From 70829a0af6e4eb428acfe112fe51a09da3ec3291 Mon Sep 17 00:00:00 2001
From: sinanmohd <sinan@sinanmohd.com>
Date: Fri, 30 Aug 2024 17:57:55 +0530
Subject: common: hibernate on critical battery level

---
 os/common/configuration.nix |  8 +++++++-
 os/pc/modules/wayland.nix   | 26 +++++++++++++++++++++++++-
 2 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/os/common/configuration.nix b/os/common/configuration.nix
index 047b153..8026b9f 100644
--- a/os/common/configuration.nix
+++ b/os/common/configuration.nix
@@ -1,4 +1,4 @@
-{ config, lib, ... }: let
+{ config, pkgs, lib, ... }: let
   host = config.networking.hostName;
 in {
   disabledModules = [
@@ -23,6 +23,12 @@ in {
     size = 2048; # 2GB
   }];
 
+  services.udev.extraRules = let
+    cmd = "${pkgs.systemd}/bin/systemctl hibernate";
+  in ''
+    SUBSYSTEM=="power_supply", ATTR{status}=="Discharging", ATTR{capacity}=="[0-5]", RUN+="${cmd}"
+  '';
+
   sops = {
     defaultSopsFile = ../${host}/secrets.yaml;
     age.keyFile = "/var/secrets/${host}.sops";
diff --git a/os/pc/modules/wayland.nix b/os/pc/modules/wayland.nix
index 7380e71..33f25c8 100644
--- a/os/pc/modules/wayland.nix
+++ b/os/pc/modules/wayland.nix
@@ -1,4 +1,4 @@
-{ config, ... }: let
+{ config, pkgs, ... }: let
   user = config.global.userdata.name;
 
   fontSans = config.global.font.sans.name;
@@ -31,6 +31,30 @@ in {
     };
   };
 
+  systemd.services.swaynag_battery = {
+    path = [ pkgs.sway pkgs.systemd ];
+    environment = {
+      # TODO: don't hardcode them
+      WAYLAND_DISPLAY = "wayland-1";
+      XDG_RUNTIME_DIR = "/run/user/1000";
+    };
+    script = ''
+      swaynag \
+          -m '󰂃  Critical battery level, system hibernation imminent, please connect to a power source' \
+          --layer  overlay \
+          --dismiss-button  'Hibernate now' &&
+      systemctl hibernate
+    '';
+  };
+  services.udev.extraRules = let
+    start = "${pkgs.systemd}/bin/systemctl start swaynag_battery";
+    stop = "${pkgs.systemd}/bin/systemctl stop swaynag_battery";
+  in ''
+    SUBSYSTEM=="power_supply", ATTR{status}=="Discharging", ATTR{capacity}=="[0-9]", RUN+="${start}"
+    SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_ONLINE}=="1", RUN+="${stop}"
+    SUBSYSTEM=="power_supply", ATTR{status}=="Charging", RUN+="${stop}"
+  '';
+
   hardware.graphics = {
     enable = true;
     enable32Bit = true;
-- 
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