diff --git a/.gitignore b/.gitignore
index 2be2e62..b8e38c9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 /vendor
 /composer.lock
 /*.phar
+/src/version.php
+/dist
diff --git a/README.md b/README.md
index 6e069e3..14007c6 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,8 @@
 # Fresh: Keeping your docker stacks up to date
 
+Fresh was written to scratch an itch. It works by querying the respective repositories
+returning
+
 ## Building
 
 Build using NoccyLabs Pharlite.
@@ -7,30 +10,38 @@ Build using NoccyLabs Pharlite.
 
 ## Usage
 
-Options:
-
-```
-    -d,--dir <path>         Chdir to path on startup
-    -c,--config <file>      Read file as docker-compose.yml
-    -i,--image <image>      Only check if a newer image exists, set exitcode
-    -p,--pull               Only pull, don't restart anything
-    --credentials <type>    Credentials loader type (auto, basic)
-    --check                 Only check (set exitcode)
-    --slack <url>           Notify a Slack webhook on update
-    -q,--quiet              Don't show any extra output (except dockers)
-```
-
-Update everything and up any new containers in current dir:
+To check for updates, pull updated images and recreate any containers defined in the
+`docker-compose.yml` in the current directory:
 
 ```
 $ fresh.phar 
 ```
 
-Manually pulling when changed:
+For all available options, use the `--help` flag.
+
+## Known Issues
+
+- There is currently no way to update the state when manually updating using the
+  `--check` flag.
+- Only checks authenticated registries for new versions. But if you are using
+  this you probably aren't using DockerHub anyway.
+- ~Using the `-q` or `--quiet` flags doesn't mute the output from `docker-compose`.~
+- ~Using `--check` still updates the state, need a `--no-state` flag or so to ~
+  ~prevent updating the state.~
+
+## FAQ
+
+- **How does Fresh remember the last seen hash?** The container hashes are stored
+  in the same directory as the `docker-compose.yml` file in a file named `fresh.yml`.
+  Remove this file to force trigger an update.
+
+## Changes
+
+**0.1.1**
+
+- Moved the logic from the entrypoint script to its own class.
+- Added locking (though `fresh.lock` lockfile) to prevent multiple instances.
+- Added `--after` hook to invoke script after update.
+- Disabled automatic flushing of the state to disk; --check will no longer update
+  the state file, but --pull and default update will.
 
-```
-if ! fresh.phar --check; then
-    docker-compose pull
-    docker-compose up -d
-fi
-```
diff --git a/bin/freshdocker b/bin/freshdocker
index ba647a8..1eeac9e 100755
--- a/bin/freshdocker
+++ b/bin/freshdocker
@@ -1,154 +1,13 @@
 #!/usr/bin/env php
 <?php
 
-
-use NoccyLabs\FreshDocker\Configuration\DockerComposeConfiguration;
-use NoccyLabs\FreshDocker\Configuration\LocalConfiguration;
-use NoccyLabs\FreshDocker\Credentials\BasicCredentialsLoader;
-use NoccyLabs\FreshDocker\Hooks\SlackHook;
-use NoccyLabs\FreshDocker\ImageReference;
-use NoccyLabs\FreshDocker\Registry\RegistryV2Client;
-use NoccyLabs\FreshDocker\State\PersistentState;
-
 require_once __DIR__."/../vendor/autoload.php";
 
-$opts = getopt("hd:c:i:qv", [ "help", "dir:", "config:", "image:", "pull", "credentials:", "check", "slack:", "quiet", "prune" ]);
-
-if (array_key_exists('h', $opts) || array_key_exists('help', $opts)) {
-
-    printf("fresh.phar - (c) 2022, NoccyLabs / GPL v3 or later\n");
-    printf("Check for updates to docker images or compose stacks.\n\n");
-    printf("Usage:\n    %s [options]\n\n", basename($argv[0]));
-    printf("Options:\n");
-    printf("  General:\n");
-    foreach([
-        '-h,--help' => "Show this help",
-        '-q,--quiet' => "Don't show any output (except dockers)",
-        '-d,--dir DIR' => "Change working directory to DIR",
-        '-i,--image REF' => "Check a specific image instead of using config/docker-compose",
-        '--pull' => "Only pull if new, don't up",
-        '--check' => "Only check, set exit code 1 if not fresh",
-        '--prune' => "Prune dangling images after pull and up", 
-    ] as $a=>$b) printf("    %-20s %s\n", $a, $b);
-
-    printf("  Webhooks:\n");
-    foreach([
-        '--slack URL' => "Notify a Slack webhook when updating",
-    ] as $a=>$b) printf("    %-20s %s\n", $a, $b);
-
-    printf("  Configuration:\n");
-    foreach([
-        '-c,--config FILE' => "Use a custom configuration (not implemented)",
-        '--credentials TYPE' => "Select credentials loader (auto or basic)",
-    ] as $a=>$b) printf("    %-20s %s\n", $a, $b);
-    
-
-    exit(0);
-
+if (file_exists(__DIR__."/../src/version.php")) {
+    require_once __DIR__."/../src/version.php";
+} else {
+    define("APP_VERSION", "DEV");
 }
 
