Avoid using pickle and unpickle for loading and saving games

[shlomif]

Hi all!

See https://docs.python.org/3/library/pickle.html - it is insecure and makes it hard to share saved game files. We need a different format - perhaps https://metacpan.org/pod/File::Dir::Dumper::Stream::JSON::Reader or https://en.wikipedia.org/wiki/YAML .

[shlomif]

Update: seems like kpat already has an xml-based format for saved games which we can adopt instead of inventing our own new one. See https://en.wikipedia.org/wiki/Interoperability .

[shlomif]

I started preliminary work on this here - https://github.com/shlomif/PySolFC/tree/kpat-saved-games--issue93 .

[math1414]

Just wanted to follow up on thread #426. I can now read in the old pso files, and study my solutions. Next on my wish list is to export the solutions to some format readable by another program. Currently you can export positions (to text files) but you cannot export sequences of moves.
I'm curious, in your preliminary work on this, are you targeting Freecell specifically, or other games available on Pysol? It's an interesting question whether there are even notations for some of the others, such as Mahjongg.

[shlomif]

Just wanted to follow up on thread #426. I can now read in the old pso files, and study my solutions. Next on my wish list is to export the solutions to some format readable by another program. Currently you can export positions (to text files) but you cannot export sequences of moves. I'm curious, in your preliminary work on this, are you targeting Freecell specifically, or other games available on Pysol? It's an interesting question whether there are even notations for some of the others, such as Mahjongg.

@math1414 : hi. I think I only started to write tests and production code for a predictable kpat-compatible xml emitter. My intention was to use it for freecell to start with, but I didn't get so far.