Refactoring and cleanup

* Moved logic from entrypoint to a dedicated class.
* Disabled automatic flush of state.
* Added locking support to prevent multiple instances.
* Added logging
* Added base interface for CredentialsLoader

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);
+        }
+
+    }
+
+
+}

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);
+    }
+}

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);