-$credentialsLoaderType = $opts['credentials'] ?? 'auto';
-$path = realpath($opts['d'] ?? ($opts['dir'] ?? getcwd()));
-$onlyPull = array_key_exists('p', $opts) || array_key_exists('pull', $opts);
-$onlyCheck = array_key_exists('check', $opts);
-$quiet = array_key_exists('q', $opts) || array_key_exists('quiet', $opts);
-$verbose = array_key_exists('v', $opts);
-$prune = array_key_exists('prune', $opts);
-
-$slackUrl = array_key_exists('slack', $opts) ? $opts['slack'] : null;
-$slackHook = null;
-if ($slackUrl) {
-    $slackHook = new SlackHook([
-        'url' => $slackUrl
-    ]);
-}
-
-if (!is_dir($path)) {
-    fwrite(STDERR, "error: invalid path for --dir/-d\n");
-    exit(2);
-}
-chdir($path);
-
-$path = getcwd();
-if (!file_exists($path."/docker-compose.yml")) {
-    fwrite(STDERR, "error: no docker-compose.yml in the current directory\n");
-    exit(2);
-}
-
-switch ($credentialsLoaderType) {
-    case 'auto':
-    case 'basic':
-        $credentialsLoader = new BasicCredentialsLoader();
-        break;
-    default:
-        fwrite(STDERR, "error: invalid credentials loader {$credentialsLoaderType}\n");
-        exit(2);
-}
-
-//$configuration = new LocalConfiguration(getcwd()."/freshdocker.conf");
-$configuration = new DockerComposeConfiguration("{$path}/docker-compose.yml");
-$state = new PersistentState("{$path}/fresh.yml");
-$checks = $configuration->getChecks();
-if (count($checks) === 0) {
-    fwrite(STDERR, "error: couldn't find any images to check\n");
-    exit(2);
-}
-$update = false;
-
-$log = [];
-foreach ($checks as $check) {
-
-    $ref = new ImageReference($check);
-    $reg = $ref->getRegistry();
-
-    $credentials = $credentialsLoader->getCredentials($reg);
-    if (!$credentials) {
-        if ($verbose) printf("%s: missing credentials for %s\n", $ref->getImage(), $ref->getRegistry());
-        continue;
-    }
-    $client = new RegistryV2Client($reg, $credentials);
-
-
-    $status = $client->getImageStatus($ref->getImage(), $ref->getTag());
-    $image = $status['image'].":".$status['tag'];
-    $oldHash = $state->get($image);
-    $newHash = $status['hash'];
-    $state->set($image, $newHash);
-
-    if ($oldHash != $newHash) {
-        if (!$quiet) printf("%s: %s → %s\n", $image, truncate($oldHash), truncate($newHash));
-        $log[] = sprintf("%s: %s → %s\n", $image, truncate($oldHash), truncate($newHash));
-        $update = true;
-    } else {
-        if (!$quiet) printf("%s: %s\n", $image, truncate($newHash));
-    }
-}
-
-
-if ($onlyCheck) {
-    exit($update?1:0);
-}
-
-if ($update) {
-    if ($slackHook) {
-        $msg = "Deploying new container versions:\n* ".join("\n* ", $log);
-        $slackHook->sendMessage($msg, []);
-    }
-    passthru("docker-compose pull");
-    if (!$onlyPull) {
-        passthru("docker-compose up -d");
-        if ($prune) {
-            passthru("docker image prune -f");
-        }
-    }
-}
-
-exit($update?1:0);
-
-function truncate(?string $hash): string
-{
-    if ($hash === null) return '*';
-    return substr($hash, 0, 4) . ".." . substr($hash, -4, 4);
-}
-
-
+$r = new NoccyLabs\FreshDocker\Refresher();
+$r->run();
diff --git a/src/Configuration/DockerComposeConfiguration.php b/src/Configuration/ComposeConfiguration.php
similarity index 95%
rename from src/Configuration/DockerComposeConfiguration.php
rename to src/Configuration/ComposeConfiguration.php
index ac22676..d16d233 100644
--- a/src/Configuration/DockerComposeConfiguration.php
+++ b/src/Configuration/ComposeConfiguration.php
@@ -4,7 +4,7 @@ namespace NoccyLabs\FreshDocker\Configuration;
 
