tabular data to the console (js)

README.md

this

var cfg = [
    {title:'TS',   attr:'ts',   length: 5, isRight:true},
    {title:'NAME', attr:'name', length:15, isRight:false},
    {title:'DATA', attr:'data', length:35, isRight:false, transform:JSON.stringify}
];

var arr = [
    {ts:  35, name:'metadata_changed', data:{pageURI:'http://videos.sapo.pt/asd'}},
    {ts: 551, name:'state_changed',    data:'play'},
    {ts: 555, name:'play'},
    {ts:1037, name:'time_updated',     data:0.279541}
];
console.log( tabular(, this._events) );

should output this:

    TS | NAME            | DATA                                
-------+-----------------+-------------------------------------
    35 | metadata_chang… | {"pageURI":"http://videos.sapo.pt/… 
   551 | state_changed   | "play"                              
   555 | play            | null                                
  1037 | time_updated    | 0.279541                            

tabular.js

function pad(n, chr) {
    if (n < 0) { return ''; }
    debugFunctionCall('pad', arguments);
    return new Array(n + 1).join(chr || ' ');
}

function justify(s, len, chr, isRight) {
    debugFunctionCall('justify', arguments);
    if (typeof s !== 'string') { s = '' + s; }
    if (chr === undefined) { chr = ' '; }
    var sLen = s.length;
    if (len < sLen) { // truncate
        s = s.substring(0, len-1) + '…';
        sLen = len;
    }
    var p = pad(len - sLen, chr);
    return ( isRight ? p + s : s + p );
}

function tabular(cfg, arr) {
    var o = [];

    // header
    o.push(' ');
    cfg.forEach(function(c) {
        o.push( justify(c.title, c.length, ' ', c.isRight), ' | ');
    });
    o.pop(); o.push(' ');

    // breaking line
    o.push('\n-');
    cfg.forEach(function(c) {
        o.push( justify('', c.length, '-', c.isRight), '-+-');
    });
    o.pop(); o.push('-');

    // each line
    arr.forEach(function(a) {
        o.push('\n ');
        cfg.forEach(function(c) {
            var v = a[c.attr];
            if (c.transform) { v = c.transform(v); }
            o.push( justify(v, c.length, ' ', c.isRight), ' | ');
        });
        o.pop(); o.push(' ');
    });

    return o.join('');
}