jq/jnv transparently

jq.sh

#!/bin/bash

readonly version="0.0.1"

for opt in ${@}
do
    case "${opt}" in
        "-h")
            echo A jq/jnv transparent wrapper
            exit 0
        ;;
        "-v")
            echo jq.sh version "${version}"
        ;;
    esac
done

case "${#}" in
    0)
        if [ -t 0 ]
        then
            echo error: no argument is passed
            exit 1
        else
            cat | jnv
        fi
        ;;
    1)
        if [ -t 0 ]
        then
            jnv "${1}"
        else
            cat | jq "${1}"
        fi
        ;;
    *)
        if [ -t 0 ]
        then
            jq "${@}"
        else
            cat | jq "${@}"
        fi
        ;;
esac