ka Invites - VideoChat

@Kit Langton @TheMatten @Bolt I've invited you all to ka GitHub repo.

Thanks @Sridhar Ratnakumar ! I was just poking around the Neuron repo :)

Is there any "homework" you recommend doing?

Thanks!

@Bolt Install Nix, and follow the README to get the app running on ./guide ... then on your own notes.

With ka open by side, edit the notes using an editor (vscode preferred; using guide/.vscode configuration)

Basically run these two commands:

code ./guide  # `nix-shell --run code` if you don't have it; but of course you can edit with any editor
$(nix-build)/bin/ka ./guide

(Assuming you are on Linux; otherwise, see web app section in README to replace the second command)

(Install the recommended extensions if you open with vscode; you'll get nice auto complete for links)

Invitation returns 404 for me :sweat_smile:

Same for me but I realised I wasn't logged in in GitHub. Then everything worked out fine!

https://github.com/SridCircle/ka

Building with Nix, I can see it's quite heavy, almost 10Gb

Is that supposed?

@Bolt What's 10Gb?

10Gigabytes of disk memory

Because Nix installs every dependency

If it is the nix store, see which derivations take the most space by running:

nix-shell -p ncdu --run 'ncdu /nix'

I'm curious if anybody is able to run the Gtk+ app.

Also I'm getting Error : Unexpected Duplicate. syncCallbacks=True nBatch=7 nExpected=9

When I run the webapp

Try refreshing? Does the web app otherwise work?

The UI freezes when I refresh

Restart server. Close tab; open tab.

(It uses jsaddle-warp, which is like unreliable 5% of the times; which is why I use the Gtk+ version)

And I don't compile a GHCJS version, because that would require splitting frontend and backend. Right now, they all run in the same process. This is a neat thing about jsaddle bridge; you can do anything including IO from your reflex "frontend" app.

image.png

I refreshed and the UI was responsive but as soon I clicked something it froze

The bridge is also the reason why the web app might feel laggy (because everything, including frontend logic, runs on the server - with the bridge communicating all DOM updates to the browser)

Which browser?

Might be this bug:

It fails in Firefox because Firefox completely disallows synchronous XHR requests. Chrome is less strict.
https://github.com/ghcjs/jsaddle/issues/64#issuecomment-646254884

Just use Chrome :grinning_face_with_smiling_eyes:

Or the Gtk+ version

Oh I see! Yeah I'm using firefox!

@Bolt Did the Gtk+ version compile and run?

I'll try the GTK version just need to delete the nix build eheh

no space left on mymachine

I was buying a laptop before joining my first Haskell job (Obsidian Systems); and when asked for advice, the only thing they told me was to get at least 1TB, because NixOS (which nearly everybody at the company uses) uses a lot of diskspace.

Yeah I'm planning to do that as well :stuck_out_tongue:

Got the GTK app working ! But it's a bit ugly :stuck_out_tongue:
image.png

Wonder if the problem is in my end

Oh yea, that looks weird. Looks like semantic UI CSS is not loading?

Expected layout: https://www.srid.ca/ka.html

@Bolt Is this on macOS?

Arch

Can you send the full app screenshot? Also logs.

src/Ka/View.hs line 27; that's where semantic UI css is getting included.

Okay I have an idea.

Right click inside the app, and click "Inspect Element". This will open a DOM inspector

image.png
image.png

I have the DOM inspector opened

In the Network tab, select "All" and you should see the status of semantic.min.css

On my end it looks like this:
image.png

There's an error loading that resource!

Why is it failing? can you fix that?

Let me see

I found the source of the error

Failed to load resource: TLS/SSL support not available; install glib-networking

maybe some dependency issue

Output of ldd $(nix-build)/bin/ka?

In theory nix should have taken care of it; if it works on NixOS, why does it not work on Arch? Or is nixpkgs doing some conditional stuff, depending on linux distro? No idea...

ldd.txt

Doesn't seem to to be there

Is glib-networking listed on the dependencies?

I do have it installed on my system tho

is glib-networking running as a service (systemd)?

I don't think so, probably

it seems to be a library, and a service. cf. https://github.com/NixOS/nixpkgs/blob/7f6dda737a11165c71128f46c631b3cd4dfadbda/nixos/modules/services/desktops/gnome3/glib-networking.nix#L17

Is glib-networking on the input build of the derivation?

@Bolt Looks like you hit this bug: https://github.com/reflex-frp/reflex-dom/pull/80

Maybe we can get glib-networking into reflex-platform to fix this?

Weird

Is that a hard thing to do?

@Bolt I have no idea. We don't have to touch reflex-platform (ka doedsn't use it); just nixpkgs. So maybe we need to see how reflex-dom is packaged up in nixpkgs, and change there. You can check with @maralorn as he might have some ideas.