#!/usr/bin/env bash
# escape4sh -- Escape given command-line arguments as a string that
#              is safe to use as input for shells, e.g., sh -c ...
#
# > sh -c "$(escape4sh ARG...)"
##
# Author: Jaeho Shin <netj@cs.stanford.edu>
# Created: 2013-01-24
[[ $# -eq 0 ]] || {
    # construct a jq expression that applies shell escaping for each given argument
    i=0 jqExpr=
    for a; do
        let ++i
        argsExpr+=' --arg a'$i' "$'$i'"'
        jqExpr+='($a'$i' | @sh), '
    done
    jqExpr=${jqExpr%, }
    # then run it
    eval "jq --null-input --raw-output $argsExpr '[$jqExpr] | join(\" \")'"
}