feat: Completely revamped dependency system.

.gitignore

@@ -1,4 +1,5 @@
 dev
+build
 *.blend[0-9]
 
 .cached-dependencies

.python-version

@@ -1 +1 @@
-3.10.13
+3.11.8

pyproject.toml

@@ -6,16 +6,25 @@ authors = [
     { name = "Sofus Albert Høgsbro Rose", email = "blender-maxwell@sofusrose.com" }
 ]
 dependencies = [
-    "tidy3d>=2.6.1",
+	"tidy3d~=2.6.1",
-    "pydantic>=2.6.4",
+	"pydantic~=2.6.4",
-    "sympy>=1.12",
+	"sympy~=1.12",
-    "scipy>=1.12.0",
+	"scipy~=1.12.0",
-    "trimesh>=4.2.0",
+	"trimesh~=4.2.0",
-    "networkx>=3.2.1",
+	"networkx~=3.2.1",
-    "rtree>=1.2.0",
+	"rtree~=1.2.0",
+
+	# Pin Blender 4.1.0-Compatible Versions
+	## The dependency resolver will report if anything is wonky.
+	"urllib3==1.26.8",
+	"requests==2.27.1",
+	"numpy==1.24.3",
+	"idna==3.3",
+	"charset-normalizer==2.0.10",
+	"certifi==2021.10.8",
 ]
 readme = "README.md"
-requires-python = "~= 3.10"
+requires-python = "~= 3.11"
 license = { text = "AGPL-3.0-or-later" }
 
 ####################
@@ -26,13 +35,18 @@ managed = true
 virtual = true
 dev-dependencies = [
     "ruff>=0.3.2",
+    "fake-bpy-module-4-0>=20231118",  ## TODO: Update to Blender 4.1.0
 ]
 
+[tool.rye.scripts]
+dev = "python ./scripts/run.py"
+
+
 ####################
 # - Tooling: Ruff
 ####################
 [tool.ruff]
-target-version = "py312"
+target-version = "py311"
 line-length = 79
 
 [tool.ruff.lint]
@@ -77,14 +91,15 @@ select = [
 	"PT", # flake8-pytest-style  ## pytest-Specific Checks
 ]
 ignore = [
-	"B008", # FastAPI uses this for Depends(), Security(), etc. .
-	"E701", # class foo(Parent): pass or if simple: return are perfectly elegant
 	"COM812",  # Conflicts w/Formatter
 	"ISC001",  # Conflicts w/Formatter
 	"Q000",  # Conflicts w/Formatter
 	"Q001",  # Conflicts w/Formatter
 	"Q002",  # Conflicts w/Formatter
 	"Q003",  # Conflicts w/Formatter
+	"B008", # FastAPI uses this for Depends(), Security(), etc. .
+	"E701", # class foo(Parent): pass or if simple: return are perfectly elegant
+	"ERA001", # 'Commented-out code' seems to be just about anything to ruff
 ]
 
 ####################

requirements-dev.lock

@@ -14,9 +14,9 @@ boto3==1.23.1
 botocore==1.26.10
     # via boto3
     # via s3transfer
-certifi==2024.2.2
+certifi==2021.10.8
     # via requests
-charset-normalizer==3.3.2
+charset-normalizer==2.0.10
     # via requests
 click==8.0.3
     # via dask
@@ -31,6 +31,7 @@ cycler==0.12.1
     # via matplotlib
 dask==2023.10.1
     # via tidy3d
+fake-bpy-module-4-0==20231118
 fonttools==4.49.0
     # via matplotlib
 fsspec==2024.2.0
@@ -40,7 +41,7 @@ h5netcdf==1.0.2
 h5py==3.10.0
     # via h5netcdf
     # via tidy3d
-idna==3.6
+idna==3.3
     # via requests
 importlib-metadata==6.11.0
     # via dask
@@ -57,11 +58,10 @@ matplotlib==3.8.3
 mpmath==1.3.0
     # via sympy
 networkx==3.2.1
-numpy==1.26.4
+numpy==1.24.3
     # via contourpy
     # via h5py
     # via matplotlib
-    # via pandas
     # via scipy
     # via shapely
     # via trimesh
@@ -99,10 +99,10 @@ pyyaml==6.0.1
     # via dask
     # via responses
     # via tidy3d
-requests==2.31.0
+requests==2.27.1
     # via responses
     # via tidy3d
-responses==0.25.0
+responses==0.23.1
     # via tidy3d
 rich==12.5.1
     # via tidy3d
@@ -124,12 +124,14 @@ toolz==0.12.1
     # via dask
     # via partd
 trimesh==4.2.0
+types-pyyaml==6.0.12.20240311
+    # via responses
 typing-extensions==4.10.0
     # via pydantic
     # via pydantic-core
 tzdata==2024.1
     # via pandas
-urllib3==1.26.18
+urllib3==1.26.8
     # via botocore
     # via requests
     # via responses

requirements.lock

@@ -14,9 +14,9 @@ boto3==1.23.1
 botocore==1.26.10
     # via boto3
     # via s3transfer
-certifi==2024.2.2
+certifi==2021.10.8
     # via requests
-charset-normalizer==3.3.2
+charset-normalizer==2.0.10
     # via requests
 click==8.0.3
     # via dask
@@ -40,7 +40,7 @@ h5netcdf==1.0.2
 h5py==3.10.0
     # via h5netcdf
     # via tidy3d
-idna==3.6
+idna==3.3
     # via requests
 importlib-metadata==6.11.0
     # via dask
@@ -57,11 +57,10 @@ matplotlib==3.8.3
 mpmath==1.3.0
     # via sympy
 networkx==3.2.1
-numpy==1.26.4
+numpy==1.24.3
     # via contourpy
     # via h5py
     # via matplotlib
-    # via pandas
     # via scipy
     # via shapely
     # via trimesh
@@ -99,10 +98,10 @@ pyyaml==6.0.1
     # via dask
     # via responses
     # via tidy3d
-requests==2.31.0
+requests==2.27.1
     # via responses
     # via tidy3d
-responses==0.25.0
+responses==0.23.1
     # via tidy3d
 rich==12.5.1
     # via tidy3d
@@ -123,12 +122,14 @@ toolz==0.12.1
     # via dask
     # via partd
 trimesh==4.2.0
+types-pyyaml==6.0.12.20240311
+    # via responses
 typing-extensions==4.10.0
     # via pydantic
     # via pydantic-core
 tzdata==2024.1
     # via pandas
-urllib3==1.26.18
+urllib3==1.26.8
     # via botocore
     # via requests
     # via responses

