Add proc-macro cli command for rust-analyzer

crates/rust-analyzer/src/bin/args.rs

@@ -45,6 +45,7 @@ pub(crate) enum Command {
         /// this would include the parser test files.
         all: bool,
     },
+    ProcMacro,
     RunServer,
     Version,
 }
@@ -264,6 +265,7 @@ ARGS:
 
                 Command::Diagnostics { path, load_output_dirs, with_proc_macro, all }
             }
+            "proc-macro" => Command::ProcMacro,
             _ => {
                 eprintln!(
                     "\

crates/rust-analyzer/src/bin/main.rs

@@ -51,6 +51,7 @@ fn main() -> Result<()> {
             cli::diagnostics(path.as_ref(), load_output_dirs, with_proc_macro, all)?
         }
 
+        args::Command::ProcMacro => run_proc_macro_sv()?,
         args::Command::RunServer => run_server()?,
         args::Command::Version => println!("rust-analyzer {}", env!("REV")),
     }
@@ -64,6 +65,11 @@ fn setup_logging() -> Result<()> {
     Ok(())
 }
 
+fn run_proc_macro_sv() -> Result<()> {
+    ra_proc_macro_srv::cli::run();
+    Ok(())
+}
+
 fn run_server() -> Result<()> {
     log::info!("lifecycle: server started");
 

crates/rust-analyzer/src/cli/load_cargo.rs

@@ -73,7 +73,10 @@ pub(crate) fn load_cargo(
     let proc_macro_client = if !with_proc_macro {
         ProcMacroClient::dummy()
     } else {
-        ProcMacroClient::extern_process(Path::new("ra_proc_macro_srv")).unwrap()
+        let mut path = std::env::current_exe()?;
+        path.pop();
+        path.push("rust-analyzer");
+        ProcMacroClient::extern_process(&path, &["proc-macro"]).unwrap()
     };
     let host = load(&source_roots, ws, &mut vfs, receiver, extern_dirs, &proc_macro_client);
     Ok((host, source_roots))

crates/rust-analyzer/src/config.rs

@@ -20,7 +20,7 @@ pub struct Config {
     pub with_sysroot: bool,
     pub publish_diagnostics: bool,
     pub lru_capacity: Option<usize>,
-    pub proc_macro_srv: Option<String>,
+    pub proc_macro_srv: Option<(String, Vec<String>)>,
     pub files: FilesConfig,
     pub notifications: NotificationsConfig,
 
@@ -134,7 +134,11 @@ impl Config {
 
         match get::<bool>(value, "/procMacro/enabled") {
             Some(true) => {
-                set(value, "/procMacro/serverPath", &mut self.proc_macro_srv);
+                if let Ok(mut path) = std::env::current_exe() {
+                    path.pop();
+                    path.push("rust-analyzer");
+                    self.proc_macro_srv = Some((path.to_string_lossy().to_string(), vec!["proc-macro".to_string()]));
+                }
             }
             _ => self.proc_macro_srv = None,
         }

crates/rust-analyzer/src/world.rs

@@ -148,9 +148,9 @@ impl WorldState {
 
         let proc_macro_client = match &config.proc_macro_srv {
             None => ProcMacroClient::dummy(),
-            Some(srv) => {
-                let path = Path::new(&srv);
-                match ProcMacroClient::extern_process(path) {
+            Some((path, args)) => {
+                let path = std::path::Path::new(path);
+                match ProcMacroClient::extern_process(path, args) {
                     Ok(it) => it,
                     Err(err) => {
                         log::error!(