Add timer script

Based on
6b71b580de/bin/timer
and
6b71b580de/bin/_timer.

home-manager/opdavies/t480.nix

@@ -105,6 +105,7 @@
     move-firefox-screenshots
     setbg
     tag-release
+    timer
     todos-add
     unmounter
     update-all-git-repos

packages/_timer.nix

@@ -0,0 +1,19 @@
+{ pkgs }:
+
+pkgs.writeShellApplication {
+  name = "_timer";
+
+  runtimeInputs = with pkgs; [
+    coreutils
+    libnotify
+  ];
+
+  text = ''
+    mins=$1
+    message=''${2:-Time out!}
+
+    sleep $((mins * 60))
+
+    notify-send -t 0 "''${message}" "Your timer of $mins min is over" -u normal
+  '';
+}

packages/default.nix

@@ -6,6 +6,7 @@ let
   vimPlugins = callPackage ./vim-plugins { };
 in
 {
+  _timer = callPackage ./_timer.nix { };
   backup-websites = callPackage ./backup-websites.nix { };
   build-glove80 = callPackage ./build-glove80.nix { };
   create-script = callPackage ./create-script.nix { };
@@ -17,6 +18,7 @@ in
   passmenu-otp = callPackage ./passmenu-otp.nix { };
   setbg = callPackage ./setbg.nix { };
   tag-release = callPackage ./tag-release.nix { };
+  timer = callPackage ./timer.nix { };
   tmux-sessionizer = callPackage ./tmux-sessionizer { };
   todos-add = callPackage ./todos-add.nix { };
   unmounter = callPackage ./unmounter.nix { };

packages/timer.nix

@@ -0,0 +1,21 @@
+{ pkgs }:
+
+pkgs.writeShellApplication {
+  name = "timer";
+
+  runtimeInputs = with pkgs; [
+    _timer
+    coreutils
+    systemdMinimal
+  ];
+
+  text = ''
+    mins=$1
+    message="''${2:-}"
+
+    nohup _timer "$mins" "$message" &> /dev/null &
+
+    echo "timer started for $mins min"
+    echo "timer started for $mins min, message: '$message'" | systemd-cat -t timer
+  '';
+}