trying macros

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "medusa_macros"
+version = "0.1.0"
+dependencies = [
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.86"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5e719e8df665df0d1c8fbfd238015744736151d4445ec0836b8e628aae103b77"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.37"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5b9d34b8991d19d98081b46eacdd8eb58c6f2b201139f7c5f643cc155a633af"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.77"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9f35bcdf61fd8e7be6caf75f429fdca8beb3ed76584befb503b1569faee373ed"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"

Cargo.toml

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+[package]
+name = "medusa_macros"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+syn = { version = "2.0.77",  features = ["full"] }
+quote = "1.0.37"

src/handler.rs

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+
+pub struct Handler {
+    pub module: &'static str,
+    pub method: &'static str,
+    pub handle: fn(model: &str, body: &str) -> Pin<Box<dyn Future<Output = String> + Send>>,
+}

src/lib.rs

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+extern crate proc_macro;
+
+use proc_macro::TokenStream;
+use quote::quote;
+use syn::{parse_macro_input, punctuated::Punctuated, LitStr, Token};
+
+#[proc_macro_attribute]
+pub fn handler(args: TokenStream, input: TokenStream) -> TokenStream {
+    let args = parse_macro_input!(args with Punctuated::<LitStr, Token![,]>::parse_terminated);
+
+    let module = &args[0].value();
+    let method = &args[1].value();
+
+    let input_fn = parse_macro_input!(input as syn::ItemFn);
+    let fn_name: syn::Ident = input_fn.sig.ident;
+    let inner_fn_name = syn::Ident::new(&format!("{}_handler", fn_name), fn_name.span());
+
+    let output = quote! {
+        pub const #fn_name: Handler = Handler {
+            module: #module,
+            method: #method,
+            handle: |model: &str, body: &str| -> Pin<Box<dyn Future<Output = String> + Send>> {
+                Box::pin(#inner_fn_name(model, body))
+            }
+        };
+
+        pub fn #inner_fn_name(model: &str, body: &str) -> impl Future<Output = String> + Send {
+            #fn_name(model, body)
+        }
+    };
+
+    output.into()
+}