add: external monitor brightness module

3 files changed, 82 insertions, 2 deletions

diff --git a/waybar/brightness b/waybar/brightness
new file mode 100755
index 0000000..138f5ee
--- /dev/null
+++ b/waybar/brightness
@@ -0,0 +1,69 @@
+#!/usr/bin/env bash
+
+# --- CONFIGURATION ---
+DISPLAY_NUM=1
+STEP=5
+STATE_FILE="/tmp/waybar_brightness.tmp"
+# ---------------------
+
+# Function to send the actual DDC/CI command in the background
+set_brightness_in_background() {
+  pkill -f "ddcutil.*setvcp 10"
+  (ddcutil --display $DISPLAY_NUM setvcp 10 $1) &
+}
+
+# Ensure state file exists, or create it by querying the monitor
+if [ ! -f "$STATE_FILE" ]; then
+  # ddcutil terse output format: "VCP 10 C <current> <max>"
+  initial_brightness=$(ddcutil --display $DISPLAY_NUM getvcp 10 -t 2>/dev/null | awk '{print $4}')
+  # Fallback to 50 if ddcutil fails or returns non-numeric
+  if ! [[ "$initial_brightness" =~ ^[0-9]+$ ]]; then
+    initial_brightness=50
+  fi
+  echo "$initial_brightness" >"$STATE_FILE"
+fi
+
+current=$(cat "$STATE_FILE")
+# Validate current is a number, fallback to 50 if corrupted
+if ! [[ "$current" =~ ^[0-9]+$ ]]; then
+  current=50
+  echo "$current" >"$STATE_FILE"
+fi
+
+case "$1" in
+"get")
+  echo "$current"
+  ;;
+"up")
+  new_brightness=$((current + STEP > 100 ? 100 : current + STEP))
+  if [ "$current" -ne "$new_brightness" ]; then
+    echo "$new_brightness" >"$STATE_FILE"
+    set_brightness_in_background "$new_brightness"
+  fi
+  pkill -RTMIN+9 waybar # Can add whatever RTMIN+n you please, as long as it's an integer. Make sure the signals match between the config and script.
+  ;;
+"down")
+  new_brightness=$((current - STEP < 0 ? 0 : current - STEP))
+  if [ "$current" -ne "$new_brightness" ]; then
+    echo "$new_brightness" >"$STATE_FILE"
+    set_brightness_in_background "$new_brightness"
+  fi
+  pkill -RTMIN+9 waybar
+  ;;
+"right_click")
+  new_brightness=0
+  if [ "$current" -ne "$new_brightness" ]; then
+    echo "$new_brightness" >"$STATE_FILE"
+    set_brightness_in_background "$new_brightness"
+  fi
+  pkill -RTMIN+9 waybar
+  ;;
+"left_click")
+  new_brightness=100
+  if [ "$current" -ne "$new_brightness" ]; then
+    echo "$new_brightness" >"$STATE_FILE"
+    set_brightness_in_background "$new_brightness"
+  fi
+  pkill -RTMIN+9 waybar
+  ;;
+esac
diff --git a/waybar/config.jsonc b/waybar/config.jsonc
index fd82389..1583fe5 100644
--- a/waybar/config.jsonc
+++ b/waybar/config.jsonc
@@ -10,6 +10,7 @@
 	],
 	"modules-right": [
 		"tray",
+		"custom/brightness",
 		"network",
 		"pulseaudio",
 		"bluetooth",
@@ -66,8 +67,6 @@
 			"alsa_output.pci-0000_00_1f.3.analog-stereo": "",
 			"alsa_output.pci-0000_00_1f.3.analog-stereo-muted": "",
 			"headphone": "",
-			"hands-free": "",
-			"headset": "",
 			"phone": "",
 			"phone-muted": "",
 			"portable": "",
@@ -100,5 +99,16 @@
 		"exec": "~/.config/waybar/niri-workspaces",
 		"return-type": "json",
 		"format": "{}"
+	},
+	"custom/brightness": {
+		"format": "☀ {}%",
+		"tooltip-format": "EXT: ☀ {}%",
+		"interval": "once",
+		"signal": 9,
+		"exec": "~/.config/waybar/brightness get",
+		"on-scroll-up": "~/.config/waybar/brightness up",
+		"on-scroll-down": "~/.config/waybar/brightness down",
+		"on-click": "~/.config/waybar/brightness left_click",
+		"on-click-right": "~/.config/waybar/brightness right_click"
 	}
 }
diff --git a/waybar/style.css b/waybar/style.css
index 6590d83..f6734ca 100644
--- a/waybar/style.css
+++ b/waybar/style.css
@@ -18,6 +18,7 @@ window#waybar {
 #clock,
 #battery,
 #window,
+#custom-brightness,
 #memory,
 #network,
 #mpris,