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// Documentation and interface for walk were adapted from Go// https://golang.org/pkg/path/filepath/#Walk// Copyright 2009 The Go Authors. All rights reserved. BSD license.import { assert } from "../_util/assert.ts";import { basename, join, normalize } from "../path/mod.ts";
/** Create WalkEntry for the `path` synchronously */export function _createWalkEntrySync(path: string): WalkEntry {  path = normalize(path);  const name = basename(path);  const info = Deno.statSync(path);  return {    path,    name,    isFile: info.isFile,    isDirectory: info.isDirectory,    isSymlink: info.isSymlink,  };}
/** Create WalkEntry for the `path` asynchronously */export async function _createWalkEntry(path: string): Promise<WalkEntry> {  path = normalize(path);  const name = basename(path);  const info = await Deno.stat(path);  return {    path,    name,    isFile: info.isFile,    isDirectory: info.isDirectory,    isSymlink: info.isSymlink,  };}
export interface WalkOptions {  maxDepth?: number;  includeFiles?: boolean;  includeDirs?: boolean;  followSymlinks?: boolean;  exts?: string[];  match?: RegExp[];  skip?: RegExp[];}
function include(  path: string,  exts?: string[],  match?: RegExp[],  skip?: RegExp[],): boolean {  if (exts && !exts.some((ext): boolean => path.endsWith(ext))) {    return false;  }  if (match && !match.some((pattern): boolean => !!path.match(pattern))) {    return false;  }  if (skip && skip.some((pattern): boolean => !!path.match(pattern))) {    return false;  }  return true;}
export interface WalkEntry extends Deno.DirEntry {  path: string;}
/** Walks the file tree rooted at root, yielding each file or directory in the * tree filtered according to the given options. The files are walked in lexical * order, which makes the output deterministic but means that for very large * directories walk() can be inefficient. * * Options: * - maxDepth?: number = Infinity; * - includeFiles?: boolean = true; * - includeDirs?: boolean = true; * - followSymlinks?: boolean = false; * - exts?: string[]; * - match?: RegExp[]; * - skip?: RegExp[]; * * *       for await (const entry of walk(".")) { *         console.log(entry.path); *         assert(entry.isFile); *       } */export async function* walk(  root: string,  {    maxDepth = Infinity,    includeFiles = true,    includeDirs = true,    followSymlinks = false,    exts = undefined,    match = undefined,    skip = undefined,  }: WalkOptions = {},): AsyncIterableIterator<WalkEntry> {  if (maxDepth < 0) {    return;  }  if (includeDirs && include(root, exts, match, skip)) {    yield await _createWalkEntry(root);  }  if (maxDepth < 1 || !include(root, undefined, undefined, skip)) {    return;  }  for await (const entry of Deno.readDir(root)) {    assert(entry.name != null);    let path = join(root, entry.name);
    if (entry.isSymlink) {      if (followSymlinks) {        path = await Deno.realPath(path);      } else {        continue;      }    }
    if (entry.isFile) {      if (includeFiles && include(path, exts, match, skip)) {        yield { path, ...entry };      }    } else {      yield* walk(path, {        maxDepth: maxDepth - 1,        includeFiles,        includeDirs,        followSymlinks,        exts,        match,        skip,      });    }  }}
/** Same as walk() but uses synchronous ops */export function* walkSync(  root: string,  {    maxDepth = Infinity,    includeFiles = true,    includeDirs = true,    followSymlinks = false,    exts = undefined,    match = undefined,    skip = undefined,  }: WalkOptions = {},): IterableIterator<WalkEntry> {  if (maxDepth < 0) {    return;  }  if (includeDirs && include(root, exts, match, skip)) {    yield _createWalkEntrySync(root);  }  if (maxDepth < 1 || !include(root, undefined, undefined, skip)) {    return;  }  for (const entry of Deno.readDirSync(root)) {    assert(entry.name != null);    let path = join(root, entry.name);
    if (entry.isSymlink) {      if (followSymlinks) {        path = Deno.realPathSync(path);      } else {        continue;      }    }
    if (entry.isFile) {      if (includeFiles && include(path, exts, match, skip)) {        yield { path, ...entry };      }    } else {      yield* walkSync(path, {        maxDepth: maxDepth - 1,        includeFiles,        includeDirs,        followSymlinks,        exts,        match,        skip,      });    }  }}