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#!/bin/bash
# Manual theme switcher + wallpaper/color applier.
# No time-based switching: you pick the wallpaper and mode explicitly.
#
# Usage:
# ./theme-switcher.sh <image> <day|night> apply <image> in light/dark mode, remember it
# ./theme-switcher.sh --last apply the last manually-set wallpaper+mode
# ./theme-switcher.sh -h | --help show this help
WALLPAPERS="$HOME/Pictures/wallpapers"
STATE_FILE="/tmp/current_theme_state"
WALLPAPER_STATE_FILE="/tmp/current_wallpaper_state"
BACKDROP_STATE_FILE="/tmp/current_backdrop_state"
LAST_FILE="${XDG_STATE_HOME:-$HOME/.local/state}/theme-switcher/last"
LOG="/tmp/theme-switcher.log"
SCRIPT_DIR="$(cd "$(dirname "$(realpath "$0")")" && pwd)"
SET_BACKDROP="$SCRIPT_DIR/set-backdrop.sh"
log() {
printf '%s %s\n' "$(date '+%Y-%m-%d %H:%M:%S')" "$*" >>"$LOG"
}
# Persist the last manually-chosen wallpaper + mode so --last survives reboots.
save_last() {
mkdir -p "$(dirname "$LAST_FILE")"
printf '%s\n%s\n' "$WALLPAPER" "$MODE" >"$LAST_FILE"
}
# Load the last chosen wallpaper + mode. Falls back to the old default so a
# fresh boot (nothing saved yet) never lands on a blank wallpaper.
load_last() {
if [ -f "$LAST_FILE" ]; then
WALLPAPER=$(sed -n '1p' "$LAST_FILE")
MODE=$(sed -n '2p' "$LAST_FILE")
case "$MODE" in
light) TARGET_STATE="light" ;;
*) TARGET_STATE="dark"; MODE="dark" ;;
esac
else
WALLPAPER="$WALLPAPERS/night.jpg"
TARGET_STATE="dark"
MODE="dark"
fi
}
# Resolve TARGET_STATE / MODE from an explicit mode argument.
resolve_explicit() {
local mode="$1"
case "$mode" in
day | light) TARGET_STATE="light"; MODE="light" ;;
night | dark) TARGET_STATE="dark"; MODE="dark" ;;
*)
echo "mode must be day|night (got: $mode)" >&2
exit 1
;;
esac
}
# Apply the resolved target once. Returns 0 on success.
apply_target() {
if [ ! -f "$WALLPAPER" ]; then
log "wallpaper missing: $WALLPAPER"
return 1
fi
local CURRENT_THEME CURRENT_WALLPAPER EXPECTED_BACKDROP ACTUAL_BACKDROP
CURRENT_THEME=$(cat "$STATE_FILE" 2>/dev/null || true)
CURRENT_WALLPAPER=$(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" "$WALLPAPER"
fi
# Already in this exact theme AND wallpaper: skip the heavy color work.
if [ "$CURRENT_THEME" = "$TARGET_STATE" ] && [ "$CURRENT_WALLPAPER" = "$WALLPAPER" ]; then
return 0
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/.config/waybar/theme.css"
ln -sf \
"settings-${TARGET_STATE}.ini" \
"$HOME/dotfiles-gentoo/.config/gtk-3.0/settings.ini"
echo "$TARGET_STATE" >"$STATE_FILE"
echo "$WALLPAPER" >"$WALLPAPER_STATE_FILE"
save_last
log "switched to $TARGET_STATE ($WALLPAPER)"
return 0
else
log "FAILED to apply $TARGET_STATE ($WALLPAPER)"
return 1
fi
}
usage() {
cat >&2 <<EOF
usage: $0 <image> <day|night> | --last
<image> <day|night> apply <image> in light/dark mode and remember it
--last apply the last manually-set wallpaper + mode
EOF
}
case "${1:-}" in
--last)
load_last
apply_target
exit $?
;;
-h | --help)
usage
exit 0
;;
"")
usage
exit 1
;;
*)
WALLPAPER="${1:-}"
MODEARG="${2:-}"
if [ -z "$MODEARG" ]; then
echo "missing mode (day|night)" >&2
usage
exit 1
fi
resolve_explicit "$MODEARG"
apply_target
exit $?
;;
esac
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