 use Symfony\Component\Yaml\Yaml;
 
-class DockerComposeConfiguration
+class ComposeConfiguration
 {
 
     private array $checks = [];
diff --git a/src/Credentials/BasicCredentialsLoader.php b/src/Credentials/BasicCredentialsLoader.php
index 3f77495..3047b58 100644
--- a/src/Credentials/BasicCredentialsLoader.php
+++ b/src/Credentials/BasicCredentialsLoader.php
@@ -2,7 +2,7 @@
 
 namespace NoccyLabs\FreshDocker\Credentials;
 
-class BasicCredentialsLoader
+class BasicCredentialsLoader implements CredentialsLoaderInterface
 {
 
     private array $auth = [];
diff --git a/src/Credentials/CredentialsLoaderInterface.php b/src/Credentials/CredentialsLoaderInterface.php
new file mode 100644
index 0000000..2d0d413
--- /dev/null
+++ b/src/Credentials/CredentialsLoaderInterface.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace NoccyLabs\FreshDocker\Credentials;
+
+interface CredentialsLoaderInterface
+{
+
+    public function getCredentials(string $repo): ?array;
+    
+}
\ No newline at end of file
diff --git a/src/Refresher.php b/src/Refresher.php
new file mode 100644
index 0000000..3aaf2b4
--- /dev/null
+++ b/src/Refresher.php
@@ -0,0 +1,362 @@
+<?php
+
+namespace NoccyLabs\FreshDocker;
+
+use NoccyLabs\FreshDocker\State\Log;
+use NoccyLabs\FreshDocker\Configuration\ComposeConfiguration;
+use NoccyLabs\FreshDocker\Configuration\LocalConfiguration;
+use NoccyLabs\FreshDocker\Credentials\BasicCredentialsLoader;
+use NoccyLabs\FreshDocker\Credentials\CredentialsLoaderInterface;
+use NoccyLabs\FreshDocker\Hooks\SlackHook;
+use NoccyLabs\FreshDocker\ImageReference;
+use NoccyLabs\FreshDocker\Registry\RegistryV2Client;
+use NoccyLabs\FreshDocker\State\PersistentState;
+use NoccyLabs\FreshDocker\State\Lockfile;
+
+class Refresher
+{
+    private static array $optionsMap = [
+        'General' => [
+            'help'  => [ 'h', 'help', "Show this help" ],
+            'quiet' => [ 'q', 'quiet', "Don't show any output" ],
+            'verbose' => [ 'v', null, "Show debug output", null, false ],
+            'path'  => [ 'd:', 'dir:', "Change working directory", "FRESH_DIR" ],
+            'image' => [ 'i:', 'image:', "Check a specific image instead of images from config", "FRESH_IMAGE" ],
+            'pull'  => [ null, 'pull', "Only pull if updated, don't up" ],
+            'check' => [ null, 'check', "Only check for updates, set exit code" ],
+            'prune' => [ null, 'prune', "Prune dangling images after pull and up" ],
+        ],
+        'Hooks' => [
+            'slack' => [ null, 'slack:', "Notify a slack webhook when updating", "FRESH_SLACK" ],
+            'script' => [ null, 'after:', "Invoke script after updating", "FRESH_AFTER" ],
+        ],
+        'Config' => [
+            'config' => [ 'c:', 'config:', "Use custom configuration file", "FRESH_CONFIG" ],
+            'type' => [ 'C:', 'config-type:', "Configuration type (auto, fresh, compose)", "FRESH_CONFIG_TYPE", "auto" ],
+            'credentials' => [ null, 'credentials:', "Set credentials loader type (auto or basic)", "FRESH_CREDENTIALS", "auto" ],
+        ]
+    ];
+
+    private array $options = [];
+
+    /** @var HookInterface[] The hooks to invoke */
+    private array $hooks = [];
+
+    private ?string $path = null;
+
+    private Log $log;
+
+    private $config;
+
+    private CredentialsLoaderInterface $credentialsLoader;
+
+    private PersistentState $state;
+
+    private Lockfile $lockfile;
+
+    public function __construct()
+    {
+        $this->log = new Log();
+    }
+
+    /**
+     * Parse the command line and set values from getopt output or environment
+     * variables.
+     * 
+     */
+    protected function parseCommandLine()
+    {
+        $opts = [];
+        $long = [];
+        $short = null;
+        $envs = [];
+        $parsed = [];
+        foreach (self::$optionsMap as $group=>$options) {
+            $opts = array_merge($opts, $options);
+            foreach ($options as $optname=>$opt) {
+                if ($opt[0]) $short .= $opt[0];
+                if ($opt[1]) $long[] = $opt[1];
