Move SimpleLogger lib into app source tree

app/Core/Log/Base.php

@@ -0,0 +1,89 @@
+<?php
+
+namespace Kanboard\Core\Log;
+
+use Psr\Log\AbstractLogger;
+use Psr\Log\LogLevel;
+
+/**
+ * Base class for loggers
+ *
+ * @package Kanboard\Core\Log
+ * @author  Frédéric Guillot
+ */
+abstract class Base extends AbstractLogger
+{
+    /**
+     * Minimum log level for the logger
+     *
+     * @access private
+     * @var    string
+     */
+    private $level = LogLevel::DEBUG;
+
+    /**
+     * Set minimum log level
+     *
+     * @access public
+     * @param  string  $level
+     */
+    public function setLevel($level)
+    {
+        $this->level = $level;
+    }
+
+    /**
+     * Get minimum log level
+     *
+     * @access public
+     * @return string
+     */
+    public function getLevel()
+    {
+        return $this->level;
+    }
+
+    /**
+     * Dump to log a variable (by example an array)
+     *
+     * @param mixed $variable
+     */
+    public function dump($variable)
+    {
+        $this->log(LogLevel::DEBUG, var_export($variable, true));
+    }
+
+    /**
+     * Interpolates context values into the message placeholders.
+     *
+     * @access protected
+     * @param  string $message
+     * @param  array $context
+     * @return string
+     */
+    protected function interpolate($message, array $context = array())
+    {
+        // build a replacement array with braces around the context keys
+        $replace = array();
+
+        foreach ($context as $key => $val) {
+          $replace['{' . $key . '}'] = $val;
+        }
+
+        // interpolate replacement values into the message and return
+        return strtr($message, $replace);
+    }
+
+    /**
+     * Format log message
+     *
+     * @param  mixed  $level
+     * @param  string $message
+     * @param  array  $context
+     * @return string
+     */
+    protected function formatMessage($level, $message, array $context = array())
+    {
+        return '['.date('Y-m-d H:i:s').'] ['.$level.'] '.$this->interpolate($message, $context).PHP_EOL;
+    }
+}