1 files changed, 84 insertions, 0 deletions
diff --git a/object/commit/serialize.go b/object/commit/serialize.go
new file mode 100644
index 00000000..721cacf6
--- /dev/null
+++ b/object/commit/serialize.go
@@ -0,0 +1,84 @@
+package commit
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+
+	objectheader "codeberg.org/lindenii/furgit/object/header"
+	objecttype "codeberg.org/lindenii/furgit/object/type"
+)
+
+// SerializeWithoutHeader renders the raw commit body bytes.
+func (commit *Commit) SerializeWithoutHeader() ([]byte, error) {
+	var buf bytes.Buffer
+
+	if commit.Tree.Size() == 0 {
+		return nil, errors.New("object: commit: missing tree id")
+	}
+
+	fmt.Fprintf(&buf, "tree %s\n", commit.Tree.String())
+
+	for _, parent := range commit.Parents {
+		fmt.Fprintf(&buf, "parent %s\n", parent.String())
+	}
+
+	authorBytes, err := commit.Author.Serialize()
+	if err != nil {
+		return nil, err
+	}
+
+	buf.WriteString("author ")
+	buf.Write(authorBytes)
+	buf.WriteByte('\n')
+
+	committerBytes, err := commit.Committer.Serialize()
+	if err != nil {
+		return nil, err
+	}
+
+	buf.WriteString("committer ")
+	buf.Write(committerBytes)
+	buf.WriteByte('\n')
+
+	if commit.ChangeID != "" {
+		buf.WriteString("change-id ")
+		buf.WriteString(commit.ChangeID)
+		buf.WriteByte('\n')
+	}
+
+	for _, h := range commit.ExtraHeaders {
+		if h.Key == "" {
+			return nil, errors.New("object: commit: extra header has empty key")
+		}
+
+		buf.WriteString(h.Key)
+		buf.WriteByte(' ')
+		buf.Write(h.Value)
+		buf.WriteByte('\n')
+	}
+
+	buf.WriteByte('\n')
+	buf.Write(commit.Message)
+
+	return buf.Bytes(), nil
+}
+
+// SerializeWithHeader renders the raw object (header + body).
+func (commit *Commit) SerializeWithHeader() ([]byte, error) {
+	body, err := commit.SerializeWithoutHeader()
+	if err != nil {
+		return nil, err
+	}
+
+	header, ok := objectheader.Encode(objecttype.TypeCommit, int64(len(body)))
+	if !ok {
+		return nil, errors.New("object: commit: failed to encode object header")
+	}
+
+	raw := make([]byte, len(header)+len(body))
+	copy(raw, header)
+	copy(raw[len(header):], body)
+
+	return raw, nil
+}