i want to write a xcf file creation plugin

[Ofnuts]

See ofn-coalesce-images.

• It adds a "Coalesce images" at the bottom of the File menu
  
• When you hit it, you get a dialog asking for two directories:
  • The root of all the directories with the input files
    
  • The directory where the XCF will be saved (recommendation: not in the input tree)
    
• The script scans all files under the root tree, and attempts to create XCF files by stacking all the file with the exact same name in the varoius directories.
  

Warnings:

• More of the "full-speed ahead and damn the torpedoes" kind. Doesn't catch errors or try graceful recovery.
  
• Files should have the very same name (no case variations) and extension.
  
• Layers are stacked in directory name order (bottom being first).
  

Enjoy