Fix clipboard watcher lifecycle

shell/plugins/clipboard/init.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+current_script=${1:-}
+[[ -n $current_script ]] || exit 0
+
+is_clipboard_capture() {
+  local path=$1
+
+  [[ $path == */shell/plugins/clipboard/capture.sh ]]
+}
+
+watched_script_for_pid() {
+  local pid=$1
+  local -a args=()
+  local i
+
+  [[ -r /proc/$pid/cmdline ]] || return 1
+  mapfile -d '' -t args <"/proc/$pid/cmdline" || return 1
+  ((${#args[@]} > 0)) || return 1
+
+  for ((i = 0; i < ${#args[@]}; i++)); do
+    if [[ ${args[i]} == "--watch" ]]; then
+      printf '%s\n' "${args[i + 1]:-}"
+      return 0
+    fi
+  done
+
+  return 1
+}
+
+for pid in $(pgrep -x wl-paste 2>/dev/null || true); do
+  watched_script=$(watched_script_for_pid "$pid" || true)
+  [[ -n $watched_script ]] || continue
+  is_clipboard_capture "$watched_script" || continue
+
+  if [[ $watched_script == $current_script || ! -e $watched_script ]]; then
+    kill "$pid" 2>/dev/null || true
+  fi
+done