Stop motion wallpaper when the Omarchy theme changes

mpvpaper kept running over the new theme's static wallpaper because
nothing was watching the omarchy-theme symlink. Add a small sibling
script that polls ~/.config/omarchy/current/background and, when the
target changes, runs `motion-wallpaper-toggle stop` — which tears down
mpvpaper and respawns swaybg with the new symlink target so the new
theme's bg becomes visible.

- motion-wallpaper-theme-watcher: polls readlink every 2s, exits silently
  on non-Omarchy systems where the symlink doesn't exist.
- toggle: spawn alongside the auto-pause watcher; kill alongside it.
- wallpaper.sh: install the new binary.

motion-wallpaper-theme-watcher

@@ -0,0 +1,60 @@
+#!/usr/bin/env bash
+# ==============================================================================
+# Motion Wallpaper — theme-change watcher.
+#
+# Polls the Omarchy background symlink (~/.config/omarchy/current/background).
+# When the user switches themes (or cycles backgrounds), Omarchy points the
+# symlink at a new image. mpvpaper would otherwise keep running on top of the
+# new theme's static wallpaper, so we tear it down via the toggle script —
+# which also respawns swaybg with the *new* symlink target.
+#
+# Runs as a sibling to mpvpaper. Spawned and killed by motion-wallpaper-toggle.
+# ==============================================================================
+
+set -euo pipefail
+
+BG_LINK="$HOME/.config/omarchy/current/background"
+LOG_FILE="${XDG_CACHE_HOME:-$HOME/.cache}/motion-wallpaper.log"
+POLL_SECONDS=2
+
+log() {
+  printf '[%s] theme-watcher: %s\n' "$(date '+%Y-%m-%d %H:%M:%S')" "$*" >> "$LOG_FILE"
+}
+
+# Non-Omarchy systems won't have the symlink. Exit silently — auto-pause still
+# works without us; we only matter on Omarchy where theme-set rotates the bg.
+if [ ! -L "$BG_LINK" ] && [ ! -e "$BG_LINK" ]; then
+  log "no Omarchy background symlink at $BG_LINK — exiting"
+  exit 0
+fi
+
+initial="$(readlink -f "$BG_LINK" 2>/dev/null || true)"
+if [ -z "$initial" ]; then
+  log "could not resolve $BG_LINK — exiting"
+  exit 0
+fi
+log "watching $BG_LINK (initial=$initial)"
+
+# Locate the toggle binary in PATH first, then fall back to our own dir — same
+# trick the auto-pause watcher uses, since launcher-spawned PATH is minimal.
+TOGGLE="$(command -v motion-wallpaper-toggle 2>/dev/null || true)"
+if [ -z "$TOGGLE" ]; then
+  self_dir="$(dirname "$(readlink -f "$0")")"
+  if [ -x "$self_dir/motion-wallpaper-toggle" ]; then
+    TOGGLE="$self_dir/motion-wallpaper-toggle"
+  fi
+fi
+if [ -z "$TOGGLE" ]; then
+  log "motion-wallpaper-toggle not found — exiting"
+  exit 0
+fi
+
+while sleep "$POLL_SECONDS"; do
+  current="$(readlink -f "$BG_LINK" 2>/dev/null || true)"
+  [ -z "$current" ] && continue
+  if [ "$current" != "$initial" ]; then
+    log "background changed ($initial → $current) — stopping motion wallpaper"
+    "$TOGGLE" stop >/dev/null 2>&1 || true
+    exit 0
+  fi
+done

motion-wallpaper-toggle

@@ -322,29 +322,47 @@ kill_static_wallpapers() {
 }
 
 kill_watcher() {
-  pkill -f motion-wallpaper-watcher 2>/dev/null || true
+  pkill -f motion-wallpaper-watcher       2>/dev/null || true
+  pkill -f motion-wallpaper-theme-watcher 2>/dev/null || true
+}
+
+# Locate a sibling script — first in PATH, then in this script's dir. Used
+# for both watchers because launcher-spawned PATH is minimal.
+locate_sibling() {
+  local name="$1" path
+  path="$(command -v "$name" 2>/dev/null || true)"
+  if [ -z "$path" ]; then
+    local self_dir
+    self_dir="$(dirname "$(readlink -f "$0")")"
+    if [ -x "$self_dir/$name" ]; then
+      path="$self_dir/$name"
+    fi
+  fi
+  printf '%s' "$path"
 }
 
