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go/src/infra/libs/git/user.go

+// Copyright 2014 The Chromium 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 git
+
+import (
+        "fmt"
+        "regexp"
+        "strconv"
+        "time"
+)
+
+// Types ///////////////////////////////////////////////////////////////////////
+
+// User represents an author/committer line in a Commit
+type User struct {
+        Name  string
+        Email string
+        Time  time.Time
+}
+
+// Constructors ////////////////////////////////////////////////////////////////
+
+func MakeUserFromCommitLine(lineType, line string) (User, error) {
+        fields := userRegex.FindStringSubmatch(line)
+        if len(fields) == 0 {
+                return User{}, fmt.Errorf("Incompatible user line: %#v", line)
+        }
+        if fields[1] != lineType {
+                return User{}, fmt.Errorf("Expected to parse %s but got %s instead", lineType, fields[1])
+        }
+        t, err := time.Parse("-0700", fields[5])
+        if err != nil {
+                return User{}, err
+        }
+
+        timecode, err := strconv.ParseInt(fields[4], 10, 64)
+        if err != nil {
+                return User{}, err
+        }
+
+        return User{
+                Name:  fields[2],
+                Email: fields[3],
+                Time:  time.Unix(timecode, 0).In(t.Location()),
+        }, nil
+}
+
+// Member functions ////////////////////////////////////////////////////////////
+
+// RawString returns a `git hash-object` compatible string for this User
+func (u *User) RawString() string {
+        return fmt.Sprintf("%s <%s> %d %s", u.Name, u.Email, u.Time.Unix(),
+                u.Time.Format("-0700"))
+}
+
+// Private /////////////////////////////////////////////////////////////////////
+
+// author|committer SP <user_name> SP '<' <user_email> '>' SP timecode +0000
+// I would use named groups, but the interface to access them is terrible
+// in the regexp package...
+var userRegex = regexp.MustCompile(
+        `^(author|committer) ` +
+                `([^<]*) ` + // user_name
+                `<([^>]*)> ` + // user_email
+                `(\d*) ` + // timecode
+                `([+-]\d{4})$`) //timezone