run.py

@@ -1,108 +0,0 @@
-import zipfile
-import contextlib
-import shutil
-import sys
-from pathlib import Path
-
-import bpy
-import addon_utils
-
-PATH_ROOT = Path(__file__).resolve().parent
-
-####################
-# - Defined Constants
-####################
-ADDON_NAME = "blender_maxwell"
-PATH_BLEND = PATH_ROOT / "demo.blend"
-PATH_ADDON_DEPS = PATH_ROOT / ".cached-dependencies"
-
-####################
-# - Computed Constants
-####################
-PATH_ADDON = PATH_ROOT / ADDON_NAME
-PATH_ADDON_ZIP = PATH_ROOT / (ADDON_NAME + ".zip")
-
-####################
-# - Utilities
-####################
-@contextlib.contextmanager
-def zipped_directory(path_dir: Path, path_zip: Path):
-	"""Context manager that exposes a zipped version of a directory,
-	then deletes the .zip file afterwards.
-	"""
-	# Delete Existing ZIP file (if exists)
-	if path_zip.is_file(): path_zip.unlink()
-	
-	# Create a (new) ZIP file of the addon directory
-	with zipfile.ZipFile(path_zip, 'w', zipfile.ZIP_DEFLATED) as f_zip:
-		for file_to_zip in path_dir.rglob('*'):
-			f_zip.write(file_to_zip, file_to_zip.relative_to(path_dir.parent))
-	
-	# Delete the ZIP
-	try:
-		yield path_zip
-	finally:
-		path_zip.unlink()
-
-####################
-# - main()
-####################
-if __name__ == "__main__":
-	# Check and uninstall the addon if it's enabled
-	is_loaded_by_default, is_loaded_now = addon_utils.check(ADDON_NAME)
-	if is_loaded_now:
-		# Disable the Addon
-		addon_utils.disable(ADDON_NAME, default_set=True, handle_error=None)
-
-		# Completey Delete the Addon
-		for mod in addon_utils.modules():
-			if mod.__name__ == ADDON_NAME:
-				# Delete Addon from Blender Python Tree
-				shutil.rmtree(Path(mod.__file__).parent)
-				
-				# Reset All Addons
-				addon_utils.reset_all()
-				
-				# Save User Preferences & Break
-				bpy.ops.wm.save_userpref()
-				break
-		
-		# Quit Blender (hard-flush Python environment)
-		## - Python environments are not made to be partially flushed.
-		## - This is the only truly reliable way to avoid all bugs.
-		## - See https://github.com/JacquesLucke/blender_vscode
-		bpy.ops.wm.quit_blender()
-		try:
-			raise RuntimeError
-		except:
-			sys.exit(42)
-
-	with zipped_directory(PATH_ADDON, PATH_ADDON_ZIP) as path_zipped:
-		# Install the ZIPped Addon
-		bpy.ops.preferences.addon_install(filepath=str(path_zipped))
-	
-	# Enable the Addon
-	addon_utils.enable(
-		ADDON_NAME,
-		default_set=True,
-		persistent=True,
-		handle_error=None,
-	)
-	
-	# Save User Preferences
-	bpy.ops.wm.save_userpref()
-
-	# Load the .blend
-	bpy.ops.wm.open_mainfile(filepath=str(PATH_BLEND))
-	
-	# Ensure Addon-Specific Dependency Cache is Importable
-	## - In distribution, the addon keeps this folder in the Blender script tree.
-	## - For testing, we need to hack sys.path here.
-	## - This avoids having to install all deps with every reload.
-	if str(PATH_ADDON_DEPS) not in sys.path:
-		sys.path.insert(0, str(PATH_ADDON_DEPS))
-
-	# Modify any specific settings, if needed
-	# Example: bpy.context.preferences.addons[addon_name].preferences.your_setting = "your_value"
-
-

run.sh

@@ -1,11 +0,0 @@
-#!/bin/bash
-
-blender --python run.py
-if [ $? -eq 42 ]; then
-	echo
-	echo
-	echo
-	echo
-	echo
-	blender --python run.py
-fi

scripts/bl_run.py

@@ -0,0 +1,155 @@
+"""Blender startup script ensuring correct addon installation.
+
+See <https://github.com/dfelinto/blender/blob/master/release/scripts/modules/addon_utils.py>
+"""
+
+import shutil
+import sys
+import traceback
+from pathlib import Path
+
+import bpy
+
+sys.path.insert(0, str(Path(__file__).resolve().parent))
+import info
+import pack
+
+## TODO: Preferences item that allows using BLMaxwell 'starter.blend' as Blender's default starter blendfile.
+
+
+####################
+# - Addon Functions
+####################
+def delete_addon_if_loaded(addon_name: str) -> None:
+	"""Strongly inspired by Blender's addon_utils.py."""
+	should_restart_blender = False
+
+	# Check if Python Module is Loaded
+	mod = sys.modules.get(addon_name)
+	# if (mod := sys.modules.get(addon_name)) is None:
+	# ## It could still be loaded-by-default; then, it's in the prefs list
+	# is_loaded_now = False
+	# loads_by_default = addon_name in bpy.context.preferences.addons
+	# else:
+	# ## BL sets __addon_enabled__ on module of enabled addons.
+	# ## BL sets __addon_persistent__ on module of load-by-default addons.
+	# is_loaded_now = getattr(mod, '__addon_enabled__', False)
+	# loads_by_default = getattr(mod, '__addon_persistent__', False)
+
+	# Unregister Modules and Mark Disabled & Non-Persistent
+	## This effectively disables it
+	if mod is not None:
+		mod.__addon_enabled__ = False
+		mod.__addon_persistent__ = False
+		try:
+			mod.unregister()
+		except BaseException:
+			traceback.print_exc()
+			should_restart_blender = True
+
+	# Remove Addon
+	## Remove Addon from Preferences
+	## - Unsure why addon_utils has a while, but let's trust the process...
+	while addon_name in bpy.context.preferences.addons:
+		addon = bpy.context.preferences.addons.get(addon_name)
+		if addon:
+			bpy.context.preferences.addons.remove(addon)
+
+	## Physically Excise Addon Code
+	for addons_path in bpy.utils.script_paths(subdir='addons'):
+		addon_path = Path(addons_path) / addon_name
+		if addon_path.exists():
+			shutil.rmtree(addon_path)
+			should_restart_blender = True
+
+	## Save User Preferences
+	bpy.ops.wm.save_userpref()
+
+	# Quit (Restart) Blender - hard-flush Python environment
+	## - Python environments are not made to be partially flushed.
+	## - This is the only truly reliable way to avoid all bugs.
+	## - See <https://github.com/JacquesLucke/blender_vscode>
+	## - By passing STATUS_UNINSTALLED_ADDON, we report that it's clean now.
+	if should_restart_blender:
+		bpy.ops.wm.quit_blender()
+		sys.exit(info.STATUS_UNINSTALLED_ADDON)
+
+
+def install_addon(addon_name: str, addon_zip: Path) -> None:
+	"""Strongly inspired by Blender's addon_utils.py."""
+	# Check if Addon is Installable
+	if any(
+		[
+			(mod := sys.modules.get(addon_name)) is not None,
+			addon_name in bpy.context.preferences.addons,
+			any(
+				(Path(addon_path) / addon_name).exists()
+				for addon_path in bpy.utils.script_paths(subdir='addons')
+			),
+		]
+	):
+		## TODO: Check if addon file path exists?
+		in_pref_addons = addon_name in bpy.context.preferences.addons
+		existing_files_found = {
+			addon_path: (Path(addon_path) / addon_name).exists()
+			for addon_path in bpy.utils.script_paths(subdir='addons')
+			if (Path(addon_path) / addon_name).exists()
+		}
+		msg = f"Addon (module = '{mod}') is not installable (in preferences.addons: {in_pref_addons}) (existing files found: {existing_files_found})"
+		raise ValueError(msg)
+
+	# Install Addon
+	bpy.ops.preferences.addon_install(filepath=str(addon_zip))
+	if not any(
+		(Path(addon_path) / addon_name).exists()
+		for addon_path in bpy.utils.script_paths(subdir='addons')
+	):
+		msg = f"Couldn't install addon {addon_name}"
+		raise RuntimeError(msg)
+
+	# Enable Addon
+	bpy.ops.preferences.addon_enable(module=addon_name)
+	if addon_name not in bpy.context.preferences.addons:
+		msg = f"Couldn't enable addon {addon_name}"
+		raise RuntimeError(msg)
+
+	# Set Dev Path for Addon Dependencies
+	addon_prefs = bpy.context.preferences.addons[addon_name].preferences
+	addon_prefs.use_default_path_addon_pydeps = False
+	addon_prefs.path_addon_pydeps = info.PATH_ADDON_DEV_DEPS
+
+	# Save User Preferences
+	bpy.ops.wm.save_userpref()
+
+
+####################
+# - Entrypoint
+####################
+if __name__ == '__main__':
+	# Delete Addon (maybe; possibly restart)
+	delete_addon_if_loaded(info.ADDON_NAME)
+
+	# Signal that Live-Printing can Start
+	print(info.SIGNAL_START_CLEAN_BLENDER)  # noqa: T201
+
+	# Install and Enable Addon
+	install_failed = False
+	with pack.zipped_addon(
+		info.PATH_ADDON_PKG,
+		info.PATH_ADDON_ZIP,
+		info.PATH_ROOT / 'pyproject.toml',
+		info.PATH_ROOT / 'requirements.lock',
+	) as path_zipped:
+		try:
+			install_addon(info.ADDON_NAME, path_zipped)
+		except Exception as exe:
+			traceback.print_exc()
+			install_failed = True
+
+	# Load Development .blend
+	## TODO: We need a better (also final-deployed-compatible) solution for what happens when a user opened a .blend file without installing dependencies!
+	if not install_failed:
+		bpy.ops.wm.open_mainfile(filepath=str(info.PATH_ADDON_DEV_BLEND))
+	else:
+		bpy.ops.wm.quit_blender()
+		sys.exit(info.STATUS_NOINSTALL_ADDON)

