1
0
Fork 0
mirror of https://github.com/denoland/deno.git synced 2024-12-13 02:52:54 -05:00
denoland-deno/js/truncate.ts

42 lines
1.3 KiB
TypeScript
Raw Normal View History

2018-09-30 15:06:20 -04:00
// Copyright 2018 the Deno authors. All rights reserved. MIT license.
2018-10-03 21:18:23 -04:00
import * as msg from "gen/msg_generated";
import * as flatbuffers from "./flatbuffers";
2018-09-30 15:06:20 -04:00
import * as dispatch from "./dispatch";
2018-10-14 16:29:50 -04:00
/** Truncates or extends the specified file synchronously, updating the size of
* this file to become size.
2018-09-30 15:06:20 -04:00
*
2018-10-14 16:29:50 -04:00
* import { truncateSync } from "deno";
2018-09-30 15:06:20 -04:00
*
2018-10-14 16:29:50 -04:00
* truncateSync("hello.txt", 10);
2018-09-30 15:06:20 -04:00
*/
export function truncateSync(name: string, len?: number): void {
dispatch.sendSync(...req(name, len));
}
/**
2018-10-14 16:29:50 -04:00
* Truncates or extends the specified file, updating the size of this file to
* become size.
2018-09-30 15:06:20 -04:00
*
2018-10-14 16:29:50 -04:00
* import { truncate } from "deno";
2018-09-30 15:06:20 -04:00
*
2018-10-14 16:29:50 -04:00
* await truncate("hello.txt", 10);
2018-09-30 15:06:20 -04:00
*/
export async function truncate(name: string, len?: number): Promise<void> {
await dispatch.sendAsync(...req(name, len));
}
function req(
name: string,
len?: number
2018-10-03 21:18:23 -04:00
): [flatbuffers.Builder, msg.Any, flatbuffers.Offset] {
const builder = flatbuffers.createBuilder();
2018-09-30 15:06:20 -04:00
const name_ = builder.createString(name);
len = len && len > 0 ? Math.floor(len) : 0;
2018-10-03 21:18:23 -04:00
msg.Truncate.startTruncate(builder);
msg.Truncate.addName(builder, name_);
msg.Truncate.addLen(builder, len);
const inner = msg.Truncate.endTruncate(builder);
return [builder, msg.Any.Truncate, inner];
2018-09-30 15:06:20 -04:00
}