From c4d25bbcb7bfe180cee25bb918d73c5514285c56 Mon Sep 17 00:00:00 2001
From: Robin Mueller <robin.mueller.m@gmail.com>
Date: Mon, 3 Jun 2024 16:18:32 +0200
Subject: [PATCH] add optional defmt support

---
 Cargo.toml | 2 ++
 src/lib.rs | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/Cargo.toml b/Cargo.toml
index f526740..600526f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,6 +22,7 @@ keywords = ["date", "time", "monotonic", "tai", "gps"]
 chrono = { version = "0.4.31", default-features = false, optional = true }
 serde = { version = "1", default-features = false, features = ["derive"], optional = true }
 nix = { version = "0.26", default-features = false, features = ["time"], optional = true }
+defmt = { version = "0.3", optional = true }
 
 [features]
 default = ["std"]
@@ -30,6 +31,7 @@ std = []
 # activated since cargo resolver v2 ignores MSRV.
 chrono = ["dep:chrono"]
 serde = ["dep:serde"]
+defmt = ["dep:defmt"]
 tai_clock = ["dep:nix"]
 
 [package.metadata.docs.rs]
diff --git a/src/lib.rs b/src/lib.rs
index 1099dfb..06433dc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -82,6 +82,11 @@
 //! `TaiTime` and related error types can be (de)serialized with `serde` by
 //! activating the `serde` feature.
 //!
+//! ### `defmt` support
+//!
+//! Activating the `defmt` feature will add the
+//! [`defmt::Format`](https://defmt.ferrous-systems.com/format) derive on all important structures
+//! by this crate.
 //!
 //! # Examples
 //!
@@ -332,6 +337,7 @@ pub type Tai1972Time = TaiTime<63_072_000>;
 /// ```
 #[derive(Copy, Clone, Debug, Default, PartialEq, Eq, Hash, PartialOrd, Ord)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct TaiTime<const EPOCH_REF: i64> {
     /// The number of whole seconds in the future (if positive) or in the past
     /// (if negative) of 1970-01-01 00:00:00 TAI.