Add simple logger as fallback logger implementation

Author: tdgroot

src/Configuration.php

@@ -4,7 +4,9 @@
 
 use Hypernode\DeployConfiguration\Command\Command;
 use Hypernode\DeployConfiguration\Command\DeployCommand;
+use Hypernode\DeployConfiguration\Logging\SimpleLogger;
 use Psr\Log\LoggerInterface;
+use Psr\Log\LogLevel;
 
 class Configuration
 {
@@ -147,6 +149,7 @@ class Configuration
     public function __construct(string $gitRepository)
     {
         $this->gitRepository = $gitRepository;
+        $this->logger = new SimpleLogger(LogLevel::INFO);
     }
 
     public function getGitRepository(): string

src/Logging/SimpleLogger.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace Hypernode\DeployConfiguration\Logging;
+
+use Psr\Log\AbstractLogger;
+use Psr\Log\LogLevel;
+
+/**
+ * Simple logger implementation using printf
+ */
+class SimpleLogger extends AbstractLogger
+{
+    private const LEVEL_MAPPING = [
+        LogLevel::DEBUG => 0,
+        LogLevel::INFO => 1,
+        LogLevel::NOTICE => 2,
+        LogLevel::WARNING => 3,
+        LogLevel::ERROR => 4,
+        LogLevel::CRITICAL => 5,
+        LogLevel::ALERT => 6,
+        LogLevel::EMERGENCY => 7
+    ];
+
+    /**
+     * @var int
+     */
+    private $mappedLevel;
+
+    public function __construct(string $level)
+    {
+        $this->mappedLevel = self::LEVEL_MAPPING[$level] ?? 1;
+    }
+
+    /**
+     * @param mixed $level 
+     * @param string|\Stringable $message 
+     * @param mixed[] $context 
+     * @return void 
+     */
+    public function log($level, $message, array $context = array())
+    {
+        if ($this->mapLevelToNumber($level) ?? 1 >= $this->mappedLevel) {
+            printf("%s (%s)\n", $message, json_encode($context));
+        }
+    }
+    
+    private static function mapLevelToNumber(string $level): int
+    {
+        return self::LEVEL_MAPPING[$level] ?? 1;
+    }
+}