Move rtic macros to repo root, tune xtask

rtic-macros/src/lib.rs

@@ -0,0 +1,91 @@
+#![doc(
+    html_logo_url = "https://raw.githubusercontent.com/rtic-rs/rtic/master/book/en/src/RTIC.svg",
+    html_favicon_url = "https://raw.githubusercontent.com/rtic-rs/rtic/master/book/en/src/RTIC.svg"
+)]
+//deny_warnings_placeholder_for_ci
+
+use proc_macro::TokenStream;
+use std::{env, fs, path::Path};
+
+mod analyze;
+mod bindings;
+mod check;
+mod codegen;
+mod syntax;
+
+// Used for mocking the API in testing
+#[doc(hidden)]
+#[proc_macro_attribute]
+pub fn mock_app(args: TokenStream, input: TokenStream) -> TokenStream {
+    if let Err(e) = syntax::parse(args, input) {
+        e.to_compile_error().into()
+    } else {
+        "fn main() {}".parse().unwrap()
+    }
+}
+
+/// Attribute used to declare a RTIC application
+///
+/// For user documentation see the [RTIC book](https://rtic.rs)
+///
+/// # Panics
+///
+/// Should never panic, cargo feeds a path which is later converted to a string
+#[proc_macro_attribute]
+pub fn app(args: TokenStream, input: TokenStream) -> TokenStream {
+    let (app, analysis) = match syntax::parse(args, input) {
+        Err(e) => return e.to_compile_error().into(),
+        Ok(x) => x,
+    };
+
+    if let Err(e) = check::app(&app) {
+        return e.to_compile_error().into();
+    }
+
+    let analysis = analyze::app(analysis, &app);
+
+    let ts = codegen::app(&app, &analysis);
+
+    // Default output path: <project_dir>/target/
+    let mut out_dir = Path::new("target");
+
+    // Get output directory from Cargo environment
+    // TODO don't want to break builds if OUT_DIR is not set, is this ever the case?
+    let out_str = env::var("OUT_DIR").unwrap_or_else(|_| "".to_string());
+
+    if !out_dir.exists() {
+        // Set out_dir to OUT_DIR
+        out_dir = Path::new(&out_str);
+
+        // Default build path, annotated below:
+        // $(pwd)/target/thumbv7em-none-eabihf/debug/build/rtic-<HASH>/out/
+        // <project_dir>/<target-dir>/<TARGET>/debug/build/rtic-<HASH>/out/
+        //
+        // traverse up to first occurrence of TARGET, approximated with starts_with("thumbv")
+        // and use the parent() of this path
+        //
+        // If no "target" directory is found, <project_dir>/<out_dir_root> is used
+        for path in out_dir.ancestors() {
+            if let Some(dir) = path.components().last() {
+                let dir = dir.as_os_str().to_str().unwrap();
+
+                if dir.starts_with("thumbv") || dir.starts_with("riscv") {
+                    if let Some(out) = path.parent() {
+                        out_dir = out;
+                        break;
+                    }
+                    // If no parent, just use it
+                    out_dir = path;
+                    break;
+                }
+            }
+        }
+    }
+
+    // Try to write the expanded code to disk
+    if let Some(out_str) = out_dir.to_str() {
+        fs::write(format!("{out_str}/rtic-expansion.rs"), ts.to_string()).ok();
+    }
+
+    ts.into()
+}