Run rustc/cargo in the background to avoid blocking UI

linter.py

@@ -11,9 +11,9 @@
 """This module exports the Rustc plugin class."""
 
 import os
+import threading
 from SublimeLinter.lint import Linter, util, persist
 
-
 class Rust(Linter):
 
     """Provides an interface to Rust."""
@@ -38,7 +38,32 @@ class Rust(Linter):
     cargo_config = None
     crate_root = None
 
+    thread = None
+    dirty = threading.Event()
+    args_for_thread = None
+    result_from_thread = ""
+
     def run(self, cmd, code):
+        if not self.thread:
+            self.thread = threading.Thread(target=self.wait_to_run, args = ())
+            self.thread.daemon = True
+            self.thread.start()
+        print('running', self.result_from_thread, self.thread)
+        self.args_for_thread = (cmd, code)
+        self.dirty.set()
+        return self.result_from_thread
+
+    def wait_to_run(self):
+        while True:
+            print('waiting')
+            self.dirty.wait()
+            print('firing')
+            cmd, code = self.args_for_thread
+            self.result_from_thread = self.really_run(cmd, code)
+            self.dirty.clear()
+            print('got', self.result_from_thread)
+
+    def really_run(self, cmd, code):
         """
         Return a list with the command to execute.
 
@@ -57,6 +82,10 @@ def run(self, cmd, code):
         module hierarchy will probably cause an error and prevent proper
         linting in the rest of the file.
         """
+
+        # NOTE sharing the config with this thread is not safe but I am too lazy to
+        #      strip out all the instance variables and pass them atomically
+
         self.use_cargo = self.get_view_settings().get('use-cargo', False)
         self.use_crate_root = self.get_view_settings().get(
             'use-crate-root', False)