poll pypi servers until a desired version of a specif cpackage becomes available

wait_till_pip_ver_is_available.sh

#!/usr/bin/env bash

#set -x

package="fastai"
ver="1.0.14"

# is_pip_ver_available "1.0.14"
# returns 1 if yes, 0 otherwise
function is_pip_ver_available() {
    local ver="$1"
    local out="$(pip install $package== |& grep $ver)"
    if [[ -n "$out" ]]; then
        echo 1
    else
        echo 0
    fi
}

function wait_till_pip_ver_available() {

    if [[ $(is_pip_ver_available $ver) == "1" ]]; then
        echo "$package-$ver is available on pypi"
        return 1
    fi

    COUNTER=0
    echo "waiting for $package-$ver package to become visible on pypi:"
    while [[ $(is_pip_ver_available $ver) != "1" ]]; do
        echo -en "\\rwaiting: $COUNTER secs"
        COUNTER=$[$COUNTER +5]
	    sleep 5
    done
    echo -e "\rwaited: $COUNTER secs    "
    echo -e "$package-$ver is now available on pypi"
}

wait_till_pip_ver_available $ver