#!/usr/bin/env bash
# ./check4u -- check for updates of a software package

twelf_latest() {
    local WEBPAGE='http://twelf.org/wiki/Download'
    local DOWNLOAD_LINK=`curl --silent $WEBPAGE |
         grep -oP --color=NEVER '"http://twelf\.org/releases/twelf-src-[\w.]+\.tar\.gz"'`
    LATEST=${DOWNLOAD_LINK#*/twelf-src-}
    LATEST=${LATEST%.tar.gz\"}
}
twelf_current() {
    source PKGBUILD &&
        CURRENT="$pkgver"
}

twelf_latest && twelf_current

if [[ "$LATEST" != "$CURRENT" ]]; then
    echo -e "Latest release   : $LATEST"
    echo -e "Currently on AUR : $CURRENT"
    exit 1
fi