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denoland-deno/js/truncate.ts
Ryan Dahl c9614d86c1
Move //libdeno to //core/libdeno (#2015)
Fixes some sed errors introduced in c43cfe.

Unfortunately moving libdeno required splitting build.rs into two parts,
one for cli and one for core.

I've also removed the arm64 build - it's complicating things at this
re-org and we're not even testing it. I need to swing back to it and get
tools/test.py running for it.
2019-03-30 14:45:36 -04:00

37 lines
1.2 KiB
TypeScript

// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
import * as msg from "gen/cli/msg_generated";
import * as flatbuffers from "./flatbuffers";
import * as dispatch from "./dispatch";
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];
}
/** Truncates or extends the specified file synchronously, updating the size of
* this file to become size.
*
* 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.
*
* await Deno.truncate("hello.txt", 10);
*/
export async function truncate(name: string, len?: number): Promise<void> {
await dispatch.sendAsync(...req(name, len));
}