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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import {
intoCallbackAPIWithIntercept,
MaybeEmpty,
notImplemented,
} from "../_utils.ts";
import { fromFileUrl } from "../path.ts";
type ReadlinkCallback = (
err: MaybeEmpty<Error>,
linkString: MaybeEmpty<string | Uint8Array>,
) => void;
interface ReadlinkOptions {
encoding?: string | null;
}
function maybeEncode(
data: string,
encoding: string | null,
): string | Uint8Array {
if (encoding === "buffer") {
return new TextEncoder().encode(data);
}
return data;
}
function getEncoding(
optOrCallback?: ReadlinkOptions | ReadlinkCallback,
): string | null {
if (!optOrCallback || typeof optOrCallback === "function") {
return null;
} else {
if (optOrCallback.encoding) {
if (
optOrCallback.encoding === "utf8" ||
optOrCallback.encoding === "utf-8"
) {
return "utf8";
} else if (optOrCallback.encoding === "buffer") {
return "buffer";
} else {
notImplemented();
}
}
return null;
}
}
export function readlink(
path: string | URL,
optOrCallback: ReadlinkCallback | ReadlinkOptions,
callback?: ReadlinkCallback,
): void {
path = path instanceof URL ? fromFileUrl(path) : path;
let cb: ReadlinkCallback | undefined;
if (typeof optOrCallback === "function") {
cb = optOrCallback;
} else {
cb = callback;
}
const encoding = getEncoding(optOrCallback);
intoCallbackAPIWithIntercept<string, Uint8Array | string>(
Deno.readLink,
(data: string): string | Uint8Array => maybeEncode(data, encoding),
cb,
path,
);
}
export function readlinkSync(
path: string | URL,
opt?: ReadlinkOptions,
): string | Uint8Array {
path = path instanceof URL ? fromFileUrl(path) : path;
return maybeEncode(Deno.readLinkSync(path), getEncoding(opt));
}
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