Adds subcategories to the appenders and loggers. Adds property "level" at the file appender to limit the levels that a file appender accepts.

Creates a MARK category that always write to the log. That's useful to write things like '---- STARTED ----'.

lib/appenders/file.js

@@ -6,7 +6,8 @@ var layouts = require('../layouts')
 , streams = require('../streams')
 , os = require('os')
 , eol = os.EOL || '\n'
-, openFiles = [];
+, openFiles = []
+, levels = require('../levels');
 
 //close open files on process exit.
 process.on('exit', function() {
@@ -26,7 +27,7 @@ process.on('exit', function() {
  * @param numBackups - the number of log files to keep after logSize 
  *   has been reached (default 5)
  */
-function fileAppender (file, layout, logSize, numBackups) {
+function fileAppender (file, layout, logSize, numBackups, level) {
   var bytesWritten = 0;
   file = path.normalize(file);
   layout = layout || layouts.basicLayout;
@@ -60,10 +61,23 @@ function fileAppender (file, layout, logSize, numBackups) {
   
   // push file to the stack of open handlers
   openFiles.push(logFile);
-  
-  return function(loggingEvent) {
-    logFile.write(layout(loggingEvent) + eol, "utf8");
-  };
+
+  if (level) {
+
+    var obj = levels.toLevel(level, levels.TRACE);
+    return function(loggingEvent) {
+      if (obj.isLessThanOrEqualTo(loggingEvent.level)) 
+        logFile.write(layout(loggingEvent) + eol, "utf8");
+    };
+
+  } else {
+
+    return function(loggingEvent) {
+      logFile.write(layout(loggingEvent) + eol, "utf8");
+    };
+
+  }
+
 }
 
 function configure(config, options) {
@@ -76,7 +90,7 @@ function configure(config, options) {
     config.filename = path.join(options.cwd, config.filename);
   }
 
-  return fileAppender(config.filename, layout, config.maxLogSize, config.backups);
+  return fileAppender(config.filename, layout, config.maxLogSize, config.backups, config.level);
 }
 
 function shutdown(cb) {