+                if ($opt[3]??null) $envs[$opt[3]] = $optname;
+                $parsed[$optname] = $opt[4] ?? null;
+            }
+        }
+
+        foreach ($envs as $env=>$dest) {
+            $val = getenv($env) ?? $_SERVER[$env];
+            if ($val) {
+                $parsed[$dest] = $val;
+            }
+        }
+
+        $geto = getopt($short, $long);
+        foreach ($geto as $k=>$v) {
+            foreach ($opts as $o=>$oo) {
+                $h = null;
+                if ($k == rtrim($oo[0],':')) {
+                    $h = str_ends_with($oo[0],':');
+                } elseif ($k == rtrim($oo[1],':')) {
+                    $h = str_ends_with($oo[0],':');
+                }
+                if ($h !== null) {
+                    $parsed[$o] = $h ? $v : true;
+                }
+            }
+        }
+
+        $this->options = $parsed;
+
+        $this->log->setVerbose($parsed['verbose']);
+
+    }
+
+    public function printUsage()
+    {
+
+        printf("fresh.phar v%s - (c) 2022, NoccyLabs / GPL v3 or later\n", APP_VERSION);
+        printf("Check for updates to docker images or compose stacks.\n\n");
+        printf("Usage:\n    %s [options]\n\n", basename($GLOBALS['argv'][0]));
+        printf("Options:\n");
+        foreach(self::$optionsMap as $group=>$options) {
+            printf("  %s:\n", $group);
+            foreach ($options as $opt) {
+                $s = rtrim($opt[0], ':');
+                $l = rtrim($opt[1], ':');
+                $h = str_ends_with($opt[0],':') || str_ends_with($opt[1],':');
+                $d = $opt[4]??null;
+                $e = $opt[3]??null;
+                $optkey = null;
+                if ($s) $optkey .= "-" . $s;
+                if ($s&&$l) $optkey .= ",";
+                if ($l) $optkey .= "--" . $l;
+                if ($h) $optkey .= " VALUE";
+                printf("    %-25s %s", $optkey, $opt[2]);
+                if ($d) printf(" (default: %s)", $d);
+                if ($e) printf(" [\$%s]", $e);
+                echo "\n";
+            }
+        }
+        printf("\nNote:\n");
+        printf("    When invoked without any flags, fresh will look for a docker-compose.yml file and\n");
+        printf("    check all images in repositories for which credentials are available. If any of those\n");
+        printf("    images have been updated, the new images will be pulled and the containers recreated\n");
+        printf("    and restarted. If you only want to pull, use the --pull flag. If you only want to check\n");
+        printf("    for updates, use the --check flag and check the exit code.\n");
+            
+    }
+
+    public function run()
+    {
+        $this->parseCommandLine();
+        if ($this->options['help']) {
+            $this->printUsage();
+            exit(0);
+        }
+
+        try {
+
+            $this->setupDirectory();
+            $this->setupCredentialsLoader();
+            $this->setupConfiguration();
+            $this->setupHooks();
+
+            $updated = $this->checkUpdates();
+
+            // If called with --check, only return exit status
+            if ($this->options['check']) {
+                exit(($updated === null) ? 0 : 1);
+            }
+
+            if ($updated !== null) {
+                $this->callHooks($updated);
+                $this->doUpdate($updated);
+                $this->callScript();
+            }
+                
+            exit(($updated === null) ? 0 : 1);
+
+        } catch (\Throwable $t) {
+            fprintf(STDERR, "fatal: %s (%s#%d)\n", $t->getMessage(), $t->getFile(), $t->getLine());
+            if (!$this->options['verbose']) {
+                fprintf(STDERR, $this->log->asString()."\n");
+            }
+            exit(2);
+        }
+
+    }
+
+    /**
+     * Makes sure the directory is valid, and prepares the state file and the lockfile
+     * to be used.
+     * 
+     */
+    private function setupDirectory()
+    {
+        $this->path = $this->options['path'] ? realpath($this->options['path']) : getcwd();
