php-spark/plugins/com.noccy.watcher/FileWatcher.php

<?php // "name":"Watch files and act when they are changed", "author":"Noccy"

namespace SparkPlug\Com\Noccy\Watcher;

use Spark\Environment\ScriptRunner;
use SparkPlug\Com\Noccy\Watcher\Monitor\MonitorInterface;
use SparkPlug\Com\Noccy\Watcher\Monitor\MtimeMonitor;
use SparkPlug\Com\Noccy\Watcher\Monitor\InotifyMonitor;

class FileWatcher {

    private MonitorInterface $monitor;

    private ScriptRunner $scriptRunner;

    private array $rules = [];

    public function __construct()
    {
        if (extension_loaded('inotify') && !getenv("SPARK_NO_INOTIFY")) {
            //$this->monitor = new MtimeMonitor();
            printf("Enabling inotify support, watching directories\n");
            $this->monitor = new InotifyMonitor();
        } else {
            printf("No inotify support, watching file mtimes\n");
            $this->monitor = new MtimeMonitor();
        }
        $this->scriptRunner = get_environment()->getScriptRunner();
    }

    public function addRule(Rule $rule)
    {
        if ($rule->getInitialTrigger()) {
            $this->triggerRule($rule);
        }
        $this->rules[] = $rule;
        $this->monitor->add($rule);
    }

    private function triggerRule(Rule $rule) 
    {
        $actions = $rule->getActions();
        $locals = [
            'WATCHER_RULE' => $rule->getName(),
            'WATCHER_FILES' => join(" ",$rule->getWatchedFiles()),
        ];
        $this->scriptRunner->evaluate($actions, $locals);
    }

    public function loop()
    {
        $this->monitor->loop();
        $modified = $this->monitor->getModified();
        foreach ($modified as $rule) {
            $this->triggerRule($rule);
        }
    }
}