recipetool: create: set up priority system for recipe handlers

Sometimes we want to force one handler to run before another; if the two
handlers are in different plugins that's difficult without some kind of
priority number, so add one and sort by it.

(From OE-Core rev: 0219d4fb9cefcee635387b46fc1d215f82753d92)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/recipetool/create.py

@@ -251,10 +251,22 @@ def create_recipe(args):
         lines_after.append('')
 
     # Find all plugins that want to register handlers
-    handlers = []
+    logger.debug('Loading recipe handlers')
+    raw_handlers = []
     for plugin in plugins:
         if hasattr(plugin, 'register_recipe_handlers'):
-            plugin.register_recipe_handlers(handlers)
+            plugin.register_recipe_handlers(raw_handlers)
+    # Sort handlers by priority
+    handlers = []
+    for i, handler in enumerate(raw_handlers):
+        if isinstance(handler, tuple):
+            handlers.append((handler[0], handler[1], i))
+        else:
+            handlers.append((handler, 0, i))
+    handlers.sort(key=lambda item: (item[1], -item[2]), reverse=True)
+    for handler, priority, _ in handlers:
+        logger.debug('Handler: %s (priority %d)' % (handler.__class__.__name__, priority))
+    handlers = [item[0] for item in handlers]
 
     # Apply the handlers
     classes = []