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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.
const { readDir, readDirSync } = Deno;
type FileInfo = Deno.FileInfo;
import { unimplemented } from "../testing/asserts.ts";
import { join } from "./path/mod.ts";
export interface WalkOptions {
maxDepth?: number;
exts?: string[];
match?: RegExp[];
skip?: RegExp[];
onError?: (err: Error) => void;
followSymlinks?: boolean;
}
function patternTest(patterns: RegExp[], path: string): boolean {
// Forced to reset last index on regex while iterating for have
// consistent results.
// See: https://stackoverflow.com/a/1520853
return patterns.some(
(pattern): boolean => {
let r = pattern.test(path);
pattern.lastIndex = 0;
return r;
}
);
}
function include(filename: string, options: WalkOptions): boolean {
if (
options.exts &&
!options.exts.some((ext): boolean => filename.endsWith(ext))
) {
return false;
}
if (options.match && !patternTest(options.match, filename)) {
return false;
}
if (options.skip && patternTest(options.skip, filename)) {
return false;
}
return true;
}
export interface WalkInfo {
filename: string;
info: FileInfo;
}
/** Walks the file tree rooted at root, calling walkFn for each file or
* directory in the tree, including root. 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;
* - exts?: string[];
* - match?: RegExp[];
* - skip?: RegExp[];
* - onError?: (err: Error) => void;
* - followSymlinks?: boolean;
*
* for await (const { filename, info } of walk(".")) {
* console.log(filename);
* assert(info.isFile());
* };
*/
export async function* walk(
root: string,
options: WalkOptions = {}
): AsyncIterableIterator<WalkInfo> {
options.maxDepth! -= 1;
let ls: FileInfo[] = [];
try {
ls = await readDir(root);
} catch (err) {
if (options.onError) {
options.onError(err);
}
}
for (let info of ls) {
if (info.isSymlink()) {
if (options.followSymlinks) {
// TODO(ry) Re-enable followSymlinks.
unimplemented();
} else {
continue;
}
}
const filename = join(root, info.name!);
if (info.isFile()) {
if (include(filename, options)) {
yield { filename, info };
}
} else {
if (!(options.maxDepth! < 0)) {
yield* walk(filename, options);
}
}
}
}
/** Same as walk() but uses synchronous ops */
export function* walkSync(
root: string = ".",
options: WalkOptions = {}
): IterableIterator<WalkInfo> {
options.maxDepth! -= 1;
let ls: FileInfo[] = [];
try {
ls = readDirSync(root);
} catch (err) {
if (options.onError) {
options.onError(err);
}
}
for (let info of ls) {
if (info.isSymlink()) {
if (options.followSymlinks) {
unimplemented();
} else {
continue;
}
}
const filename = join(root, info.name!);
if (info.isFile()) {
if (include(filename, options)) {
yield { filename, info };
}
} else {
if (!(options.maxDepth! < 0)) {
yield* walkSync(filename, options);
}
}
}
}
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