Watcher plugin fixes

* com.noccy.watcher: Initial inotify support
* ScriptRunner now accepts an array of local vars for expansion
  when evaluating scripts

plugins/com.noccy.watcher/Monitor/InotifyMonitor.php

@@ -0,0 +1,97 @@
+<?php
+
+namespace SparkPlug\Com\Noccy\Watcher\Monitor;
+
+use SparkPlug\Com\Noccy\Watcher\Rule;
+
+class InotifyMonitor implements MonitorInterface
+{
+    private array $rules = [];
+
+    private array $watched = [];
+
+    private array $modified = [];
+
+    private $fd;
+
+    public function __construct()
+    {
+        $this->fd = \inotify_init();   
+    }
+
+    public function __destruct()
+    {
+        if (is_resource($this->fd)) fclose($this->fd);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function add(Rule $rule)
+    {
+        $this->rules[] = $rule;
+
+        $paths = $rule->getWatchedFiles();
+        $check = [];
+        foreach ($paths as $path) {
+            if (str_contains($path, '*')) {
+                $check = array_merge($check, glob($path));
+            } else {
+                $check[] = $path;
+            }
+        }
+        $dirs = [];
+        foreach ($check as $path) {
+            $dir = is_dir($path) ? $path : dirname($path);
+            if (!array_key_exists($dir, $dirs)) {
+                $dirs[$dir] = $rule;
+                \inotify_add_watch($this->fd, $dir, \IN_ATTRIB);
+            }
+        }
+        $this->watched = array_merge($this->watched, $dirs);
+
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getModified(): array
+    {
+        $mod = $this->modified;
+        $this->modified = [];
+        return $mod;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getWatched(): array
+    {
+        return [];        
+    }
+
+    public function loop()
+    {
+        $read = [ $this->fd ];
+        $write = null;
+        $except = null;
+        $changed = [];
+        while (stream_select($read,$write,$except,0)) {
+            $events = \inotify_read($this->fd);
+            foreach ($events as $event) {
+                $changed[] = $event['name'];
+            }
+        }
+
+        foreach ($changed as $file) {
+            foreach ($this->watched as $dir=>$rule) {
+                if (file_exists($dir."/".$file)) {
+                    if (!in_array($rule, $this->modified)) {
+                        printf("~ modified: %s (%s)\n", $dir."/".$file, $rule->getName());
+                        $this->modified[] = $rule;
+                    }
+                }
+            }
+        }
+    }
+}