"resize" event not working?

[laurent22]

I'm trying to get the resize event to work, or simply to get the new terminal height whenever it's resized, but it's not working so far.

I've narrowed it down to this simple script:

var term = require( 'terminal-kit' ).terminal ;

setInterval(function() {
	console.info(term.height);
}, 1000);

term.on('resize', function(width, height) {
	console.info('Resize: ' + width + ', ' + height);
});

This will continuously print the same size, even as I resize the terminal, and the "resize" event is never fired.

If I Ctrl+C the script and start it again, it will then pick up the new terminal size, so it's getting it right but it just never updates once the script starts.

I've tried in ConEmu and the default Windows terminal, both under WSL and DOS but none of these are working. Any idea what could be the issue?

[cronvel]

@laurent22 Can you test it with those events:

• process.stdout.on( 'resize' , callback )
• process.on( 'SIGWINCH' , callback )

Terminal-kit use Node for that, and I don't know if Windows reports terminal resizing at all.

Please, can you check the process.stdout.isTTY value.

[cronvel]

Apparently, this is a known issues in the node.js repository .

[laurent22]

process.on( 'SIGWINCH' , callback )

Seems that's the key. If I add an event listener for this, then the rest of it suddenly works. i.e. this doesn't work:

var term = require( 'terminal-kit' ).terminal ;

console.info('process.stdout.isTTY = ' + process.stdout.isTTY);

setInterval(function() {
	console.info(term.height);
}, 1000);

term.on('resize', function(width, height) {
	console.info('Resize: ' + width + ', ' + height);
});

process.stdout.on('resize', function() {
	console.info('Resize (process.stdout)');
});

However if I add this at the bottom:

process.on('SIGWINCH', function() {
	console.info('Resize (SIGWINCH)');
});

Then this event handler and the two previous ones also start working, so it seems adding this triggers something that makes terminal-kit (and node) detect resize events correctly.

process.stdout.isTTY is true on my machine.

Maybe the solution would be to enable the SIGWINCH method if the operating system is Windows, regardless of isTTY?

[cronvel]

@laurent22 Wow, what an incredibly awkward behavior... -_-'
Was that tested inside WSL?

[laurent22]

Yes that was inside WSL, from ConEmu (in tmux if it makes a difference).

[cronvel]

@laurent22 Does this fix this issue?

[laurent22]

Unfortunately it still shows the same problem. I've tried running the file all-event-test.js and it didn't detect the resize event. However again if I add this line at the bottom: process.on('SIGWINCH', function() {}); then the call term.on( 'resize'... magically starts working.

[cronvel]

@laurent22 Argh... what is the value of process.platform?

[laurent22]

Oh right I see you have a check on process.platform, but on Windows WSL it actually returns "linux". If needed there's a package here that can detect WSL: https://github.com/ianmitchell/is-windows-bash

[refack]

Can anyone check if this reproduces with node@8.7.0?

[cronvel]

@laurent22 ?

[laurent22]

@refack, yes it's still happening in node 8.7.0. This doesn't work;

setInterval(function() {}, 1000);

process.stdout.on('resize', function() {
	// Never fires
	console.info('Resize (process.stdout)');
});

But with the empty process.on('SIGWINCH', function() {}); at the bottom it does:

setInterval(function() {}, 1000);

process.stdout.on('resize', function() {
	console.info('Resize (process.stdout)'); // It works
});

process.on('SIGWINCH', function() {});

[refack]

@laurent22 thanks!
Now waiting for nodejs/node#16225

[laurent22]

Brilliant, thanks for the update!