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denoland-deno/js/stat.ts
2018-10-03 18:22:57 -04:00

77 lines
2.4 KiB
TypeScript

// Copyright 2018 the Deno authors. All rights reserved. MIT license.
import * as fbs from "gen/msg_generated";
import { flatbuffers } from "flatbuffers";
import * as dispatch from "./dispatch";
import { assert } from "./util";
import { FileInfo, FileInfoImpl } from "./fileinfo";
/**
* Queries the file system for information on the path provided.
* If the given path is a symlink information about the symlink will
* be returned.
*
* import { lstat } from "deno";
* const fileInfo = await lstat("hello.txt");
* assert(fileInfo.isFile());
*/
export async function lstat(filename: string): Promise<FileInfo> {
return res(await dispatch.sendAsync(...req(filename, true)));
}
/**
* Queries the file system for information on the path provided synchronously.
* If the given path is a symlink information about the symlink will
* be returned.
*
* import { lstatSync } from "deno";
* const fileInfo = lstatSync("hello.txt");
* assert(fileInfo.isFile());
*/
export function lstatSync(filename: string): FileInfo {
return res(dispatch.sendSync(...req(filename, true)));
}
/**
* Queries the file system for information on the path provided.
* `stat` Will always follow symlinks.
*
* import { stat } from "deno";
* const fileInfo = await stat("hello.txt");
* assert(fileInfo.isFile());
*/
export async function stat(filename: string): Promise<FileInfo> {
return res(await dispatch.sendAsync(...req(filename, false)));
}
/**
* Queries the file system for information on the path provided synchronously.
* `statSync` Will always follow symlinks.
*
* import { statSync } from "deno";
* const fileInfo = statSync("hello.txt");
* assert(fileInfo.isFile());
*/
export function statSync(filename: string): FileInfo {
return res(dispatch.sendSync(...req(filename, false)));
}
function req(
filename: string,
lstat: boolean
): [flatbuffers.Builder, fbs.Any, flatbuffers.Offset] {
const builder = new flatbuffers.Builder();
const filename_ = builder.createString(filename);
fbs.Stat.startStat(builder);
fbs.Stat.addFilename(builder, filename_);
fbs.Stat.addLstat(builder, lstat);
const msg = fbs.Stat.endStat(builder);
return [builder, fbs.Any.Stat, msg];
}
function res(baseRes: null | fbs.Base): FileInfo {
assert(baseRes != null);
assert(fbs.Any.StatRes === baseRes!.msgType());
const res = new fbs.StatRes();
assert(baseRes!.msg(res) != null);
return new FileInfoImpl(res);
}