update, fixed all warnings, proc macros both work with enums now

src/lib.rs

@@ -1,4 +1,3 @@
-use async_trait::async_trait;
 use proc_macro::TokenStream;
 use quote::quote;
 use syn::{parse_macro_input, ItemEnum, Lit, DeriveInput, Fields, Data};
@@ -8,22 +7,23 @@ pub fn derive_http_get_request(input: TokenStream) -> TokenStream {
     let input = parse_macro_input!(input as DeriveInput);
     let name = &input.ident;
 
-    // Extract the base URL from #[http_get(url = "...")]
-    let mut base_url = None;
+    // Extract base_url from #[http_get(url = "...")]
+    let mut base_url_lit = None;
     for attr in &input.attrs {
         if attr.path().is_ident("http_get") {
             let _ = attr.parse_nested_meta(|meta| {
                 if meta.path.is_ident("url") {
                     let value: Lit = meta.value()?.parse()?;
                     if let Lit::Str(litstr) = value {
-                        base_url = Some(litstr.value());
+                        base_url_lit = Some(litstr);
                     }
                 }
                 Ok(())
             });
         }
     }
-    let base_url = base_url.expect("Missing #[http_get(url = \"...\")] attribute");
+
+    let base_url_lit = base_url_lit.expect("Missing #[http_get(url = \"...\")] attribute");
 
     let expanded = match &input.data {
         Data::Struct(data_struct) => {
@@ -32,23 +32,23 @@ pub fn derive_http_get_request(input: TokenStream) -> TokenStream {
                 _ => panic!("#[derive(HttpRequest)] only supports structs with named fields"),
             };
 
-            let mut query_param_code = Vec::new();
-            for field in fields {
+            let query_param_code: Vec<_> = fields.iter().filter_map(|field| {
                 let ident = field.ident.clone().unwrap();
                 let field_name = ident.to_string();
                 if field_name.starts_with("lnk_p_") {
                     let key = &field_name["lnk_p_".len()..];
-                    query_param_code.push(quote! {
+                    Some(quote! {
                         query_params.push((#key.to_string(), self.#ident.to_string()));
-                    });
+                    })
+                } else {
+                    None
                 }
-            }
+            }).collect();
 
             quote! {
                 impl Queryable for #name {
                     fn send(
                         &self,
-                        base_url: &str,
                         headers: Option<Vec<(&str, &str)>>,
                     ) -> Result<Response, std::io::Error> {
                         use urlencoding::encode;
@@ -57,7 +57,7 @@ pub fn derive_http_get_request(input: TokenStream) -> TokenStream {
                         let mut query_params: Vec<(String, String)> = Vec::new();
                         #(#query_param_code)*
 
-                        let mut url = base_url.to_string();
+                        let mut url = #base_url_lit.to_string();
                         if !query_params.is_empty() {
                             let query_parts: Vec<String> = query_params.iter()
                                 .map(|(k, v)| format!("{}={}", k, encode(v)))
@@ -93,24 +93,22 @@ pub fn derive_http_get_request(input: TokenStream) -> TokenStream {
         }
 
         Data::Enum(data_enum) => {
-            let mut variant_arms = Vec::new();
-            for variant in &data_enum.variants {
+            let variant_arms: Vec<_> = data_enum.variants.iter().map(|variant| {
                 let vname = &variant.ident;
                 match &variant.fields {
                     Fields::Unnamed(fields) if fields.unnamed.len() == 1 => {
-                        variant_arms.push(quote! {
-                            #name::#vname(inner) => inner.send(base_url, headers.clone()),
-                        });
+                        quote! {
+                            #name::#vname(inner) => inner.send(headers.clone()),
+                        }
                     }
                     _ => panic!("#[derive(HttpRequest)] enum variants must have a single unnamed field"),
                 }
-            }
+            }).collect();
 
             quote! {
                 impl Queryable for #name {
                     fn send(
                         &self,
-                        base_url: &str,
                         headers: Option<Vec<(&str, &str)>>,
                     ) -> Result<Response, std::io::Error> {
                         match self {
@@ -146,7 +144,37 @@ pub fn derive_http_response(input: TokenStream) -> TokenStream {
             }
         }
 
-        _ => panic!("#[derive(HttpResponse)] only supports structs"),
+        Data::Enum(enum_data) => {
+            let match_arms = enum_data.variants.iter().filter_map(|v| {
+                let variant_name = &v.ident;
+                match &v.fields {
+                    syn::Fields::Unnamed(fields) if fields.unnamed.len() == 1 => {
+                        let inner_ty = &fields.unnamed.first().unwrap().ty;
+                        Some(quote! {
+                            if let Ok(inner) = <#inner_ty as Responsable>::receive(resp) {
+                                return Ok(#name::#variant_name(inner));
+                            }
+                        })
+                    }
+                    _ => None
+                }
+            });
+
+            quote! {
+                impl Responsable for #name {
+                    fn receive(resp: actix_web::ClientResponse) -> Result<Self, std::error::Error> {
+                        #(#match_arms)*
+
+                        Err(std::io::Error::new(
+                            std::io::ErrorKind::Other,
+                            format!("No matching variant found for {}", stringify!(#name)),
+                        ).into())
+                    }
+                }
+            }
+        }
+
+        _ => panic!("#[derive(HttpResponse)] only supports structs and enums with tuple variants"),
     };
 
     TokenStream::from(expanded)