scripts/info.py

@@ -0,0 +1,52 @@
+import tomllib
+from pathlib import Path
+
+PATH_ROOT = Path(__file__).resolve().parent.parent
+PATH_RUN = PATH_ROOT / 'scripts' / 'run.py'
+PATH_BL_RUN = PATH_ROOT / 'scripts' / 'bl_run.py'
+
+PATH_BUILD = PATH_ROOT / 'build'
+PATH_BUILD.mkdir(exist_ok=True)
+
+PATH_DEV = PATH_ROOT / 'dev'
+PATH_DEV.mkdir(exist_ok=True)
+
+####################
+# - BL_RUN stdout Signals
+####################
+SIGNAL_START_CLEAN_BLENDER = 'SIGNAL__blender_is_clean'
+
+####################
+# - BL_RUN Exit Codes
+####################
+STATUS_UNINSTALLED_ADDON = 42
+STATUS_NOINSTALL_ADDON = 68
+
+####################
+# - Addon Information
+####################
+with (PATH_ROOT / 'pyproject.toml').open('rb') as f:
+	PROJ_SPEC = tomllib.load(f)
+
+ADDON_NAME = PROJ_SPEC['project']['name']
+ADDON_VERSION = PROJ_SPEC['project']['version']
+
+####################
+# - Packaging Information
+####################
+PATH_ADDON_PKG = PATH_ROOT / 'src' / ADDON_NAME
+PATH_ADDON_ZIP = (
+	PATH_ROOT / 'build' / (ADDON_NAME + '__' + ADDON_VERSION + '.zip')
+)
+
+PATH_ADDON_BLEND_STARTER = PATH_ADDON_PKG / 'blenders' / 'starter.blend'
+
+		# Install the ZIPped Addon
+####################
+# - Development Information
+####################
+PATH_ADDON_DEV_BLEND = PATH_DEV / 'demo.blend'
+
+PATH_ADDON_DEV_DEPS = PATH_DEV / '.cached-dev-dependencies'
+PATH_ADDON_DEV_DEPS.mkdir(exist_ok=True)
+

scripts/pack.py

@@ -0,0 +1,93 @@
+import contextlib
+import tempfile
+import typing as typ
+import zipfile
+from pathlib import Path
+
+import info
+
+_PROJ_VERSION_STR = str(
+	tuple(int(el) for el in info.PROJ_SPEC['project']['version'].split('.'))
+)
+_PROJ_DESC_STR = info.PROJ_SPEC['project']['description']
+
+BL_INFO_REPLACEMENTS = {
+	"'version': (0, 0, 0),": f"'version': {_PROJ_VERSION_STR},",
+	"'description': 'Placeholder',": f"'description': '{_PROJ_DESC_STR}',",
+}
+
+
+@contextlib.contextmanager
+def zipped_addon(
+	path_addon_pkg: Path,
+	path_addon_zip: Path,
+	path_pyproject_toml: Path,
+	path_requirements_lock: Path,
+	replace_if_exists: bool = False,
+) -> typ.Iterator[Path]:
+	"""Context manager exposing a folder as a (temporary) zip file.
+	The .zip file is deleted afterwards.
+	"""
+	# Delete Existing ZIP (maybe)
+	if path_addon_zip.is_file():
+		if replace_if_exists:
+			msg = 'File already exists where ZIP would be made'
+			raise ValueError(msg)
+		path_addon_zip.unlink()
+
+	# Create New ZIP file of the addon directory
+	with zipfile.ZipFile(path_addon_zip, 'w', zipfile.ZIP_DEFLATED) as f_zip:
+		# Install Addon Files @ /*
+		for file_to_zip in path_addon_pkg.rglob('*'):
+			# Dynamically Alter 'bl_info' in __init__.py
+			## This is the only way to propagate ex. version information
+			if str(file_to_zip.relative_to(path_addon_pkg)) == '__init__.py':
+				with (
+					file_to_zip.open('r') as f_init,
+					tempfile.NamedTemporaryFile(mode='w') as f_tmp,
+				):
+					initpy = f_init.read()
+					for to_replace, replacement in BL_INFO_REPLACEMENTS.items():
+						initpy = initpy.replace(to_replace, replacement)
+					f_tmp.write(initpy)
+
+					# Write to ZIP
+					f_zip.writestr(
+						str(file_to_zip.relative_to(path_addon_pkg.parent)),
+						initpy,
+					)
+
+			# Write File to Zip
+			else:
+				f_zip.write(
+					file_to_zip, file_to_zip.relative_to(path_addon_pkg.parent)
+				)
+
+		# Install pyproject.toml @ /pyproject.toml of Addon
+		f_zip.write(
+			path_pyproject_toml,
+			str(
+				(
+					Path(path_addon_pkg.name)
+					/ Path(path_pyproject_toml.name)
+				)
+				.with_suffix('')
+				.with_suffix('.toml')
+			),
+		)
+
+		# Install requirements.lock @ /requirements.txt of Addon
+		f_zip.write(
+			path_requirements_lock,
+			str(
+				(Path(path_addon_pkg.name) / Path(path_requirements_lock.name))
+				.with_suffix('')
+				.with_suffix('.txt')
+			),
+		)
+
+	# Delete the ZIP
+	try:
+		yield path_addon_zip
+	finally:
+		path_addon_zip.unlink()

scripts/run.py

@@ -0,0 +1,54 @@
+import os
+import subprocess
+from pathlib import Path
+
+import info
+
+
+####################
+# - Blender Runner
+####################
+def run_blender(py_script: Path, print_live: bool = False):
+	process = subprocess.Popen(
+		['blender', '--python', str(py_script)],
+		env = os.environ | {'PYTHONUNBUFFERED': '1'},
+		stdout=subprocess.PIPE,
+		stderr=subprocess.STDOUT,
+		text=True,
+	)
+	output = []
+	printing_live = print_live
+
+	# Process Real-Time Output
+	for line in iter(process.stdout.readline, b''):
+		if not line:
+			break
+
+		if printing_live:
+			print(line, end='')  # noqa: T201
+		elif (
+			info.SIGNAL_START_CLEAN_BLENDER in line
+			#or 'Traceback (most recent call last)' in line
+		):
+			printing_live = True
+			print(''.join(output))  # noqa: T201
+		else:
+			output.append(line)
+
+	# Wait for the process to finish and get the exit code
+	process.wait()
+	return process.returncode, output
+
+
+####################
+# - Run Blender w/Clean Addon Reinstall
+####################
+if __name__ == '__main__':
+	return_code, output = run_blender(info.PATH_BL_RUN, print_live=False)
+	if return_code == info.STATUS_UNINSTALLED_ADDON:
+		return_code, output = run_blender(info.PATH_BL_RUN, print_live=True)
+		if return_code == info.STATUS_NOINSTALL_ADDON:
+			msg = f"Couldn't install addon {info.ADDON_NAME}"
+			raise ValueError(msg)
+	elif return_code != 0:
+		print(''.join(output))  # noqa: T201

src/blender_maxwell/__init__.py

@@ -1,84 +1,97 @@
+import tomllib
+from pathlib import Path
+
+import bpy
+
+from . import operators_nodeps, preferences, registration
+from .utils import pydeps
+from .utils import logger as _logger
+
+log = _logger.get()
+PATH_ADDON_ROOT = Path(__file__).resolve().parent
+with (PATH_ADDON_ROOT / 'pyproject.toml').open('rb') as f:
+	PROJ_SPEC = tomllib.load(f)
+
+####################
+# - Addon Information
+####################
+# The following parameters are replaced when packing the addon ZIP
+## - description
+## - version
 bl_info = {
-	"name": "Maxwell Simulation and Visualization",
+	'name': 'Maxwell PDE Sim and Viz',
-	"blender": (4, 0, 2),
+	'blender': (4, 1, 0),
-	"category": "Node",
+	'category': 'Node',
-	"description": "Custom node trees for defining and visualizing Maxwell simulation.",
+	'description': 'Placeholder',
-	"author": "Sofus Albert Høgsbro Rose",
+	'author': 'Sofus Albert Høgsbro Rose',
-	"version": (0, 1),
+	'version': (0, 0, 0),
-	"wiki_url": "https://git.sofus.io/dtu-courses/bsc_thesis",
+	'wiki_url': 'https://git.sofus.io/dtu-courses/bsc_thesis',
-	"tracker_url": "https://git.sofus.io/dtu-courses/bsc_thesis/issues",
+	'tracker_url': 'https://git.sofus.io/dtu-courses/bsc_thesis/issues',
 }
+## bl_info MUST readable via. ast.parse
+## See scripts/pack.py::BL_INFO_REPLACEMENTS for active replacements
+## The mechanism is a 'dumb' - output of 'ruff fmt' MUST be basis for replacing
+
+
+def ADDON_PREFS():
+	return bpy.context.preferences.addons[
+		PROJ_SPEC['project']['name']
+	].preferences
+
 
