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package furgit
import (
"bytes"
"errors"
"fmt"
"math"
"strconv"
"strings"
"time"
)
// Ident models an author/committer identity together with its timestamp
// and timezone offset, mirroring the fields that appear in Git objects.
type Ident struct {
Name []byte
Email []byte
WhenUnix int64
OffsetMinutes int32
}
// parseIdent parses an identity line from the canonical Git format:
// "Name <email> 123456789 +0000".
func parseIdent(line []byte) (*Ident, error) {
lt := bytes.IndexByte(line, '<')
if lt < 0 {
return nil, errors.New("furgit: ident: missing opening <")
}
gtRel := bytes.IndexByte(line[lt+1:], '>')
if gtRel < 0 {
return nil, errors.New("furgit: ident: missing closing >")
}
gt := lt + 1 + gtRel
nameBytes := append([]byte(nil), line[:lt]...)
emailBytes := append([]byte(nil), line[lt+1:gt]...)
rest := line[gt+1:]
if len(rest) == 0 || rest[0] != ' ' {
return nil, errors.New("furgit: ident: missing timestamp separator")
}
rest = rest[1:]
sp := bytes.IndexByte(rest, ' ')
if sp < 0 {
return nil, errors.New("furgit: ident: missing timezone separator")
}
whenStr := string(rest[:sp])
when, err := strconv.ParseInt(whenStr, 10, 64)
if err != nil {
return nil, fmt.Errorf("furgit: ident: invalid timestamp: %w", err)
}
tz := rest[sp+1:]
if len(tz) < 5 {
return nil, errors.New("furgit: ident: invalid timezone encoding")
}
sign := 1
switch tz[0] {
case '-':
sign = -1
case '+':
default:
return nil, errors.New("furgit: ident: invalid timezone sign")
}
hh, err := strconv.Atoi(string(tz[1:3]))
if err != nil {
return nil, fmt.Errorf("furgit: ident: invalid timezone hours: %w", err)
}
mm, err := strconv.Atoi(string(tz[3:5]))
if err != nil {
return nil, fmt.Errorf("furgit: ident: invalid timezone minutes: %w", err)
}
if hh < 0 || hh > 23 {
return nil, errors.New("furgit: ident: invalid timezone hours range")
}
if mm < 0 || mm > 59 {
return nil, errors.New("furgit: ident: invalid timezone minutes range")
}
total := int64(hh)*60 + int64(mm)
if total > math.MaxInt32 {
return nil, errors.New("furgit: ident: timezone overflow")
}
offset := int32(total)
if sign < 0 {
offset = -offset
}
return &Ident{
Name: nameBytes,
Email: emailBytes,
WhenUnix: when,
OffsetMinutes: offset,
}, nil
}
// Serialize renders an Ident into canonical Git format.
func (ident Ident) Serialize() ([]byte, error) {
var b strings.Builder
b.Grow(len(ident.Name) + len(ident.Email) + 32)
b.Write(ident.Name)
b.WriteString(" <")
b.Write(ident.Email)
b.WriteString("> ")
b.WriteString(strconv.FormatInt(ident.WhenUnix, 10))
b.WriteByte(' ')
offset := ident.OffsetMinutes
sign := '+'
if offset < 0 {
sign = '-'
offset = -offset
}
hh := offset / 60
mm := offset % 60
fmt.Fprintf(&b, "%c%02d%02d", sign, hh, mm)
return []byte(b.String()), nil
}
// When returns the timestamp as time.Time using the embedded offset.
func (ident Ident) When() time.Time {
loc := time.FixedZone("git", int(ident.OffsetMinutes)*60)
return time.Unix(ident.WhenUnix, 0).In(loc)
}
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