microsoft/vscode-react-native
Publicmirrored from https://github.com/microsoft/vscode-react-nativeAvailable
src/utils/node/fileSystem.ts
66lines · modecode
| 1 | // Copyright (c) Microsoft Corporation. All rights reserved. |
| 2 | // Licensed under the MIT license. See LICENSE file in the project root for details. |
| 3 | |
| 4 | import * as fs from "fs"; |
| 5 | import * as Q from "q"; |
| 6 | |
| 7 | export class FileSystem { |
| 8 | |
| 9 | public ensureDirectory(dir: string): Q.Promise<void> { |
| 10 | return Q.nfcall(fs.stat, dir).then((stat: fs.Stats): void => { |
| 11 | if (stat.isDirectory()) { |
| 12 | return; |
| 13 | } else { |
| 14 | throw new Error(`Expected ${dir} to be a directory`); |
| 15 | } |
| 16 | }, (err: Error & {code?: string}): Q.Promise<any> => { |
| 17 | if (err && err.code === "ENOENT") { |
| 18 | return Q.nfcall(fs.mkdir, dir); |
| 19 | } else { |
| 20 | throw err; |
| 21 | } |
| 22 | }); |
| 23 | } |
| 24 | |
| 25 | public ensureFileWithContents(file: string, contents: string): Q.Promise<void> { |
| 26 | return Q.nfcall(fs.stat, file).then((stat: fs.Stats): void => { |
| 27 | if (!stat.isFile()) { |
| 28 | throw new Error(`Expected ${file} to be a file`); |
| 29 | } |
| 30 | // The file already exists, assume the contents are good and do not touch it. |
| 31 | }, (err: Error & {code?: string}): Q.Promise<any> => { |
| 32 | if (err && err.code === "ENOENT") { |
| 33 | return Q.nfcall(fs.writeFile, file, contents); |
| 34 | } else { |
| 35 | throw err; |
| 36 | } |
| 37 | }); |
| 38 | } |
| 39 | |
| 40 | public fileExistsSync(filename: string) { |
| 41 | try { |
| 42 | fs.lstatSync(filename); |
| 43 | return true; |
| 44 | } catch (error) { |
| 45 | return false; |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | public deleteFileIfExistsSync(filename: string) { |
| 50 | if (this.fileExistsSync(filename)) { |
| 51 | fs.unlinkSync(filename); |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | public readFile(filename: string, encoding: string = "utf8"): Q.Promise<string> { |
| 56 | throw new Error("To implement with Q.denodeify"); |
| 57 | } |
| 58 | |
| 59 | public writeFile(filename: string, data: any): Q.Promise<void> { |
| 60 | throw new Error("To implement with Q.denodeify"); |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | // We only copy these two methods, instead of all the methods of fs, because we need to remember to add the signatures manually |
| 65 | // to class FileSystem with a throw new Error("To implement with Q.denodeify"); implementation before adding it here |
| 66 | ["writeFile", "readFile"].forEach(methodName => (<any>FileSystem.prototype)[methodName] = Q.denodeify((<any>fs)[methodName])); |
| 67 | |