Turns a python requirements.txt file into a flatpak manifest compatible dependency list.
(note: this implementation is in alpha/proof-of-concept state, see "Implementation Notes" below)
If you ever wanted to ship your app as a flatpak, you probably started by creating a flatpak manifest. And if that app is a python app that depends on a bunch of packages from pypi, you probably realized it's not that easy to create the list of sources for your dependencies: you're used to pip doing it for you and you only keep a list of names and versions, not urls and checksums like flatpak needs.
This is where flatpak-pypi comes to your aid: Instead of having to manually download every single python package you depend on, note the checksum, and add it to your manifest, flatpak-pypi automates the process! just give it your requirements.txt and your flatpak manifest, and it'll do the rest!
./flatpak-pypi.py <requirements_file> <flatpak_manifest>
flatpak-pypi will modify your manifest, but keep a backup in case it does something wrong.
Note that at the moment, it doesn't support "updating", and to prevent duplicate modules it will not modify the json file if it has all the modules. So if you want to update one of your dependencies, the easiest thing to do is to remove it from the json manually, and then run flatpak-pypi again.
The way I implemented this is a bit hacky, because I wanted to get something working as quickly as possible… so at the moment this creates a virtualenv, invokes pip in it to download the packages, and then uses the pypi json api to find the URLs for the packages. This is, of course, awfully inefficient.
A better implementation should parse requirements.txt itself, and use the pypi json api only, without invoking any subprocesses.
GPLv3+