Naval Fate.

Usage:
  naval_fate ship new <name>...
  naval_fate ship <name> move <x> <y> [--speed=<kn>]
  naval_fate ship shoot <x> <y>
  naval_fate mine (set|remove) <x> <y> [--moored|--drifting]
  naval_fate -h | --help
  naval_fate --version

Options:
  -h --help     Show this screen.
  --version     Show version.
  --speed=<kn>  Speed in knots [default: 10].
  --moored      Moored (anchored) mine.
  --drifting    Drifting mine.


helptext = [preamble] [usage options] [examples]

preamble = [program-name]

usage = %s"usage:"
options = %s"options:"
shorthelp = "-" 1*ALPHA [parameter] 2SP *ALPHA [default: 1*ALPHA]
longhelp = "--" 1*ALPHA["="][parameter] 2SP *ALPHA

program-name = 1*CHAR

name = 1*ALPHA
parameter = 1*("<" name ">") [repetition]
repetition = *SP "..." *SP

examples = *CHAR ; common usage examples