From 64dd15fcb941c096af93956e73492a062dd40bcd Mon Sep 17 00:00:00 2001
From: Paul Campbell <pcampbell@kemitix.net>
Date: Wed, 8 Jan 2025 21:05:51 +0000
Subject: [PATCH] feat: add newtype macro

---
 src/lib.rs     |  1 +
 src/newtype.rs | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+)
 create mode 100644 src/newtype.rs

diff --git a/src/lib.rs b/src/lib.rs
index 8337712..e6cae35 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1 +1,2 @@
 //
+mod newtype;
diff --git a/src/newtype.rs b/src/newtype.rs
new file mode 100644
index 0000000..e5c2f99
--- /dev/null
+++ b/src/newtype.rs
@@ -0,0 +1,56 @@
+//
+#[macro_export]
+macro_rules! newtype {
+    ($name:ident, $docs:literal) => {
+        #[doc = $docs]
+        #[derive(
+            Clone,
+            Copy,
+            Default,
+            Debug,
+            derive_more::Display,
+            derive_more::From,
+            PartialEq,
+            Eq,
+            PartialOrd,
+            Ord,
+            Hash,
+            derive_more::AsRef,
+            derive_more::Constructor,
+            serde::Serialize,
+            serde::Deserialize,
+        )]
+        pub struct $name;
+    };
+    ($name:ident, $type:ty $(, $derive:ty)*, $docs:literal) => {
+        #[doc = $docs]
+        #[derive(
+            Clone,
+            Debug,
+            derive_more::From,
+            PartialEq,
+            Eq,
+            derive_more::AsRef,
+            derive_more::Deref,
+            serde::Serialize,
+            serde::Deserialize,
+            $($derive),*
+        )]
+        pub struct $name($type);
+        impl $name {
+            pub fn new(value: impl Into<$type>) -> Self {
+                Self(value.into())
+            }
+            #[allow(clippy::missing_const_for_fn)]
+            #[must_use]
+            pub fn peel(self) -> $type {
+                self.0
+            }
+        }
+        impl From<$name> for $type {
+            fn from(value: $name) -> $type {
+                value.peel()
+            }
+        }
+    };
+}