#! /bin/zsh
#
# this file:
#   https://dataswamp.org/~incal/conf/.zsh/url

yewtube () {
    local url=$1
    local youtube='https://www.youtube.com/watch?v='
    local sub_str="${url##*youtube*}"
    if [ $sub_str ]; then
        echo $url
    else
        local last=${url//$youtube/}
        echo "$url - http://yewtu.be/$last"
    fi
}

url-exists () {
    local url=$1
    echo ${${${(z)${"${(f)$(curl -s -I $url)}"[1]}}[2,-1]}%%$'\r'}
}