macros: remove embassy_prefix attr.

This was used in the past for reexporting the macros from drogue-device,
which is no longer using it.

Also, it is a pain to support, so we don't want it.

embassy-macros/src/macros/main.rs

@@ -3,28 +3,16 @@ use proc_macro2::TokenStream;
 use quote::quote;
 
 use crate::util::ctxt::Ctxt;
-use crate::util::path::ModulePrefix;
-
-#[cfg(feature = "stm32")]
-const HAL: Option<&str> = Some("embassy_stm32");
-#[cfg(feature = "nrf")]
-const HAL: Option<&str> = Some("embassy_nrf");
-#[cfg(feature = "rp")]
-const HAL: Option<&str> = Some("embassy_rp");
-#[cfg(not(any(feature = "stm32", feature = "nrf", feature = "rp")))]
-const HAL: Option<&str> = None;
 
 #[derive(Debug, FromMeta)]
 struct Args {
-    #[darling(default)]
-    embassy_prefix: ModulePrefix,
-
     #[allow(unused)]
     #[darling(default)]
     config: Option<syn::LitStr>,
 }
 
 pub fn run(args: syn::AttributeArgs, f: syn::ItemFn) -> Result<TokenStream, TokenStream> {
+    #[allow(unused_variables)]
     let args = Args::from_list(&args).map_err(|e| e.write_errors())?;
 
     let fargs = f.sig.inputs.clone();
@@ -38,26 +26,32 @@ pub fn run(args: syn::AttributeArgs, f: syn::ItemFn) -> Result<TokenStream, Toke
         ctxt.error_spanned_by(&f.sig, "task functions must not be generic");
     }
 
-    if HAL.is_some() && fargs.len() != 2 {
+    #[cfg(feature = "stm32")]
+    let hal = Some(quote!(::embassy_stm32));
+    #[cfg(feature = "nrf")]
+    let hal = Some(quote!(::embassy_nrf));
+    #[cfg(feature = "rp")]
+    let hal = Some(quote!(::embassy_rp));
+    #[cfg(not(any(feature = "stm32", feature = "nrf", feature = "rp")))]
+    let hal: Option<TokenStream> = None;
+
+    if hal.is_some() && fargs.len() != 2 {
         ctxt.error_spanned_by(&f.sig, "main function must have 2 arguments");
     }
-    if HAL.is_none() && fargs.len() != 1 {
+    if hal.is_none() && fargs.len() != 1 {
         ctxt.error_spanned_by(&f.sig, "main function must have 1 argument");
     }
 
     ctxt.check()?;
 
-    let embassy_prefix = args.embassy_prefix;
-    let embassy_prefix_lit = embassy_prefix.literal();
-    let embassy_path = embassy_prefix.append("embassy_executor").path();
     let f_body = f.block;
 
     #[cfg(feature = "wasm")]
     let main = quote! {
         #[wasm_bindgen::prelude::wasm_bindgen(start)]
         pub fn main() -> Result<(), wasm_bindgen::JsValue> {
-            static EXECUTOR: ::embassy_util::Forever<#embassy_path::executor::Executor> = ::embassy_util::Forever::new();
-            let executor = EXECUTOR.put(#embassy_path::executor::Executor::new());
+            static EXECUTOR: ::embassy_util::Forever<::embassy_executor::executor::Executor> = ::embassy_util::Forever::new();
+            let executor = EXECUTOR.put(::embassy_executor::executor::Executor::new());
 
             executor.start(|spawner| {
                 spawner.spawn(__embassy_main(spawner)).unwrap();
@@ -70,7 +64,7 @@ pub fn run(args: syn::AttributeArgs, f: syn::ItemFn) -> Result<TokenStream, Toke
     #[cfg(all(feature = "std", not(feature = "wasm")))]
     let main = quote! {
         fn main() -> ! {
-            let mut executor = #embassy_path::executor::Executor::new();
+            let mut executor = ::embassy_executor::executor::Executor::new();
             let executor = unsafe { __make_static(&mut executor) };
 
             executor.run(|spawner| {
@@ -87,16 +81,13 @@ pub fn run(args: syn::AttributeArgs, f: syn::ItemFn) -> Result<TokenStream, Toke
             })
         });
 
