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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"fmt"
"os"
"regexp"
"strconv"
"strings"
)
type Commit struct {
num int // mercurial revision number
node string // mercurial hash
parent string // hash of commit's parent
user string // author's Name <email>
date string // date of commit
desc string // description
}
// getCommit returns details about the Commit specified by the revision hash
func getCommit(rev string) (c Commit, err os.Error) {
defer func() {
if err != nil {
err = fmt.Errorf("getCommit: %s: %s", rev, err)
}
}()
parts, err := getCommitParts(rev)
if err != nil {
return
}
num, err := strconv.Atoi(parts[0])
if err != nil {
return
}
parent := ""
if num > 0 {
prev := strconv.Itoa(num - 1)
if pparts, err := getCommitParts(prev); err == nil {
parent = pparts[1]
}
}
user := strings.Replace(parts[2], "<", "<", -1)
user = strings.Replace(user, ">", ">", -1)
return Commit{num, parts[1], parent, user, parts[3], parts[4]}, nil
}
func getCommitParts(rev string) (parts []string, err os.Error) {
const format = "{rev}>{node}>{author|escape}>{date}>{desc}"
s, _, err := runLog(nil, "", goroot,
"hg", "log",
"--encoding", "utf-8",
"--rev", rev,
"--limit", "1",
"--template", format,
)
if err != nil {
return
}
return strings.Split(s, ">", 5), nil
}
var revisionRe = regexp.MustCompile(`([0-9]+):[0-9a-f]+$`)
// getTag fetches a Commit by finding the first hg tag that matches re.
func getTag(re *regexp.Regexp) (c Commit, tag string, err os.Error) {
o, _, err := runLog(nil, "", goroot, "hg", "tags")
for _, l := range strings.Split(o, "\n", -1) {
tag = re.FindString(l)
if tag == "" {
continue
}
s := revisionRe.FindStringSubmatch(l)
if s == nil {
err = os.NewError("couldn't find revision number")
return
}
c, err = getCommit(s[1])
return
}
err = os.NewError("no matching tag found")
return
}
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