 ####################
-# - sys.path Library Inclusion
+# - Load and Register Addon
 ####################
-import sys
+BL_REGISTER__BEFORE_DEPS = [
-sys.path.insert(0, "/home/sofus/src/college/bsc_ge/thesis/code/.cached-dependencies")
+	*operators_nodeps.BL_REGISTER,
-## ^^ Placeholder
+	*preferences.BL_REGISTER,
+]
 
-####################
+
-# - Module Import
+def BL_REGISTER__AFTER_DEPS(path_deps: Path):
-####################
+	with pydeps.importable_addon_deps(path_deps):
-if "bpy" not in locals():
+		from . import node_trees, operators
-	import bpy
+	return [
-	import nodeitems_utils
+		*operators.BL_REGISTER,
-	try:
+		*node_trees.BL_REGISTER,
-		from . import node_trees
+	]
+
+
+def BL_KEYMAP_ITEM_DEFS(path_deps: Path):
+	with pydeps.importable_addon_deps(path_deps):
 		from . import operators
-		from . import preferences
+	return [
-	except ImportError:
+		*operators.BL_KMI_REGISTER,
-		import sys
+	]
-		sys.path.insert(0, "/home/sofus/src/college/bsc_ge/thesis/code/blender-maxwell")
-		import node_trees
-		import operators
-		import preferences
-else:
-	import importlib
-	
-	importlib.reload(node_trees)
 
 
 ####################
 # - Registration
 ####################
-BL_REGISTER = [
-	*node_trees.BL_REGISTER,
-	*operators.BL_REGISTER,
-	*preferences.BL_REGISTER,
-]
-BL_KMI_REGISTER = [
-	*operators.BL_KMI_REGISTER,
-]
-BL_NODE_CATEGORIES = [
-	*node_trees.BL_NODE_CATEGORIES,
-]
-
-km = bpy.context.window_manager.keyconfigs.addon.keymaps.new(
-	name='Node Editor',
-	space_type="NODE_EDITOR",
-)
-REGISTERED_KEYMAPS = []
 def register():
-	global REGISTERED_KEYMAPS
+	# Register Barebones Addon for Dependency Installation
+	registration.register_classes(BL_REGISTER__BEFORE_DEPS)
 
-	for cls in BL_REGISTER:
+	# Retrieve PyDeps Path from Addon Preferences
-		bpy.utils.register_class(cls)
+	addon_prefs = ADDON_PREFS()
+	path_pydeps = addon_prefs.path_addon_pydeps
 
-	for kmi_def in BL_KMI_REGISTER:
+	# If Dependencies are Satisfied, Register Everything
-		kmi = km.keymap_items.new(
+	if pydeps.check_pydeps(path_pydeps):
-			*kmi_def["_"],
+		registration.register_classes(BL_REGISTER__AFTER_DEPS())
-			ctrl=kmi_def["ctrl"],
+		registration.register_keymap_items(BL_KEYMAP_ITEM_DEFS())
-			shift=kmi_def["shift"],
+	else:
-			alt=kmi_def["alt"],
+		# Delay Registration
+		registration.delay_registration(
+			registration.EVENT__DEPS_SATISFIED,
+			classes_cb=BL_REGISTER__AFTER_DEPS,
+			keymap_item_defs_cb=BL_KEYMAP_ITEM_DEFS,
 		)
-		REGISTERED_KEYMAPS.append(kmi)
+
+		# TODO: A popup before the addon fully loads or something like that?
+		## TODO: Communicate that deps must be installed and all that?
+
 
 def unregister():
-	for cls in reversed(BL_REGISTER):
+	registration.unregister_classes()
-		bpy.utils.unregister_class(cls)
+	registration.unregister_keymap_items()
-	
-	for kmi in REGISTERED_KEYMAPS:
-		km.keymap_items.remove(kmi)
-
-if __name__ == "__main__":
-	register()

src/blender_maxwell/node_trees/maxwell_sim_nodes/contracts/schemas/managed_obj.py

@@ -1,13 +1,9 @@
 import typing as typ
-import typing as typx
 
-import pydantic as pyd
+from ..bl import ManagedObjName
-
-import bpy
-
-from ..bl import ManagedObjName, SocketName
 from ..managed_obj_type import ManagedObjType
 
+
 class ManagedObj(typ.Protocol):
 	managed_obj_type: ManagedObjType
 	
@@ -30,4 +26,3 @@ class ManagedObj(typ.Protocol):
 
 		Else, do nothing.
 		"""
-		pass

src/blender_maxwell/node_trees/maxwell_sim_nodes/contracts/schemas/socket_def.py

@@ -4,9 +4,9 @@ import bpy
 
 from ..socket_types import SocketType
 
+
 @typ.runtime_checkable
 class SocketDef(typ.Protocol):
 	socket_type: SocketType
 
-	def init(self, bl_socket: bpy.types.NodeSocket) -> None:
+	def init(self, bl_socket: bpy.types.NodeSocket) -> None: ...
-		...

src/blender_maxwell/node_trees/maxwell_sim_nodes/node_tree.py

@@ -9,10 +9,12 @@ from . import contracts as ct
 ####################
 MemAddr = int
 
+
 class DeltaNodeLinkCache(typ.TypedDict):
 	added: set[MemAddr]
 	removed: set[MemAddr]
 
+
 class NodeLinkCache:
 	def __init__(self, node_tree: bpy.types.NodeTree):
 		# Initialize Parameters
@@ -51,14 +53,15 @@ class NodeLinkCache:
 			self.link_ptrs_from_sockets[link_ptr] = link.from_socket
 			self.link_ptrs_to_sockets[link_ptr] = link.to_socket
 
-		return {"added": added_link_ptrs, "removed": removed_link_ptrs}
+		return {'added': added_link_ptrs, 'removed': removed_link_ptrs}
+
 
 ####################
 # - Node Tree Definition
 ####################
 class MaxwellSimTree(bpy.types.NodeTree):
 	bl_idname = ct.TreeType.MaxwellSim.value
-	bl_label = "Maxwell Sim Editor"
+	bl_label = 'Maxwell Sim Editor'
 	bl_icon = ct.Icon.SimNodeEditor.value
 
 	####################
@@ -79,9 +82,11 @@ class MaxwellSimTree(bpy.types.NodeTree):
 		It's a bit of a "fake" function - in practicality, it's triggered on the first update() function.
 		"""
 		## TODO: Consider tying this to an "on_load" handler
+		if hasattr(self, '_node_link_cache'):
+			self._node_link_cache.regenerate()
+		else:
 			self._node_link_cache = NodeLinkCache(self)
 
-	
 	####################
 	# - Update Methods
 	####################
@@ -92,10 +97,9 @@ class MaxwellSimTree(bpy.types.NodeTree):
 		"""
 		for bl_socket in node.inputs.values():
 			# Retrieve Socket Links (if any)
-			self._node_link_cache.remove({
+			self._node_link_cache.remove(
-				link.as_pointer()
+				{link.as_pointer() for link in bl_socket.links}
-				for link in bl_socket.links
+			)
-			})
 		## ONLY Input Socket Links are Removed from the NodeLink Cache
 		## - update() handles link-removal from still-existing node just fine.
 		## - update() does NOT handle link-removal of non-existant nodes.
@@ -105,23 +109,25 @@ class MaxwellSimTree(bpy.types.NodeTree):
 
