hyprlock: use UptimeNixOS script to get the output if uptime -p not available

config/hypr/hyprlock.conf

@@ -4,6 +4,7 @@
 
 # Sourcing colors generated by wallust
 source = $HOME/.config/hypr/wallust/wallust-hyprland.conf
+$Scripts = $HOME/.config/hypr/scripts
 
 general {
     grace = 1
@@ -99,7 +100,7 @@ label {
 # uptime
 label {
     monitor =
-    text = cmd[update:60000] echo "<b> "$(uptime -p)" </b>"
+    text = cmd[update:60000] echo "<b> "$(uptime -p || $Scripts/UptimeNixOS.sh)" </b>"
     color = $color12
     font_size = 24
     font_family = JetBrains Mono Nerd Font 10

config/hypr/scripts/UptimeNixOS.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+# Script parses /proc/uptime to get the system uptime
+# and prints it in a human-readable format
+# This is a workaround for system where `uptime` command is taken from coreutils
+# where `uptime -p` is not supported
+
+if [[ -r /proc/uptime ]]; then
+    s=$(< /proc/uptime)
+    s=${s/.*}
+else
+    echo "Error UptimeNixOS.sh: Uptime could not be determined." >&2
+    exit 1
+fi
+
+d="$((s / 60 / 60 / 24)) days"
+h="$((s / 60 / 60 % 24)) hours"
+m="$((s / 60 % 60)) minutes"
+
+# Remove plural if < 2.
+((${d/ *} == 1)) && d=${d/s}
+((${h/ *} == 1)) && h=${h/s}
+((${m/ *} == 1)) && m=${m/s}
+
+# Hide empty fields.
+((${d/ *} == 0)) && unset d
+((${h/ *} == 0)) && unset h
+((${m/ *} == 0)) && unset m
+
+uptime=${d:+$d, }${h:+$h, }$m
+uptime=${uptime%', '}
+uptime=${uptime:-$s seconds}
+
+echo "up $uptime"