Allow plugins to ignore certain views (#2410)

plugin/core/sessions.py

@@ -937,6 +937,15 @@ def on_post_start(cls, window: sublime.Window, initiating_view: sublime.View,
         """
         pass
 
+    @classmethod
+    def should_ignore(cls, view: sublime.View) -> bool:
+        """
+        Exclude a view from being handled by the language server, even if it matches the URI scheme(s) and selector from
+        the configuration. This can be used to, for example, ignore certain file patterns which are listed in a
+        configuration file (e.g. .gitignore).
+        """
+        return False
+
     @classmethod
     def markdown_language_id_to_st_syntax_map(cls) -> Optional[MarkdownLangMap]:
         """
@@ -1383,6 +1392,9 @@ def compare_by_string(sb: Optional[SessionBufferProtocol]) -> bool:
     def can_handle(self, view: sublime.View, scheme: str, capability: Optional[str], inside_workspace: bool) -> bool:
         if not self.state == ClientStates.READY:
             return False
+        if self._plugin and self._plugin.should_ignore(view):
+            debug(view, "ignored by plugin", self._plugin.__class__.__name__)
+            return False
         if scheme == "file":
             file_name = view.file_name()
             if not file_name:

plugin/core/windows.py

@@ -232,7 +232,11 @@ def _needed_config(self, view: sublime.View) -> Optional[ClientConfig]:
                     handled = True
                     break
             if not handled:
-                return config
+                plugin = get_plugin(config.name)
+                if plugin and plugin.should_ignore(view):
+                    debug(view, "ignored by plugin", plugin.__name__)
+                else:
+                    return config
         return None
 
     def start_async(self, config: ClientConfig, initiating_view: sublime.View) -> None: