i want to write a xcf file creation plugin

[plexigras]

i have multiple directory's containing images all of them should get converted to xcf files and if there are files with the same name in another directory the xcf file should have all of them as layers.

as an example:

input_a/1.png
input_b/1.png
input_c/1.png

get converted into

output/1.xcf

which contains 3 layers called input_a, input_b and input_c.

any help would be appreciated.

like why dose this plugin not work?
https://www.gimp.org/tutorials/AutomatedJpgToXcf/

or are there other plugins i should take a look at?

or anything really.