Plugin static files (#7763)

* add plugin_static template tag

* don't load plugins for collectstatic anymore as they are now collected seperatly

* fix clear plugin staic files bug with nested folder path

src/backend/InvenTree/InvenTree/ready.py

@@ -115,6 +115,7 @@ def canAppAccessDatabase(
         'makemessages',
         'compilemessages',
         'spectactular',
+        'collectstatic',
     ]
 
     if not allow_shell:
@@ -125,7 +126,7 @@ def canAppAccessDatabase(
         excluded_commands.append('test')
 
     if not allow_plugins:
-        excluded_commands.extend(['collectstatic', 'collectplugins'])
+        excluded_commands.extend(['collectplugins'])
 
     for cmd in excluded_commands:
         if cmd in sys.argv:

src/backend/InvenTree/plugin/staticfiles.py

@@ -1,7 +1,6 @@
 """Static files management for InvenTree plugins."""
 
 import logging
-from pathlib import Path
 
 from django.contrib.staticfiles.storage import staticfiles_storage
 
@@ -23,12 +22,15 @@ def clear_static_dir(path, recursive=True):
     dirs, files = staticfiles_storage.listdir(path)
 
     for f in files:
-        staticfiles_storage.delete(f'{path}/{f}')
+        staticfiles_storage.delete(f'{path}{f}')
 
     if recursive:
         for d in dirs:
-            clear_static_dir(f'{path}/{d}', recursive=True)
+            clear_static_dir(f'{path}{d}/', recursive=True)
-            staticfiles_storage.delete(d)
+            staticfiles_storage.delete(f'{path}{d}')
+
+    # Finally, delete the directory itself to remove orphan folders when uninstalling a plugin
+    staticfiles_storage.delete(path)
 
 
 def collect_plugins_static_files():

src/backend/InvenTree/plugin/templatetags/plugin_extras.py

@@ -2,6 +2,7 @@
 
 from django import template
 from django.conf import settings as djangosettings
+from django.templatetags.static import static
 from django.urls import reverse
 
 from common.notifications import storage
@@ -96,3 +97,27 @@ def notification_list(context, *args, **kwargs):
         }
         for a in storage.liste
     ]
+
+
+@register.simple_tag(takes_context=True)
+def plugin_static(context, file: str, **kwargs):
+    """Return the URL for a static file within a plugin.
+
+    Arguments:
+        file: The path to the file within the plugin static directory
+
+    Keyword Arguments:
+        plugin: The plugin slug (optional, will be inferred from the context if not provided)
+
+    """
+    plugin = context.get('plugin', None)
+
+    if plugin:
+        plugin = plugin.slug
+    else:
+        plugin = kwargs.get('plugin', None)
+
+    if not plugin:
+        return file
+
+    return static(f'plugins/{plugin}/{file}')