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#!/bin/bash
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# Sets a password environment variable
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env_password_main ()
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{
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    local self="$(readlink -f -- "${BASH_SOURCE[0]}")"
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    set -o pipefail
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    local store=
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    test "$1" = - && { store=1; shift;}
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    # Was run without initial ".", or with insufficient parameters
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    if test "${BASH_LINENO[1]}" = 0 -o "$#" -lt 1; then
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        echo "Usage: . $self env_var [desc] (note initial \".\")"|fold -s >&2
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        return 2
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    fi
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    local desc="$2"
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    test -n "$desc" || desc="the $1 password"
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    function trace() { for arg in "$@"; do printf "%q " "$arg"; done; echo;}
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    function traceSelf() { trace . "$self" - "$@";}
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    if test -n "$store" -o -z "${!1+t}"; then # env var with name $1 is unset
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        if test -n "$store"; then
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            echo " To change the saved value for $desc, run: " >&2
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            traceSelf "$@" >&2
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        else
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            test -t 2 && ccTty= || ccTty=1 # cc the tty if stderr is a log file
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            {
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                echo " You must first store $desc. \
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At the shell, run: "
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                traceSelf "$@"
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            }|tee ${ccTty:+/dev/tty} >&2
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        fi
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        test -z "$store" && return 1 # just direct user how to store password
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        read -s -p "Enter $desc: "; echo
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        export "$1"="$REPLY"
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    fi
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}
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env_password_main "$@"
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