# nest js command line script

- console.ts

// console.ts
import { NestFactory } from '@nestjs/core';
import { AppModule } from './app.module';
import { UserTask } from './tasks/user.task';

async function bootstrap() {
  const application = await NestFactory.createApplicationContext(
    AppModule,
  );

  const command_prefix = process.argv[2].split(':')[0];
  const command = process.argv[2].split(':')[1];
  const argv = process.argv.filter((v, index) => index > 1);

  try {
    switch (command_prefix) {
      case 'user':
        const task = new UserTask(application)
        console.log(await task[command](argv));
        break;
      default:
        console.log('Command not found');
        process.exit(1);
    }
  } catch(err: unknown) {
    if (err instanceof TypeError) {
      console.log('Command not found')
    } else {
      console.log(err);
    }
  }

  await application.close();
  process.exit(0);
}

bootstrap();

- user.task.ts

import { UserService } from '../user/user.service';

export class FinMindTask {
  private readonly service: UserService;
  constructor(app) {
    this.service = app.get(UserService)
  }

  async generateExcel(): Promise<any> {
    return this.service.generateExcel();
  }
}

- package.json

{
    "scripts": {
        "execute": "ts-node -r tsconfig-paths/register ./src/console.ts"   
    }
}

接下來就可以用

`$ npm run execute user:generateExcel`
來透過指令執行 service 內的東西