realtime console in nodejs. node.js enables to integrate tooling into the application. for a quick tab refresh to build front end tooling.

rtconsole.js

//functions.js
//f.rtconsole('generate.py build','/mnt/hda1/www/bursa/public/charts/generate.py',['build'],req,res,purl)
var tempstreams={};
function rtconsole(streamname,command,command_args,req,res,purl)
{
    //var streamname='genbuild';
    //if(global.tempstreams===undefined)tempstreams={}; // ceate some global to store text and status
    if(tempstreams[streamname]===undefined)tempstreams[streamname]={};
    var tempstream=tempstreams[streamname];
    if(tempstream.text===undefined)tempstream.text="";
    if(tempstream.working===undefined)tempstream.working=false;
    if(tempstream.busy===undefined)tempstream.busy=false;

    res.writeHead(200, 
    {
     'Cache-Control': 'no-cache',
     'Pragma': 'no-cache',
     'Content-Type': 'text/html',
     'Expires':"Tue, 01 Jan 2000 12:12:12 GMT"
    });
    
    var spawn = require('child_process').spawn
    if(!tempstream.working && !tempstream.busy)
    {
     f.log('rtconsole running: '+streamname);
     tempstream.working=true;
     tempstream.text="";
     var runcommand    = spawn(command,command_args)
     runcommand.stdout.on('data', function (data) { if(data[0]==8) return; tempstream.text+=data.toString('utf-8')+'\r\n'; });
     runcommand.stderr.on('data', function (data) { if(data[0]==8) return; tempstream.text+=data.toString('utf-8')+'\r\n';  });
     runcommand.on('close',       function (code) {                        tempstream.text+=':-)'; tempstream.busy=true; tempstream.working=false; setTimeout(function(){tempstream.busy=false;},1500); });
    }
    //    if(tempstream.working)   res.write('<script>setTimeout(function(){location.reload(false)},500)</script>');
    if(tempstream.working&&!purl.query.json)
     res.write('<script>'+
'function requ()'+'\r\n'+
'{'+'\r\n'+
' var xhr = new XMLHttpRequest(); '+'\r\n'+
' xhr.open("GET", location.href+"?json=1", true);'+'\r\n'+
' xhr.onreadystatechange = function()'+'\r\n'+
' {'+'\r\n'+
'  if (xhr.readyState == 4)'+'\r\n'+
'  {'+'\r\n'+
'   var resp={}; '+'\r\n'+
'   try{resp=JSON.parse(xhr.responseText)}catch(e){}'+'\r\n'+
'   document.getElementById("resp").innerHTML = resp.text;'+'\r\n'+
'   if(resp.working)setTimeout(requ,500);'+'\r\n'+
'  }'+'\r\n'+
' };'+'\r\n'+
' xhr.send();'+'\r\n'+
'}'+'\r\n'+
'requ();'+'\r\n'+
    '</script>');
    res.end(purl.query.json?JSON.stringify(tempstream):'<pre id="resp">\r\n'+tempstream.text+'</pre>');

}
exports.rtconsole=rtconsole;


var f=require('functions.js')

  if(purl.pathname=='/gensource')
  {
    f.rtconsole('generate.py source','/mnt/hda1/www/bursa/public/charts/generate.py',['source'],req,res,purl);
  }
  else if(purl.pathname=='/genbuild')
  {
    f.rtconsole('generate.py build','/mnt/hda1/www/bursa/public/charts/generate.py',['build'],req,res,purl)
  }