#!/usr/bin/env python
# Build the documentation.

from __future__ import print_function
import os, shutil, tempfile
from subprocess import check_call, CalledProcessError, Popen, PIPE

def pip_install(package, commit=None):
  "Install package using pip."
  if commit:
    cmd = ['pip', 'show', package.split('/')[1]]
    p = Popen(cmd, stdout=PIPE, stderr=PIPE)
    stdout, stderr = p.communicate()
    if p.returncode != 0:
      # Check if pip supports the show command.
      if 'No command by the name pip show' not in stderr:
        raise CalledProcessError(p.returncode, cmd)
    elif stdout:
      return # Already installed
    package = 'git+git://github.com/{0}.git@{1}'.format(package, commit)
  check_call(['pip', 'install', '-q', package])

def build_docs():
  # Create virtualenv.
  doc_dir = os.path.dirname(os.path.realpath(__file__))
  virtualenv_dir = os.path.join(doc_dir, 'virtualenv')
  check_call(['virtualenv', virtualenv_dir])
  activate_this_file = os.path.join(virtualenv_dir, 'bin', 'activate_this.py')
  execfile(activate_this_file, dict(__file__=activate_this_file))
  # Install Sphinx and Breathe.
  pip_install('sphinx==1.3.1')
  pip_install('michaeljones/breathe', '18bd461b4e29dde0adf5df4b3da7e5473e2c2983')
  # Build docs.
  cmd = ['doxygen', '-']
  p = Popen(cmd, stdin=PIPE, cwd=doc_dir)
  p.communicate(input=r'''
      PROJECT_NAME      = C++ Format
      GENERATE_LATEX    = NO
      GENERATE_MAN      = NO
      GENERATE_RTF      = NO
      CASE_SENSE_NAMES  = NO
      INPUT             = {0}/format.h
      QUIET             = YES
      JAVADOC_AUTOBRIEF = YES
      AUTOLINK_SUPPORT  = NO
      GENERATE_HTML     = NO
      GENERATE_XML      = YES
      XML_OUTPUT        = doxyxml
      ALIASES           = "rst=\verbatim embed:rst"
      ALIASES          += "endrst=\endverbatim"
      PREDEFINED        = _WIN32=1 \
                          FMT_USE_VARIADIC_TEMPLATES=1 \
                          FMT_USE_RVALUE_REFERENCES=1
      EXCLUDE_SYMBOLS   = fmt::internal::* StringValue write_str
    '''.format(os.path.dirname(doc_dir)))
  if p.returncode != 0:
    raise CalledProcessError(p.returncode, cmd)
  check_call(['sphinx-build', '-D', 'breathe_projects.format=doxyxml',
              '-b', 'html', '.', 'html'], cwd=doc_dir)
  check_call(['lessc', '--clean-css', '--include-path=bootstrap', 'cppformat.less',
              'html/_static/cppformat.css'], cwd=doc_dir)
  return os.path.join(doc_dir, 'html')

if __name__ == '__main__':
  build_docs()