Fix task to build GH user components

Author: gonzalocasas

CHANGELOG.md

@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+* Added `compas_ghpython.fetch_ghio_lib` to simplify the loading of Grasshopper's IO library for extension developers.
+
 ### Changed
 
 ### Removed
@@ -52,9 +54,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Changed `compas_rhino.install_plugin` to remove broken symlinks.
 * Changed default Rhino version for installation to `7.0`.
 * Fixed bug in `compas_ghpython` related to importing `Grasshopper` prematurely.
-* Changed `compas.artists.Artist.ITAM_ARTIST` to context-based dict.
+* Changed `compas.artists.Artist.ITEM_ARTIST` to context-based dict.
 * Changed `compas_rhino.__init__.py` functions.
 * Changed `compas_ghpython.__init__.py` functions.
+* Renamed `compas_ghpython.get_grasshopper_plugin_path` to `compas_ghpython.get_grasshopper_managedplugin_path`.
 
 ### Removed
 

src/compas_ghpython/__init__.py

@@ -12,7 +12,11 @@
     compas_ghpython.utilities
 
 """
+import io
 import os
+import urllib
+import zipfile
+
 import compas
 import compas_rhino
 
@@ -24,7 +28,8 @@
 __all__ = [
     'get_grasshopper_managedplugin_path',
     'get_grasshopper_library_path',
-    'get_grasshopper_userobjects_path'
+    'get_grasshopper_userobjects_path',
+    'fetch_ghio_lib'
 ]
 __all_plugins__ = [
     'compas_ghpython.install',
@@ -82,3 +87,22 @@ def get_grasshopper_library_path(version):
 def get_grasshopper_userobjects_path(version):
     """Retrieve Grasshopper's user objects path"""
     return _get_grasshopper_special_folder(version, 'UserObjects')
+
+# =============================================================================
+# GH_IO Dll
+# =============================================================================
+
+def fetch_ghio_lib(target_folder='temp'):
+    """Fetch the GH_IO.dll library from the NuGet packaging system."""
+    ghio_dll = 'GH_IO.dll'
+    filename = 'lib/net48/' + ghio_dll
+
+    response = urllib.request.urlopen('https://www.nuget.org/api/v2/package/Grasshopper/')
+    dst_file = os.path.join(target_folder, ghio_dll)
+    zip_file = zipfile.ZipFile(io.BytesIO(response.read()))
+
+    with zip_file.open(filename, 'r') as zipped_dll:
+        with open(dst_file, 'wb') as fp:
+            fp.write(zipped_dll.read())
+
+    return dst_file

tasks.py

@@ -189,7 +189,7 @@ def prepare_changelog(ctx):
 
 
 @task(help={
-      'gh_io_folder': 'Folder where GH_IO.dll is located. Defaults to the Rhino 6.0 installation folder (platform-specific).',
+      'gh_io_folder': 'Folder where GH_IO.dll is located. If not specified, it will try to download from NuGet.',
       'ironpython': 'Command for running the IronPython executable. Defaults to `ipy`.'})
 def build_ghuser_components(ctx, gh_io_folder=None, ironpython=None):
     """Build Grasshopper user objects from source"""
@@ -199,9 +199,11 @@ def build_ghuser_components(ctx, gh_io_folder=None, ironpython=None):
             source_dir = os.path.abspath('src/compas_ghpython/components')
             target_dir = os.path.join(source_dir, 'ghuser')
             ctx.run('git clone https://github.com/compas-dev/compas-actions.ghpython_components.git {}'.format(action_dir))
+
             if not gh_io_folder:
+                gh_io_folder = 'temp'
                 import compas_ghpython
-                gh_io_folder = compas_ghpython.get_grasshopper_plugin_path('6.0')
+                compas_ghpython.fetch_ghio_lib(gh_io_folder)
 
             if not ironpython:
                 ironpython = 'ipy'