+        if (!is_dir($this->path)) {
+            fwrite(STDERR, "error: No such path {$this->options['path']}\n");
+            exit(2);
+        }
+        $this->log->append("Working dir: ".$this->path);
+        chdir($this->path);
+
+        $this->state = new PersistentState($this->path . "/fresh.yml");
+        $this->lockfile = new Lockfile($this->path . "/fresh.lock");
+    }
+
+    /**
+     * Initialize the credentials loader to retrieve registry credentials
+     * 
+     */
+    private function setupCredentialsLoader()
+    {
+        switch ($this->options['credentials']) {
+            case 'auto':
+            case 'basic':
+                $this->credentialsLoader = new BasicCredentialsLoader();
+                $this->log->append("Using BasicCredentialsLoader for credentials");
+                break;
+            default:
+                fwrite(STDERR, "error: Invalid credentials loader type\n");
+                exit(2);
+        }
+    }
+
+    /**
+     * Initialize the configuration to use for updating
+     * 
+     */
+    private function setupConfiguration()
+    {
+
+        if (file_exists($this->path."/docker-compose.yml")) {
+            $this->config = new ComposeConfiguration($this->path."/docker-compose.yml");
+        } else {
+            fwrite(STDERR, "error: Couldn't find a supported configuration file\n");
+            exit(2);
+        }
+    }
+
+    /**
+     * Check for newer versions of the image(s)
+     * 
+     * @return array|null An array of information on updated images
+     */
+    private function checkUpdates(): ?array
+    {
+
+        $this->lockfile->lock();
+
+        $checks = $this->config->getChecks();
+        if (count($checks) === 0) {
+            fwrite(STDERR, "error: couldn't find any images to check\n");
+            exit(2);
+        }
+        $update = [];
+        $quiet = $this->options['quiet'];
+
+        $this->log->append("Checking ".count($checks)." images");
+        foreach ($checks as $check) {
+
+            $ref = new ImageReference($check);
+            $reg = $ref->getRegistry();
+
+            $credentials = $this->credentialsLoader->getCredentials($reg);
+            if (!$credentials) {
+                $this->log->append(sprintf("  %s: missing credentials for registry", $reg."/".$ref->getImage(), $ref->getRegistry()));
+                continue;
+            }
+            $client = new RegistryV2Client($reg, $credentials);
+
+
+            $status = $client->getImageStatus($ref->getImage(), $ref->getTag());
+            $image = $reg."/".$status['image'].":".$status['tag'];
+            $oldHash = $this->state->get($image);
+            $newHash = $status['hash'];
+
+            if ($oldHash != $newHash) {
+                if (!$quiet && !$this->options['verbose']) printf("%s: %s → %s\n", $image, $this->truncateHash($oldHash), $this->truncateHash($newHash));
+                $this->log->append(sprintf("  %s: %s → %s", $image, $this->truncateHash($oldHash), $this->truncateHash($newHash)));
+                $this->state->set($image, $newHash);
+                $update[] = (object)[
+                    'ref' => $ref,
+                    'old' => $oldHash,
+                    'new' => $newHash
+                ];
+            } else {
+                $this->log->append(sprintf("  %s: %s", $image, $this->truncateHash($newHash)));
+            }
+        }
+
+        return empty($update) ? null : $update;
+    }
+
+    public function doUpdate()
+    {
+        $this->log->append("Pulling updated images...");
+        $this->exec("docker-compose pull -q");
+        if (!$this->options['pull']) {
+            $this->log->append("Refreshing updated containers...");
+            $this->exec("docker-compose up -d");
+            if ($this->options['prune']) {
+                $this->log->append("Pruning dangling images...");
+                $this->exec("docker image prune -f");
+            }
+        }
+
+        $this->log->append("Flushing state...");
+        $this->state->flush();
+
+    }
+
