add option to skip special files (#15)

* add option to skip special files

* use stat object

* check if directly, make sure we have a.stat first

README.md

@@ -36,8 +36,9 @@ Options include:
   dereference: false, // dereference any symlinks
   equals: fun, // optional function to determine if two entries are the same, see below
   ignore: null, // optional function to ignore file paths on src or dest
-  dryRun: false // emit all events but don't write/del files,
-  keepExisting: false // whether to delete extra files in the destination that are not present in the source
+  dryRun: false, // emit all events but don't write/del files,
+  keepExisting: false, // whether to delete extra files in the destination that are not present in the source
+  skipSpecial: true // skip any files that are not regular files
 }
 ```
 

index.js

@@ -9,6 +9,7 @@ module.exports = mirror
 function mirror (src, dst, opts, cb) {
   if (typeof opts === 'function') return mirror(src, dst, null, opts)
   if (!opts) opts = {}
+  if (opts.skipSpecial !== false) opts.skipSpecial = true
 
   var progress = new events.EventEmitter()
   progress.destroy = destroy
@@ -89,6 +90,11 @@ function mirror (src, dst, opts, cb) {
         // copy to b
         if (a.stat && !b.stat) return put(a, b, next)
 
+        if (!a.stat.isDirectory() && opts.skipSpecial && !a.stat.isFile()) {
+          progress.emit('skip', a, b)
+          return next()
+        }
+
         // check if they are the same
         equals(a, b, function (err, same) {
           if (err) throw err