feat(sway-desktop): set up for screensharing of headless outputs

nix/home-manager/profiles/sway-desktop.nix

@@ -1,3 +1,20 @@
+/*
+TODO: create helper scripts for sharing of a screen portion
+```
+
+# this will create a new output named HEADLESS-<n>. <n> increments by 1 with each invocation even if the output is `unplug`ged.
+swaymsg create_output
+
+# find the name and the workspace number
+swaymsg -t get_outputs | jq '.[] | select(.name | test("HEADLESS-.*")) | (.name, .current_workspace)'
+
+swaymsg output HEADLESS-1 mode 1920@108060Hz
+
+# mirror the headless workspace on the current one
+nix run nixpkgs\#wl-mirror -- HEADLESS-1
+
+# shift windows to the workspace and switch the focus to it
+*/
 {
   pkgs,
   config,

nix/home-manager/programs/waybar.nix

@@ -22,7 +22,14 @@
         layer = "top";
         position = "bottom";
         height = 30;
-        output = ["*"];
+        output =
+          # hide the bar on HEADDLESS displays as i use them only for screensharing
+          (
+            builtins.genList (i: "!HEADLESS-${builtins.toString i}") 99
+          )
+          ++ [
+            "*"
+          ];
         # output = [
         #   "eDP-1"
         #   "DP-*"

nix/os/snippets/sway-desktop.nix

@@ -40,6 +40,25 @@ in {
 
     wlr = {
       enable = true;
+      settings = {
+        screencast = {
+          chooser_type = "dmenu";
+          # display the output as a list in favor of the default mouse selection
+          chooser_cmd = lib.getExe (pkgs.writeShellApplication {
+            name = "chooser_cmd";
+            runtimeInputs = [
+              pkgs.sway
+              pkgs.jq
+              pkgs.fuzzel
+              pkgs.gnused
+            ];
+            text = ''
+              swaymsg -t get_outputs | jq '.[] | "\(.name)@\(.current_mode.width)x\(.current_mode.height) on \(.model)"' | sed 's/"//g' | fuzzel -d | sed 's/@.*//'
+            '';
+          });
+          max_fps = 30;
+        };
+      };
     };
 
     # keep the behaviour in < 1.17, which uses the first portal implementation found in lexicographical order, use the following: