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package object
import (
"bytes"
"errors"
"fmt"
"codeberg.org/lindenii/furgit/objectid"
)
// ParseCommit decodes a commit object body.
func ParseCommit(body []byte, algo objectid.Algorithm) (*Commit, error) {
c := new(Commit)
i := 0
for i < len(body) {
rel := bytes.IndexByte(body[i:], '\n')
if rel < 0 {
return nil, errors.New("object: commit: missing newline")
}
line := body[i : i+rel]
i += rel + 1
if len(line) == 0 {
break
}
key, value, found := bytes.Cut(line, []byte{' '})
if !found {
return nil, errors.New("object: commit: malformed header")
}
switch string(key) {
case "tree":
id, err := objectid.ParseHex(algo, string(value))
if err != nil {
return nil, fmt.Errorf("object: commit: tree: %w", err)
}
c.Tree = id
case "parent":
id, err := objectid.ParseHex(algo, string(value))
if err != nil {
return nil, fmt.Errorf("object: commit: parent: %w", err)
}
c.Parents = append(c.Parents, id)
case "author":
idt, err := ParseSignature(value)
if err != nil {
return nil, fmt.Errorf("object: commit: author: %w", err)
}
c.Author = *idt
case "committer":
idt, err := ParseSignature(value)
if err != nil {
return nil, fmt.Errorf("object: commit: committer: %w", err)
}
c.Committer = *idt
case "change-id":
c.ChangeID = string(value)
case "gpgsig", "gpgsig-sha256":
for i < len(body) {
nextRel := bytes.IndexByte(body[i:], '\n')
if nextRel < 0 {
return nil, errors.New("object: commit: unterminated gpgsig")
}
if body[i] != ' ' {
break
}
i += nextRel + 1
}
default:
c.ExtraHeaders = append(c.ExtraHeaders, ExtraHeader{
Key: string(key),
Value: append([]byte(nil), value...),
})
}
}
if i > len(body) {
return nil, errors.New("object: commit: parser position out of bounds")
}
c.Message = append([]byte(nil), body[i:]...)
return c, nil
}
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