text: #!/usr/bin/env python
  # Build the documentation.
  
  from __future__ import print_function
  import errno, os, shutil, sys, tempfile
  from subprocess import check_call, check_output, CalledProcessError, Popen, PIPE
  from distutils.version import LooseVersion
  
  versions = ['1.0.0', '1.1.0', '2.0.0', '3.0.2', '4.0.0', '4.1.0', '5.0.0', '5.1.0', '5.2.0', '5.2.1', '5.3.0', '6.0.0', '6.1.0', '6.1.1', '6.1.2', '6.2.0', '6.2.1', '7.0.0', '7.0.1']
  
  def pip_install(package, commit=None, **kwargs):
    "Install package using pip."
    min_version = kwargs.get('min_version')
    if min_version:
      from pkg_resources import get_distribution, DistributionNotFound
      try:
        installed_version = get_distribution(os.path.basename(package)).version
        if LooseVersion(installed_version) >= min_version:
          print('{} {} already installed'.format(package, min_version))
          return
      except DistributionNotFound:
        pass
    if commit:
      package = 'git+https://github.com/{0}.git@{1}'.format(package, commit)
    print('Installing {0}'.format(package))
    check_call(['pip', 'install', package])
  
  def create_build_env(dirname='virtualenv'):
    # Create virtualenv.
    if not os.path.exists(dirname):
      check_call(['virtualenv', dirname])
    import sysconfig
    scripts_dir = os.path.basename(sysconfig.get_path('scripts'))
    activate_this_file = os.path.join(dirname, scripts_dir, 'activate_this.py')
    with open(activate_this_file) as f:
      exec(f.read(), dict(__file__=activate_this_file))
    # Import get_distribution after activating virtualenv to get info about
    # the correct packages.
    from pkg_resources import get_distribution, DistributionNotFound
    # Upgrade pip because installation of sphinx with pip 1.1 available on Travis
    # is broken (see #207) and it doesn't support the show command.
    pip_version = get_distribution('pip').version
    if LooseVersion(pip_version) < LooseVersion('1.5.4'):
      print("Updating pip")
      check_call(['pip', 'install', '--upgrade', 'pip'])
    # Upgrade distribute because installation of sphinx with distribute 0.6.24
    # available on Travis is broken (see #207).
    try:
      distribute_version = get_distribution('distribute').version
      if LooseVersion(distribute_version) <= LooseVersion('0.6.24'):
        print("Updating distribute")
        check_call(['pip', 'install', '--upgrade', 'distribute'])
    except DistributionNotFound:
      pass
    # Install Sphinx and Breathe.
    pip_install('sphinx-doc/sphinx', '12b83372ac9316e8cbe86e7fed889296a4cc29ee',
                min_version='1.4.1.dev20160531')
    pip_install('michaeljones/breathe',
                '129222318f7c8f865d2631e7da7b033567e7f56a',
                min_version='4.2.0')
  
  def build_docs(sphinx_executable='sphinx-build', version='dev', **kwargs):
    doc_dir = kwargs.get('doc_dir', os.path.dirname(os.path.realpath(__file__)))
    work_dir = kwargs.get('work_dir', '.')
    include_dir = kwargs.get(
        'include_dir', os.path.join(os.path.dirname(doc_dir), 'include', 'fmt'))
    # Build docs.
    cmd = ['doxygen', '-']
    p = Popen(cmd, stdin=PIPE)
    doxyxml_dir = os.path.join(work_dir, 'doxyxml')
    p.communicate(input=r'''
        PROJECT_NAME      = fmt
        GENERATE_LATEX    = NO
        GENERATE_MAN      = NO
        GENERATE_RTF      = NO
        CASE_SENSE_NAMES  = NO
        INPUT             = {0}/color.h {0}/core.h {0}/compile.h {0}/format.h \
                            {0}/os.h {0}/ostream.h {0}/printf.h {0}/time.h
        QUIET             = YES
        JAVADOC_AUTOBRIEF = YES
        AUTOLINK_SUPPORT  = NO
        GENERATE_HTML     = NO
        GENERATE_XML      = YES
        XML_OUTPUT        = {1}
        ALIASES           = "rst=\verbatim embed:rst"
        ALIASES          += "endrst=\endverbatim"
        MACRO_EXPANSION   = YES
        PREDEFINED        = _WIN32=1 \
                            FMT_USE_VARIADIC_TEMPLATES=1 \
                            FMT_USE_RVALUE_REFERENCES=1 \
                            FMT_USE_USER_DEFINED_LITERALS=1 \
                            FMT_USE_ALIAS_TEMPLATES=1 \
                            FMT_API= \
                            "FMT_BEGIN_NAMESPACE=namespace fmt {{" \
                            "FMT_END_NAMESPACE=}}" \
                            "FMT_STRING_ALIAS=1" \
                            "FMT_ENABLE_IF(B)="
        EXCLUDE_SYMBOLS   = fmt::internal::* StringValue write_str
      '''.format(include_dir, doxyxml_dir).encode('UTF-8'))
    if p.returncode != 0:
      raise CalledProcessError(p.returncode, cmd)
    html_dir = os.path.join(work_dir, 'html')
    main_versions = reversed(versions[-3:])
    check_call([sphinx_executable,
                '-Dbreathe_projects.format=' + os.path.abspath(doxyxml_dir),
                '-Dversion=' + version, '-Drelease=' + version,
                '-Aversion=' + version, '-Aversions=' + ','.join(main_versions),
                '-b', 'html', doc_dir, html_dir])
    try:
      check_call(['lessc', '--clean-css',
                  '--include-path=' + os.path.join(doc_dir, 'bootstrap'),
                  os.path.join(doc_dir, 'fmt.less'),
                  os.path.join(html_dir, '_static', 'fmt.css')])
    except OSError as e:
      if e.errno != errno.ENOENT:
        raise
      print('lessc not found; make sure that Less (http://lesscss.org/) ' +
            'is installed')
      sys.exit(1)
    return html_dir
  
  if __name__ == '__main__':
    create_build_env()
    build_docs(sys.argv[1], sys.argv[2])
  