How do I redirect stdout in blessed? - node.js

Question

Long story short: I want to build a CLI for a development daemon. Daemon outputs different kind of information to stdout and I want to relay that information to user in an area of screen, in scrollable fashion.
I am struggling with getting stdout to blessed. Simple prototype below, which buffers stdout, so information is never complete.
var blessed = require('blessed');
var screen = blessed.screen(),
body = blessed.box({
top: 1,
left: 0,
width: '100%',
height: '99%'
}),
statusbar = blessed.box({
top: 0,
left: 0,
width: '100%',
height: 1,
style: {
fg: 'white',
bg: 'blue'
}
});
screen.append(statusbar);
screen.append(body);
screen.key(['escape', 'q', 'C-c'], function(ch, key) {
return process.exit(0);
});
function status(text) { statusbar.setContent(text); screen.render(); }
function log(text) { body.insertLine(0, text); screen.render(); }
status('TEST');
var spawn = require('child_process').spawn;
yes = spawn('yes', ['it is']);
ls.stdout.on('data', function (data) {
log(data.toString());
});
ls.stderr.on('data', function (data) {
log(data.toString());
});

Answer 1

The line
var screen = blessed.screen()
Takes parameters in order to change where the input comes from, and where the output goes too. Logically, they're named input and output:
var screen = blessed.screen({ input: some_input_stream, output: some_output_stream })
So, you just chuck a writeable (or duplex) stream into the output parameter. Then, you can pipe the output anywhere you wish.