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walk.ts
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walk.ts
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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";
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,
};
}
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)) {
if (entry.isSymlink) {
if (followSymlinks) {
// TODO(ry) Re-enable followSymlinks.
throw new Error("unimplemented");
} else {
continue;
}
}
assert(entry.name != null);
const path = join(root, entry.name);
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)) {
if (entry.isSymlink) {
if (followSymlinks) {
throw new Error("unimplemented");
} else {
continue;
}
}
assert(entry.name != null);
const path = join(root, entry.name);
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,
});
}
}
}