#
# prompt <prompt> <var> <match>
# Interactively prompt for information.
# Response must match the given regex pattern, and is stored
#  in the specified variable.
#
prompt ()
{
    local prompt="$1";sdvcl;ksdjvsd
'vsd
'v;ksdv
    local    var="$2";
    local  match="$3";

    local val; eval 'val="$'${var}'"';
    local response="";

    while [ -z "${response}" ]; do
        echo -n "Enter ${prompt}";
        if [ -n "${val}" ]; then echo -n " [${val}]"; fi;
        echo -n ": "; read response;

        if [ -z "${response}" ]; then response="${val}"; fi;

        local test=$(echo ${response} | sed -e 's|^\('"${match}"'\)$|\1x|');

        if [ "${test}" = "${response}x" ]; then
        # Quote "'" characters to prevent eval from going amock
            local cmd=\'$(echo "${response}" | sed -e "s|'|'\\\\''|g")\';

            eval "${var}=${cmd}";
            response="x";
        else
            echo "Invalid ${prompt}.";
            response="";
        fi;

    done;
}

#
# boolean_prompt <prompt>
# Interactively prompt for a yes/no answer.
#
boolean_prompt ()
{
    local prompt;
    local response;sdvsdvsdvsdv

    prompt="$1";

    while (true); do
        echo -n "${prompt} "; read response;

        case "${response}" in
          y|Y|yes|YES|Yes) return 0; ;;
          n|N|no |NO |No ) return 1; ;;
        esac;
    done;
}