Move SimpleLogger lib into app source tree

app/Core/Log/Syslog.php

@@ -0,0 +1,72 @@
+<?php
+
+namespace Kanboard\Core\Log;
+
+use RuntimeException;
+use Psr\Log\LogLevel;
+
+/**
+ * Syslog Logger
+ *
+ * @package Kanboard\Core\Log
+ * @author  Frédéric Guillot
+ */
+class Syslog extends Base
+{
+    /**
+     * Setup Syslog configuration
+     *
+     * @param  string $ident    Application name
+     * @param  int    $facility See http://php.net/manual/en/function.openlog.php
+     */
+    public function __construct($ident = 'PHP', $facility = LOG_USER)
+    {
+        if (! openlog($ident, LOG_ODELAY | LOG_PID, $facility)) {
+            throw new RuntimeException('Unable to connect to syslog.');
+        }
+    }
+
+    /**
+     * Get syslog priority according to Psr\LogLevel
+     *
+     * @param  mixed  $level
+     * @return integer
+     */
+    public function getSyslogPriority($level)
+    {
+        switch ($level) {
+            case LogLevel::EMERGENCY:
+                return LOG_EMERG;
+            case LogLevel::ALERT:
+                return LOG_ALERT;
+            case LogLevel::CRITICAL:
+                return LOG_CRIT;
+            case LogLevel::ERROR:
+                return LOG_ERR;
+            case LogLevel::WARNING:
+                return LOG_WARNING;
+            case LogLevel::NOTICE:
+                return LOG_NOTICE;
+            case LogLevel::INFO:
+                return LOG_INFO;
+        }
+
+        return LOG_DEBUG;
+    }
+
+    /**
+     * Logs with an arbitrary level.
+     *
+     * @param  mixed   $level
+     * @param  string  $message
+     * @param  array   $context
+     * @return null
+     */
+    public function log($level, $message, array $context = array())
+    {
+        $syslogPriority = $this->getSyslogPriority($level);
+        $syslogMessage = $this->interpolate($message, $context);
+
+        syslog($syslogPriority, $syslogMessage);
+    }
+}