Log compression.

lib/appenders/file.js

@@ -27,7 +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, level) {
+function fileAppender (file, layout, logSize, numBackups, level, compress) {
   var bytesWritten = 0;
   file = path.normalize(file);
   layout = layout || layouts.basicLayout;
@@ -41,7 +41,8 @@ function fileAppender (file, layout, logSize, numBackups, level) {
       stream = new streams.RollingFileStream(
         file,
         fileSize,
-        numFiles
+        numFiles,
+        { "compress": compress }
       );
     } else {
       stream = fs.createWriteStream(
@@ -90,7 +91,7 @@ function configure(config, options) {
     config.filename = path.join(options.cwd, config.filename);
   }
 
-  return fileAppender(config.filename, layout, config.maxLogSize, config.backups, config.level);
+  return fileAppender(config.filename, layout, config.maxLogSize, config.backups, config.level, config.compress);
 }
 
 function shutdown(cb) {