Expand variables on initializationOptions

plugin/core/clients.py

@@ -1,5 +1,6 @@
 import sublime
 import os
+import tempfile
 from .sessions import create_session, Session
 
 # typing only
@@ -9,17 +10,19 @@
 
 
 try:
-    from typing import Any, List, Dict, Tuple, Callable, Optional, Set
-    assert Any and List and Dict and Tuple and Callable and Optional and Set
+    from typing import Any, List, Dict, Tuple, Callable, Optional, Set, TypeVar
+    assert Any and List and Dict and Tuple and Callable and Optional and Set and TypeVar
     assert Session
+
+    T = TypeVar('T')
 except ImportError:
     pass
 
 
 def get_window_env(window: sublime.Window, config: ClientConfig) -> 'Tuple[List[str], Dict[str, str]]':
 
     # Create a dictionary of Sublime Text variables
-    variables = window.extract_variables()
+    variables = get_expanding_variables(window)
 
     # Expand language server command line environment variables
     expanded_args = list(
@@ -36,6 +39,31 @@ def get_window_env(window: sublime.Window, config: ClientConfig) -> 'Tuple[List[
     return expanded_args, env
 
 
+def get_expanding_variables(window: sublime.Window) -> dict:
+    variables = window.extract_variables()
+    variables.update({
+        "home": os.path.expanduser('~'),
+        "temp_dir": tempfile.gettempdir(),
+    })
+
+    return variables
+
+
+def lsp_expand_variables(window: sublime.Window, var: 'T') -> 'T':
+    if isinstance(var, dict):
+        for key, value in var.items():
+            if isinstance(value, (dict, list, str)):
+                var[key] = lsp_expand_variables(window, value)
+    elif isinstance(var, list):
+        for idx, value in enumerate(var):
+            if isinstance(value, (dict, list, str)):
+                var[idx] = lsp_expand_variables(window, value)
+    elif isinstance(var, str):
+        var = sublime.expand_variables(var, get_expanding_variables(window))
+
+    return var
+
+
 def start_window_config(window: sublime.Window,
                         project_path: str,
                         config: ClientConfig,
@@ -44,6 +72,7 @@ def start_window_config(window: sublime.Window,
                         on_post_exit: 'Callable[[str], None]') -> 'Optional[Session]':
     args, env = get_window_env(window, config)
     config.binary_args = args
+    config.init_options = lsp_expand_variables(window, config.init_options)
     return create_session(config=config,
                           project_path=project_path,
                           env=env,