Custom command-line argument parsing?

[iafisher]

Pros

• I'd like to have more control over the help and error messages.
• There doesn't seem to be a way to have both a positional argument and subcommands (i.e., I want quiz whatever to open the quiz whatever but quiz count to invoke the count subcommand).

Cons

• More complex implementation
  • However, if I go ahead with #72 there will be a lot fewer commands and flags to deal with.

[iafisher]

I have decided that the cons outweigh the pros.