID)
} else {
actualBeforeCommitID := beforeCommitID
if len(actualBeforeCommitID) == 0 {
parentCommit, _ := commit.Parent(0)
actualBeforeCommitID = parentCommit.ID.String()
}
diffArgs := []string{"diff", "--src-prefix=\\a/", "--dst-prefix=\\b/", "-M"}
if len(whitespaceBehavior) != 0 {
diffArgs = append(diffArgs, whitespaceBehavior)
}
diffArgs = append(diffArgs, actualBeforeCommitID)
diffArgs = append(diffArgs, afterCommitID)
cmd = exec.CommandContext(ctx, git.GitExecutable, diffArgs...)
beforeCommitID = actualBeforeCommitID
}
cmd.Dir = repoPath
cmd.Stderr = os.Stderr
stdout, err := cmd.StdoutPipe()
if err != nil {
return nil, fmt.Errorf("StdoutPipe: %v", err)
}
if err = cmd.Start(); err != nil {
return nil, fmt.Errorf("Start: %v", err)
}
pid := process.GetManager().Add(fmt.Sprintf("GetDiffRange [repo_path: %s]", repoPath), cancel)
defer process.GetManager().Remove(pid)
diff, err := ParsePatch(maxLines, maxLineCharacters, maxFiles, stdout)
if err != nil {
return nil, fmt.Errorf("ParsePatch: %v", err)
}
for _, diffFile := range diff.Files {
tailSection := diffFile.GetTailSection(gitRepo, beforeCommitID, afterCommitID)
if tailSection != nil {
diffFile.Sections = append(diffFile.Sections, tailSection)
}
}
if err = cmd.Wait(); err != nil {
return nil, fmt.Errorf("Wait: %v", err)
}
shortstatArgs := []string{beforeCommitID + "..." + afterCommitID}
if len(beforeCommitID) == 0 || beforeCommitID == git.EmptySHA {
shortstatArgs = []string{git.EmptyTreeSHA, afterCommitID}
}
diff.NumFiles, diff.TotalAddition, diff.TotalDeletion, err = git.GetDiffShortStat(repoPath, shortstatArgs...)
if err != nil && strings.Contains(err.Error(), "no merge base") {
// git >= 2.28 now returns an error if base and head have become unrelated.
// previously it would return the results of git diff --shortstat base head so let's try that...
shortstatArgs = []string{beforeCommitID, afterCommitID}
diff.NumFiles, diff.TotalAddition, diff.TotalDeletion, err = git.GetDiffShortStat(repoPath, shortstatArgs...)
}
if err != nil {
return nil, err
}
return diff, nil
}
// GetDiffCommit builds a Diff representing the given commitID.
func GetDiffCommit(repoPath, commitID string, maxLines, maxLineCharacters, maxFiles int) (*Diff, error) {
return GetDiffRange(repoPath, "", commitID, maxLines, maxLineCharacters, maxFiles)
}
// CommentAsDiff returns c.Patch as *Diff
func CommentAsDiff(c *models.Comment) (*Diff, error) {
diff, err := ParsePatch(setting.Git.MaxGitDiffLines,
setting.Git.MaxGitDiffLineCharacters, setting.Git.MaxGitDiffFiles, strings.NewReader(c.Patch))
if err != nil {
return nil, err
}
if len(diff.Files) == 0 {
return nil, fmt.Errorf("no file found for comment ID: %d", c.ID)
}
secs := diff.Files[0].Sections
if len(secs) == 0 {
return nil, fmt.Errorf("no sections found for comment ID: %d", c.ID)
}
return diff, nil
}
// CommentMustAsDiff executes AsDiff and logs the error instead of returning
func CommentMustAsDiff(c *models.Comment) *Diff {
diff, err := CommentAsDiff(c)
if err != nil {
log.Warn("CommentMustAsDiff: %v", err)
}
return diff
}