From 662cf77b2194e9c2afbd0d978b770394f257a0b4 Mon Sep 17 00:00:00 2001
From: Antoine Martin <antoine@alarsyo.net>
Date: Tue, 6 Feb 2024 17:07:41 +0100
Subject: [PATCH] hephaestus: add lid-listener service for autorandr

---
 hosts/hephaestus/default.nix | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/hosts/hephaestus/default.nix b/hosts/hephaestus/default.nix
index 0a0f3bc..deb7cde 100644
--- a/hosts/hephaestus/default.nix
+++ b/hosts/hephaestus/default.nix
@@ -213,6 +213,29 @@
     };
   };
 
+  systemd.services.autorandr-lid-listener = {
+    wantedBy = ["multi-user.target"];
+    description = "Listening for lid events to invoke autorandr";
+
+    serviceConfig = {
+      Type = "simple";
+      ExecStart = let
+        stdbufExe = lib.getExe' pkgs.coreutils "stdbuf";
+        libinputExe = lib.getExe' pkgs.libinput "libinput";
+        grepExe = lib.getExe pkgs.gnugrep;
+        autorandrExe = lib.getExe pkgs.autorandr;
+      in pkgs.writeShellScript "lid-listener.sh" ''
+        ${stdbufExe} -oL ${libinputExe} debug-events |
+          ${grepExe} -E --line-buffered '^[[:space:]-]+event[0-9]+[[:space:]]+SWITCH_TOGGLE[[:space:]]' |
+          while read line; do
+            ${pkgs.systemd}/bin/systemctl start --no-block autorandr.service
+          done
+      '';
+      Restart = "always";
+      RestartSec = "30";
+    };
+  };
+
   # Configure console keymap
   console.keyMap = "us";