How to use

krita-exporter /dir/with/your/kra/file/tree /dir/where/you/want/your/exported/file/tree

So for example, if this is your source directory:

img/
	backgrounds/
		level1.kra
		level2.kra
		level3.kra
		bonus_level.kra
	sprites/
		protagonist.kra
		enemy_skeleton.kra

Your destination directory will look like this after running the command:

img/
	backgrounds/
		level1.png
		level2.png
		level3.png
		bonus_level.png
	sprites/
		protagonist.png
		enemy_skeleton.png

optional arguments:

  -h, --help     show this help message and exit
  --force        Export even those files which already have not been modified
				 since the last export.
  --purge        empty destination folder before refilling
  -c, --confirm  manually confirm that the changed files are the ones you want
				 to change
  -w, --watch    poll directory for changes, run until exited.

Beyond that just read the code, it's pretty small :)