ponysay/ponysay

#!/usr/bin/env bash

version=0.4
SYSTEMPONIES=/usr/share/ponies
HOMEPONIES="${HOME}/.ponies"
pony=

cmd=cowsay
[[ ${0} == *ponythink ]] && cmd=cowthink

version() {
    echo "ponysay v$version"
}

usage() {
    version
    echo
    echo "Usage:"
    echo "${0##*/} [options]"
    echo
    echo "Options:"
    echo "  -v          Show version and exit"
    echo "  -h          Show this help and exit"
    echo "  -f[name]    Select a pony (Either a filename or a pony name)"
}

while getopts f:hv OPT
do
    case ${OPT} in
        v)  version; exit ;;
        h)  usage; exit ;;
        f)  pony=$OPTARG ;;
        \?) usage >&2; exit 1 ;;
    esac
done

# Pony not a file? Search for it
if [[ ! -f $pony ]]; then

    # Pony not set? Choose all
    [[ -z $pony ]] && pony="*"

    ponies=()

    [[ -d $SYSTEMPONIES ]] && ponies+=( "$SYSTEMPONIES"/$pony.pony )
    [[ -d $HOMEPONIES ]] && ponies+=( "$HOMEPONIES"/$pony.pony )

    if (( ${#ponies} < 1 )); then
      echo >&2 "All the ponies are missing! Call the Princess!"
      exit 1
    fi

    # Choose a random pony
    pony="${ponies[$RANDOM%${#ponies[@]}]}"
fi

# Ponies use UTF-8 drawing characters. Prevent a Perl warning.
export PERL_UNICODE=S

exec "$cmd" -f "$pony"