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'use strict';

function escapeArgument(arg, quote) {
    // Convert to string
    arg = '' + arg;

    // If we are not going to quote the argument,
    // escape shell metacharacters, including double and single quotes:
    if (!quote) {
        arg = arg.replace(/([()%!^<>&|;,"'\s])/g, '^$1');
    } else {
        // Sequence of backslashes followed by a double quote:
        // double up all the backslashes and escape the double quote
        arg = arg.replace(/(\\*)"/g, '$1$1\\"');

        // Sequence of backslashes followed by the end of the string
        // (which will become a double quote later):
        // double up all the backslashes
        arg = arg.replace(/(\\*)$/, '$1$1');

        // All other backslashes occur literally

        // Quote the whole thing:
        arg = '"' + arg + '"';
    }

    return arg;
}

module.exports = escapeArgument;