From 3ba1690e3a0ab555d8075e984a1750cb692764a8 Mon Sep 17 00:00:00 2001
From: Swarsel <leon.schwarzaeugl@gmail.com>
Date: Sun, 15 Dec 2024 15:00:44 +0100
Subject: [PATCH] feat: add low battery indicator

---
 SwarselSystems.org                   | 41 ++++++++++++++++++++++++++++
 profiles/common/nixos/default.nix    |  1 +
 profiles/common/nixos/lowbattery.nix | 26 ++++++++++++++++++
 profiles/common/nixos/packages.nix   |  4 +++
 4 files changed, 72 insertions(+)
 create mode 100644 profiles/common/nixos/lowbattery.nix

diff --git a/SwarselSystems.org b/SwarselSystems.org
index 5778d1b..07cdef4 100644
--- a/SwarselSystems.org
+++ b/SwarselSystems.org
@@ -3062,6 +3062,7 @@ This section is for setting things that should be used on hosts that are using t
       # ./safeeyes.nix
       ./distrobox.nix
       ./lid.nix
+      ./lowbattery.nix
     ];
 
     nixpkgs.config.permittedInsecurePackages = [
@@ -3149,8 +3150,12 @@ Mostly used to install some compilers and lsp's that I want to have available wh
       # secure boot
       sbctl
 
+      # nix package database
       nix-index
 
+      # proc info
+      acpi
+
       # better make for general tasks
       just
 
@@ -4570,6 +4575,42 @@ This turns off the display when the lid is closed.
   }
 #+end_src
 
+**** Low battery notification
+:PROPERTIES:
+:CUSTOM_ID: h:adf894d7-b3c6-4b8b-b13f-c28b3a5e1e17
+:END:
+
+Since I hide the waybar completely during normal operation, I run the risk of not noticing when my battery is about to run out. This module sends a notification when the battery level falls below 10%. Written by [[https://gist.github.com/cafkafk][cafkafk]].
+
+#+begin_src nix :tangle profiles/common/nixos/lowbattery.nix
+  { pkgs, lib, ... }:
+  {
+    systemd.user.services."battery-low" = {
+      enable = true;
+      description = "Notify user if battery is below 10%";
+      partOf = [ "graphical-session.target" ];
+      wantedBy = [ "graphical-session.target" ];
+      serviceConfig = {
+        Type = "simple";
+        ExecStart = pkgs.writeShellScript "battery-low-notification"
+          ''
+            if (( 10 >= $(${lib.getExe pkgs.acpi} -b | head -n 1 | ${lib.getExe pkgs.ripgrep} -o "\d+%" | ${lib.getExe pkgs.ripgrep} -o "\d+")));
+            then ${lib.getExe pkgs.libnotify} --urgency=critical "low battery" "$(${lib.getExe pkgs.acpi} -b | head -n 1 | ${lib.getExe pkgs.ripgrep} -o "\d+%")";
+            fi;
+          '';
+      };
+    };
+    systemd.user.timers."battery-low" = {
+      wantedBy = [ "timers.target" ];
+      timerConfig = {
+        # Every Minute
+        OnCalendar = "*-*-* *:*:00";
+        Unit = "battery-low.service";
+      };
+    };
+  }
+#+end_src
+
 *** Server
 :PROPERTIES:
 :CUSTOM_ID: h:e492c24a-83a0-4bcb-a084-706f49318651
diff --git a/profiles/common/nixos/default.nix b/profiles/common/nixos/default.nix
index 4d034af..05e8540 100644
--- a/profiles/common/nixos/default.nix
+++ b/profiles/common/nixos/default.nix
@@ -38,6 +38,7 @@ _:
     # ./safeeyes.nix
     ./distrobox.nix
     ./lid.nix
+    ./lowbattery.nix
   ];
 
   nixpkgs.config.permittedInsecurePackages = [
diff --git a/profiles/common/nixos/lowbattery.nix b/profiles/common/nixos/lowbattery.nix
new file mode 100644
index 0000000..3c41b4f
--- /dev/null
+++ b/profiles/common/nixos/lowbattery.nix
@@ -0,0 +1,26 @@
+{ pkgs, lib, ... }:
+{
+  systemd.user.services."battery-low" = {
+    enable = true;
+    description = "Notify user if battery is below 10%";
+    partOf = [ "graphical-session.target" ];
+    wantedBy = [ "graphical-session.target" ];
+    serviceConfig = {
+      Type = "simple";
+      ExecStart = pkgs.writeShellScript "battery-low-notification"
+        ''
+          if (( 10 >= $(${lib.getExe pkgs.acpi} -b | head -n 1 | ${lib.getExe pkgs.ripgrep} -o "\d+%" | ${lib.getExe pkgs.ripgrep} -o "\d+")));
+          then ${lib.getExe pkgs.libnotify} --urgency=critical "low battery" "$(${lib.getExe pkgs.acpi} -b | head -n 1 | ${lib.getExe pkgs.ripgrep} -o "\d+%")";
+          fi;
+        '';
+    };
+  };
+  systemd.user.timers."battery-low" = {
+    wantedBy = [ "timers.target" ];
+    timerConfig = {
+      # Every Minute
+      OnCalendar = "*-*-* *:*:00";
+      Unit = "battery-low.service";
+    };
+  };
+}
diff --git a/profiles/common/nixos/packages.nix b/profiles/common/nixos/packages.nix
index f09506d..127eebd 100644
--- a/profiles/common/nixos/packages.nix
+++ b/profiles/common/nixos/packages.nix
@@ -26,8 +26,12 @@
     # secure boot
     sbctl
 
+    # nix package database
     nix-index
 
+    # proc info
+    acpi
+
     # better make for general tasks
     just