feat: disk space monitor with desktop notifications + waybar indicator

Adds a disk monitor script that warns via notify-send (swaync) when disk
usage exceeds 85% (warning) or 92% (critical), and shows a color-coded
indicator in the waybar.

Changes:
- waybar/scripts/disk-monitor.sh — monitoring script with 3 modes:
  * daemon: background check every 5 min, sends desktop notifications
  * waybar: one-shot JSON for waybar custom module
  * check: single check for manual use
- hyprland.conf — exec-once for daemon mode (runs on login)
- config.jsonc — added custom/disk-monitor to modules-right
- modules.json — custom module definition (60s refresh, color-coded)
- style.css — normal/warning/critical styles with blink animation

Usage:
  Normal: shows 💾 / 45% (green)
  Warning: 🟡 / 85% (orange)
  Critical: 🔴 / 92% (red, blinking)

hypr/.config/hypr/hyprland.conf

@@ -73,6 +73,7 @@ exec-once = swww img ~/.config/wallpapers/green_yellow_forest.jpg --outputs $EXT
 exec-once = swww img ~/.config/wallpapers/buck_head.jpg --outputs $EXTERNAL_R1
 exec-once = swww img ~/.config/wallpapers/buck_head.jpg --outputs $EXTERNAL_R2
 exec-once = swaync
+exec-once = ~/.config/waybar/scripts/disk-monitor.sh daemon
 exec-once = hypridle
 exec-once = hyprlock
 exec-once = /usr/bin/emacs --daemon

waybar/.config/waybar/config.jsonc

@@ -25,6 +25,7 @@
         
        "modules-right": [
            "group/hardware",
+           "custom/disk-monitor",
            "pulseaudio",
            "bluetooth",
            "network",

waybar/.config/waybar/modules.json

@@ -158,4 +158,12 @@
 		"on-click": "wlogout -b 2",
 		"tooltip": false		
 	},
+
+	// disk space monitor (background daemon for notifications)
+	"custom/disk-monitor": {
+		"exec": "~/.config/waybar/scripts/disk-monitor.sh waybar",
+		"return-type": "json",
+		"interval": 60,
+		"signal": 8
+	}
 }

