installer: GUI no longer default enabled

ManifoldEM/interfaces/gui.py

@@ -11,9 +11,13 @@
 
 from argparse import ArgumentParser
 
-from PyQt5 import QtCore
-from PyQt5.QtGui import QFont
-from PyQt5.QtWidgets import QApplication
+try:
+    from PyQt5 import QtCore
+    from PyQt5.QtGui import QFont
+    from PyQt5.QtWidgets import QApplication
+except ImportError:
+    print("PyQt5 not found. Did you install ManifoldEM with the [gui] option? Consult the README for more information.")
+    sys.exit(1)
 
 import ManifoldEM
 

README.md

@@ -29,7 +29,8 @@ resources may prove useful for a review of ManifoldEM history, theory and implem
 
 ## Installation
 Should be installable in any modern python/conda environment (python 3.9+, though `mayavi` and
-`pyqt` packages don't always immediately work with the most recent version of python).
+`pyqt` packages don't always immediately work with the most recent version of python). If you don't
+need the gui, feel free to omit the "[gui]" part of the install command!
 
 python:
 ```bash
@@ -38,7 +39,7 @@ python3 -m venv ~/envs/manifoldem
 source ~/envs/manifoldem/bin/activate
 
 pip install --upgrade pip
-pip install "git+ssh://[email protected]/flatironinstitute/ManifoldEM"
+pip install "git+ssh://[email protected]/flatironinstitute/ManifoldEM[gui]"
 
 manifold-gui
 ```

pyproject.toml

@@ -48,8 +48,6 @@ dependencies = [
     "nptyping",
     "numpy",
     "numba",
-    "mayavi",
-    "PyQt5",
     "psutil",
     "matplotlib",
     "scikit-image",
@@ -66,6 +64,12 @@ dependencies = [
     "fasthog",
 ]
 
+[project.optional-dependencies]
+gui = [
+    "mayavi",
+    "PyQt5",
+]
+
 [project.scripts]
 manifold-cli = "ManifoldEM.interfaces.cli:main"
 manifold-gui = "ManifoldEM.interfaces.gui:main"