nixos config

modules/scripts/brightness-ctl.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+# Brightness control abstraction: prefers the kernel backlight class (laptop
+# panels, via brightnessctl); falls back to DDC/CI over I2C (external
+# monitors, via ddcutil) when no backlight device exists. Keeps the rest of
+# the config (Quickshell's brightness popup) hardware-agnostic.
+set -euo pipefail
+
+has_backlight() {
+    [ -n "$(ls -A /sys/class/backlight 2>/dev/null)" ]
+}
+
+case "${1:-get}" in
+    get)
+        if has_backlight; then
+            brightnessctl -m | cut -d, -f4 | tr -d '%'
+        else
+            ddcutil getvcp 10 --brief 2>/dev/null | awk '{print $4}'
+        fi
+        ;;
+    set)
+        pct="${2:?usage: brightness-ctl set <0-100>}"
+        if has_backlight; then
+            brightnessctl set "${pct}%" > /dev/null
+        else
+            ddcutil setvcp 10 "$pct" > /dev/null
+        fi
+        ;;
+    *)
+        echo "usage: brightness-ctl [get|set <0-100>]" >&2
+        exit 1
+        ;;
+esac