Hi,
I have finished to code a first version of a tool allowing to compile a ZIM file based on a local directory with HTML content. This tool is called zimwriterfs.
The tool is fast and pretty easy to use and to compile. I would appreciate if people would test it and give me a few feedbacks: https://sourceforge.net/p/kiwix/other/ci/master/tree/zimwriterfs/
Have a look to the README fore more details: https://sourceforge.net/p/kiwix/other/ci/master/tree/zimwriterfs/README
Regards Emmanuel