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#!/bin/bash
# Day/night theme switcher + wallpaper/color applier.
# Two wallpapers: day.jpg (9:00-18:00) and night.jpg (18:00-9:00).
#
# Usage:
# ./theme-switcher.sh one-shot: apply based on current time, then exit
# ./theme-switcher.sh day|light force light theme, then exit
# ./theme-switcher.sh night|dark force dark theme, then exit
# ./theme-switcher.sh --daemon continuous time-based loop (used at login)
WALLPAPERS="$HOME/Pictures/wallpapers"
STATE_FILE="/tmp/current_theme_state"
WALLPAPER_STATE_FILE="/tmp/current_wallpaper_state"
BACKDROP_STATE_FILE="/tmp/current_backdrop_state"
PID_FILE="/tmp/theme-switcher.daemon.pid"
LOG="/tmp/theme-switcher.log"
SCRIPT_DIR="$(cd "$(dirname "$(realpath "$0")")" && pwd)"
SET_BACKDROP="$SCRIPT_DIR/set-backdrop.sh"
log() {
printf '%s %s\n' "$(date '+%Y-%m-%d %H:%M:%S')" "$*" >>"$LOG"
}
# Resolve TARGET_STATE / MODE / WALLPAPER. Optional $1 forces day|night.
resolve_target() {
local force="${1:-}"
if [ "$force" = "day" ] || [ "$force" = "light" ]; then
TARGET_STATE="light"
MODE="light"
WALLPAPER="$WALLPAPERS/day.jpg"
elif [ "$force" = "night" ] || [ "$force" = "dark" ]; then
TARGET_STATE="dark"
MODE="dark"
WALLPAPER="$WALLPAPERS/night.jpg"
else
local HOUR
HOUR=$(date +%H)
HOUR=$((10#$HOUR))
if [ "$HOUR" -ge 9 ] && [ "$HOUR" -lt 18 ]; then
TARGET_STATE="light"
MODE="light"
WALLPAPER="$WALLPAPERS/day.jpg"
else
TARGET_STATE="dark"
MODE="dark"
WALLPAPER="$WALLPAPERS/night.jpg"
fi
fi
}
# Apply the resolved target once. Returns 0 on success.
apply_target() {
if [ ! -f "$WALLPAPER" ]; then
log "wallpaper missing: $WALLPAPER"
return 1
fi
local CURRENT_THEME CURRENT_WALLPAPER EXPECTED_BACKDROP ACTUAL_BACKDROP
CURRENT_THEME=$(cat "$STATE_FILE" 2>/dev/null || true)
# Already in the correct theme: don't re-run wallust/matugen every loop tick.
# Still self-heal a drifted backdrop below, then bail out.
if [ "$CURRENT_THEME" = "$TARGET_STATE" ]; then
EXPECTED_BACKDROP=$(cat "$BACKDROP_STATE_FILE" 2>/dev/null || true)
ACTUAL_BACKDROP=$(awww query -n backdrop -j 2>/dev/null | jq -r '.["backdrop"][0].displaying.image // empty')
if [ -n "$EXPECTED_BACKDROP" ] && [ "$ACTUAL_BACKDROP" != "$EXPECTED_BACKDROP" ]; then
"$SET_BACKDROP" "$WALLPAPER"
fi
return 0
fi
CURRENT_WALLPAPER=$(cat "$WALLPAPER_STATE_FILE" 2>/dev/null || true)
# Self-heal the Overview backdrop if it drifted from the expected image.
EXPECTED_BACKDROP=$(cat "$BACKDROP_STATE_FILE" 2>/dev/null || true)
ACTUAL_BACKDROP=$(awww query -n backdrop -j 2>/dev/null | jq -r '.["backdrop"][0].displaying.image // empty')
if [ -n "$EXPECTED_BACKDROP" ] && [ "$ACTUAL_BACKDROP" != "$EXPECTED_BACKDROP" ]; then
"$SET_BACKDROP" "$WALLPAPER"
fi
log "switching to $TARGET_STATE ($WALLPAPER)"
if sh "$SCRIPT_DIR/apply-colors.sh" "$WALLPAPER" "$MODE"; then
if [ "$CURRENT_THEME" != "$TARGET_STATE" ]; then
darkman set "$TARGET_STATE"
fi
ln -sf \
"theme-${TARGET_STATE}.css" \
"$HOME/dotfiles-gentoo/waybar/.config/waybar/theme.css"
ln -sf \
"settings-${TARGET_STATE}.ini" \
"$HOME/dotfiles-gentoo/gtk/.config/gtk-3.0/settings.ini"
echo "$TARGET_STATE" >"$STATE_FILE"
echo "$WALLPAPER" >"$WALLPAPER_STATE_FILE"
log "switched to $TARGET_STATE ($WALLPAPER)"
return 0
else
log "FAILED to apply $TARGET_STATE ($WALLPAPER)"
return 1
fi
}
daemon_loop() {
# Refuse to run a second daemon instance (e.g. manual run while one is alive).
if [ -f "$PID_FILE" ] && kill -0 "$(cat "$PID_FILE" 2>/dev/null)" 2>/dev/null; then
log "daemon already running (pid $(cat "$PID_FILE")), exiting"
exit 0
fi
echo $$ >"$PID_FILE"
while true; do
resolve_target
apply_target || true # failure is retried on the next loop, state is left untouched
sleep 60
done
}
case "${1:-}" in
--daemon | -d) daemon_loop ;;
"" | day | light | night | dark)
resolve_target "${1:-}"
apply_target
exit $?
;;
-h | --help)
echo "usage: $0 [day|night|--daemon]" >&2
exit 0
;;
*)
echo "usage: $0 [day|night|--daemon]" >&2
exit 1
;;
esac
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