diff --git a/lib/wrench.js b/lib/wrench.js
index bcd7a39..1e8b145 100644
--- a/lib/wrench.js
+++ b/lib/wrench.js
@@ -120,6 +120,8 @@ exports.readdirRecursive = function(baseDir, fn) {
 
 
 
+
+
 /*  wrench.rmdirSyncRecursive("directory_path", forceDelete, failSilent);
  *
  *  Recursively dives through directories and obliterates everything about it. This is a
@@ -155,6 +157,55 @@ exports.rmdirSyncRecursive = function(path, failSilent) {
     return fs.rmdirSync(path);
 };
 
+
+
+function isFileIncluded(opts, dir, filename) {
+
+    function isMatch(filter) {
+        if (typeof filter === 'function') {
+            return filter(filename, dir) === true;
+        }
+        else {
+            // Maintain backwards compatibility and use just the filename
+            return filename.match(filter);
+        }
+    }
+
+    if (opts.include || opts.exclude) {
+        if (opts.exclude) {
+            if (isMatch(opts.exclude)) {
+                return false;
+            }
+        }
+
+        if (opts.include) {
+            if (isMatch(opts.include)) {
+                return true;
+            }
+            else  {
+                return false;
+            }
+        }
+
+        return true;
+    }
+    else if (opts.filter) {
+        var filter = opts.filter;
+
+        if (!opts.whitelist) {
+            // if !opts.whitelist is false every file or directory 
+            // which does match opts.filter will be ignored
+            return isMatch(filter) ? false : true;
+        } else {
+            // if opts.whitelist is true every file or directory 
+            // which doesn't match opts.filter will be ignored
+            return !isMatch(filter) ? false : true;
+        }
+    }
+
+    return true;
+}
+
 /*  wrench.copyDirSyncRecursive("directory_to_copy", "new_directory_location", opts);
  *
  *  Recursively dives through a directory and moves all its files to a new location. This is a
@@ -164,14 +215,16 @@ exports.rmdirSyncRecursive = function(path, failSilent) {
  *  Note: Directories should be passed to this function without a trailing slash.
  */
 exports.copyDirSyncRecursive = function(sourceDir, newDirLocation, opts) {
+    opts = opts || {};
+
     try {
-    	if(fs.statSync(newDirLocation).isDirectory()) { 
-    		if(typeof opts !== 'undefined' && opts.forceDelete) {
-			exports.rmdirSyncRecursive(newDirLocation);
-        	} else {
-	    		return new Error('You are trying to delete a directory that already exists. Specify forceDelete in the opts argument to override this. Bailing~');
-        	}
-    	}
+        if(fs.statSync(newDirLocation).isDirectory()) { 
+            if(typeof opts !== 'undefined' && opts.forceDelete) {
+            exports.rmdirSyncRecursive(newDirLocation);
+            } else {
+                return new Error('You are trying to delete a directory that already exists. Specify forceDelete in the opts argument to override this. Bailing~');
+            }
+        }
     } catch(e) { }
 
     /*  Create the directory where all our junk is moving to; read the mode of the source directory and mirror it */
@@ -184,13 +237,18 @@ exports.copyDirSyncRecursive = function(sourceDir, newDirLocation, opts) {
     }
 
     var files = fs.readdirSync(sourceDir);
+    var hasFilter = opts.filter || opts.include || opts.exclude;
+    var preserveFiles = opts.preserveFiles === true;
 
     for(var i = 0; i < files.length; i++) {
         // ignores all files or directories which match the RegExp in opts.filter
-		if(typeof opts !== 'undefined') {
-            if(!opts.whitelist && opts.filter && files[i].match(opts.filter)) continue;
-		    // if opts.whitelist is true every file or directory which doesn't match opts.filter will be ignored
-		    if(opts.whitelist && opts.filter && !files[i].match(opts.filter)) continue;
+        if(typeof opts !== 'undefined') {
+            if (hasFilter) {
+                if (!isFileIncluded(opts, sourceDir, files[i])) {
+                    continue;
+                }
+            }
+            
             if (opts.excludeHiddenUnix && /^\./.test(files[i])) continue;
         }
 
@@ -295,10 +353,15 @@ exports.rmdirRecursive = function rmdirRecursive(dir, failSilent, clbk){
 
     fs.readdir(dir, function(err, files) {
         if(err && typeof failSilent === 'boolean' && !failSilent) 
-		return clbk(err);
+        return clbk(err);
 
+<<<<<<< HEAD
         if(typeof failSilent === 'function')
             clbk = failSilent;
+=======
+    if(typeof failSilent === 'function')
+        clbk = failSilent;
+>>>>>>> 7827a700ff8cb8b742e401e9876e86a63ae0c68a
 
             (function rmFile(err){
                 if (err) return clbk(err);
@@ -333,6 +396,7 @@ exports.copyDirRecursive = function copyDirRecursive(srcDir, newDir, opts, clbk)
 
     fs.stat(newDir, function(err, newDirStat){
         if(!err) {
+<<<<<<< HEAD
 		if(typeof opts !== 'undefined' && typeof opts !== 'function' && opts.forceDelete)
 			return exports.rmdirRecursive(newDir, function(err) {
 				copyDirRecursive.apply(this, originalArguments);
@@ -343,6 +407,18 @@ exports.copyDirRecursive = function copyDirRecursive(srcDir, newDir, opts, clbk)
 
 	if(typeof opts === 'function')
 		clbk = opts;
+=======
+        if(typeof opts !== 'undefined' && typeof opts !== 'function' && opts.forceDelete)
+            return exports.rmdirRecursive(newDir, function(err){
+                copyDirRecursive.apply(this, arguments);
+                });
+        else
+            return clbk(new Error('You are trying to delete a directory that already exists. Specify forceDelete in an options object to override this.'));
+    }
+
+    if(typeof opts === 'function')
+        clbk = opts;
+>>>>>>> 7827a700ff8cb8b742e401e9876e86a63ae0c68a
 
         fs.stat(srcDir, function(err, srcDirStat){
             if (err) return clbk(err);
diff --git a/readme.md b/readme.md
index 5d573a5..a4e0242 100644
--- a/readme.md
+++ b/readme.md
@@ -66,10 +66,16 @@ wrench.copyDirSyncRecursive('directory_to_copy', 'location_where_copy_should_end
     excludeHiddenUnix: bool, // Whether to copy hidden Unix files or not (preceding .)
     preserveFiles: bool, // If we're overwriting something and the file already exists, keep the existing
     inflateSymlinks: bool, // Whether to follow symlinks or not when copying files
-    filter: regexp, // A filter to match files against; if matches, do nothing (exclude).
+    filter: regexpOrFunction, // A filter to match files against; if matches, do nothing (exclude).
     whitelist: bool, // if true every file or directory which doesn't match filter will be ignored
+    include: regexpOrFunction, // An include filter (either a regexp or a function)
+    exclude: regexpOrFunction // An exclude filter (either a regexp or a function)
 });
 
+// Note: If a RegExp is provided then then it will be matched against the filename. If a function is
+//       provided then the signature should be the following:
+//       function(filename, dir) { return result; }
+
 // Read lines in from a file until you hit the end
 var f = new wrench.LineReader('x.txt');
 while(f.hasNextLine()) {