♻️ Make ipylab an optional dependency (#282)

* ♻️ Make ipylab an optional dependency

* 💚 Fix tests

nbproject/__init__.py

@@ -25,16 +25,6 @@
 """
 __version__ = "0.10.1"
 
-# init jupyter lab frontend immediately on import
-# nothing happens if this is not jupyter lab
-from .dev._jupyter_lab_commands import _init_frontend
-
-# trying to init ipylab JupyterFrontEnd can lead to errors on jupyter notebook
-try:
-    _init_frontend()
-except:  # noqa: E722
-    pass
-
 from . import dev
 from ._header import header
 from ._meta import meta

nbproject/_header.py

@@ -100,8 +100,6 @@ def header(
     # We assume Jupyter Lab as an environment for now
     if env is None:
         env = "lab"
-        # this logs "jupyter lab" in vscode and hence, is confusing
-        # logger.info("Assuming editor is Jupyter Lab.")
 
     try:
         nb = read_notebook(filepath)  # type: ignore
@@ -117,8 +115,6 @@ def header(
 
     # initialize
     if "nbproject" not in nb.metadata:
-        logger.info("Attaching notebook metadata")
-
         if env in ("lab", "notebook"):
             _save_notebook(env)
             nb = read_notebook(filepath)  # type: ignore

nbproject/dev/_jupyter_lab_commands.py

@@ -1,14 +1,14 @@
 from pathlib import Path
 from time import sleep
 
-from ipylab import JupyterFrontEnd
-
 from nbproject._is_run_from_ipython import is_run_from_ipython
 
 app = None
 
 
 def _init_frontend():
+    from ipylab import JupyterFrontEnd
+
     global app
     if app is None and is_run_from_ipython:
         app = JupyterFrontEnd()

pyproject.toml

@@ -19,7 +19,6 @@ dependencies = [
     "pyyaml",
     "packaging",
     "orjson",
-    "ipylab",
     "importlib-metadata",
     "stdlib_list; python_version < '3.10'",
     "lamin_utils>=0.5.0",
@@ -38,6 +37,7 @@ dev = [
     "nbformat",
     "nbproject_test >= 0.4.5",
     "laminci",
+    "ipylab",
 ]
 
 [project.scripts]