Add optional serde support for Metadata

Author: messense

Cargo.toml

@@ -16,5 +16,6 @@ bzip2 = "0.4.2"
 flate2 = "1.0.20"
 fs-err = "2.6.0"
 mailparse = "0.13.4"
+serde = { version = "1.0.126", features = ["derive"], optional = true }
 tar = "0.4.35"
 zip = "0.5.12"

src/metadata.rs

@@ -2,8 +2,11 @@ use std::str::FromStr;
 
 use crate::Error;
 use mailparse::MailHeaderMap;
+#[cfg(feature = "serde")]
+use serde::{Deserialize, Serialize};
 
 /// Python package metadata
+#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
 #[derive(Debug, Clone, Default, PartialEq)]
 pub struct Metadata {
     /// Version of the file format; legal values are `1.0`, `1.1`, `1.2`, `2.1` and `2.2`.