akory

#!/bin/bash

mena='\e[0;31m'
tsotra='\e[0;m'
maintso='\e[0;32m'

# fonction affichant un output d'aide au cas de mauvaise utilisation de la commande
function usage { 
    echo -e "Usage: ${maintso} $0 ${tsotra} [-d <delay>] text \n" 1>&2;
    echo -e "-d: write delay for each character. default 0.1" 1>&2;

    exit $1;
}


function typewriter
{
    text="$1"
    delay="$2"

    for i in $(seq 0 $(expr length "${text}")) ; do
        echo -en "${text:$i:1}"
        sleep ${delay}
    done

    echo
}


# Analyse des parametres entrée avec la commande
while getopts "d:" option; do
    case "${option}" in
        d)
            delay=${OPTARG}

            regex_number='^[0-9.]+$'
            if ! [[ $delay =~ $regex_number ]] ; then
                echo "${mena}Not a number $delay ${tsotra}"
                usage 1             
            fi
            ;;
        *)
            usage 1
            ;;
    esac
done
shift $((OPTIND-1))


if test ! -t 0; then
    text=`cat < /dev/stdin`
elif [ $# -le 0 ] ; then
    echo -e "${mena}Missing text \n${tsotra}";
    usage 1
else
    text=$@
fi


if [ ! -z "${delay}" ] ; then
    typewriter "$text" $delay
else
    typewriter "$text" .1
fi