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// Copyright 2018 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";
/** Truncates or extends the specified file synchronously, updating the size of
* this file to become size.
*
* import { truncateSync } from "deno";
*
* truncateSync("hello.txt", 10);
*/
export function truncateSync(name: string, len?: number): void {
dispatch.sendSync(...req(name, len));
}
/**
* Truncates or extends the specified file, updating the size of this file to
* become size.
*
* import { truncate } from "deno";
*
* await truncate("hello.txt", 10);
*/
export async function truncate(name: string, len?: number): Promise<void> {
await dispatch.sendAsync(...req(name, len));
}
function req(
name: string,
len?: number
): [flatbuffers.Builder, msg.Any, flatbuffers.Offset] {
const builder = flatbuffers.createBuilder();
const name_ = builder.createString(name);
len = len && len > 0 ? Math.floor(len) : 0;
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];
}
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