small plugin code help

[Ofnuts]

This is because you used dashes (gimp-drawable-edit-clear) instead of underscores: (gimp_drawable_edit_clear). For Python you are therefore trying to subtract a variable called drawable from pdb.gimp. The Python doc is auto-generated and since the same text is used for script-fu and python-fu, there are things to adapt:

• all dashes become underscores
  
• object IDs in script-fu are plain objects in Python (so you get a gimp.Image object, not an integer)
  
• when there is no object instead of using the -1 ID you use None
  

Also, don't use image.active_layer. If you script registration is correct, your script is passed a layer as the second argument and this is the layer you should work with. Using image.active_layer doesn't do you any good because if the active drawable isn't a layer (because it is a mask/channel), then image.active_layer returns None.