Remove proc-macro server command from the rust-analyzer binary

crates/proc-macro-srv-cli/src/main.rs

@@ -1,5 +1,6 @@
 //! A standalone binary for `proc-macro-srv`.
 //! Driver for proc macro server
+use std::io;
 
 fn main() -> std::io::Result<()> {
     let v = std::env::var("RUST_ANALYZER_INTERNALS_DO_NOT_USE");
@@ -14,5 +15,37 @@ fn main() -> std::io::Result<()> {
         }
     }
 
-    proc_macro_srv_cli::run()
+    run()
+}
+
+#[cfg(not(feature = "sysroot-abi"))]
+fn run() -> io::Result<()> {
+    panic!("proc-macro-srv-cli requires the `sysroot-abi` feature to be enabled");
+}
+
+#[cfg(feature = "sysroot-abi")]
+fn run() -> io::Result<()> {
+    use proc_macro_api::msg::{self, Message};
+
+    let read_request = |buf: &mut String| msg::Request::read(&mut io::stdin().lock(), buf);
+
+    let write_response = |msg: msg::Response| msg.write(&mut io::stdout().lock());
+
+    let mut srv = proc_macro_srv::ProcMacroSrv::default();
+    let mut buf = String::new();
+
+    while let Some(req) = read_request(&mut buf)? {
+        let res = match req {
+            msg::Request::ListMacros { dylib_path } => {
+                msg::Response::ListMacros(srv.list_macros(&dylib_path))
+            }
+            msg::Request::ExpandMacro(task) => msg::Response::ExpandMacro(srv.expand(task)),
+            msg::Request::ApiVersionCheck {} => {
+                msg::Response::ApiVersionCheck(proc_macro_api::msg::CURRENT_API_VERSION)
+            }
+        };
+        write_response(res)?
+    }
+
+    Ok(())
 }