Use the recommended layout for proc macros

tracker/agb-tracker/Cargo.toml

@@ -6,7 +6,11 @@ license = "MPL-2.0"
 description = "Library for playing tracker music. Designed for use with the agb library for the Game Boy Advance."
 repository = "https://github.com/agbrs/agb"
 
+[features]
+default = ["xm"]
+xm = ["dep:agb_xm"]
+
 [dependencies]
-agb_xm = { version = "0.15.0", path = "../agb-xm" }
+agb_xm = { version = "0.15.0", path = "../agb-xm", optional = true }
 agb = { version = "0.15.0", path = "../../agb" }
 agb_tracker_interop = { version = "0.15.0", path = "../agb-tracker-interop", default-features = false }

tracker/agb-xm-core/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "agb_xm_core"
+version = "0.15.0"
+authors = ["Gwilym Kuiper <gw@ilym.me>"]
+edition = "2021"
+license = "MPL-2.0"
+description = "Library for converting XM tracker files for use with agb-tracker on the Game Boy Advance. You shouldn't use this package directly"
+repository = "https://github.com/agbrs/agb"
+
+[dependencies]
+proc-macro-error = "1"
+proc-macro2 = "1"
+quote = "1"
+
+agb_tracker_interop = { version = "0.15.0", path = "../agb-tracker-interop" }

tracker/agb-xm-core/src/lib.rs

@@ -0,0 +1,14 @@
+use proc_macro2::TokenStream;
+use proc_macro_error::abort;
+
+use quote::quote;
+
+pub fn agb_xm_core(args: TokenStream) -> TokenStream {
+    if args.is_empty() {
+        abort!(args, "must pass a filename");
+    }
+
+    quote! {
+        fn hello_world() {}
+    }
+}

tracker/agb-xm/Cargo.toml

@@ -4,10 +4,13 @@ version = "0.15.0"
 authors = ["Gwilym Kuiper <gw@ilym.me>"]
 edition = "2021"
 license = "MPL-2.0"
-description = "Library for converting XM tracker files for use with agb-tracker on the Game Boy Advance"
+description = "Library for converting XM tracker files for use with agb-tracker on the Game Boy Advance. You shouldn't use this package directly"
 repository = "https://github.com/agbrs/agb"
 
 [lib]
 proc-macro = true
 
 [dependencies]
+agb_xm_core = { version = "0.15.0", path = "../agb-xm-core" }
+proc-macro-error = "1"
+proc-macro2 = "1"

tracker/agb-xm/src/lib.rs

@@ -1,14 +1,8 @@
-fn add(left: usize, right: usize) -> usize {
+use proc_macro::TokenStream;
-    left + right
+use proc_macro_error::proc_macro_error;
-}
 
-#[cfg(test)]
+#[proc_macro_error]
-mod tests {
+#[proc_macro]
-    use super::*;
+pub fn import_xm(args: TokenStream) -> TokenStream {
-
+    agb_xm_core::agb_xm_core(args.into()).into()
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
-    }
 }