nixos/modules/services/remEYEnder/default.nix

@@ -2,8 +2,6 @@
 
 let
   cfg = config.sisyphus.services.remEYEnder;
-
-  icon = ./vecteezy_eyes-line-icon-vector-isolated_13932670.jpg;
 in {
   options.sisyphus.services.remEYEnder.enable = lib.mkEnableOption "Eye reminder";
 
@@ -13,10 +11,10 @@ in {
         enable = true;
         description = "Send an eye reminder";
         serviceConfig.Type = "oneshot";
-        script = ''
-          # Display reminder for 20 seconds.
-          ${pkgs.libnotify}/bin/notify-send -t 20000 --icon=${icon} "RemEYEnder" "Look away from your screen :)"
-        '';
+        script = builtins.readFile ./remEYEnder.sh;
+        path = with pkgs; [
+          libnotify
+        ];
       };
       timers.remEYEnder = {
         enable = true;

nixos/modules/services/remEYEnder/remEYEnder.sh

@@ -0,0 +1 @@
+../../../../scripts/remEYEnder.sh

scripts/remEYEnder.sh

@@ -0,0 +1,30 @@
+DURATION=20 # How long it takes to progress the bar fully
+STEPS=100   # In how many steps to progress (> 0)
+
+# Trick to fake decimals
+EXP=3
+interval_ms="$(( "${DURATION}" * ( 10 ** "${EXP}" ) / "${STEPS}" ))"
+padded_interval_ms="$(printf "%0${EXP}d" "${interval_ms}")"
+interval_s="${padded_interval_ms:0:-${EXP}}.${padded_interval_ms:-${EXP}}"
+
+end_time="$(( "$( date '+%s' )" + "${DURATION}" + 1 ))"
+
+# notify-send args
+replace_id="${end_time}"
+expire_time="$(( "${interval_ms}" + 1 ))" # To avoid flickering
+
+counter=0
+while [[ "${end_time}" -gt "$( date '+%s' )" ]]; do
+    # Remap to [0, 100]
+    remaining_part="$(( ("${STEPS}" - "${counter}") * 100 / "${STEPS}" ))"
+
+    notify-send \
+        'Look away from your screen :)' 'RemEYEnder' \
+        --hint="int:value:${remaining_part}" \
+        --category='sysinfo' \
+        --replace-id="${replace_id}" \
+        --expire-time="${expire_time}"
+
+    counter="$(( "${counter}" + 1 ))"
+    sleep "${interval_s}"
+done