#compdef pihex

_pihex()
{
  _arguments -S \
    '--formula=[Formula to use]:formula name:((
      bbp\:"Bailey-Borwein-Plouffe formula (default)"
      bellard\:"Bellard'\''s formula"))' \
    '1: :_guard "^-*" "place of digits (default: 0)"' \
    '(- 1 *)'{-V,--version}'[Prints version information]' \
    '(- 1 *)'{-h,--help}'[Prints help information]'
}