From 72ff23ac0b2ce50b91ce29eb7155904d3a619937 Mon Sep 17 00:00:00 2001
From: griffi-gh <prasol258@gmail.com>
Date: Mon, 25 Mar 2024 17:49:32 +0100
Subject: [PATCH] add derive macro for `Signal`

---
 Cargo.toml            |  2 +-
 hui-derive/Cargo.toml | 23 +++++++++++++++++++++++
 hui-derive/src/lib.rs | 12 ++++++++++++
 hui/Cargo.toml        |  8 ++++----
 hui/src/input.rs      |  2 ++
 hui/src/lib.rs        |  7 +++++--
 6 files changed, 47 insertions(+), 7 deletions(-)
 create mode 100644 hui-derive/Cargo.toml
 create mode 100644 hui-derive/src/lib.rs

diff --git a/Cargo.toml b/Cargo.toml
index fc21b5f..5db48b7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,3 +1,3 @@
 [workspace]
 resolver = "2"
-members = ["hui", "hui-examples", "hui-glium", "hui-winit"]
+members = ["hui", "hui-derive", "hui-examples", "hui-glium", "hui-winit"]
diff --git a/hui-derive/Cargo.toml b/hui-derive/Cargo.toml
new file mode 100644
index 0000000..b26f457
--- /dev/null
+++ b/hui-derive/Cargo.toml
@@ -0,0 +1,23 @@
+[package]
+name = "hui-derive"
+description = "Derive macros for hUI"
+repository = "https://github.com/griffi-gh/hui"
+readme = "../README.md"
+authors = ["griffi-gh <prasol258@gmail.com>"]
+rust-version = "1.75"
+version = "0.1.0-alpha.4"
+edition = "2021"
+license = "GPL-3.0-or-later"
+publish = true
+include = [
+  "assets/**/*",
+  "src/**/*.rs",
+  "Cargo.toml",
+]
+
+[lib]
+proc-macro = true
+
+[dependencies]
+quote = "1.0"
+syn = "2.0"
diff --git a/hui-derive/src/lib.rs b/hui-derive/src/lib.rs
new file mode 100644
index 0000000..637b0a6
--- /dev/null
+++ b/hui-derive/src/lib.rs
@@ -0,0 +1,12 @@
+extern crate proc_macro;
+
+use proc_macro::TokenStream;
+use quote::quote;
+use syn::{parse_macro_input, DeriveInput};
+
+#[proc_macro_derive(Signal)]
+pub fn signal(input: TokenStream) -> TokenStream {
+  let input = parse_macro_input!(input as DeriveInput);
+  let name = input.ident;
+  quote!(impl ::hui::signal::Signal for #name {}).into()
+}
diff --git a/hui/Cargo.toml b/hui/Cargo.toml
index a07657a..b450a95 100644
--- a/hui/Cargo.toml
+++ b/hui/Cargo.toml
@@ -16,6 +16,7 @@ include = [
 ]
 
 [dependencies]
+hui-derive = { version = "0.1.0-alpha.4", path = "../hui-derive", optional = true }
 hashbrown = "0.14"
 nohash-hasher = "0.2"
 glam = "0.27"
@@ -29,15 +30,14 @@ tinyset = "0.4"
 image = { version = "0.25", default-features = false, optional = true }
 
 [features]
-default = ["el_all", "image", "builtin_font", "pixel_perfect_text"]
+default = ["el_all", "image", "builtin_font", "pixel_perfect_text", "derive"]
 
-#! Image loading support:
+## Enable derive macros
+derive = ["dep:hui-derive"]
 
 ## Enable image loading support using the `image` crate
 image = ["dep:image"]
 
-#! #### Built-in font:
-
 ## Enable the built-in font (ProggyTiny, adds *35kb* to the executable)
 builtin_font = []
 
diff --git a/hui/src/input.rs b/hui/src/input.rs
index 45e4cc5..8154e81 100644
--- a/hui/src/input.rs
+++ b/hui/src/input.rs
@@ -101,6 +101,8 @@ pub enum KeyboardKey {
 macro_rules! impl_fits64_for_keyboard_key {
   ($($i:ident = $v:literal),*) => {
     impl Fits64 for KeyboardKey {
+      // SAFETY: not actually doing anything unsafe
+      #[allow(unsafe_code)]
       unsafe fn from_u64(x: u64) -> Self {
         match x {
           $( $v => KeyboardKey::$i, )*
diff --git a/hui/src/lib.rs b/hui/src/lib.rs
index 42cbe65..fe61bb5 100644
--- a/hui/src/lib.rs
+++ b/hui/src/lib.rs
@@ -5,9 +5,12 @@
 //! # Features
 #![doc = document_features::document_features!()]
 
-#![allow(unused_parens)]
-//#![forbid(unsafe_code)]
+#![deny(unsafe_code)]
 #![forbid(unsafe_op_in_unsafe_fn)]
+#![allow(unused_parens)]
+
+#[cfg(feature = "derive")]
+pub use hui_derive::*;
 
 mod instance;
 mod macros;