 		Updates an internal node link cache, then updates sockets that just lost/gained an input link.
 		"""
-		if not hasattr(self, "_node_link_cache"):
+		if not hasattr(self, '_node_link_cache'):
 			self.on_load()
 			## We presume update() is run before the first link is altered.
 			## - Else, the first link of the session will not update caches.
 			## - We remain slightly unsure of the semantics.
-			## - More testing needed to prevent this 'first-link bug'.
+			## - Therefore, self.on_load() is also called as a load_post handler.
 			return
 
 		# Compute Changes to NodeLink Cache
 		delta_links = self._node_link_cache.regenerate()
 
 		link_alterations = {
-			"to_remove": [],
+			'to_remove': [],
-			"to_add": [],
+			'to_add': [],
 		}
-		for link_ptr in delta_links["removed"]:
+		for link_ptr in delta_links['removed']:
-			from_socket = self._node_link_cache.link_ptrs_from_sockets[link_ptr]
+			from_socket = self._node_link_cache.link_ptrs_from_sockets[
+				link_ptr
+			]
 			to_socket = self._node_link_cache.link_ptrs_to_sockets[link_ptr]
 
 			# Update Socket Caches
@@ -134,51 +140,49 @@ class MaxwellSimTree(bpy.types.NodeTree):
 				consent_removal := to_socket.sync_link_removed(from_socket)
 			):
 				# Did Not Consent to Removal: Queue Add Link
-				link_alterations["to_add"].append((from_socket, to_socket))
+				link_alterations['to_add'].append((from_socket, to_socket))
 
-		for link_ptr in delta_links["added"]:
+		for link_ptr in delta_links['added']:
 			link = self._node_link_cache.link_ptrs_to_links.get(link_ptr)
-			if link is None: continue
+			if link is None:
+				continue
 
 			# Trigger Report Chain on Socket that Just Gained a Link
 			## Aka. Forward-Refresh Caches Relying on Linkage
 
-			if not (
+			if not (consent_added := link.to_socket.sync_link_added(link)):
-				consent_added := link.to_socket.sync_link_added(link)
-			):
 				# Did Not Consent to Addition: Queue Remove Link
-				link_alterations["to_remove"].append(link)
+				link_alterations['to_remove'].append(link)
 
 		# Execute Queued Operations
 		## - Especially undoing undesirable link changes.
 		## - This is important for locked graphs, whose links must not change.
-		for link in link_alterations["to_remove"]:
+		for link in link_alterations['to_remove']:
 			self.links.remove(link)
-		for from_socket, to_socket in link_alterations["to_add"]:
+		for from_socket, to_socket in link_alterations['to_add']:
 			self.links.new(from_socket, to_socket)
 
 		# If Queued Operations: Regenerate Cache
 		## - This prevents the next update() from picking up on alterations.
-		if link_alterations["to_remove"] or link_alterations["to_add"]:
+		if link_alterations['to_remove'] or link_alterations['to_add']:
 			self._node_link_cache.regenerate()
 
+
 ####################
 # - Post-Load Handler
 ####################
-def initialize_sim_tree_node_link_cache(scene: bpy.types.Scene):
+def initialize_sim_tree_node_link_cache(_: bpy.types.Scene):
-	"""Whenever a file is loaded, create/regenerate the NodeLinkCache in all trees.
+	"""Whenever a file is loaded, create/regenerate the NodeLinkCache in all trees."""
-	"""
 	for node_tree in bpy.data.node_groups:
-		if node_tree.bl_idname == "MaxwellSimTree":
+		if node_tree.bl_idname == 'MaxwellSimTree':
-			if not hasattr(node_tree, "_node_link_cache"):
+			node_tree.on_load()
-				node_tree._node_link_cache = NodeLinkCache(node_tree)
+
-			else:
-				node_tree._node_link_cache.regenerate()
 
 ####################
 # - Blender Registration
 ####################
 bpy.app.handlers.load_post.append(initialize_sim_tree_node_link_cache)
+## TODO: Move to top-level registration.
 
 BL_REGISTER = [
 	MaxwellSimTree,

src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/base.py

@@ -1,12 +1,11 @@
-import uuid
-
-import typing as typ
-import typing_extensions as typx
-import json
 import inspect
+import json
+import typing as typ
+import uuid
 
 import bpy
 import pydantic as pyd
+import typing_extensions as typx
 
 from .. import contracts as ct
 from .. import sockets

src/blender_maxwell/operators/__init__.py

@@ -1,10 +1,6 @@
-from . import install_deps
-from . import uninstall_deps
 from . import connect_viewer
 
 BL_REGISTER = [
-	*install_deps.BL_REGISTER,
-	*uninstall_deps.BL_REGISTER,
 	*connect_viewer.BL_REGISTER,
 ]
 BL_KMI_REGISTER = [

src/blender_maxwell/operators/connect_viewer.py

@@ -1,9 +1,10 @@
 import bpy
 
-class BlenderMaxwellConnectViewer(bpy.types.Operator):
+
-	bl_idname = "blender_maxwell.connect_viewer"
+class ConnectViewerNode(bpy.types.Operator):
-	bl_label = "Connect Viewer to Active"
+	bl_idname = 'blender_maxwell.connect_viewer_node'
-	bl_description = "Connect active node to Viewer Node"
+	bl_label = 'Connect Viewer to Active'
+	bl_description = 'Connect active node to Viewer Node'
 	bl_options = {'REGISTER', 'UNDO'}
 
 	@classmethod
@@ -12,7 +13,7 @@ class BlenderMaxwellConnectViewer(bpy.types.Operator):
 		return (
 			space.type == 'NODE_EDITOR'
 			and space.node_tree is not None
-			and space.node_tree.bl_idname == "MaxwellSimTreeType"
+			and space.node_tree.bl_idname == 'MaxwellSimTreeType'
 		)
 
 	def invoke(self, context, event):
@@ -26,11 +27,11 @@ class BlenderMaxwellConnectViewer(bpy.types.Operator):
 		select_node = context.selected_nodes[0]
 
 		for node in node_tree.nodes:
-			if node.bl_idname == "ViewerNodeType":
+			if node.bl_idname == 'ViewerNodeType':
 				viewer_node = node
 				break
 		else:
-			viewer_node = node_tree.nodes.new("ViewerNodeType")
+			viewer_node = node_tree.nodes.new('ViewerNodeType')
 			viewer_node.location.x = select_node.location.x + 250
 			viewer_node.location.y = select_node.location.y
 			select_node.select = False
@@ -46,22 +47,23 @@ class BlenderMaxwellConnectViewer(bpy.types.Operator):
 			node_tree.links.new(select_node.outputs[0], viewer_node.inputs[0])
 		return {'FINISHED'}
 
+
 ####################
 # - Blender Registration
 ####################
 BL_REGISTER = [
-	BlenderMaxwellConnectViewer,
+	ConnectViewerNode,
 ]
 
 BL_KMI_REGISTER = [
-	dict(
+	{
-		_=(
+		'_': (
-			BlenderMaxwellConnectViewer.bl_idname,
+			ConnectViewerNode.bl_idname,
-			"LEFTMOUSE",
+			'LEFTMOUSE',
-			"PRESS",
+			'PRESS',
-		),
-		ctrl=True,  ## CTRL
-		shift=True,  ## Shift
-		alt=False,  ## Alt
 		),
+		'ctrl': True,
+		'shift': True,
+		'alt': False,
+	},
 ]

