try using python -m for pyls

Author: bollwyvl

py_src/jupyter_lsp/specs/pyls.py

@@ -1,9 +1,9 @@
 from .config import load_config_schema
-from .utils import ShellSpec
+from .utils import PythonModuleSpec
 
 
-class PythonLanguageServer(ShellSpec):
-    key = cmd = "pyls"
+class PythonLanguageServer(PythonModuleSpec):
+    python_module = key = "pyls"
     languages = ["python"]
     spec = dict(
         display_name="pyls",

py_src/jupyter_lsp/specs/utils.py

@@ -1,5 +1,6 @@
 import os
 import shutil
+import sys
 from pathlib import Path
 from typing import List, Text
 
@@ -61,6 +62,29 @@ def __call__(self, mgr: LanguageServerManagerAPI) -> KeyedLanguageServerSpecs:
         }
 
 
+class PythonModuleSpec(SpecBase):
+    """ Helper for a python-based language server spec in the notebook server
+        environment
+    """
+
+    python_module = ""
+
+    def __call__(self, mgr: LanguageServerManagerAPI) -> KeyedLanguageServerSpecs:
+        spec = __import__("importlib").util.find_spec(self.python_module)
+
+        if not spec.origin:  # pragma: no cover
+            return {}
+
+        return {
+            self.key: {
+                "argv": [sys.executable, "-m", self.python_module, *self.args],
+                "languages": self.languages,
+                "version": SPEC_VERSION,
+                **self.spec,
+            }
+        }
+
+
 class NodeModuleSpec(SpecBase):
     """ Helper for a nodejs-based language server spec in one of several
         node_modules