a fancy loading animation using some shell scripting logic

shellExperiment.sh

# copy and paste the function into a bash and load into memory
# type: loadingAnimation

# function that increments and decrements forever
loadingAnimation()
{
    #local variables? / state
    duration=0
    c=0
    toggle=true
    s=""

    while [ true ]
    do
        clear
        if [ "$toggle" = true ]
        then
            ((c++))
            s+="."
            if [ "$c" -gt 50 ]
            then
                #switching
                toggle=false
            fi

        else
            c=$((c-1))
            s=${s: : -1}
            if [ "$c" -lt 1 ]
            then
                #switching
                toggle=true
            fi
        fi

        ((duration++))
        if [ "$duration" -eq 400 ]
        then
            # exit status 0
            return
        fi

        echo "loading"
        echo "$s"
        sleep 0.03
    done
}