add systemd service

[jtheoof]

Not all sway users rely on the "flaky" exec_always in the sway config.

For example if the app crashes (like it currently does on my machine
after a suspend / resume), then nwg-panel is terminated and never
comes back.

For users using sway-service
this would be a nice addition.

Also this is the required change in the PKGBUILD

diff --git a/PKGBUILD b/PKGBUILD
index 26c5832..f698201 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -20,4 +20,5 @@ package() {
   install -D -t "$pkgdir"/usr/share/pixmaps nwg-panel.svg
   install -D -t "$pkgdir"/usr/share/pixmaps nwg-shell.svg
   install -D -t "$pkgdir"/usr/share/applications nwg-panel-config.desktop
+  install -D -t "$pkgdir"/usr/lib/systemd/user/ nwg-panel.service
 }

[jtheoof]

Please note that this was heavily inspired from mako's service file.

[nwg-piotr]

Interesting, thank you. Let me get back to it over the weekend, as we're busy with an urgent job ab the moment.

[jtheoof]

Also note that it would be nice to update the wiki after that, but I cannot put it inside this MR.

[nwg-piotr]

This will also require changes in nwg-shell-config, so can not be done immediately.

[nwg-piotr]

Is sway-services necessary to start nwg-panel.service? I tried just copying your file to /usr/lib/systemd/user/ and ended up in:

$ systemctl enable nwg-panel.service
Failed to enable unit: Unit file nwg-panel.service does not exist.

[jtheoof]

This is a user service. You need to enable it via systemctl --user enable nwg-panel.service -> This should go to the wiki.

[nwg-piotr]

Ah, all right. This will be useful for standalone use of panel only. Switching nwg-shell presets requires re-launching nwg-panel with different arguments.

[jtheoof]

Yes and it's fully opt-in. Users don't need to use this if they don't want to. I haven't played around with nwg-shell yet. Taking it step by step but looks like a cool project. If I see other tools could benefit from better systemd integration I'll try to contribute.

[nwg-piotr]

You've already contributed, as the shell uses swappy by default. Many thanks!