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// Copyright 2017 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package email
import (
"bufio"
"fmt"
"strings"
)
func ParsePatch(text string) (title string, diff string, err error) {
s := bufio.NewScanner(strings.NewReader(text))
parsingDiff := false
diffStarted := false
lastLine := ""
for s.Scan() {
ln := s.Text()
if strings.HasPrefix(ln, "--- a/") || strings.HasPrefix(ln, "--- /dev/null") {
parsingDiff = true
if title == "" {
title = lastLine
}
}
if parsingDiff {
if ln == "" || ln == "--" || ln == "-- " || ln[0] == '>' ||
ln[0] >= 'A' && ln[0] <= 'Z' {
break
}
diff += ln + "\n"
continue
}
if strings.HasPrefix(ln, "diff --git") {
diffStarted = true
continue
}
if strings.HasPrefix(ln, "Subject: ") {
title = ln[len("Subject: "):]
continue
}
if ln == "" || title != "" || diffStarted {
continue
}
lastLine = ln
if strings.HasPrefix(ln, " ") {
title = ln[4:]
}
}
if err = s.Err(); err != nil {
return
}
if strings.Contains(strings.ToLower(title), "[patch") {
pos := strings.IndexByte(title, ']')
if pos == -1 {
err = fmt.Errorf("title contains '[patch' but not ']'")
return
}
title = title[pos+1:]
}
title = strings.TrimSpace(title)
if title == "" {
err = fmt.Errorf("failed to extract title")
return
}
if diff == "" {
err = fmt.Errorf("failed to extract diff")
return
}
return
}
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