it('should stringify with config4 file', async () => {
   const config4 = await readFile(path.resolve(__dirname, 'fixtures/ssh-config/config4'), { encoding: 'utf8' });
   const conf = SSHConfig.parse(config4);
   ensureHostAndKeyPath(conf, { host: 'bar' }, '/id_rsa');
   const s = config4.split('\n');
   s[s.length - 2] = '    IdentityFile /id_rsa';
   expect(SSHConfig.stringify(conf)).toEqual(s.join('\n'));
 });

function ensureHostSection(conf: SSHConfig.SSHConfig, host: string): SSHConfig.ConfigHostDirective {
  let section = findHostSection(conf, host);

  if (!section) {
    conf.push(SSHConfig.parse(`\nHost ${host}\n`)[0]);
    section = findHostSection(conf, host);
  }

  if (!section) {
    throw new Error(`Could not find/insert section for host: ${host}`);
  }

  return section;
}

function ensureSectionLine(section: SSHConfig.ConfigHostDirective, key: string, value: string): void {
  const found = section.config.some(line => {
    if (isDirective(line)) {
      if (line.param === key) {
        line.value = value;
        return true;
      }
    }

    return false;
  });

  if (!found) {
    section.config = section.config.concat(SSHConfig.parse(`${key} ${value}\n`));
  }
}

export async function loadFromPath(p: string): Promise<SSHConfig.SSHConfig> {
  const s = await fileToString(p);

  return SSHConfig.parse(s);
}