WIP

changedetectionio/__init__.py

@@ -187,6 +187,10 @@ def main():
         logger.critical(str(e))
         return
 
+    # Inject datastore into plugins that need access to settings
+    from changedetectionio.pluggy_interface import inject_datastore_into_plugins
+    inject_datastore_into_plugins(datastore)
+
     if default_url:
         datastore.add_watch(url = default_url)
 

changedetectionio/blueprint/watchlist/templates/watch-overview.html

@@ -205,7 +205,7 @@ document.addEventListener('DOMContentLoaded', function() {
                         {%- if watch.get('restock') and watch['restock']['price'] != None -%}
                             {%- if watch['restock']['price'] != None -%}
                                 <span class="restock-label price" title="Price">
-                                {{ watch['restock']['price']|format_number_locale }} {{ watch['restock']['currency'] }}
+                                {{ watch['restock']['price']|format_number_locale if watch['restock'].get('price') else '' }} {{ watch['restock'].get('currency','') }}
                                 </span>
                             {%- endif -%}
                         {%- elif not watch.has_restock_info -%}

changedetectionio/pluggy_interface.py

@@ -2,6 +2,7 @@ import pluggy
 import os
 import importlib
 import sys
+from loguru import logger
 
 # Global plugin namespace for changedetection.io
 PLUGIN_NAMESPACE = "changedetectionio"
@@ -59,6 +60,31 @@ class ChangeDetectionSpec:
         """
         pass
 
+    @hookspec
+    def get_itemprop_availability_override(self, content, fetcher_name, fetcher_instance, url):
+        """Provide custom implementation of get_itemprop_availability for a specific fetcher.
+
+        This hook allows plugins to provide their own product availability detection
+        when their fetcher is being used. This is called as a fallback when the built-in
+        method doesn't find good data.
+
+        Args:
+            content: The HTML/text content to parse
+            fetcher_name: The name of the fetcher being used (e.g., 'html_js_zyte')
+            fetcher_instance: The fetcher instance that generated the content
+            url: The URL being watched/checked
+
+        Returns:
+            dict or None: Dictionary with availability data:
+                {
+                    'price': float or None,
+                    'availability': str or None,  # e.g., 'in stock', 'out of stock'
+                    'currency': str or None,      # e.g., 'USD', 'EUR'
+                }
+                Or None if this plugin doesn't handle this fetcher or couldn't extract data
+        """
+        pass
+
 
 # Set up Plugin Manager
 plugin_manager = pluggy.PluginManager(PLUGIN_NAMESPACE)
@@ -99,6 +125,22 @@ load_plugins_from_directories()
 # Discover installed plugins from external packages (if any)
 plugin_manager.load_setuptools_entrypoints(PLUGIN_NAMESPACE)
 
+# Function to inject datastore into plugins that need it
+def inject_datastore_into_plugins(datastore):
+    """Inject the global datastore into plugins that need access to settings.
+
+    This should be called after plugins are loaded and datastore is initialized.
+
+    Args:
+        datastore: The global ChangeDetectionStore instance
+    """
+    for plugin_name, plugin_obj in plugin_manager.list_name_plugin():
+        # Check if plugin has datastore attribute and it's not set
+        if hasattr(plugin_obj, 'datastore'):
+            if plugin_obj.datastore is None:
+                plugin_obj.datastore = datastore
+                logger.debug(f"Injected datastore into plugin: {plugin_name}")
+
 # Function to register built-in fetchers - called later from content_fetchers/__init__.py
 def register_builtin_fetchers():
     """Register built-in content fetchers as internal plugins
@@ -155,4 +197,36 @@ def collect_fetcher_status_icons(fetcher_name):
             if result and isinstance(result, dict):
                 return result
 
+    return None
+
+def get_itemprop_availability_from_plugin(content, fetcher_name, fetcher_instance, url):
+    """Get itemprop availability data from plugins as a fallback.
+
+    This is called when the built-in get_itemprop_availability doesn't find good data.
+
+    Args:
+        content: The HTML/text content to parse
+        fetcher_name: The name of the fetcher being used (e.g., 'html_js_zyte')
+        fetcher_instance: The fetcher instance that generated the content
+        url: The URL being watched (watch.link - includes Jinja2 evaluation)
+
+    Returns:
+        dict or None: Availability data dictionary from first matching plugin, or None
+    """
+    # Get availability data from plugins
+    results = plugin_manager.hook.get_itemprop_availability_override(
+        content=content,
+        fetcher_name=fetcher_name,
+        fetcher_instance=fetcher_instance,
+        url=url
+    )
+
+    # Return first non-None result with actual data
+    if results:
+        for result in results:
+            if result and isinstance(result, dict):
+                # Check if the result has any meaningful data
+                if result.get('price') is not None or result.get('availability'):
+                    return result
+
     return None

changedetectionio/processors/restock_diff/processor.py

@@ -187,6 +187,8 @@ class perform_site_check(difference_detection_processor):
 
 
         itemprop_availability = {}
+
+        # Try built-in extraction first, this will scan metadata in the HTML
         try:
             itemprop_availability = get_itemprop_availability(self.fetcher.content)
         except MoreThanOnePriceFound as e:
@@ -198,6 +200,33 @@ class perform_site_check(difference_detection_processor):
                                      xpath_data=self.fetcher.xpath_data
                                      )
 
+        # If built-in extraction didn't get both price AND availability, try plugin override
+        # Only check plugin if this watch is using a fetcher that might provide better data
+        has_price = itemprop_availability.get('price') is not None
+        has_availability = itemprop_availability.get('availability') is not None
+
+        # @TODO !!! some setting like "Use as fallback" or "always use", "t
+        if not (has_price and has_availability) or True:
+            from changedetectionio.pluggy_interface import get_itemprop_availability_from_plugin
+            fetcher_name = watch.get('fetch_backend', 'html_requests')
+
+            # Only try plugin override if not using system default (which might be anything)
+            if fetcher_name and fetcher_name != 'system':
+                logger.debug("Calling extra plugins for getting item price/availability")
+                plugin_availability = get_itemprop_availability_from_plugin(self.fetcher.content, fetcher_name, self.fetcher, watch.link)
+
+                if plugin_availability:
+                    # Plugin provided better data, use it
+                    plugin_has_price = plugin_availability.get('price') is not None
+                    plugin_has_availability = plugin_availability.get('availability') is not None
+
+                    # Only use plugin data if it's actually better than what we have
+                    if plugin_has_price or plugin_has_availability:
+                        itemprop_availability = plugin_availability
+                        logger.info(f"Using plugin-provided availability data for fetcher '{fetcher_name}' (built-in had price={has_price}, availability={has_availability}; plugin has price={plugin_has_price}, availability={plugin_has_availability})")
+                if not plugin_availability:
+                    logger.debug("No item price/availability from plugins")
+
         # Something valid in get_itemprop_availability() by scraping metadata ?
         if itemprop_availability.get('price') or itemprop_availability.get('availability'):
             # Store for other usage