1 files changed, 94 insertions, 0 deletions
diff --git a/app/class/Logger.php b/app/class/Logger.php
new file mode 100644
index 0000000..939dbf8
--- /dev/null
+++ b/app/class/Logger.php
@@ -0,0 +1,94 @@
+<?php
+
+namespace Wcms;
+
+use Throwable;
+
+/**
+ * Class used to log messages.
+ * It must be init once at the very beginning of the application.
+ */
+class Logger
+{
+    private static $file = null;
+    private static $verbosity = 4;
+
+    /**
+     * Initialize the logger by openning the file and setting the log level.
+     *
+     * @param string $path the logfile's path
+     * @param int $verbosity 0: no log, 1: errors only, 2: add warn, 3: add info, 4: add debug.
+     */
+    public static function init(string $path, int $verbosity = 4)
+    {
+        self::$file = fopen($path, "a") or die("Unable to open log file!");
+        self::$verbosity = $verbosity;
+    }
+
+    protected static function write(string $level, string $msg, array $args = [])
+    {
+        $caller = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 2)[1];
+        $pwd = getcwd() . DIRECTORY_SEPARATOR;
+        $args = array_merge([
+            "[ $level ]",
+            str_replace($pwd, '', $caller['file']),
+            $caller['line']
+        ], $args);
+        vfprintf(self::$file, date('c') . " %-9s %s(%d) $msg\n", $args);
+    }
+
+    /**
+     * Log an error message using printf format.
+     */
+    public static function error(string $msg, ...$args)
+    {
+        if (self::$verbosity > 0) {
+            self::write('ERROR', $msg, $args);
+        }
+    }
+
+    /**
+     * Log a xarning message using printf format.
+     */
+    public static function warning(string $msg, ...$args)
+    {
+        if (self::$verbosity > 1) {
+            self::write('WARN', $msg, $args);
+        }
+    }
+
+    /**
+     * Log an info message using printf format.
+     */
+    public static function info(string $msg, ...$args)
+    {
+        if (self::$verbosity > 2) {
+            self::write('INFO', $msg, $args);
+        }
+    }
+
+    /**
+     * Log a debug message using printf format.
+     */
+    public static function debug(string $msg, ...$args)
+    {
+        if (self::$verbosity > 3) {
+            self::write('DEBUG', $msg, $args);
+        }
+    }
+
+    /**
+     * Log an exception.
+     */
+    public static function exception(Throwable $e, bool $withtrace = false)
+    {
+        if (self::$verbosity > 0) {
+            $msg = $e->getMessage();
+            if ($withtrace) {
+                // TODO: Maybe print a more beautiful stack trace.
+                $msg .= PHP_EOL . $e->getTraceAsString();
+            }
+            self::write('ERROR', $msg);
+        }
+    }
+}