dell

modules/misc/tv-on-off.nix

@@ -0,0 +1,38 @@
+{ pkgs, lib, ... }:
+let
+  cec = "${pkgs.v4l-utils}/bin/cec-ctl";
+
+  tvOn = pkgs.writeShellScriptBin "tvOn" ''
+    if [ $(${cec} -A | ${pkgs.gnugrep}/bin/grep cec0 | ${pkgs.coreutils}/bin/wc -l) -gt 0 ]; then
+      ${cec} --tv --skip-info
+      ${cec} --skip-info --user-control-pressed ui-cmd=power-on-function --to TV
+      echo "Turning TV on!"
+    fi
+  '';
+  tvOff = pkgs.writeShellScriptBin "tvOff" ''
+    if [ $(${cec} -A | ${pkgs.gnugrep}/bin/grep cec0 | ${pkgs.coreutils}/bin/wc -l) -gt 0 ]; then
+      ${cec} --tv --skip-info
+      ${cec} --skip-info --user-control-pressed ui-cmd=power-on-function --to TV
+      echo "Turning TV on!"
+    fi
+  '';
+in
+{
+  environment.systemPackages = with pkgs; [
+    tvOff
+    tvOn
+  ];
+  # after suspend, do `cec-ctl -A | grep cec0 | wc -l`, if >0, do `cec-ctl --standby --to TV`
+  # similar on wakeup, if present send `cec-ctl --user-control-pressed ui-cmd=power-on-function --to TV`
+  environment.etc."systemd/system-sleep/sleep-turn-tv-off-on.sh".source =
+    pkgs.writeShellScript "post-sleep-turn-tv-off.sh" ''
+      case $1/$2 in
+        pre/*)
+          ${tvOff}
+          ;;
+        post/*)
+          ${tvOn}
+          ;;
+      esac
+    '';
+}