 start_watcher() {
-  local watcher
+  local watcher theme_watcher
-  # PATH in launcher-spawned terminals is unreliable (minimal systemd env etc),
+  watcher="$(locate_sibling motion-wallpaper-watcher)"
-  # so fall back to the script's own directory where the installer puts both.
+  theme_watcher="$(locate_sibling motion-wallpaper-theme-watcher)"
-  watcher="$(command -v motion-wallpaper-watcher 2>/dev/null || true)"
+
-  if [ -z "$watcher" ]; then
-    local self_dir
-    self_dir="$(dirname "$(readlink -f "$0")")"
-    if [ -x "$self_dir/motion-wallpaper-watcher" ]; then
-      watcher="$self_dir/motion-wallpaper-watcher"
-    fi
-  fi
-  if [ -z "$watcher" ]; then
-    log "watcher binary not found — auto-pause disabled"
-    return 0
-  fi
   kill_watcher
-  setsid "$watcher" < /dev/null >> "$LOG_FILE" 2>&1 &
+
-  disown 2>/dev/null || true
+  if [ -n "$watcher" ]; then
-  log "watcher spawned via $watcher"
+    setsid "$watcher" < /dev/null >> "$LOG_FILE" 2>&1 &
+    disown 2>/dev/null || true
+    log "auto-pause watcher spawned via $watcher"
+  else
+    log "auto-pause watcher binary not found — auto-pause disabled"
+  fi
+
+  if [ -n "$theme_watcher" ]; then
+    setsid "$theme_watcher" < /dev/null >> "$LOG_FILE" 2>&1 &
+    disown 2>/dev/null || true
+    log "theme watcher spawned via $theme_watcher"
+  else
+    log "theme watcher binary not found — theme-change auto-stop disabled"
+  fi
 }
 
 restore_static_wallpaper() {

wallpaper.sh

@@ -5,6 +5,7 @@
 # Installs:
 #   ~/.local/bin/motion-wallpaper-toggle              runtime TUI
 #   ~/.local/bin/motion-wallpaper-watcher             auto-pause watcher
+#   ~/.local/bin/motion-wallpaper-theme-watcher       theme-change watcher
 #   ~/.local/share/applications/motion-wallpaper-toggle.desktop   app entry
 #   ~/.local/share/icons/hicolor/scalable/apps/motion-wallpaper.svg   icon
 #   ~/.config/systemd/user/motion-wallpaper.service   optional autostart unit
@@ -29,10 +30,11 @@ fi
 
 TOGGLE_SRC="$SCRIPT_DIR/motion-wallpaper-toggle"
 WATCHER_SRC="$SCRIPT_DIR/motion-wallpaper-watcher"
+THEME_WATCHER_SRC="$SCRIPT_DIR/motion-wallpaper-theme-watcher"
 UNIT_SRC="$SCRIPT_DIR/motion-wallpaper.service"
 ICON_SRC="$SCRIPT_DIR/icons/motion-wallpaper.svg"
 
-for f in "$TOGGLE_SRC" "$WATCHER_SRC" "$UNIT_SRC" "$ICON_SRC"; do
+for f in "$TOGGLE_SRC" "$WATCHER_SRC" "$THEME_WATCHER_SRC" "$UNIT_SRC" "$ICON_SRC"; do
   if [ ! -f "$f" ]; then
     echo "Missing installer asset: $f" >&2
     exit 1
@@ -99,8 +101,9 @@ fi
 
 # ----- install files -----------------------------------------------------------
 
-install -D -m 755 "$TOGGLE_SRC"  "$HOME/.local/bin/motion-wallpaper-toggle"
+install -D -m 755 "$TOGGLE_SRC"        "$HOME/.local/bin/motion-wallpaper-toggle"
-install -D -m 755 "$WATCHER_SRC" "$HOME/.local/bin/motion-wallpaper-watcher"
+install -D -m 755 "$WATCHER_SRC"       "$HOME/.local/bin/motion-wallpaper-watcher"
+install -D -m 755 "$THEME_WATCHER_SRC" "$HOME/.local/bin/motion-wallpaper-theme-watcher"
 
 # Install custom SVG icon into the hicolor theme — Walker and other XDG-aware
 # launchers will find it by name (Icon=motion-wallpaper) without needing a