waybar/.config/waybar/scripts/disk-monitor.sh

@@ -0,0 +1,119 @@
+#!/usr/bin/env bash
+# Disk Space Monitor — warns you before you hit the wall.
+#
+# Two integration points:
+#  1. Waybar: add "custom/disk" to modules-right in config.jsonc
+#  2. Hyprland: add exec-once = ... disk-monitor.sh daemon
+#
+# Install:
+#   cp disk-monitor.sh ~/.config/waybar/scripts/
+#   chmod +x ~/.config/waybar/scripts/disk-monitor.sh
+
+set -euo pipefail
+
+WARN_PCT=85
+CRIT_PCT=92
+
+# ─── helpers ────────────────────────────────────────────────────────────────
+
+_notify() {
+  local urgency="$1" title="$2" body="$3"
+  notify-send -u "$urgency" -a "disk-monitor" "$title" "$body"
+}
+
+# ─── commands ───────────────────────────────────────────────────────────────
+
+cmd_check() {
+  local alerts=""
+  local any_alert=false
+
+  while IFS= read -r line; do
+    # Skip headers and pseudo-filesystems
+    target=$(echo "$line" | awk '{print $1}')
+    pct=$(echo "$line" | awk '{print $2}' | tr -d '%')
+    used=$(echo "$line" | awk '{print $3}')
+    size=$(echo "$line" | awk '{print $4}')
+    avail=$(echo "$line" | awk '{print $5}')
+
+    case "$target" in
+      /dev|/sys|/proc|/run|tmpfs|devtmpfs|none|udev|overlay|shm|devpts|mqueue|pts) continue ;;
+      /boot*) continue ;;
+      *) ;;
+    esac
+
+    if [ "$pct" -ge "$CRIT_PCT" ]; then
+      any_alert=true
+      alerts+="🔴 $target  ${pct}%  (${avail} free)\n"
+    elif [ "$pct" -ge "$WARN_PCT" ]; then
+      any_alert=true
+      alerts+="🟡 $target  ${pct}%  (${avail} free)\n"
+    fi
+  done < <(df -h --output=target,pcent,used,size,avail | tail -n +2)
+
+  if [ -z "$alerts" ]; then
+    return 0
+  fi
+  if echo "$alerts" | grep -q "🔴"; then
+    _notify critical "🚨 Disk CRITICAL" "$alerts"
+  else
+    _notify normal "⚠️  Disk space low" "$alerts"
+  fi
+}
+
+cmd_daemon() {
+  local interval="${1:-300}"
+  echo "disk-monitor: checking every ${interval}s, warn@${WARN_PCT}% crit@${CRIT_PCT}%"
+  cmd_check
+  while true; do
+    sleep "$interval"
+    cmd_check
+  done
+}
+
+cmd_waybar() {
+  local worst_pct=0
+  local worst_target="/"
+  local tooltip=""
+
+  while IFS= read -r line; do
+    target=$(echo "$line" | awk '{print $1}')
+    pct=$(echo "$line" | awk '{print $2}' | tr -d '%')
+    used=$(echo "$line" | awk '{print $3}')
+    size=$(echo "$line" | awk '{print $4}')
+    avail=$(echo "$line" | awk '{print $5}')
+
+    case "$target" in
+      /dev|/sys|/proc|/run|tmpfs|devtmpfs|none|udev|overlay|shm|devpts|mqueue|pts) continue ;;
+      /boot*) continue ;;
+      *) ;;
+    esac
+
+    tooltip+="${target}: ${pct}% (${avail} free)\\n"
+    [ "$pct" -gt "$worst_pct" ] && { worst_pct=$pct; worst_target=$target; }
+  done < <(df -h --output=target,pcent,used,size,avail | tail -n +2)
+
+  local icon class
+  if [ "$worst_pct" -ge "$CRIT_PCT" ]; then
+    icon="🔴"; class="critical"
+  elif [ "$worst_pct" -ge "$WARN_PCT" ]; then
+    icon="🟡"; class="warning"
+  else
+    icon="💾"; class="normal"
+  fi
+
+  printf '{"text": " %s %s %d%% ", "tooltip": "%s", "class": "%s"}\n' \
+    "$icon" "$worst_target" "$worst_pct" "$tooltip" "$class"
+}
+
+case "${1:-help}" in
+  daemon)     cmd_daemon "${2:-300}" ;;
+  waybar|w)   cmd_waybar ;;
+  check|notify) cmd_check ;;
+  *)
+    echo "Usage: $(basename "$0") {daemon|waybar|check}"
+    echo "  daemon        Background check every 5 min, desktop notifications"
+    echo "  waybar        One-shot JSON for Waybar custom module"
+    echo "  check         Single check, prints to stdout"
+    exit 1
+    ;;
+esac

waybar/.config/waybar/style.css

@@ -213,6 +213,28 @@ tooltip label {
 }
 
 /* custom modules */
+#custom-disk-monitor {
+    margin: 0px 0px 0px 5px;
+    padding: 1px 8px 0px 8px;
+    font-size: 16px;
+    color: @text;
+    border-radius: 5px;
+    background-color: @set;
+}
+#custom-disk-monitor.warning {
+    background-color: #ff9a3c;
+    color: #FFFFFF;
+}
+#custom-disk-monitor.critical {
+    background-color: #dc2f2f;
+    color: #FFFFFF;
+    animation-name: blink;
+    animation-duration: 0.5s;
+    animation-timing-function: linear;
+    animation-iteration-count: infinite;
+    animation-direction: alternate;
+}
+
 #custom-exit {
     margin: 0px 18px 0px 5px;
     padding: 0px;