1 files changed, 40 insertions, 0 deletions
diff --git a/tools/util.ts b/tools/util.ts
new file mode 100644
index 000000000..5ff7da344
--- /dev/null
+++ b/tools/util.ts
@@ -0,0 +1,40 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import { lstatSync, readDirSync } from "deno";
+
+export interface FindOptions {
+  skip?: string[];
+  depth?: number;
+}
+
+/**
+ * Finds files of the give extensions under the given paths recursively.
+ * @param dirs directories
+ * @param exts extensions
+ * @param skip patterns to ignore
+ * @param depth depth to find
+ */
+export function findFiles(
+  dirs: string[],
+  exts: string[],
+  { skip = [], depth = 20 }: FindOptions = {}
+) {
+  return findFilesWalk(dirs, depth).filter(
+    path =>
+      exts.some(ext => path.endsWith(ext)) &&
+      skip.every(pattern => !path.includes(pattern))
+  );
+}
+
+function findFilesWalk(paths: string[], depth: number) {
+  if (depth < 0) {
+    return [];
+  }
+
+  const foundPaths = paths.map(path =>
+    lstatSync(path).isDirectory()
+      ? findFilesWalk(readDirSync(path).map(f => f.path), depth - 1)
+      : path
+  );
+
+  return [].concat(...foundPaths);
+}