1 files changed, 33 insertions, 0 deletions
diff --git a/object/signature/serialize.go b/object/signature/serialize.go
new file mode 100644
index 00000000..3f60d20d
--- /dev/null
+++ b/object/signature/serialize.go
@@ -0,0 +1,33 @@
+package signature
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+// Serialize renders the signature in canonical Git format.
+func (signature Signature) Serialize() ([]byte, error) {
+	var b strings.Builder
+	b.Grow(len(signature.Name) + len(signature.Email) + 32)
+	b.Write(signature.Name)
+	b.WriteString(" <")
+	b.Write(signature.Email)
+	b.WriteString("> ")
+	b.WriteString(strconv.FormatInt(signature.WhenUnix, 10))
+	b.WriteByte(' ')
+
+	offset := signature.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
+}