Main features

FLAP is inspired by the python great module argparse, thus many features are taken from it. Here the main features are listed.

• User-friendly methods for building flexible and effective Command Line Interfaces (CLI);
• comprehensive Command Line Arguments (CLA) support:
  • support optional and non optional CLA;
  • support boolean CLA;
  • support positional CLA;
  • support list of allowable values for defined CLA with automatic consistency check;
  • support multiple valued (list of values, aka list-valued) CLA:
    • compiletime sized list, e.g. nargs='3';
    • runtime sized list with at least 1 value, e.g. nargs='+';
    • runtime sized list with any size, even empty, e.g. nargs='*';
  • support mutually exclusive CLAs;
  • self-consistency-check of CLA definition;
  • support fake CLAs input from a string;
  • support fake CLAs input from environment variables;
• comprehensive command (group of CLAs) support:
  • support nested subcommands;
  • support mutually exclusive commands;
  • self-consistency-check of command definition;
• automatic generation of help and usage messages;
• consistency-check of whole CLI definition;
• errors trapping for invalid CLI usage;
• POSIX style compliant;
• automatic generation of MAN PAGE using your CLI definition!;
• replicate all the useful features of argparse;
• implement docopt features.
• implement click features.