def GetVisualStudioVersion()

in build/vs_toolchain.py [0:0]

• 22 lines of code
• 11 McCabe index (conditional complexity)

def GetVisualStudioVersion():
  """Return best available version of Visual Studio.
  """

  env_version = os.environ.get('GYP_MSVS_VERSION')
  if env_version:
    return env_version

  supported_versions = list(MSVS_VERSIONS.keys())

  # VS installed in depot_tools for Googlers
  if bool(int(os.environ.get('DEPOT_TOOLS_WIN_TOOLCHAIN', '1'))):
    return list(supported_versions)[0]

  # VS installed in system for external developers
  supported_versions_str = ', '.join('{} ({})'.format(v,k)
      for k,v in list(MSVS_VERSIONS.items()))
  available_versions = []
  for version in supported_versions:
    for path in (
        os.environ.get('vs%s_install' % version),
        os.path.expandvars('%ProgramFiles(x86)%' +
                           '/Microsoft Visual Studio/%s' % version)):
      if path and os.path.exists(path):
        available_versions.append(version)
        break

  if not available_versions:
    raise Exception('No supported Visual Studio can be found.'
                    ' Supported versions are: %s.' % supported_versions_str)
  return available_versions[0]