src/blender_maxwell/operators/install_deps.py

@@ -1,62 +0,0 @@
-import sys
-import subprocess
-from pathlib import Path
-
-import bpy
-
-from . import types
-
-class BlenderMaxwellInstallDependenciesOperator(bpy.types.Operator):
-	bl_idname = types.BlenderMaxwellInstallDependencies
-	bl_label = "Install Dependencies for Blender Maxwell Addon"
-	
-	def execute(self, context):
-		addon_dir = Path(__file__).parent.parent
-		requirements_path = addon_dir / 'requirements.txt'
-		#addon_specific_folder = addon_dir / '.dependencies'
-		addon_specific_folder = Path("/home/sofus/src/college/bsc_ge/thesis/code/.cached-dependencies")
-		
-		# Create the Addon-Specific Folder
-		addon_specific_folder.mkdir(parents=True, exist_ok=True)
-		
-		# Determine Path to Blender's Bundled Python
-		python_exec = Path(sys.executable)
-		## bpy.app.binary_path_python was deprecated in 2.91.
-		## sys.executable points to the correct bundled Python.
-		## See <https://developer.blender.org/docs/release_notes/2.91/python_api/>
-		
-		# Install Dependencies w/Bundled pip
-		try:
-			subprocess.check_call([
-				str(python_exec), '-m',
-				'pip', 'install',
-				'-r', str(requirements_path), 
-				'--target', str(addon_specific_folder),
-			])
-			self.report(
-				{'INFO'},
-				"Dependencies for 'blender_maxwell' installed successfully."
-			)
-		except subprocess.CalledProcessError as e:
-			self.report(
-				{'ERROR'},
-				f"Failed to install dependencies: {str(e)}"
-			)
-			return {'CANCELLED'}
-		
-		# Install Dependencies w/Bundled pip
-		if str(addon_specific_folder) not in sys.path:
-			sys.path.insert(0, str(addon_specific_folder))
-		
-		return {'FINISHED'}
-
-
-
-####################
-# - Blender Registration
-####################
-BL_REGISTER = [
-	BlenderMaxwellInstallDependenciesOperator,
-]
-
-BL_KMI_REGISTER = []

src/blender_maxwell/operators/types.py

@@ -1,9 +0,0 @@
-import bpy
-
-####################
-# - Blender Types
-####################
-BlenderMaxwellInstallDependencies = "blender_maxwell.install_dependencies"
-BlenderMaxwellUninstallDependencies = "blender_maxwell.uninstall_dependencies"
-BlenderMaxwellConnectViewer = "blender_maxwell.connect_viewer"
-BlenderMaxwellRefreshRDAuth = "blender_maxwell.refresh_td_auth"

src/blender_maxwell/operators_nodeps/__init__.py

@@ -0,0 +1,7 @@
+from . import install_deps
+from . import uninstall_deps
+
+BL_REGISTER = [
+	*install_deps.BL_REGISTER,
+	*uninstall_deps.BL_REGISTER,
+]

src/blender_maxwell/operators_nodeps/install_deps.py

@@ -0,0 +1,66 @@
+import subprocess
+import sys
+from pathlib import Path
+
+import bpy
+
+from .. import registration
+
+
+class InstallPyDeps(bpy.types.Operator):
+	bl_idname = 'blender_maxwell.nodeps__install_py_deps'
+	bl_label = 'Install BLMaxwell Python Deps'
+
+	path_addon_pydeps: bpy.props.StringProperty(
+		name='Path to Addon Python Dependencies'
+	)
+	path_addon_reqs: bpy.props.StringProperty(
+		name='Path to Addon Python Dependencies'
+	)
+
+	def execute(self, _: bpy.types.Context):
+		path_addon_pydeps = Path(self.path_addon_pydeps)
+		path_addon_reqs = Path(self.path_addon_reqs)
+
+		# Create the Addon-Specific Folder (if Needed)
+		## It MUST, however, have a parent already
+		path_addon_pydeps.mkdir(parents=False, exist_ok=True)
+
+		# Determine Path to Blender's Bundled Python
+		## bpy.app.binary_path_python was deprecated in 2.91.
+		## sys.executable points to the correct bundled Python.
+		## See <https://developer.blender.org/docs/release_notes/2.91/python_api/>
+		python_exec = Path(sys.executable)
+
+		# Install Deps w/Bundled pip
+		try:
+			subprocess.check_call(
+				[
+					str(python_exec),
+					'-m',
+					'pip',
+					'install',
+					'-r',
+					str(path_addon_reqs),
+					'--target',
+					str(path_addon_pydeps),
+				]
+			)
+		except subprocess.CalledProcessError as e:
+			msg = f'Failed to install dependencies: {str(e)}'
+			self.report({'ERROR'}, msg)
+			return {'CANCELLED'}
+
+		registration.run_delayed_registration(
+			registration.EVENT__ON_DEPS_INSTALLED,
+			path_addon_pydeps,
+		)
+		return {'FINISHED'}
+
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	InstallPyDeps,
+]

src/blender_maxwell/operators_nodeps/uninstall_deps.py

@@ -0,0 +1,37 @@
+import shutil
+
+import bpy
+
+from ..utils import pydeps
+from .. import registration
+
+
+class UninstallPyDeps(bpy.types.Operator):
+	bl_idname = 'blender_maxwell.nodeps__uninstall_py_deps'
+	bl_label = 'Uninstall BLMaxwell Python Deps'
+
+	path_addon_pydeps: bpy.props.StringProperty(
+		name='Path to Addon Python Dependencies'
+	)
+
+	def execute(self, _: bpy.types.Context):
+		if (
+			pydeps.check_pydeps()
+			and self.path_addon_pydeps.exists()
+			and self.path_addon_pydeps.is_dir()
+		):
+			# CAREFUL!!
+			shutil.rmtree(self.path_addon_pydeps)
+		else:
+			msg = "Can't uninstall pydeps"
+			raise RuntimeError(msg)
+
+		return {'FINISHED'}
+
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	UninstallPyDeps,
+]

src/blender_maxwell/preferences.py

@@ -1,14 +1,173 @@
+import tomllib
+from pathlib import Path
+
 import bpy
 
-from .operators import types as operators_types
+from . import registration
+from .operators_nodeps import install_deps, uninstall_deps
+from .utils import logger as _logger
+from .utils import pydeps
 
+####################
+# - Constants
+####################
+log = _logger.get()
+PATH_ADDON_ROOT = Path(__file__).resolve().parent
+with (PATH_ADDON_ROOT / 'pyproject.toml').open('rb') as f:
+	PROJ_SPEC = tomllib.load(f)
+
+
+####################
+# - Preferences
+####################
 class BlenderMaxwellAddonPreferences(bpy.types.AddonPreferences):
-	bl_idname = "blender_maxwell"
+	bl_idname = PROJ_SPEC['project']['name']  ## MUST match addon package name
 
