fix(macros/generate/host): Add unified support for conversions

These include from the c type to rust, vice versa.

src/macros/generate/convert/host/c/enumeration/mod.rs

@@ -35,24 +35,7 @@ impl Enumeration {
             .collect();
 
         let states: Vec<TokenStream2> = self.states.iter().map(DocIdentifier::to_rust).collect();
-        let paired_type = {
-            let path = &self
-                .identifier
-                .variant
-                .to_rust_path()
-                .expect("This should always be some for enums");
-
-            let ident = &self.identifier.to_rust();
-            if path.is_empty() {
-                quote! {
-                    crate :: #ident
-                }
-            } else {
-                quote! {
-                    #path :: #ident
-                }
-            }
-        };
+        let paired_type = self.identifier.to_rust_paired();
 
         let convertible = &self.derive_from_c_paried_rust(&paired_type);
         quote! {

src/macros/generate/convert/host/c/identifier/mod.rs

@@ -21,7 +21,7 @@
 */
 
 use proc_macro2::TokenStream as TokenStream2;
-use quote::{format_ident, ToTokens};
+use quote::{format_ident, quote, ToTokens};
 
 use crate::parser::command_spec::Identifier;
 
@@ -45,4 +45,18 @@ impl Identifier {
     pub fn to_c(&self) -> TokenStream2 {
         format_ident!("{}_c", self.name).to_token_stream()
     }
+
+    pub fn to_c_paired(&self) -> TokenStream2 {
+        let path = &self.variant.to_c_path();
+        let ident = &self.to_c();
+        if path.is_empty() {
+            quote! {
+                crate :: #ident
+            }
+        } else {
+            quote! {
+                #path :: #ident
+            }
+        }
+    }
 }

src/macros/generate/convert/host/c/structure/mod.rs

@@ -36,7 +36,9 @@ impl Structure {
 
         let contents: Vec<TokenStream2> = self.contents.iter().map(DocNamedType::to_c).collect();
 
-        // TODO: Convertible <2024-03-08>
+        let paired_type = self.identifier.to_rust_paired();
+
+        let into_impl = &self.derive_from_c_paired_rust(&paired_type);
         quote! {
             #doc_comments
             #[allow(non_camel_case_types)]
@@ -45,6 +47,7 @@ impl Structure {
             pub struct #ident {
                 #(#contents),*
             }
+            #into_impl
         }
     }
 }

src/macros/generate/convert/host/rust/derive/enumeration.rs

@@ -29,7 +29,7 @@ impl Enumeration {
     fn derive_from_paired(
         &self,
         ident_self: &TokenStream2,
-        ident_paired: &TokenStream2,
+        _ident_paired: &TokenStream2,
         paired_type: &TokenStream2,
     ) -> TokenStream2 {
         let match_lines: TokenStream2 = self
@@ -38,7 +38,7 @@ impl Enumeration {
             .map(|state| {
                 let name = Into::<Identifier>::into(state).to_rust();
                 quote! {
-                    #ident_paired :: #name => Self :: #name,
+                    #paired_type :: #name => Self :: #name,
                 }
             })
             .collect();

src/macros/generate/convert/host/rust/derive/structure.rs

@@ -60,23 +60,26 @@ impl Structure {
     }
 
     /// This function generates the `TryFrom<paired_type>` trait implementation for a given structure
-    // was: `structure_into_impl`
-    pub fn derive_into_impl(&self, paired_type: &TokenStream2) -> TokenStream2 {
-        let ident = self.identifier.to_rust();
-
+    /// This function is more low-level, prefer to use the [`derive_from_c_paired_rust`] and
+    /// [`derive_from_rust_paired_c`] functions instead.
+    pub fn derive_from_paired(
+        &self,
+        ident_self: &TokenStream2,
+        paired_type: &TokenStream2,
+    ) -> TokenStream2 {
         let try_into_fields: TokenStream2 = self
             .contents
             .iter()
-            .map(|con| {
-                let ident = &con.name.to_rust();
+            .map(|content| {
+                let name = content.name.to_rust();
                 quote! {
-                    #ident: value.#ident.try_into()?,
+                    // #paired_type :: #name => Self :: #name,
+                    #name: value.#name.try_into()?,
                 }
             })
             .collect();
-
         quote! {
-            impl TryFrom<#paired_type> for #ident {
+            impl TryFrom<#paired_type> for #ident_self {
                 type Error = trixy::types::error::TypeConversionError;
 
                 fn try_from(value: #paired_type) -> Result<Self, Self::Error> {
@@ -87,4 +90,20 @@ impl Structure {
             }
         }
     }
+
+    /// This function generates the `TryFrom<paired_type>` trait implementation for a given c
+    /// structure
+    pub fn derive_from_c_paired_rust(&self, paired_rust_type: &TokenStream2) -> TokenStream2 {
+        let c_ident = self.identifier.to_c();
+
+        self.derive_from_paired(&c_ident, &paired_rust_type)
+    }
+
+    /// This function generates the `TryFrom<paired_type>` trait implementation for a given rust
+    /// structure
+    pub fn derive_from_rust_paired_c(&self, paired_c_type: &TokenStream2) -> TokenStream2 {
+        let rust_ident = self.identifier.to_rust();
+
+        self.derive_from_paired(&rust_ident, &paired_c_type)
+    }
 }

src/macros/generate/convert/host/rust/identifier/mod.rs

@@ -48,4 +48,22 @@ impl Identifier {
             #pascal_ident
         }
     }
+
+    pub fn to_rust_paired(&self) -> TokenStream2 {
+        let path = &self
+            .variant
+            .to_rust_path()
+            .expect("This should be generatable, when this function is called");
+
+        let ident = &self.to_rust();
+        if path.is_empty() {
+            quote! {
+                crate :: #ident
+            }
+        } else {
+            quote! {
+                #path :: #ident
+            }
+        }
+    }
 }

src/macros/generate/convert/host/rust/structure/mod.rs

@@ -34,22 +34,11 @@ impl Structure {
             .collect();
 
         let ident = &self.identifier.to_rust();
-        let c_ident = {
-            let path = &self.identifier.variant.to_c_path();
-            let ident = &self.identifier.to_c();
-            if path.is_empty() {
-                quote! {
-                    crate :: #ident
-                }
-            } else {
-                quote! {
-                    #path :: #ident
-                }
-            }
-        };
         let contents: Vec<TokenStream2> = self.contents.iter().map(DocNamedType::to_rust).collect();
+
+        let c_ident = self.identifier.to_c_paired();
         let convertible = self.derive_convertible(&c_ident);
-        let into_impl = self.derive_into_impl(&c_ident);
+        let into_impl = self.derive_from_rust_paired_c(&c_ident);
 
         quote! {
             #doc_comments