foster/denoland-deno
1
0
Fork 0
mirror of https://github.com/denoland/deno.git synced 2024-12-24 08:09:08 -05:00
Code Issues Packages 1 Wiki Activity

feat(runtime): add truncate and truncateSync methods to Deno.File (#10130)

Browse source
This commit is contained in:
Casper Beyer 2021-04-12 20:32:58 +08:00 committed by GitHub
parent da9219341f
commit 9d53dab4df
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
3 changed files with 55 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
cli/dts/lib.deno.ns.d.ts vendored
View file

@ -781,6 +781,8 @@ declare namespace Deno {
constructor(rid: number);
write(p: Uint8Array): Promise<number>;
writeSync(p: Uint8Array): number;
truncate(len?: number): void;
truncateSync(len?: number): Promise<void>;
read(p: Uint8Array): Promise<number | null>;
readSync(p: Uint8Array): number | null;
seek(offset: number, whence: SeekMode): Promise<number>;

44
cli/tests/unit/file_test.ts
View file

@ -104,6 +104,50 @@ unitTest(function fileUsingEmptyStringFileName(): void {
testSecondArgument("", "");
});
unitTest(
{ perms: { read: true, write: true } },
function fileTruncateSyncSuccess(): void {
const filename = Deno.makeTempDirSync() + "/test_fileTruncateSync.txt";
const file = Deno.openSync(filename, {
create: true,
read: true,
write: true,
});
file.truncateSync(20);
assertEquals(Deno.readFileSync(filename).byteLength, 20);
file.truncateSync(5);
assertEquals(Deno.readFileSync(filename).byteLength, 5);
file.truncateSync(-5);
assertEquals(Deno.readFileSync(filename).byteLength, 0);
file.close();
Deno.removeSync(filename);
},
);
unitTest(
{ perms: { read: true, write: true } },
async function fileTruncateSuccess(): Promise<void> {
const filename = Deno.makeTempDirSync() + "/test_fileTruncate.txt";
const file = await Deno.open(filename, {
create: true,
read: true,
write: true,
});
await file.truncate(20);
assertEquals((await Deno.readFile(filename)).byteLength, 20);
await file.truncate(5);
assertEquals((await Deno.readFile(filename)).byteLength, 5);
await file.truncate(-5);
assertEquals((await Deno.readFile(filename)).byteLength, 0);
file.close();
await Deno.remove(filename);
},
);
unitTest({ perms: { read: true } }, function fileStatSyncSuccess(): void {
const file = Deno.openSync("README.md");
const fileInfo = file.statSync();

10
runtime/js/40_files.js
View file

@ -4,7 +4,7 @@
((window) => {
const core = window.Deno.core;
const { read, readSync, write, writeSync } = window.__bootstrap.io;
const { fstat, fstatSync } = window.__bootstrap.fs;
const { ftruncate, ftruncateSync, fstat, fstatSync } = window.__bootstrap.fs;
const { pathFromURL } = window.__bootstrap.util;
function seekSync(
@ -88,6 +88,14 @@
return writeSync(this.rid, p);
}
truncate(len) {
return ftruncate(this.rid, len);
}
truncateSync(len) {
return ftruncateSync(this.rid, len);
}
read(p) {
return read(this.rid, p);
}