debdown

#!/bin/sh

myname="${0##*/}"

# usage: check_cmd command
#     returns 1 if command exists
check_cmd_exist(){
    [ "$(command -v "$1" 2>/dev/null)" ] && printf '1\n'
}

can_dld=$(check_cmd_exist "dld")

show_help () {
    printf 'Usage: %s < package(s) >\n' "${myname}"
    printf '\tDownload .deb archive for the input package\n'
    printf '%s\n' "Options"
    printf '  %s' "-h, --help, help"
    printf '    %s\n' "show this help."
}

deb_url () {
    url=$(apt-get install --reinstall --print-uris -qq "$1" | cut -d"'" -f2 | grep "/${1}_")
    printf '%s\n' "$url"
}

deb_down () {
    PKG="$1"
    url=$(deb_url "$PKG")
    printf '%s\n\t%s\n\n' "${myname}: downloading '$PKG' from url:" "'$url'"
    if [ "$can_dld" = 1 ]; then
        dld "$url"
    else
        wget "$url"
    fi
}



########
# main #
########

if [ "${#}" -eq 0 ]; then
    show_help
else
    arguments=""
    while [ "${#}" -gt 0 ]; do
        case "$1" in
            help|-h|--help)
                show_help
                exit 0
                ;;
            *)
                arguments="$arguments $1"
                ;;
        esac
        shift
    done
    # we do want word splitting here
    # shellcheck disable=SC2086
    set -- $arguments
    for arg in "$@"; do
        deb_down "$arg"
    done
fi