2022-10-01 22:18:26 +08:00
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# 命令行
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## 简介
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NocoBase Server Application 除了用作 WEB 服务器以外，也是个强大可扩展的 CLI 工具。
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新建一个 `app.js` 文件，代码如下：
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```ts
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const Application = require('@nocobase/server');
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// 此处省略具体配置
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const app = new Application({/*...*/});
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app.runAsCLI();
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```
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以 `runAsCLI()` 方式运行的 app.js 是一个 CLI，在命令行工具就可以像这样操作了：
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```bash
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node app.js install # 安装
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node app.js start # 启动
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```
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为了更好的开发、构建和部署 NocoBase 应用，NocoBase 内置了许多命令，详情查看 [NocoBase CLI](/api/cli) 章节。
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## 自定义 Command
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NocoBase CLI 的设计思想与 [Laravel Artisan](https://laravel.com/docs/9.x/artisan) 非常相似，都是可扩展的。NocoBase CLI 基于 [commander](https://www.npmjs.com/package/commander) 实现，可以这样扩展 Command：
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```ts
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app
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.command('echo')
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.option('-v, --version');
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.action(async ([options]) => {
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console.log('Hello World!');
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if (options.version) {
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console.log('Current version:', app.getVersion());
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}
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});
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```
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这个方法定义了以下命令：
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```bash
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yarn nocobase echo
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# Hello World!
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yarn nocobase echo -v
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# Hello World!
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# Current version: 0.7.4-alpha.7
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```
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更多 API 细节可参考 [Application.command()](/api/server/application#command) 部分。
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## 示例
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### 定义导出数据表的命令
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如果我们希望把应用的数据表中的数据导出成 JSON 文件，可以定义一个如下的子命令：
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```ts
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import path from 'path';
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import * as fs from 'fs/promises';
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class MyPlugin extends Plugin {
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load() {
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this.app
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.command('export')
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.option('-o, --output-dir')
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.action(async (options, ...collections) => {
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const { outputDir = path.join(process.env.PWD, 'storage') } = options;
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await collections.reduce((promise, collection) => promise.then(async () => {
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if (!this.db.hasCollection(collection)) {
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console.warn('No such collection:', collection);
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return;
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}
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const repo = this.db.getRepository(collection);
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const data = repo.find();
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await fs.writeFile(path.join(outputDir, `${collection}.json`), JSON.stringify(data), { mode: 0o644 });
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}), Promise.resolve());
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});
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}
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}
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```
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注册和激活插件之后在命令行调用：
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```bash
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mkdir -p ./storage/backups
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yarn nocobase export -o ./storage/backups users
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```
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执行后会生成 `./storage/backups/users.json` 文件包含数据表中的数据。
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## 小结
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本章所涉及示例代码整合在 [packages/samples/command](https://github.com/nocobase/nocobase/tree/main/packages/samples/command) 包中，可以直接在本地运行，查看效果。
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