feat(macro): add the hook proc macro

Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>

plugin_macros/src/hook.rs

@@ -0,0 +1,67 @@
+//! Hook proc macro implementation
+//!
+//! Author: Vincenzo Palazzo <vincenzopalazzo@member.fsf.org>
+use std::process::abort;
+
+use convert_case::{Case, Casing};
+
+use kproc_parser::kparser::{DummyTracer, KParserTracer, Result};
+use kproc_parser::kproc_macros::KTokenStream;
+use kproc_parser::proc_macro::TokenStream;
+use kproc_parser::rust::ast_nodes::MethodDeclToken;
+use kproc_parser::rust::kparser::RustParser;
+
+use crate::attr_parser::AttributeParser;
+
+struct RPCHook {
+    original_name: String,
+    struct_name: String,
+    fn_name: String,
+}
+
+struct HookMethodMacro {
+    on: String,
+}
+
+pub(crate) fn parse(attr: TokenStream, item: TokenStream) -> TokenStream {
+    let tracer = DummyTracer;
+    let parser = RustParser::with_tracer(&tracer);
+    let fn_ast = parser.parse_fn(&item);
+
+    let mut attr = KTokenStream::new(&attr);
+    let parser = AttributeParser::parse(&mut attr, &tracer);
+    if let Err(err) = parser {
+        err.emit();
+        abort();
+    }
+    let parser = parser.unwrap();
+    let hook = HookMethodMacro {
+        on: parser.get("on").unwrap().to_owned(),
+    };
+    let meta = generate_hook_call(hook, fn_ast)
+        .map_err(|err| {
+            err.emit();
+            abort();
+        })
+        .unwrap();
+    generate_hook_method(meta, &tracer)
+}
+
+fn generate_hook_call(hook: HookMethodMacro, fun_dec: MethodDeclToken) -> Result<RPCHook> {
+    let struct_name = format!("On{}", hook.on.as_str().to_case(Case::Pascal));
+    let Some((_, ty)) = fun_dec.params.first() else {
+        panic!("TODO: we need to return an error, but for now the list of params is empty");
+    };
+    let Some(ty) = ty.generics.clone().and_then(|gen| gen.first().cloned()) else {
+        panic!("TODO: we need to return an error , but or now the inner generics is None")
+    };
+    Ok(RPCHook {
+        original_name: hook.on,
+        struct_name,
+        fn_name: fun_dec.ident.to_string(),
+    })
+}
+
+fn generate_hook_method<T: KParserTracer>(method_call: RPCHook, tracer: &T) -> TokenStream {
+    "".parse().unwrap()
+}

plugin_macros/src/lib.rs

@@ -6,6 +6,7 @@
 use kproc_parser::kparser::KParserTracer;
 use kproc_parser::proc_macro::TokenStream;
 
+mod hook;
 mod notification;
 mod plugin;
 mod rpc_method;
@@ -106,3 +107,12 @@ pub fn rpc_method(attr: TokenStream, item: TokenStream) -> TokenStream {
 pub fn notification(attr: TokenStream, item: TokenStream) -> TokenStream {
     notification::parse(attr, item)
 }
+
+/// procedural macros that can be used wit the following code
+/// ```no_run
+///
+/// ```
+#[proc_macro_attribute]
+pub fn hook(attr: TokenStream, item: TokenStream) -> TokenStream {
+    hook::parse(attr, item)
+}