templates.ts

import prompts from 'prompts';
import got from 'got';
import { checkGithubAuth } from './utils';

const TEMPLATES_REPO_ID='270079803';

// https://github.com/aws-samples/aws-cdk-examples?files=1
const exampleLanguages = [
  'typescript',
  'python',
  'java',
  'csharp'
];

async function listRepoPath(repoId: string, path: string): Promise<any> {
  const options = {};
  const auth = checkGithubAuth();
  if (auth) {
    Object.assign(options, auth);
  }
  const endpoint = `https://api.github.com/repositories/${repoId}/${path}`;
  const res = await got(endpoint, options);
  return JSON.parse(res.body);
}

async function listTemplates(): Promise<any> {
  try {
    return listRepoPath(TEMPLATES_REPO_ID, `contents/templates`);
  } catch (e) {
    console.error(`Failed to list templates`);
    process.exit(1);
  }
}

async function chooseTemplate() {
  const choices = await listTemplates();
  const example = await prompts({
    type: 'select',
    name: 'value',
    message: 'Select template',
    choices: choices.map((choice: any) => {
      return {
        title: choice.name,
        value: choice.name
      }
    })
  });
  
  if (!example.value) {
    console.log('Please specify a template');
    process.exit(1);
  }

  return example.value;
}

export async function chooseLanguage(): Promise<string> {
  const language = await prompts({
    type: 'select',
    name: 'value',
    message: 'Pick a language',
    choices: exampleLanguages.map(language => {
      return {
        title: language,
        value: language
      }
    })
  });
  
  if (!language.value) {
    console.log('Please specify the language');
    process.exit(1);
  }
  
  return language.value;
}

export async function promptForTemplate(): Promise<string> {
  const template = await prompts({
    type: 'select',
    name: 'value',
    message: 'Pick a template',
    choices: [
      { title: 'Default cdk app', value: 'cdk-init' },
      { title: 'Example from the cdk-tools/templates repo', value: 'templates' }
    ],
  });

  if (!template.value) {
    console.log('Please specify a template');
    process.exit(1);
  }

  let choice: string;
  if (template.value === 'cdk-init') {
    choice = 'cdk-init';
  } else if (template.value === 'templates') {
    choice = `templates/${await chooseTemplate()}`;
  } else {
    console.error(`Unknown template: ${template.value}`);
    process.exit(0);
  }

  return choice;
}