Add ignore option

README.md

@@ -79,6 +79,14 @@ entry.isDirectory() // => true if directory
     // => ['one.txt', 'subdir/two.txt']
     ```
 
+* `ignore`: An array of globs. Files and directories that match at least one
+  of the provided globs will be pruned while searching.
+
+    ```js
+    var paths = walkSync('project', { ignore: ['subdir'] })
+    // => ['one.txt']
+    ```
+
 ## Background
 
 `walkSync(baseDir)` is a faster substitute for

index.js

@@ -45,20 +45,30 @@ function _walkSync(baseDir, options, _relativePath) {
   // https://github.com/joyent/node/pull/6929
   var relativePath = handleRelativePath(_relativePath);
   var globs = options.globs;
-  var m;
+  var ignorePatterns = options.ignore;
+  var globMatcher, ignoreMatcher;
+  var results = [];
+
+  if (ignorePatterns) {
+    ignoreMatcher = new MatcherCollection(ignorePatterns);
+  }
 
   if (globs) {
-    m = new MatcherCollection(globs);
+    globMatcher = new MatcherCollection(globs);
   }
 
-  var results = [];
-  if (m && !m.mayContain(relativePath)) {
+  if (globMatcher && !globMatcher.mayContain(relativePath)) {
     return results;
   }
 
   var names = fs.readdirSync(baseDir + '/' + relativePath);
   var entries = names.map(function (name) {
     var entryRelativePath = relativePath + name;
+
+    if (ignoreMatcher && ignoreMatcher.match(entryRelativePath)) {
+      return;
+    }
+
     var fullPath = baseDir + '/' + entryRelativePath;
     var stats = getStat(fullPath);
 
@@ -86,12 +96,12 @@ function _walkSync(baseDir, options, _relativePath) {
     var entry = sortedEntries[i];
 
     if (entry.isDirectory()) {
-      if (options.directories !== false && (!m || m.match(entry.relativePath))) {
+      if (options.directories !== false && (!globMatcher || globMatcher.match(entry.relativePath))) {
         results.push(entry);
       }
       results = results.concat(_walkSync(baseDir, options, entry.relativePath));
     } else {
-      if (!m || m.match(entry.relativePath)) {
+      if (!globMatcher || globMatcher.match(entry.relativePath)) {
         results.push(entry);
       }
     }

test/test.js

@@ -231,3 +231,45 @@ test('walkSync with matchers', function (t) {
 
   t.end();
 });
+
+test('walksync with ignore pattern', function (t) {
+  t.deepEqual(walkSync('test/fixtures', {
+    ignore: ['dir']
+  }), [
+    'foo.txt',
+    'foo/',
+    'foo/a.js',
+    'some-other-dir/',
+    'some-other-dir/qux.txt',
+    'symlink1/',
+    'symlink1/qux.txt',
+    'symlink2'
+  ]);
+
+  t.deepEqual(walkSync('test/fixtures', {
+    ignore: ['**/subdir']
+  }), [
+    'dir/',
+    'dir/bar.txt',
+    'dir/zzz.txt',
+    'foo.txt',
+    'foo/',
+    'foo/a.js',
+    'some-other-dir/',
+    'some-other-dir/qux.txt',
+    'symlink1/',
+    'symlink1/qux.txt',
+    'symlink2'
+  ]);
+
+  t.deepEqual(walkSync('test/fixtures', {
+    globs: ['**/*.txt'],
+    ignore: ['dir']
+  }), [
+    'foo.txt',
+    'some-other-dir/qux.txt',
+    'symlink1/qux.txt'
+  ]);
+
+  t.end();
+});