+    private function setupHooks()
+    {
+        $slackUrl = $this->options['slack'];
+        if ($slackUrl) {
+            $this->hooks[] = new SlackHook([
+                'url' => $slackUrl
+            ]);
+        }
+    }
+
+    private function callHooks(array $updated)
+    {
+        $images = [];
+        foreach ($updated as $u) {
+            $images[] = sprintf("%s/%s:%s", $u->ref->getRegistry(), $u->ref->getImage(), $u->ref->getTag());
+        }
+        $msg = "Deploying updated containers:\n* ".join("\n* ", $images);
+
+        foreach ($this->hooks as $hook) {
+            $hook->sendMessage($msg);
+        }
+
+    }
+
+    private function callScript()
+    {
+        $script = $this->options['script'];
+        if ($script) {
+            $this->exec($script);
+        }
+    }
+
+    private function truncateHash(?string $hash): string
+    {
+        if ($hash === null) return '?';
+        return substr($hash, 0, 4) . ".." . substr($hash, -4, 4);
+    }
+
+    private function exec(string $cmdl)
+    {
+        $this->log->append("$ {$cmdl}");
+        $fd = popen($cmdl." 2>&1","r");
+        while (!feof($fd)) {
+            $s = rtrim(fgets($fd));
+            if (trim($s))
+                $this->log->append($s);
+        }
+        fclose($fd);
+    }
+
+}
+
diff --git a/src/State/Lockfile.php b/src/State/Lockfile.php
new file mode 100644
index 0000000..bf325f7
--- /dev/null
+++ b/src/State/Lockfile.php
@@ -0,0 +1,36 @@
+<?php
+
+namespace NoccyLabs\FreshDocker\State;
+
+class Lockfile
+{
+    private string $filename;
+
+    private int $maxLock = 3600;
+
+    public function __construct(string $filename)
+    {
+        $this->filename = $filename;
+        register_shutdown_function([$this,"release"]);
+    }
+
+    public function lock()
+    {
+        if (file_exists($this->filename)) {
+            if (time() - filemtime($this->filename) < $this-$maxLock) {
+                throw new \RuntimeException("Lockfile {$this->filename} already exists");
+            }
+        }
+        touch($this->filename);
+    }
+
+    public function release()
+    {
+        if (file_exists($this->filename)) {
+            unlink($this->filename);
+        }
+
+    }
+
+
+}
\ No newline at end of file
diff --git a/src/State/Log.php b/src/State/Log.php
new file mode 100644
index 0000000..4c8f722
--- /dev/null
+++ b/src/State/Log.php
@@ -0,0 +1,39 @@
+<?php
+
+namespace NoccyLabs\FreshDocker\State;
+
+class Log
+{
+    private bool $verbose = false;
+
+    private array $log = [];
+
+    public function __construct(bool $verbose=false)
+    {
+        $this->verbose = $verbose;
+    }
+
+    public function setVerbose(bool $verbose)
+    {
+        $this->verbose = $verbose;
+    }
+
+    public function append(string $message)
+    {
+        array_push($this->log, $message);
+        if ($this->verbose) {
+            fwrite(STDOUT, $message . "\n");
+        }
+    }
+
+    public function flush()
+    {
+        if ($this->verbose) return;
+        fwrite(STDOUT, join("\n", $this->log)."\n");
+    }
+
+    public function asString(): string
+    {
+        return join("\n", $this->log);
+    }
+}
\ No newline at end of file
diff --git a/src/State/PersistentState.php b/src/State/PersistentState.php
index 24cdbbf..b18e18f 100644
--- a/src/State/PersistentState.php
+++ b/src/State/PersistentState.php
@@ -15,15 +15,17 @@ class PersistentState
     public function __construct(string $filename)
     {
         $this->filename = $filename;
-        register_shutdown_function([$this,"flush"]);
+        // register_shutdown_function([$this,"flush"]);
         if (file_exists($filename)) {
-            $this->state = Yaml::parseFile($filename);
+            $this->state = Yaml::parseFile($filename) ?? [];
         }
     }
 
     public function flush()
     {
         if (!$this->dirty) return;
+        $this->dirty = false;
+
         $yaml = Yaml::dump($this->state);
         file_put_contents($this->filename."~", $yaml);
         rename($this->filename."~", $this->filename);