1 files changed, 162 insertions, 0 deletions
diff --git a/mingling_macros/src/pack.rs b/mingling_macros/src/pack.rs
new file mode 100644
index 0000000..bff67d4
--- /dev/null
+++ b/mingling_macros/src/pack.rs
@@ -0,0 +1,162 @@
+//! Chain Struct Macro Implementation
+//!
+//! This module provides the `pack!` macro for creating wrapper types
+//! with automatic implementations of common traits.
+
+use proc_macro::TokenStream;
+use quote::quote;
+use syn::parse::{Parse, ParseStream};
+use syn::{Ident, Result as SynResult, Token, Type};
+
+/// Parses input in the format: `TypeName = InnerType`
+struct PackInput {
+    type_name: Ident,
+    inner_type: Type,
+}
+
+impl Parse for PackInput {
+    fn parse(input: ParseStream) -> SynResult<Self> {
+        let type_name = input.parse()?;
+        input.parse::<Token![=]>()?;
+        let inner_type = input.parse()?;
+
+        Ok(PackInput {
+            type_name,
+            inner_type,
+        })
+    }
+}
+
+pub fn pack(input: TokenStream) -> TokenStream {
+    let PackInput {
+        type_name,
+        inner_type,
+    } = syn::parse_macro_input!(input as PackInput);
+
+    // Generate the struct definition
+    #[cfg(not(feature = "serde"))]
+    let struct_def = quote! {
+        #[derive(Debug)]
+        pub struct #type_name {
+            inner: #inner_type,
+        }
+    };
+
+    #[cfg(feature = "serde")]
+    let struct_def = quote! {
+        #[derive(Debug, serde::Serialize)]
+        pub struct #type_name {
+            inner: #inner_type,
+        }
+    };
+
+    // Generate the new() method
+    let new_impl = quote! {
+        impl #type_name {
+            /// Creates a new instance of the wrapper type
+            pub fn new(inner: #inner_type) -> Self {
+                Self { inner }
+            }
+        }
+    };
+
+    // Generate From and Into implementations
+    let from_into_impl = quote! {
+        impl From<#inner_type> for #type_name {
+            fn from(inner: #inner_type) -> Self {
+                Self::new(inner)
+            }
+        }
+
+        impl From<#type_name> for #inner_type {
+            fn from(wrapper: #type_name) -> #inner_type {
+                wrapper.inner
+            }
+        }
+    };
+
+    // Generate AsRef and AsMut implementations
+    let as_ref_impl = quote! {
+        impl ::std::convert::AsRef<#inner_type> for #type_name {
+            fn as_ref(&self) -> &#inner_type {
+                &self.inner
+            }
+        }
+
+        impl ::std::convert::AsMut<#inner_type> for #type_name {
+            fn as_mut(&mut self) -> &mut #inner_type {
+                &mut self.inner
+            }
+        }
+    };
+
+    // Generate Deref and DerefMut implementations
+    let deref_impl = quote! {
+        impl ::std::ops::Deref for #type_name {
+            type Target = #inner_type;
+
+            fn deref(&self) -> &Self::Target {
+                &self.inner
+            }
+        }
+
+        impl ::std::ops::DerefMut for #type_name {
+            fn deref_mut(&mut self) -> &mut Self::Target {
+                &mut self.inner
+            }
+        }
+    };
+
+    // Check if the inner type implements Default by generating conditional code
+    let default_impl = quote! {
+        impl ::std::default::Default for #type_name
+        where
+            #inner_type: ::std::default::Default,
+        {
+            fn default() -> Self {
+                Self::new(::std::default::Default::default())
+            }
+        }
+    };
+
+    let any_out_impl = quote! {
+        impl Into<mingling::AnyOutput> for #type_name {
+            fn into(self) -> mingling::AnyOutput {
+                mingling::AnyOutput::new(self)
+            }
+        }
+
+        impl Into<mingling::ChainProcess> for #type_name {
+            fn into(self) -> mingling::ChainProcess {
+                mingling::AnyOutput::new(self).route_chain()
+            }
+        }
+
+        impl #type_name {
+            /// Converts the wrapper type into a `ChainProcess` for chaining operations.
+            pub fn to_chain(self) -> mingling::ChainProcess {
+                mingling::AnyOutput::new(self).route_chain()
+            }
+
+            /// Converts the wrapper type into a `ChainProcess` for rendering operations.
+            pub fn to_render(self) -> mingling::ChainProcess {
+                mingling::AnyOutput::new(self).route_renderer()
+            }
+        }
+    };
+
+    // Combine all implementations
+    let expanded = quote! {
+        #struct_def
+
+        #new_impl
+        #from_into_impl
+        #as_ref_impl
+        #deref_impl
+        #default_impl
+
+        #any_out_impl
+    };
+
+    expanded.into()
+}