/
commit.go
170 lines (149 loc) · 3.82 KB
/
commit.go
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package object
import (
"bufio"
"bytes"
"fmt"
"regexp"
"strconv"
"strings"
"time"
"github.com/JunNishimura/Goit/internal/sha"
)
var (
emailRegexpString = "([a-zA-Z0-9_.+-]+@([a-zA-Z0-9][a-zA-Z0-9-]*[a-zA-Z0-9]*\\.)+[a-zA-Z]{2,})"
timestampRegexpString = "([1-9][0-9]* [+-][0-9]{4})"
signRegexp = regexp.MustCompile("^[^<]* <" + emailRegexpString + "> " + timestampRegexpString + "$")
)
type Sign struct {
Name string
Email string
Timestamp time.Time
}
func (s Sign) String() string {
unixTime := s.Timestamp.Unix()
_, offsetSec := s.Timestamp.Zone()
offsetHour := offsetSec / 3600
offsetMinute := (offsetSec / 60) % 60
var posNegSign string
if offsetSec >= 0 {
posNegSign = "+"
} else {
posNegSign = "-"
}
offset := fmt.Sprintf("%s%02d%02d", posNegSign, offsetHour, offsetMinute)
return fmt.Sprintf("%s <%s> %s %s", s.Name, s.Email, fmt.Sprint(unixTime), offset)
}
func NewSign(name, email string) *Sign {
return &Sign{
Name: name,
Email: email,
Timestamp: time.Now(),
}
}
type Commit struct {
*Object
Tree sha.SHA1
Parents []sha.SHA1
Author Sign
Committer Sign
Message string
}
func NewCommit(o *Object) (*Commit, error) {
if o.Type != CommitObject {
return nil, ErrNotCommitObject
}
commit := &Commit{
Object: o,
}
buf := bytes.NewReader(o.Data)
scanner := bufio.NewScanner(buf)
for scanner.Scan() {
text := scanner.Text()
splitText := strings.SplitN(text, " ", 2)
if len(splitText) != 2 {
break
}
lineType := splitText[0]
body := splitText[1]
switch lineType {
case "tree":
hash, err := sha.ReadHash(body)
if err != nil {
return nil, err
}
commit.Tree = hash
case "parent":
hash, err := sha.ReadHash(body)
if err != nil {
return nil, err
}
commit.Parents = append(commit.Parents, hash)
case "author":
sign, err := readSign(body)
if err != nil {
return nil, err
}
commit.Author = sign
case "committer":
sign, err := readSign(body)
if err != nil {
return nil, err
}
commit.Committer = sign
}
}
message := make([]string, 0)
for scanner.Scan() {
message = append(message, scanner.Text())
}
commit.Message = strings.Join(message, "\n")
return commit, nil
}
func (c *Commit) String() string {
var commitString string
authorSignString := c.Author.String()
sign1 := strings.SplitN(authorSignString, " <", 2)
author := sign1[0]
sign2 := strings.SplitN(sign1[1], "> ", 2)
email := sign2[0]
commitString += fmt.Sprintf("commit %s\n", c.Hash)
commitString += fmt.Sprintf("Author: %s <%s>\n", author, email)
commitString += fmt.Sprintf("Date: %s\n", c.Author.Timestamp)
commitString += fmt.Sprintf("\n\t%s\n", c.Message)
return commitString
}
func readSign(signString string) (Sign, error) {
if ok := signRegexp.MatchString(signString); !ok {
return Sign{}, ErrInvalidCommitObject
}
sign1 := strings.SplitN(signString, " <", 2)
name := sign1[0]
sign2 := strings.SplitN(sign1[1], "> ", 2)
email := sign2[0]
sign3 := strings.SplitN(sign2[1], " ", 2)
unixTimeString := sign3[0]
offsetString := sign3[1]
unixTime, err := strconv.ParseInt(unixTimeString, 10, 64)
if err != nil {
return Sign{}, fmt.Errorf("%w: %s", ErrInvalidCommitObject, err)
}
var offsetHour, offsetMinute int
switch offsetString[:1] {
case "+":
if _, err := fmt.Sscanf(offsetString, "+%02d%02d", &offsetHour, &offsetMinute); err != nil {
return Sign{}, fmt.Errorf("%w: %s", ErrInvalidCommitObject, err)
}
case "-":
if _, err := fmt.Sscanf(offsetString, "-%02d%02d", &offsetHour, &offsetMinute); err != nil {
return Sign{}, fmt.Errorf("%w: %s", ErrInvalidCommitObject, err)
}
}
location := time.FixedZone(" ", 3600*offsetHour+60*offsetMinute)
timestamp := time.Unix(unixTime, 0).In(location)
sign := Sign{
Name: name,
Email: email,
Timestamp: timestamp,
}
return sign, nil
}