How to run a script when viewport changes?

[vdegenne]

I have a viewport with my IDE open and on the viewport on the right I have the browser, when I change a file and save the browser updates.
I made a script to save the file in nvim, now I just need to execute it when the viewport change so I wouldn't have to press ctrl+s to save every time I want to see the changes.

What would be the best way of detecting viewport changes in wayfire?

The only thing I can think of right now is using IPC but I'm trying to find out if there is an easier way to do that.

Thanks for your help

[soreau]

IPC is probably the best way to go, especially if you're using latest wayfire. You can use sock.watch["wset-workspace-changed"] to receive this data set. For this to work, you will need to enable ipc and ipc-rules plugins, and install pywayfire with python pip. The other way is to write a wayfire plugin which calls wf::get_core().run(cmd); when it gets the wf::workspace_changed_signal signal internally.

[soreau]

As I said, you will need to install pywayfire with python pip.

[vdegenne]

Nice thanks! Btw I don't think that's a good solution because when i go on the right and back on left it will execute the script twice, eventually leading to glitches.
One better solution would be to detect when tmux is losing focus, I don't know if IPC can go that deep.
I could also always stick to a viewport for my IDE and use the data from the message to avoid saving when my IDE gains focus again, but sometimes I have multiple IDE open on different viewports so it can get a little tricky.

[soreau]

You should be able to check "new_workspace" auxiliary data, and make sure it's the workspace you want before running the command.

[soreau]

To check for view focus lost, you can watch for "view-focused" event, and record the view app-id. If the last app-id was tmux and the current is not, run the command.

[vdegenne]

Awesome thanks a lot. Here's the final script:

from wayfire import WayfireSocket
import subprocess

TARGET_WINDOW = "Alacritty"

events_sock = WayfireSocket()
events_sock.watch(["view-focused"])

last_window = None

while True:
    msg = events_sock.read_message()

    if msg["view"] is not None:
        current_window = msg["view"]["app-id"]

        if last_window == TARGET_WINDOW:
            subprocess.run(
                ['$HOME/.config/tmux/tmux-save-nvim.sh'], shell=True)

        last_window = current_window