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#!/usr/bin/env bash
set -euo pipefail
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="$state_dir/polybar-display-night.state"
export DISPLAY="${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
notify() {
if command -v dunstify >/dev/null 2>&1; then
dunstify -a polybar -u low "Display" "$1"
fi
}
if [ -f "$state_file" ]; then
xrandr --output "$output" --gamma 1:1:1
rm -f "$state_file"
notify "day mode"
else
xrandr --output "$output" --gamma 1:0.88:0.72
: >"$state_file"
notify "night mode"
fi
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