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package furgit
import (
"bytes"
"errors"
"fmt"
)
// Commit mirrors the structure of a Git commit object.
type Commit[T HashType] struct {
Hash Hash[T]
Tree Hash[T]
Parents []Hash[T]
Author Ident
Committer Ident
Message []byte
ExtraHeaders []ExtraHeader
}
// ObjType allows Commit to satisfy the Object interface.
func (*Commit[T]) ObjType() ObjType {
return ObjCommit
}
func parseCommit[T HashType](id Hash[T], body []byte) (*Commit[T], error) {
c := new(Commit[T])
c.Hash = id
i := 0
for i < len(body) {
rel := bytes.IndexByte(body[i:], '\n')
if rel < 0 {
return nil, errors.New("furgit: commit: missing newline")
}
line := body[i : i+rel]
i += rel + 1
if len(line) == 0 {
break
}
switch {
case bytes.HasPrefix(line, []byte("tree ")):
treeID, err := ParseHash[T](string(line[5:]))
if err != nil {
return nil, fmt.Errorf("furgit: commit: tree: %w", err)
}
c.Tree = treeID
case bytes.HasPrefix(line, []byte("parent ")):
parent, err := ParseHash[T](string(line[7:]))
if err != nil {
return nil, fmt.Errorf("furgit: commit: parent: %w", err)
}
c.Parents = append(c.Parents, parent)
case bytes.HasPrefix(line, []byte("author ")):
idt, err := parseIdent(line[7:])
if err != nil {
return nil, fmt.Errorf("furgit: commit: author: %w", err)
}
c.Author = *idt
case bytes.HasPrefix(line, []byte("committer ")):
idt, err := parseIdent(line[10:])
if err != nil {
return nil, fmt.Errorf("furgit: commit: committer: %w", err)
}
c.Committer = *idt
case bytes.HasPrefix(line, []byte("gpgsig ")), bytes.HasPrefix(line, []byte("gpgsig-sha256 ")):
// TODO: handle this
for i < len(body) {
nextRel := bytes.IndexByte(body[i:], '\n')
if nextRel < 0 {
return nil, errors.New("furgit: commit: unterminated gpgsig")
}
if body[i] != ' ' {
break
}
i += nextRel + 1
}
default:
key, value, found := bytes.Cut(line, []byte{' '})
if !found {
return nil, errors.New("furgit: commit: malformed header")
}
c.ExtraHeaders = append(c.ExtraHeaders, ExtraHeader{Key: string(key), Value: value})
}
}
if i > len(body) {
return nil, ErrInvalidObject
}
c.Message = append([]byte(nil), body[i:]...)
return c, nil
}
func commitBody[T HashType](c *Commit[T]) []byte {
var buf bytes.Buffer
fmt.Fprintf(&buf, "tree %s\n", c.Tree.String())
for _, p := range c.Parents {
fmt.Fprintf(&buf, "parent %s\n", p.String())
}
buf.WriteString("author ")
buf.Write(c.Author.Serialize())
buf.WriteByte('\n')
buf.WriteString("committer ")
buf.Write(c.Committer.Serialize())
buf.WriteByte('\n')
buf.WriteByte('\n')
buf.Write(c.Message)
return buf.Bytes()
}
// Serialize renders a Commit into canonical Git format.
func (c *Commit[T]) Serialize() ([]byte, error) {
body := commitBody(c)
header, err := headerForType(ObjCommit, body)
if err != nil {
return nil, err
}
raw := make([]byte, len(header)+len(body))
copy(raw, header)
copy(raw[len(header):], body)
return raw, nil
}
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