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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
import * as msg from "gen/msg_generated";
import * as flatbuffers from "./flatbuffers";
import * as dispatch from "./dispatch";
/** 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.
*
* import { writeFileSync } from "deno";
*
* const encoder = new TextEncoder();
* const data = encoder.encode("Hello world\n");
* writeFileSync("hello.txt", data);
*/
export function writeFileSync(
filename: string,
data: Uint8Array,
options: WriteFileOptions = {}
): void {
dispatch.sendSync(...req(filename, data, options));
}
/** Write a new file, with given filename and data.
*
* import { writeFile } from "deno";
*
* const encoder = new TextEncoder();
* const data = encoder.encode("Hello world\n");
* await writeFile("hello.txt", data);
*/
export async function writeFile(
filename: string,
data: Uint8Array,
options: WriteFileOptions = {}
): Promise<void> {
await dispatch.sendAsync(...req(filename, data, options));
}
function req(
filename: string,
data: Uint8Array,
options: WriteFileOptions
): [flatbuffers.Builder, msg.Any, flatbuffers.Offset, Uint8Array] {
const builder = flatbuffers.createBuilder();
const filename_ = builder.createString(filename);
msg.WriteFile.startWriteFile(builder);
msg.WriteFile.addFilename(builder, filename_);
// Perm is not updated by default
if (options.perm !== undefined && options.perm !== null) {
msg.WriteFile.addUpdatePerm(builder, true);
msg.WriteFile.addPerm(builder, options.perm!);
} else {
msg.WriteFile.addUpdatePerm(builder, false);
msg.WriteFile.addPerm(builder, 0o666);
}
// Create is turned on by default
if (options.create !== undefined) {
msg.WriteFile.addIsCreate(builder, !!options.create);
} else {
msg.WriteFile.addIsCreate(builder, true);
}
msg.WriteFile.addIsAppend(builder, !!options.append);
const inner = msg.WriteFile.endWriteFile(builder);
return [builder, msg.Any.WriteFile, inner, data];
}
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