Using argparse module to parse commandline arguments

[DeepSpace2]

Hi! nice side project :)

I've created this PR to introduce the usage of the built-in argparse module to handle commandline arguments instead of manually parsing sys.argv.

I also fixed a small bug in the current implementation that allowed the usage of --solution flag to create a game with a non-guessable solution (for example, you could create a game using abcde as a solution, but could never guess it),

[o-nikolas]

This is likely out of scope for this PR, but since you're touching this code anyway. What are your thoughts on dropping --today and making it the default and adding --random. Everyone I've shown this project to have all had the same expectation that just starting this app up should give you today's wordle not a random wordle.

This would be an api change of course and would warrant a "major version release" of sorts :)

[DeepSpace2]

I definitely agree. I'll make this change.

[o-nikolas]

Any thoughts on this @klipspringr ?

[klipspringr]

I can understand that expectation, and if I started again I'd probably make this the default. Equally, the original audience for this was MetaFilter users who had already played the day's official game online and wanted more.

I think as society has probably reached Peak Wordle, at this point I'll only change existing user-facing API/behaviour if it's actually broken.

[klipspringr]

So, I should definitely have been using argparse from the beginning -- this PR is much nicer than my manual effort! Thank you for the contribution!

However this PR changes the usage from --today|DAY|SOLUTION to --today|--day DAY|--solution SOLUTION. I'm not sure I want to make a user-facing change for coding style reasons. I had a quick look at implementing the existing behaviour in argparse but I'm not sure it would be any cleaner than the existing code.

I have gone ahead and fixed (855b58) the bug you reported re allowing unguessable solutions (thanks!). I think it's fine to allow a fixed solution that is not in the official solutions list -- it just has to be in the guesses list.