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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import { stat, statSync } from "./stat.ts";
import { open, openSync } from "./files.ts";
import { chmod, chmodSync } from "./chmod.ts";
import { writeAll, writeAllSync } from "./buffer.ts";
/** Options for writing to a file.
* `perm` would change the file's permission if set.
* `create` decides if the file should be created if not exists (default: true)
* `append` decides if the file should be appended (default: false)
*/
export interface WriteFileOptions {
perm?: number;
create?: boolean;
append?: boolean;
}
/** Write a new file, with given filename and data synchronously.
*
* const encoder = new TextEncoder();
* const data = encoder.encode("Hello world\n");
* Deno.writeFileSync("hello.txt", data);
*/
export function writeFileSync(
filename: string,
data: Uint8Array,
options: WriteFileOptions = {}
): void {
if (options.create !== undefined) {
const create = !!options.create;
if (!create) {
// verify that file exists
statSync(filename);
}
}
const openMode = !!options.append ? "a" : "w";
const file = openSync(filename, openMode);
if (options.perm !== undefined && options.perm !== null) {
chmodSync(filename, options.perm);
}
writeAllSync(file, data);
file.close();
}
/** Write a new file, with given filename and data.
*
* const encoder = new TextEncoder();
* const data = encoder.encode("Hello world\n");
* await Deno.writeFile("hello.txt", data);
*/
export async function writeFile(
filename: string,
data: Uint8Array,
options: WriteFileOptions = {}
): Promise<void> {
if (options.create !== undefined) {
const create = !!options.create;
if (!create) {
// verify that file exists
await stat(filename);
}
}
const openMode = !!options.append ? "a" : "w";
const file = await open(filename, openMode);
if (options.perm !== undefined && options.perm !== null) {
await chmod(filename, options.perm);
}
await writeAll(file, data);
file.close();
}
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