Add -o/--output option.

lib/cli.js

@@ -119,6 +119,7 @@ function genFixForFile(file, config) {
   return function () {
     var content = fs.readFileSync(file).toString()
     var fixed = ''
+    var message = ''
 
     var fmjOptions = commander.indentPref
       ? fu.merge(config, { indentpref: commander.indentPref })
@@ -142,11 +143,14 @@ function genFixForFile(file, config) {
       printDiff(content, fixed)
     } else if (commander.patch) {
       createPatch(file, content, fixed)
+    } else if (commander.output) {
+      message = ' Saved to ' + path.basename(commander.output)
+      fs.writeFileSync(path.resolve(commander.output), fixed, 'utf8')
     } else {
       fs.writeFileSync(file, fixed, 'utf8')
     }
 
-    console.log('\u2713 ' + path.basename(file) + ' done.')
+    console.log('\u2713 ' + path.basename(file) + ' done.' + message)
 
     return content === fixed
   }
@@ -157,6 +161,9 @@ function traverseFiles(_, fileName) {
 
   switch (isDir(fullpath)) {
     case true:
+      if (commander.output) {
+        return []
+      }
       if (shouldIgnorePath(fullpath, _.ignore)) {
         return []
       }
@@ -210,6 +217,7 @@ commander
   .option('-n, --indent-pref [tabs|spaces]', 'Your indentation preference')
   .option('-p, --patch', 'Output a patch file to stdout')
   .option('-r, --dry-run', 'Performs a dry-run and shows you a diff')
+  .option('-o, --output <destination>', 'Specify output to a file')
   .option('-s, --silent', 'A useless option')
   .parse(process.argv)