-	def draw(self, context):
+	####################
+	# - Properties
+	####################
+	# Default PyDeps Path
+	use_default_path_addon_pydeps: bpy.props.BoolProperty(
+		name='Use Default PyDeps Path',
+		description='Whether to use the default PyDeps path',
+		default=True,
+		update=lambda self, context: self.sync_use_default_path_addon_pydeps(
+			context
+		),
+	)
+	cache_path_addon_pydeps: bpy.props.StringProperty(
+		name='Cached Addon PyDeps Path',
+		default=(_default_pydeps_path := str(pydeps.DEFAULT_PATH_DEPS)),
+	)  ## Cache for use when toggling use of default pydeps path.
+	## Must default to same as raw_path_* if default=True on use_default_*
+
+	# Custom PyDeps Path
+	raw_path_addon_pydeps: bpy.props.StringProperty(
+		name='Addon PyDeps Path',
+		description='Path to Addon Python Dependencies',
+		subtype='FILE_PATH',
+		default=_default_pydeps_path,
+		update=lambda self, context: self.sync_path_addon_pydeps(context),
+	)
+	prev_raw_path_addon_pydeps: bpy.props.StringProperty(
+		name='Previous Addon PyDeps Path',
+		default=_default_pydeps_path,
+	)  ## Use to restore raw_path_addon_pydeps after non-validated change.
+
+	# TODO: LOGGING SETTINGS
+
+	####################
+	# - Property Sync
+	####################
+	def sync_use_default_path_addon_pydeps(self, _: bpy.types.Context):
+		# Switch to Default
+		if self.use_default_path_addon_pydeps:
+			self.cache_path_addon_pydeps = self.raw_path_addon_pydeps
+			self.raw_path_addon_pydeps = str(
+				pydeps.DEFAULT_PATH_DEPS.resolve()
+			)
+
+		# Switch from Default
+		else:
+			self.raw_path_addon_pydeps = self.cache_path_addon_pydeps
+			self.cache_path_addon_pydeps = ''
+
+	def sync_path_addon_pydeps(self, _: bpy.types.Context):
+		# Error if Default Path is in Use
+		if self.use_default_path_addon_pydeps:
+			self.raw_path_addon_pydeps = self.prev_raw_path_addon_pydeps
+			msg = "Can't update pydeps path while default path is being used"
+			raise ValueError(msg)
+
+		# Error if Dependencies are All Installed
+		if pydeps.DEPS_OK:
+			self.raw_path_addon_pydeps = self.prev_raw_path_addon_pydeps
+			msg = "Can't update pydeps path while dependencies are installed"
+			raise ValueError(msg)
+
+		# Update PyDeps
+		## This also updates pydeps.DEPS_OK and pydeps.DEPS_ISSUES.
+		## The result is used to run any delayed registrations...
+		## ...which might be waiting for deps to be satisfied.
+		if pydeps.check_pydeps(self.path_addon_pydeps):
+			registration.run_delayed_registration(
+				registration.EVENT__DEPS_SATISFIED,
+				self.path_addon_pydeps,
+			)
+		self.prev_raw_path_addon_pydeps = self.raw_path_addon_pydeps
+
+	####################
+	# - Property Methods
+	####################
+	@property
+	def path_addon_pydeps(self) -> Path:
+		return Path(bpy.path.abspath(self.raw_path_addon_pydeps))
+
+	@path_addon_pydeps.setter
+	def path_addon_pydeps(self, value: Path) -> None:
+		self.raw_path_addon_pydeps = str(value.resolve())
+
+	####################
+	# - UI
+	####################
+	def draw(self, _: bpy.types.Context) -> None:
 		layout = self.layout
-		layout.operator(operators_types.BlenderMaxwellInstallDependencies, text="Install Dependencies")
+		num_pydeps_issues = (
-		layout.operator(operators_types.BlenderMaxwellUninstallDependencies, text="Uninstall Dependencies")
+			len(pydeps.DEPS_ISSUES) if pydeps.DEPS_ISSUES is not None else 0
+		)
+
+		# Box: Dependency Status
+		box = layout.box()
+		## Row: Header
+		row = box.row(align=True)
+		row.alignment = 'CENTER'
+		row.label(text='Addon-Specific Python Deps')
+
+		## Row: Toggle Default PyDeps Path
+		row = box.row(align=True)
+		row.enabled = not pydeps.DEPS_OK
+		row.prop(
+			self,
+			'use_default_path_addon_pydeps',
+			text='Use Default PyDeps Install Path',
+			toggle=True,
+		)
+
+		## Row: Current PyDeps Path
+		row = box.row(align=True)
+		row.enabled = (
+			not pydeps.DEPS_OK and not self.use_default_path_addon_pydeps
+		)
+		row.prop(self, 'raw_path_addon_pydeps', text='PyDeps Install Path')
+
+		## Row: More Information Panel
+		row = box.row(align=True)
+		header, panel = row.panel('pydeps_issues', default_closed=True)
+		header.label(text=f'Dependency Conflicts ({num_pydeps_issues})')
+		if panel is not None:
+			grid = panel.grid_flow()
+			for issue in pydeps.DEPS_ISSUES:
+				grid.label(text=issue)
+
+		## Row: Install
+		row = box.row(align=True)
+		row.enabled = not pydeps.DEPS_OK
+		op = row.operator(
+			install_deps.InstallPyDeps.bl_idname,
+			text='Install PyDeps',
+		)
+		op.path_addon_pydeps = str(self.path_addon_pydeps)
+		op.path_addon_reqs = str(pydeps.PATH_REQS)
+
+		## Row: Uninstall
+		row = box.row(align=True)
+		row.enabled = pydeps.DEPS_OK
+		op = row.operator(
+			uninstall_deps.UninstallPyDeps.bl_idname,
+			text='Uninstall PyDeps',
+		)
+		op.path_addon_pydeps = str(self.path_addon_pydeps)
+
 
 ####################
 # - Blender Registration

src/blender_maxwell/registration.py

@@ -0,0 +1,113 @@
+import typing as typ
+from pathlib import Path
+
+import bpy
+
+from .utils import logger as _logger
+
+log = _logger.get()
+
+# TODO: More types for these things!
+DelayedRegKey: typ.TypeAlias = str
+BLClass: typ.TypeAlias = typ.Any  ## TODO: Better Type
+BLKeymapItem: typ.TypeAlias = typ.Any  ## TODO: Better Type
+KeymapItemDef: typ.TypeAlias = typ.Any  ## TODO: Better Type
+
+####################
+# - Globals
+####################
+BL_KEYMAP: bpy.types.KeyMap | None = None
+
+REG__CLASSES: list[BLClass] = []
+REG__KEYMAP_ITEMS: list[BLKeymapItem] = []
+
+DELAYED_REGISTRATIONS: dict[DelayedRegKey, typ.Callable[[Path], None]] = {}
+
+####################
+# - Constants
+####################
+EVENT__DEPS_SATISFIED: str = 'on_deps_satisfied'
+
+
+####################
+# - Class Registration
+####################
+def register_classes(bl_register: list):
+	for cls in bl_register:
+		if cls.bl_idname in REG__CLASSES:
+			msg = f'Skipping register of {cls.bl_idname}'
+			log.info(msg)
+			continue
+
+		bpy.utils.register_class(cls)
+		REG__CLASSES.append(cls)
+
+
+def unregister_classes():
+	for cls in reversed(REG__CLASSES):
+		bpy.utils.unregister_class(cls)
+
+	REG__CLASSES.clear()
+
+
+####################
+# - Keymap Registration
+####################
+def register_keymap_items(keymap_item_defs: list[dict]):
+	# Lazy-Load BL_NODE_KEYMAP
+	global BL_KEYMAP  # noqa: PLW0603
+	if BL_KEYMAP is None:
+		BL_KEYMAP = bpy.context.window_manager.keyconfigs.addon.keymaps.new(
+			name='Node Editor',
+			space_type='NODE_EDITOR',
+		)
+
+	# Register Keymaps
+	for keymap_item_def in keymap_item_defs:
+		keymap_item = BL_KEYMAP.keymap_items.new(
+			*keymap_item_def['_'],
+			ctrl=keymap_item_def['ctrl'],
+			shift=keymap_item_def['shift'],
+			alt=keymap_item_def['alt'],
+		)
+		REG__KEYMAP_ITEMS.append(keymap_item)
+	
+
+
+def unregister_keymap_items():
+	global BL_KEYMAP  # noqa: PLW0603
+
+	# Unregister Keymaps
+	for keymap_item in reversed(REG__KEYMAP_ITEMS):
+		BL_KEYMAP.keymap_items.remove(keymap_item)
+
+	# Lazy-Unload BL_NODE_KEYMAP
+	if BL_KEYMAP is not None:
+		REG__KEYMAP_ITEMS.clear()
+		BL_KEYMAP = None
+
+
+####################
+# - Delayed Registration Semantics
+####################
+def delay_registration(
+	delayed_reg_key: DelayedRegKey,
+	classes_cb: typ.Callable[[Path], list[BLClass]],
+	keymap_item_defs_cb: typ.Callable[[Path], list[KeymapItemDef]],
+) -> None:
+	if delayed_reg_key in DELAYED_REGISTRATIONS:
+		msg = f'Already delayed a registration with key {delayed_reg_key}'
+		raise ValueError(msg)
+
+	def register_cb(path_deps: Path):
+		register_classes(classes_cb(path_deps))
+		register_keymap_items(keymap_item_defs_cb(path_deps))
+
+	DELAYED_REGISTRATIONS[delayed_reg_key] = register_cb
+
+
+def run_delayed_registration(
+	delayed_reg_key: DelayedRegKey, path_deps: Path
+) -> None:
+	register_cb = DELAYED_REGISTRATIONS.pop(delayed_reg_key)
+	register_cb(path_deps)

src/blender_maxwell/requirements.txt

@@ -1,7 +0,0 @@
-tidy3d==2.5.2
-pydantic==2.6.0
-sympy==1.12
-scipy==1.12.0
-trimesh==4.1.4
-networkx==3.2.1 
-Rtree==1.2.0

src/blender_maxwell/utils/analyze_geonodes.py

@@ -1,7 +1,5 @@
 import typing_extensions as typx
 
-import bpy
-
 INVALID_BL_SOCKET_TYPES = {
 	"NodeSocketGeometry",
 }

src/blender_maxwell/utils/blender_type_enum.py

@@ -1,5 +1,6 @@
 import enum
 
+
 class BlenderTypeEnum(str, enum.Enum):
 	def _generate_next_value_(name, start, count, last_values):
 		return name

src/blender_maxwell/utils/extra_sympy_units.py

@@ -3,6 +3,7 @@ import functools
 import sympy as sp
 import sympy.physics.units as spu
 
