Add brightness control using ddcutil to hyprland

The ddcutil is really slow by design and needing to wait the recommended
40-200ms after each request to get the response according to the ddc
protocol specifications.

For now this is a working draft, might switch to ddccontrol which is
much faster but limited to communicate over /dev/<id> which can't be
figured automatically or correlated with hyprctl monitors command

1 files changed, 117 insertions, 0 deletions

diff --git a/roles/hyprland/files/scripts/brightness.sh b/roles/hyprland/files/scripts/brightness.sh
new file mode 100644
index 00000000..10a33d8b
--- /dev/null
+++ b/roles/hyprland/files/scripts/brightness.sh
@@ -0,0 +1,117 @@
+#!/bin/bash
+
+# Original Inspiration:
+#  - https://github.com/basecamp/omarchy/issues/2509
+#  - https://albert.nz/hyprland-brightness
+# ---------------------
+
+# Get focused monitor name
+get_focused_display_name() {
+    hyprctl monitors -j | jq -r '.[] | select(.focused == true) | .name'
+}
+
+# Get focused monitor serial
+get_focused_display_serial() {
+    hyprctl monitors -j | jq -r '.[] | select(.focused == true) | .serial'
+}
+
+set_brightness_ddcutil() {
+    local display_serial="$1"
+    local step="$2"
+    local direction="$3"
+    ddcutil \
+        --noconfig \
+        --skip-ddc-checks \
+        --sleep-multiplier=0.1 \
+        --sn="$display_serial" \
+        setvcp 10 $direction "$step"
+}
+
+set_brightness_brightnessctl() {
+    local step="$1"
+    local direction="$2"
+    brightnessctl set "${step}%${direction}"
+}
+
+get_brightness_ddcutil() {
+    local display_serial="$1"
+    ddcutil \
+        --noconfig \
+        --skip-ddc-checks \
+        --sleep-multiplier=0.1 \
+        --sn="$display_serial" \
+        --terse getvcp 10 \
+        | awk '{print $4}'
+}
+
+get_brightness_brightnessctl() {
+    brightnessctl -m | cut -d, -f4 | sed 's/%//'
+}
+
+
+# Get current brightness for a specific monitor
+get_current_brightness() {
+    local display_name=$(get_focused_display_name)
+    local display_serial=$(get_focused_display_serial)
+    if [ "$display_name" = "eDP-1" ]; then
+        echo "$(get_brightness_brightnessctl)"
+    elif [ -n "$display_serial" ]; then
+        echo "$(get_brightness_ddcutil $display_serial)"
+    else
+        echo "N/A"
+    fi
+}
+
+# Set brightness for a specific monitor
+set_brightness() {
+    local step="$1"
+    local direction="$2"
+    local display_name=$(get_focused_display_name)
+    local display_serial=$(get_focused_display_serial)
+
+    if [ "$display_name" = "eDP-1" ]; then
+        set_brighntess_brightnessctl $step $direction
+    elif [ -n "$display_serial" ]; then
+        set_brightness_ddcutil $display_serial $step $direction
+    else
+        return
+    fi
+
+    notify $display_serial $display_name $(get_current_brightness)
+}
+
+notify() {
+    serial="$1"
+    name="$2"
+    value="$3"
+    notify-send -e \
+        -h string:x-canonical-private-synchronous:brightness-$serial \
+        -u low \
+        "Brightness" \
+        "   $name: $value%"
+}
+
+STEP="${2:-1}"
+case "$1" in
+    "--get")
+        value=$(get_current_brightness)
+        echo "${value}%"
+        ;;
+    "--set")
+        set_brightness $STEP
+        ;;
+    "--inc")
+        set_brightness $STEP +
+        ;;
+    "--dec")
+        set_brightness $STEP -
+        ;;
+    *)
+        echo -e "Usage:"
+        echo -e "  --get          to get current brightness value"
+        echo -e "  --set [arg]    to set current brightness value to [arg]%"
+        echo -e "  --inc [arg]    to increment current brightness value by [arg]%"
+        echo -e "  --dec [arg]    to decrement current brightness value by [arg]%"
+        exit 0
+        ;;
+esac