func ToUtf8WithErr(content []byte) (error, string) {
charsetLabel, err := base.DetectEncoding(content)
if err != nil {
return err, ""
} else if charsetLabel == "UTF-8" {
return nil, string(content)
}
encoding, _ := charset.Lookup(charsetLabel)
if encoding == nil {
return fmt.Errorf("Unknown encoding: %s", charsetLabel), string(content)
}
// If there is an error, we concatenate the nicely decoded part and the
// original left over. This way we won't loose data.
result, n, err := transform.String(encoding.NewDecoder(), string(content))
if err != nil {
result = result + string(content[n:])
}
return err, result
}
func ParsePatch(maxlines int, reader io.Reader) (*Diff, error) {
var (
diff = &Diff{Files: make([]*DiffFile, 0)}
curFile *DiffFile
curSection = &DiffSection{
Lines: make([]*DiffLine, 0, 10),
}
leftLine, rightLine int
lineCount int
)
input := bufio.NewReader(reader)
isEOF := false
for {
if isEOF {
break
}
line, err := input.ReadString('\n')
if err != nil {
if err == io.EOF {
isEOF = true
} else {
return nil, fmt.Errorf("ReadString: %v", err)
}
}
if len(line) > 0 && line[len(line)-1] == '\n' {
// Remove line break.
line = line[:len(line)-1]
}
if strings.HasPrefix(line, "+++ ") || strings.HasPrefix(line, "--- ") {
continue
} else if len(line) == 0 {
continue
}
lineCount++
// Diff data too large, we only show the first about maxlines lines
if lineCount >= maxlines {
log.Warn("Diff data too large")
io.Copy(ioutil.Discard, reader)
diff.Files = nil
return diff, nil
}
switch {
case line[0] == ' ':
diffLine := &DiffLine{Type: DIFF_LINE_PLAIN, Content: line, LeftIdx: leftLine, RightIdx: rightLine}
leftLine++
rightLine++
curSection.Lines = append(curSection.Lines, diffLine)
continue
case line[0] == '@':
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[1][1:], " ")
leftLine, _ = com.StrTo(strings.Split(ranges[0], ",")[0][1:]).Int()
if len(ranges) > 1 {
rightLine, _ = com.StrTo(strings.Split(ranges[1], ",")[0]).Int()
} else {
log.Warn("Parse line number failed: %v", line)
rightLine = leftLine
}
continue
case line[0] == '+':
curFile.Addition++
diff.TotalAddition++
diffLine := &DiffLine{Type: DIFF_LINE_ADD, Content: line, RightIdx: rightLine}
rightLine++
curSection.Lines = append(curSection.Lines, diffLine)
continue
case line[0] == '-':
curFile.Deletion++
diff.TotalDeletion++
diffLine := &DiffLine{Type: DIFF_LINE_DEL, Content: line, LeftIdx: leftLine}
if leftLine > 0 {
leftLine++
}
curSection.Lines = append(curSection.Lines, diffLine)
case strings.HasPrefix(line, "Binary"):
curFile.IsBin = true
continue
}
// Get new file.
if strings.HasPrefix(line, DIFF_HEAD) {
middle := -1
// Note: In case file name is surrounded by double quotes (it happens only in git-shell).
// e.g. diff --git "a/xxx" "b/xxx"
hasQuote := line[len(DIFF_HEAD)] == '"'
if hasQuote {
middle = strings.Index(line, ` "b/`)
} else {
middle = strings.Index(line, " b/")
}
beg := len(DIFF_HEAD)
a := line[beg+2 : middle]
b := line[middle+3:]
if hasQuote {
a = string(git.UnescapeChars([]byte(a[1 : len(a)-1])))
b = string(git.UnescapeChars([]byte(b[1 : len(b)-1])))
}
curFile = &DiffFile{
Name: a,
Index: len(diff.Files) + 1,
Type: DIFF_FILE_CHANGE,
Sections: make([]*DiffSection, 0, 10),
}
diff.Files = append(diff.Files, curFile)
// Check file diff type.
for {
line, err := input.ReadString('\n')
if err != nil {
if err == io.EOF {
isEOF = true
} else {
return nil, fmt.Errorf("ReadString: %v", err)
}
}
switch {
case strings.HasPrefix(line, "new file"):
curFile.Type = DIFF_FILE_ADD
curFile.IsCreated = true
case strings.HasPrefix(line, "deleted"):
curFile.Type = DIFF_FILE_DEL
curFile.IsDeleted = true
case strings.HasPrefix(line, "index"):
curFile.Type = DIFF_FILE_CHANGE
case strings.HasPrefix(line, "similarity index 100%"):
curFile.Type = DIFF_FILE_RENAME
curFile.IsRenamed = true
curFile.OldName = curFile.Name
curFile.Name = b
}
if curFile.Type > 0 {
break
}
}
}
}
// FIXME: detect encoding while parsing.
var buf bytes.Buffer
for _, f := range diff.Files {
buf.Reset()
for _, sec := range f.Sections {
for _, l := range sec.Lines {
buf.WriteString(l.Content)
buf.WriteString("\n")
}
}
charsetLabel, err := base.DetectEncoding(buf.Bytes())
if charsetLabel != "UTF-8" && err == nil {
encoding, _ := charset.Lookup(charsetLabel)
if encoding != nil {
d := encoding.NewDecoder()
for _, sec := range f.Sections {
for _, l := range sec.Lines {
if c, _, err := transform.String(d, l.Content); err == nil {
l.Content = c
}
}
}
}
}
}
return diff, nil
}