helpers.js

const childProcess = require('child_process');
const path = require('path');

function $(command, options = {}) {
  let output;
  try {
    output = childProcess.execSync(command, { encoding: 'utf-8', ...options })
  } catch(error) {
    if (error.status) {
      exit(error.message);
    } else {
      throw error;
    }
  }

  if (Buffer.isBuffer(output)) {
    return output.toString().trim();;
  } else if (typeof output === 'string') {
    return output.trim();
  } else {
    return output;
  }
}

function $$(command, options = {}) {
  return $(command, { ...options, stdio: 'inherit' });
}

function getScriptName() {
  const [/*node*/, file] = process.argv;
  let name = path.basename(file, path.extname(file));
  if (name.startsWith('git-')) {
    name = name.substring(4);
  }
  return name;
}

function exit(message) {
  console.error(`${getScriptName()}: ${message}`);
  process.exit(1);
}

function graphql(query) {
  const fullQuery = `query { repository(owner:\\"{owner}\\", name:\\"{repo}\\") { ${query} } }`;
  const command = `hub api graphql -f query="${fullQuery}"`;

  let result;
  try {
    result = JSON.parse($(command));
  } catch(error) {
    exit(`failed to execute query: ${error}`)
  }

  if (typeof result !== 'object') {
    exit(`unexpected result ${result} from query`);
  } else if (result.hasOwnProperty('errors')) {
    exit(`query returned errors: ${JSON.stringify(result.errors)}`);
  } else if (typeof result.data !== 'object' || typeof result.data.repository !== 'object') {
    exit(`could not find repository data from query result`);
  } else {
    return result.data.repository;
  }
}

function toArray(listString) {
  if (!listString) {
    return [];
  }

  return listString.split(/\r?\n/);
}

module.exports = { $, $$, exit, graphql, toArray };