-        let (hal_setup, peris_arg) = match HAL {
-            Some(hal) => {
-                let embassy_hal_path = embassy_prefix.append(hal).path();
-                (
-                    quote!(
-                        let p = #embassy_hal_path::init(#config);
-                    ),
-                    quote!(p),
-                )
-            }
+        let (hal_setup, peris_arg) = match hal {
+            Some(hal) => (
+                quote!(
+                    let p = #hal::init(#config);
+                ),
+                quote!(p),
+            ),
             None => (quote!(), quote!()),
         };
 
@@ -105,7 +96,7 @@ pub fn run(args: syn::AttributeArgs, f: syn::ItemFn) -> Result<TokenStream, Toke
             fn main() -> ! {
                 #hal_setup
 
-                let mut executor = #embassy_path::executor::Executor::new();
+                let mut executor = ::embassy_executor::executor::Executor::new();
                 let executor = unsafe { __make_static(&mut executor) };
 
                 executor.run(|spawner| {
@@ -116,7 +107,7 @@ pub fn run(args: syn::AttributeArgs, f: syn::ItemFn) -> Result<TokenStream, Toke
     };
 
     let result = quote! {
-        #[#embassy_path::task(embassy_prefix = #embassy_prefix_lit)]
+        #[::embassy_executor::task()]
         async fn __embassy_main(#fargs) {
             #f_body
         }

embassy-macros/src/macros/task.rs

@@ -3,22 +3,16 @@ use proc_macro2::TokenStream;
 use quote::{format_ident, quote};
 
 use crate::util::ctxt::Ctxt;
-use crate::util::path::ModulePrefix;
 
 #[derive(Debug, FromMeta)]
 struct Args {
     #[darling(default)]
     pool_size: Option<usize>,
-    #[darling(default)]
-    embassy_prefix: ModulePrefix,
 }
 
 pub fn run(args: syn::AttributeArgs, f: syn::ItemFn) -> Result<TokenStream, TokenStream> {
     let args = Args::from_list(&args).map_err(|e| e.write_errors())?;
 
-    let embassy_prefix = args.embassy_prefix.append("embassy_executor");
-    let embassy_path = embassy_prefix.path();
-
     let pool_size: usize = args.pool_size.unwrap_or(1);
 
     let ctxt = Ctxt::new();
@@ -70,9 +64,9 @@ pub fn run(args: syn::AttributeArgs, f: syn::ItemFn) -> Result<TokenStream, Toke
         // in the user's code.
         #task_inner
 
-        #visibility fn #task_ident(#fargs) -> #embassy_path::executor::SpawnToken<impl Sized> {
+        #visibility fn #task_ident(#fargs) -> ::embassy_executor::executor::SpawnToken<impl Sized> {
             type Fut = impl ::core::future::Future + 'static;
-            static POOL: #embassy_path::executor::raw::TaskPool<Fut, #pool_size> = #embassy_path::executor::raw::TaskPool::new();
+            static POOL: ::embassy_executor::executor::raw::TaskPool<Fut, #pool_size> = ::embassy_executor::executor::raw::TaskPool::new();
             unsafe { POOL._spawn_async_fn(move || #task_inner_ident(#(#arg_names,)*)) }
         }
     };

embassy-macros/src/util/mod.rs

@@ -1,2 +1 @@
 pub mod ctxt;
-pub mod path;

embassy-macros/src/util/path.rs

@@ -1,41 +0,0 @@
-use darling::{FromMeta, Result};
-use proc_macro2::Span;
-use syn::{LitStr, Path};
-
-#[derive(Debug)]
-pub struct ModulePrefix {
-    literal: LitStr,
-}
-
-impl ModulePrefix {
-    pub fn new(path: &str) -> Self {
-        let literal = LitStr::new(path, Span::call_site());
-        Self { literal }
-    }
-
-    pub fn append(&self, component: &str) -> ModulePrefix {
-        let mut lit = self.literal().value();
-        lit.push_str(component);
-        Self::new(lit.as_str())
-    }
-
-    pub fn path(&self) -> Path {
-        self.literal.parse().unwrap()
-    }
-
-    pub fn literal(&self) -> &LitStr {
-        &self.literal
-    }
-}
-
-impl FromMeta for ModulePrefix {
-    fn from_string(value: &str) -> Result<Self> {
-        Ok(ModulePrefix::new(value))
-    }
-}
-
-impl Default for ModulePrefix {
-    fn default() -> ModulePrefix {
-        ModulePrefix::new("::")
-    }
-}