microsoft/vscode-react-native
Publicmirrored fromhttps://github.com/microsoft/vscode-react-nativeAvailable
src/common/node/fileSystem.ts
181lines · 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 nodeFs from "fs"; |
| 5 | import * as path from "path"; |
| 6 | |
| 7 | export class FileSystem { |
| 8 | private fs: typeof nodeFs; |
| 9 | |
| 10 | constructor({ fs = nodeFs } = {}) { |
| 11 | this.fs = fs; |
| 12 | } |
| 13 | |
| 14 | public ensureDirectory(dir: string): Promise<void> { |
| 15 | return this.stat(dir).then( |
| 16 | (stat: nodeFs.Stats): void => { |
| 17 | if (stat.isDirectory()) { |
| 18 | return; |
| 19 | } |
| 20 | throw new Error(`Expected ${dir} to be a directory`); |
| 21 | }, |
| 22 | (err: Error & { code?: string }): Promise<any> => { |
| 23 | if (err && err.code === "ENOENT") { |
| 24 | return this.mkDir(dir); |
| 25 | } |
| 26 | throw err; |
| 27 | }, |
| 28 | ); |
| 29 | } |
| 30 | |
| 31 | public ensureFileWithContents(file: string, contents: string): Promise<void> { |
| 32 | return this.stat(file).then( |
| 33 | (stat: nodeFs.Stats) => { |
| 34 | if (!stat.isFile()) { |
| 35 | throw new Error(`Expected ${file} to be a file`); |
| 36 | } |
| 37 | |
| 38 | return this.readFile(file).then(existingContents => { |
| 39 | if (contents !== existingContents) { |
| 40 | return this.writeFile(file, contents); |
| 41 | } |
| 42 | return Promise.resolve(); |
| 43 | }); |
| 44 | }, |
| 45 | (err: Error & { code?: string }): Promise<any> => { |
| 46 | if (err && err.code === "ENOENT") { |
| 47 | return this.writeFile(file, contents); |
| 48 | } |
| 49 | throw err; |
| 50 | }, |
| 51 | ); |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Helper function to check if a file or directory exists |
| 56 | */ |
| 57 | public existsSync(filename: string): boolean { |
| 58 | return this.fs.existsSync(filename); |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * Helper (asynchronous) function to check if a file or directory exists |
| 63 | */ |
| 64 | public exists(filename: string): Promise<boolean> { |
| 65 | return this.stat(filename) |
| 66 | .then(() => { |
| 67 | return Promise.resolve(true); |
| 68 | }) |
| 69 | .catch(() => { |
| 70 | return Promise.resolve(false); |
| 71 | }); |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * Helper async function to read the contents of a directory |
| 76 | */ |
| 77 | public readDir(directory: string): Promise<string[]> { |
| 78 | return this.fs.promises.readdir(directory); |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Helper (synchronous) function to create a directory recursively |
| 83 | */ |
| 84 | public makeDirectoryRecursiveSync(dirPath: string): void { |
| 85 | let parentPath = path.dirname(dirPath); |
| 86 | if (!this.existsSync(parentPath)) { |
| 87 | this.makeDirectoryRecursiveSync(parentPath); |
| 88 | } |
| 89 | |
| 90 | this.fs.mkdirSync(dirPath); |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * Helper function to asynchronously copy a file |
| 95 | */ |
| 96 | public copyFile(from: string, to: string): Promise<void> { |
| 97 | return this.fs.promises.copyFile(from, to); |
| 98 | } |
| 99 | |
| 100 | public deleteFileIfExistsSync(filename: string): void { |
| 101 | if (this.existsSync(filename)) { |
| 102 | this.fs.unlinkSync(filename); |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | public readFile(filename: string, encoding: string = "utf8"): Promise<string | Buffer> { |
| 107 | return this.fs.promises.readFile(filename, { encoding }); |
| 108 | } |
| 109 | |
| 110 | public writeFile(filename: string, data: any): Promise<void> { |
| 111 | return this.fs.promises.writeFile(filename, data); |
| 112 | } |
| 113 | |
| 114 | public unlink(filename: string): Promise<void> { |
| 115 | return this.fs.promises.unlink(filename); |
| 116 | } |
| 117 | |
| 118 | public mkDir(p: string): Promise<void> { |
| 119 | return this.fs.promises.mkdir(p); |
| 120 | } |
| 121 | |
| 122 | public stat(fsPath: string): Promise<nodeFs.Stats> { |
| 123 | return this.fs.promises.stat(fsPath); |
| 124 | } |
| 125 | |
| 126 | public directoryExists(directoryPath: string): Promise<boolean> { |
| 127 | return this.stat(directoryPath) |
| 128 | .then(stats => { |
| 129 | return stats.isDirectory(); |
| 130 | }) |
| 131 | .catch(reason => { |
| 132 | return reason.code === "ENOENT" ? false : Promise.reject<boolean>(reason); |
| 133 | }); |
| 134 | } |
| 135 | |
| 136 | /** |
| 137 | * Delete 'dirPath' if it's an empty folder. If not fail. |
| 138 | * |
| 139 | * @param {dirPath} path to the folder |
| 140 | * @returns {void} Nothing |
| 141 | */ |
| 142 | public rmdir(dirPath: string): Promise<void> { |
| 143 | return this.fs.promises.rmdir(dirPath); |
| 144 | } |
| 145 | |
| 146 | public async removePathRecursivelyAsync(p: string): Promise<void> { |
| 147 | const exists = await this.exists(p); |
| 148 | if (exists) { |
| 149 | const stats = await this.stat(p); |
| 150 | if (stats.isDirectory()) { |
| 151 | const childPaths = await this.readDir(p); |
| 152 | await Promise.all( |
| 153 | childPaths.map(childPath => |
| 154 | this.removePathRecursivelyAsync(path.join(p, childPath)), |
| 155 | ), |
| 156 | ); |
| 157 | await this.rmdir(p); |
| 158 | } else { |
| 159 | /* file */ |
| 160 | return this.unlink(p); |
| 161 | } |
| 162 | } |
| 163 | return Promise.resolve(); |
| 164 | } |
| 165 | |
| 166 | public removePathRecursivelySync(p: string): void { |
| 167 | if (this.fs.existsSync(p)) { |
| 168 | let stats = this.fs.statSync(p); |
| 169 | if (stats.isDirectory()) { |
| 170 | let contents = this.fs.readdirSync(p); |
| 171 | contents.forEach(childPath => |
| 172 | this.removePathRecursivelySync(path.join(p, childPath)), |
| 173 | ); |
| 174 | this.fs.rmdirSync(p); |
| 175 | } else { |
| 176 | /* file */ |
| 177 | this.fs.unlinkSync(p); |
| 178 | } |
| 179 | } |
| 180 | } |
| 181 | } |
| 182 | |