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1 files changed, 39 insertions, 0 deletions

diff --git a/polybar/scripts/display-brightness.sh b/polybar/scripts/display-brightness.sh
new file mode 100755
index 0000000..ea3d04c
--- /dev/null
+++ b/polybar/scripts/display-brightness.sh
@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+direction="${1:-up}"
+state_dir="${XDG_RUNTIME_DIR:-/tmp}"
+if [ ! -w "$state_dir" ]; then
+  state_dir="${XDG_CACHE_HOME:-$HOME/.cache}"
+  mkdir -p "$state_dir"
+fi
+if [ ! -w "$state_dir" ]; then
+  state_dir="/tmp"
+fi
+state_file="$state_dir/polybar-display-brightness.state"
+
+export DISPLAY="${DISPLAY:-:0}"
+if [ -z "${XAUTHORITY:-}" ] && [ -r "$HOME/.Xauthority" ]; then
+  export XAUTHORITY="$HOME/.Xauthority"
+fi
+
+output="$(
+  xrandr --query 2>/dev/null |
+    awk '/ connected primary/ { print $1; exit } / connected/ && !out { out = $1 } END { if (out) print out }'
+)"
+
+[ -n "$output" ] || exit 0
+
+brightness="$(cat "$state_file" 2>/dev/null || printf '1.0')"
+
+case "$direction" in
+  up)
+    brightness="$(awk -v v="$brightness" 'BEGIN { v += 0.05; if (v > 1.00) v = 1.00; printf "%.2f", v }')"
+    ;;
+  down)
+    brightness="$(awk -v v="$brightness" 'BEGIN { v -= 0.05; if (v < 0.30) v = 0.30; printf "%.2f", v }')"
+    ;;
+esac
+
+printf '%s\n' "$brightness" >"$state_file"
+xrandr --output "$output" --brightness "$brightness"