Merge #3738

3738: Implement ra_proc_macro client logic r=matklad a=edwin0cheng

This PR add the actual client logic for `ra_proc_macro` crate:

1. Define all necessary rpc serialization data structure, which include `ra_tt` related data and some task messages. Although adding `Serialize` and `Deserialize` trait to ra_tt directly seem to be much easier,   we deliberately duplicate the `ra_tt` struct with `#[serde(with = "XXDef")]` for separation of  code responsibility. 
2. Define a simplified version of lsp base protocol for rpc, which basically copy from lsp-server code base. 
3. Implement the actual `IO` for the client side progress spawning and message passing.

Co-authored-by: Edwin Cheng <[email protected]>

1 files changed, 13 insertions, 1 deletions

diff --git a/crates/ra_project_model/src/cargo_workspace.rs b/crates/ra_project_model/src/cargo_workspace.rs
index 738fd6f61..0aea01d83 100644
--- a/crates/ra_project_model/src/cargo_workspace.rs
+++ b/crates/ra_project_model/src/cargo_workspace.rs
@@ -1,6 +1,7 @@
 //! FIXME: write short doc here
 
 use std::{
+    ffi::OsStr,
     ops,
     path::{Path, PathBuf},
 };
@@ -299,7 +300,10 @@ pub fn load_extern_resources(cargo_toml: &Path, cargo_features: &CargoFeatures)
             Message::CompilerArtifact(message) => {
                 if message.target.kind.contains(&"proc-macro".to_string()) {
                     let package_id = message.package_id;
-                    if let Some(filename) = message.filenames.get(0) {
+                    // Skip rmeta file
+                    if let Some(filename) =
+                        message.filenames.iter().filter(|name| is_dylib(name)).next()
+                    {
                         acc.proc_dylib_paths.insert(package_id, filename.clone());
                     }
                 }
@@ -316,3 +320,11 @@ pub fn load_extern_resources(cargo_toml: &Path, cargo_features: &CargoFeatures)
 
     acc
 }
+
+// FIXME: File a better way to know if it is a dylib
+fn is_dylib(path: &Path) -> bool {
+    match path.extension().and_then(OsStr::to_str).map(|it| it.to_string().to_lowercase()) {
+        None => false,
+        Some(ext) => matches!(ext.as_str(), "dll" | "dylib" | "so"),
+    }
+}