#!/usr/local/bin/jsish
/* ROT-13 in Jsish */
function rot13(msg:string) {
    return msg.replace(/([a-m])|([n-z])/ig, function(m,p1,p2,ofs,str) {
        return String.fromCharCode(
            p1 ? p1.charCodeAt(0) + 13 : p2 ? p2.charCodeAt(0) - 13 : 0) || m;
    });
}
provide('rot13', Util.verConvert("1.0"));

/* rot13 command line utility */
if (isMain()) {
    /* Unit testing */
    if (Interp.conf('unitTest') > 0) {
;       rot13('ABJURER nowhere 123!');
;       rot13(rot13('Same old same old'));
        return;
    }

    /* rot-13 of data lines from given filenames or stdin, to stdout */
    function processFile(fname:string) {
        var str;
        if (fname == "stdin") fname = "./stdin";
        if (fname == "-") fname = "stdin";
        var fin = new Channel(fname, 'r');
        while (str = fin.gets()) puts(rot13(str));
        fin.close();
    }

    if (console.args.length == 0) console.args.push('-');
    for (var fn of console.args) {
        try { processFile(fn); } catch(err) { puts(err, "processing", fn); }
    }
}

/*
=!EXPECTSTART!=
rot13('ABJURER nowhere 123!') ==> NOWHERE abjurer 123!
rot13(rot13('Same old same old')) ==> Same old same old
=!EXPECTEND!=
*/