+
 ####################
 # - Useful Methods
 ####################

src/blender_maxwell/utils/logger.py

@@ -0,0 +1,26 @@
+import logging
+
+LOGGER = logging.getLogger('blender_maxwell')
+
+
+def get():
+	if LOGGER is None:
+		# Set Sensible Defaults
+		LOGGER.setLevel(logging.DEBUG)
+		#FORMATTER = logging.Formatter(
+		#	'%(asctime)-15s %(levelname)8s %(name)s %(message)s'
+		#)
+
+		# Add Stream Handler
+		STREAM_HANDLER = logging.StreamHandler()
+		#STREAM_HANDLER.setFormatter(FORMATTER)
+		LOGGER.addHandler(STREAM_HANDLER)
+
+	return LOGGER
+
+def set_level(level):
+	LOGGER.setLevel(level)
+def enable_logfile():
+	raise NotImplementedError
+def disable_logfile():
+	raise NotImplementedError

src/blender_maxwell/utils/pydantic_sympy.py

@@ -1,10 +1,8 @@
-import typing as typ
-import typing_extensions as typx
-
 import pydantic as pyd
-from pydantic_core import core_schema as pyd_core_schema
 import sympy as sp
 import sympy.physics.units as spu
+import typing_extensions as typx
+from pydantic_core import core_schema as pyd_core_schema
 
 from . import extra_sympy_units as spux
 
@@ -45,8 +43,7 @@ class _SympyExpr:
 		
 		def validate_from_expr(value: AllowedSympyExprs) -> AllowedSympyExprs:
 			if not (
-				isinstance(value, sp.Expr)
+				isinstance(value, sp.Expr | sp.MatrixBase)
-				or isinstance(value, sp.MatrixBase)
 			):
 				msg = f"Value {value} is not a `sympy` expression"
 				raise ValueError(msg)
@@ -98,8 +95,7 @@ def ConstrSympyExpr(
 	## - <https://docs.sympy.org/latest/guides/assumptions.html#predicates>
 	def validate_expr(expr: AllowedSympyExprs):
 		if not (
-			isinstance(expr, sp.Expr)
+			isinstance(expr, sp.Expr | sp.MatrixBase),
-			or isinstance(expr, sp.MatrixBase),
 		):
 			## NOTE: Must match AllowedSympyExprs union elements.
 			msg = f"expr '{expr}' is not an allowed Sympy expression ({AllowedSympyExprs})"
@@ -143,7 +139,7 @@ def ConstrSympyExpr(
 		if (
 			allowed_matrix_shapes
 			and isinstance(expr, sp.MatrixBase)
-		) and not (expr.shape in allowed_matrix_shapes):
+		) and expr.shape not in allowed_matrix_shapes:
 			msgs.add(f"allowed_matrix_shapes={allowed_matrix_shapes} does not match expression {expr} with shape {expr.shape}")
 		
 		# Error or Return

src/blender_maxwell/utils/pydeps.py

@@ -0,0 +1,117 @@
+import contextlib
+import importlib.metadata
+import os
+import sys
+from pathlib import Path
+
+from . import logger as _logger
+
+log = _logger.get()
+
+####################
+# - Constants
+####################
+PATH_ADDON_ROOT = Path(__file__).resolve().parent.parent
+PATH_REQS = PATH_ADDON_ROOT / 'requirements.txt'
+DEFAULT_PATH_DEPS = PATH_ADDON_ROOT / '.addon_dependencies'
+DEFAULT_PATH_DEPS.mkdir(exist_ok=True)
+
+####################
+# - Globals
+####################
+DEPS_OK: bool | None = None
+DEPS_ISSUES: list[str] | None = None
+
+
+####################
+# - sys.path Context Manager
+####################
+@contextlib.contextmanager
+def importable_addon_deps(path_deps: Path):
+	os_path = os.fspath(path_deps)
+	sys.path.insert(0, os_path)
+	try:
+		yield
+	finally:
+		sys.path.remove(os_path)
+
+
+####################
+# - Check PyDeps
+####################
+def _check_pydeps(
+	path_requirementstxt: Path,
+	path_deps: Path,
+) -> dict[str, tuple[str, str]]:
+	"""Check if packages defined in a 'requirements.txt' file are currently installed.
+
+	Returns a list of any issues (if empty, then all dependencies are correctly satisfied).
+	"""
+
+	def conform_pypi_package_deplock(deplock: str):
+		"""Conforms a <package>==<version> de-lock to match if pypi considers them the same (PyPi is case-insensitive and considers -/_ to be the same)
+
+		See <https://peps.python.org/pep-0426/#name>"""
+		return deplock.lower().replace('_', '-')
+
+	with path_requirementstxt.open('r') as file:
+		required_depslock = {
+			conform_pypi_package_deplock(line)
+			for raw_line in file.readlines()
+			if (line := raw_line.strip()) and not line.startswith('#')
+		}
+
+	# Investigate Issues
+	installed_deps = importlib.metadata.distributions(
+		path=[str(path_deps.resolve())]  ## resolve() is just-in-case
+	)
+	installed_depslock = {
+		conform_pypi_package_deplock(
+			f'{dep.metadata["Name"]}=={dep.metadata["Version"]}'
+		)
+		for dep in installed_deps
+	}
+
+	# Determine Missing/Superfluous/Conflicting
+	req_not_inst = required_depslock - installed_depslock
+	inst_not_req = installed_depslock - required_depslock
+	conflicts = {
+		req.split('==')[0]: (req.split('==')[1], inst.split('==')[1])
+		for req in req_not_inst
+		for inst in inst_not_req
+		if req.split('==')[0] == inst.split('==')[0]
+	}
+
+	# Assemble and Return Issues
+	return [
+		f'{name}: Have {inst_ver}, Need {req_ver}'
+		for name, (req_ver, inst_ver) in conflicts.items()
+	] + [
+		f'Missing {deplock}'
+		for deplock in req_not_inst
+		if deplock.split('==')[0] not in conflicts
+	] + [
+		f'Superfluous {deplock}'
+		for deplock in inst_not_req
+		if deplock.split('==')[0] not in conflicts
+	]
+
+
+####################
+# - Refresh PyDeps
+####################
+def check_pydeps(path_deps: Path):
+	global DEPS_OK  # noqa: PLW0603
+	global DEPS_ISSUES  # noqa: PLW0603
+
+	if len(_issues := _check_pydeps(PATH_REQS, path_deps)) > 0:
+		#log.debug('Package Check Failed:', end='\n\t')
+		#log.debug(*_issues, sep='\n\t')
+
+		DEPS_OK = False
+		DEPS_ISSUES = _issues
+	else:
+		DEPS_OK = True
+		DEPS_ISSUES = _issues
+
+	return DEPS_OK

src/blender_maxwell/utils/tdcloud.py

@@ -2,10 +2,10 @@
 - SimulationTask: <https://github.com/flexcompute/tidy3d/blob/453055e89dcff6d619597120b47817e996f1c198/tidy3d/web/core/task_core.py>
 - Tidy3D Stub: <https://github.com/flexcompute/tidy3d/blob/453055e89dcff6d619597120b47817e996f1c198/tidy3d/web/api/tidy3d_stub.py>
 """
-from dataclasses import dataclass
-import typing as typ
-import functools
 import datetime as dt
+import functools
+import typing as typ
+from dataclasses import dataclass
 
 import tidy3d as td
 import tidy3d.web as td_web
@@ -284,7 +284,7 @@ class TidyCloudTasks:
 			raise RuntimeError(msg)
 		
 		# Upload Simulation to Cloud Task
-		if not upload_progress_cb is None:
+		if upload_progress_cb is not None:
 			upload_progress_cb = lambda uploaded_bytes: None
 		try:
 			cloud_task.upload_simulation(