Implement ra_proc_macro client logic

crates/ra_proc_macro/src/lib.rs

@@ -5,55 +5,102 @@
 //! is used to provide basic infrastructure  for communication between two
 //! processes: Client (RA itself), Server (the external program)
 
+mod rpc;
+mod process;
+pub mod msg;
+
+use process::ProcMacroProcessSrv;
 use ra_tt::{SmolStr, Subtree};
+use rpc::ProcMacroKind;
 use std::{
     path::{Path, PathBuf},
     sync::Arc,
 };
 
-#[derive(Debug, Clone, PartialEq, Eq)]
+pub use rpc::{ExpansionResult, ExpansionTask};
+
+#[derive(Debug, Clone)]
 pub struct ProcMacroProcessExpander {
     process: Arc<ProcMacroProcessSrv>,
+    dylib_path: PathBuf,
     name: SmolStr,
 }
 
+impl Eq for ProcMacroProcessExpander {}
+impl PartialEq for ProcMacroProcessExpander {
+    fn eq(&self, other: &Self) -> bool {
+        self.name == other.name
+            && self.dylib_path == other.dylib_path
+            && Arc::ptr_eq(&self.process, &other.process)
+    }
+}
+
 impl ra_tt::TokenExpander for ProcMacroProcessExpander {
     fn expand(
         &self,
-        _subtree: &Subtree,
+        subtree: &Subtree,
         _attr: Option<&Subtree>,
     ) -> Result<Subtree, ra_tt::ExpansionError> {
-        // FIXME: do nothing for now
-        Ok(Subtree::default())
+        self.process.custom_derive(&self.dylib_path, subtree, &self.name)
     }
 }
 
-#[derive(Debug, Clone, PartialEq, Eq)]
-pub struct ProcMacroProcessSrv {
-    path: PathBuf,
-}
-
-#[derive(Debug, Clone, PartialEq, Eq)]
-pub enum ProcMacroClient {
+#[derive(Debug, Clone)]
+enum ProcMacroClientKind {
     Process { process: Arc<ProcMacroProcessSrv> },
     Dummy,
 }
 
+#[derive(Debug, Clone)]
+pub struct ProcMacroClient {
+    kind: ProcMacroClientKind,
+}
+
 impl ProcMacroClient {
-    pub fn extern_process(process_path: &Path) -> ProcMacroClient {
-        let process = ProcMacroProcessSrv { path: process_path.into() };
-        ProcMacroClient::Process { process: Arc::new(process) }
+    pub fn extern_process(process_path: &Path) -> Result<ProcMacroClient, std::io::Error> {
+        let process = ProcMacroProcessSrv::run(process_path)?;
+        Ok(ProcMacroClient { kind: ProcMacroClientKind::Process { process: Arc::new(process) } })
     }
 
     pub fn dummy() -> ProcMacroClient {
-        ProcMacroClient::Dummy
+        ProcMacroClient { kind: ProcMacroClientKind::Dummy }
     }
 
     pub fn by_dylib_path(
         &self,
-        _dylib_path: &Path,
+        dylib_path: &Path,
     ) -> Vec<(SmolStr, Arc<dyn ra_tt::TokenExpander>)> {
-        // FIXME: return empty for now
-        vec![]
+        match &self.kind {
+            ProcMacroClientKind::Dummy => vec![],
+            ProcMacroClientKind::Process { process } => {
+                let macros = match process.find_proc_macros(dylib_path) {
+                    Err(err) => {
+                        eprintln!("Fail to find proc macro. Error: {:#?}", err);
+                        return vec![];
+                    }
+                    Ok(macros) => macros,
+                };
+
+                macros
+                    .into_iter()
+                    .filter_map(|(name, kind)| {
+                        // FIXME: Support custom derive only for now.
+                        match kind {
+                            ProcMacroKind::CustomDerive => {
+                                let name = SmolStr::new(&name);
+                                let expander: Arc<dyn ra_tt::TokenExpander> =
+                                    Arc::new(ProcMacroProcessExpander {
+                                        process: process.clone(),
+                                        name: name.clone(),
+                                        dylib_path: dylib_path.into(),
+                                    });
+                                Some((name, expander))
+                            }
+                            _ => None,
+                        }
+                    })
+                    .collect()
+            }
+        }
     }
 }