# -*- coding: utf-8 -*-
"""
    sphinx.setup_command
    ~~~~~~~~~~~~~~~~~~~~

    Setuptools/distutils commands to assist the building of sphinx
    documentation.

    :author: Sebastian Wiesner
    :contact: basti.wiesner@gmx.net
    :copyright: Copyright 2007-2014 by the Sphinx team, see AUTHORS.
    :license: BSD, see LICENSE for details.
"""

import sys
import os
import types
from io import StringIO
from distutils.cmd import Command
from distutils.errors import DistutilsOptionError

from sphinx.application import Sphinx
from sphinx.util.console import darkred, nocolor, color_terminal
from sphinx.util.osutil import abspath


class BuildDoc(Command):
    """
    Distutils command to build Sphinx documentation.

    The Sphinx build can then be triggered from distutils, and some Sphinx
    options can be set in ``setup.py`` or ``setup.cfg`` instead of Sphinx own
    configuration file.

    For instance, from `setup.py`::

       # this is only necessary when not using setuptools/distribute
       from sphinx.setup_command import BuildDoc
       cmdclass = {'build_sphinx': BuildDoc}

       name = 'My project'
       version = '1.2'
       release = '1.2.0'
       setup(
           name=name,
           author='Bernard Montgomery',
           version=release,
           cmdclass=cmdclass,
           # these are optional and override conf.py settings
           command_options={
               'build_sphinx': {
                   'project': ('setup.py', name),
                   'version': ('setup.py', version),
                   'release': ('setup.py', release)}},
       )

    Or add this section in ``setup.cfg``::

       [build_sphinx]
       project = 'My project'
       version = 1.2
       release = 1.2.0
    """

    description = 'Build Sphinx documentation'
    user_options = [
        ('fresh-env', 'E', 'discard saved environment'),
        ('all-files', 'a', 'build all files'),
        ('source-dir=', 's', 'Source directory'),
        ('build-dir=', None, 'Build directory'),
        ('config-dir=', 'c', 'Location of the configuration directory'),
        ('builder=', 'b', 'The builder to use. Defaults to "html"'),
        ('project=', None, 'The documented project\'s name'),
        ('version=', None, 'The short X.Y version'),
        ('release=', None, 'The full version, including alpha/beta/rc tags'),
        ('today=', None, 'How to format the current date, used as the '
         'replacement for |today|'),
        ('link-index', 'i', 'Link index.html to the master doc'),
    ]
    boolean_options = ['fresh-env', 'all-files', 'link-index']


    def initialize_options(self):
        self.fresh_env = self.all_files = False
        self.source_dir = self.build_dir = None
        self.builder = 'html'
        self.project = ''
        self.version = ''
        self.release = ''
        self.today = ''
        self.config_dir = None
        self.link_index = False

    def _guess_source_dir(self):
        for guess in ('doc', 'docs'):
            if not os.path.isdir(guess):
                continue
            for root, dirnames, filenames in os.walk(guess):
                if 'conf.py' in filenames:
                    return root
        return None

    # Overriding distutils' Command._ensure_stringlike which doesn't support
    # unicode, causing finalize_options to fail if invoked again. Workaround
    # for http://bugs.python.org/issue19570
    def _ensure_stringlike(self, option, what, default=None):
        val = getattr(self, option)
        if val is None:
            setattr(self, option, default)
            return default
        elif not isinstance(val, str):
            raise DistutilsOptionError("'%s' must be a %s (got `%s`)"
                                       % (option, what, val))
        return val

    def finalize_options(self):
        if self.source_dir is None:
            self.source_dir = self._guess_source_dir()
            self.announce('Using source directory %s' % self.source_dir)
        self.ensure_dirname('source_dir')
        if self.source_dir is None:
            self.source_dir = os.curdir
        self.source_dir = abspath(self.source_dir)
        if self.config_dir is None:
            self.config_dir = self.source_dir
        self.config_dir = abspath(self.config_dir)

        if self.build_dir is None:
            build = self.get_finalized_command('build')
            self.build_dir = os.path.join(abspath(build.build_base), 'sphinx')
            self.mkpath(self.build_dir)
        self.build_dir = abspath(self.build_dir)
        self.doctree_dir = os.path.join(self.build_dir, 'doctrees')
        self.mkpath(self.doctree_dir)
        self.builder_target_dir = os.path.join(self.build_dir, self.builder)
        self.mkpath(self.builder_target_dir)

    def run(self):
        if not color_terminal():
            # Windows' poor cmd box doesn't understand ANSI sequences
            nocolor()
        if not self.verbose:
            status_stream = StringIO()
        else:
            status_stream = sys.stdout
        confoverrides = {}
        if self.project:
             confoverrides['project'] = self.project
        if self.version:
             confoverrides['version'] = self.version
        if self.release:
             confoverrides['release'] = self.release
        if self.today:
             confoverrides['today'] = self.today
        app = Sphinx(self.source_dir, self.config_dir,
                     self.builder_target_dir, self.doctree_dir,
                     self.builder, confoverrides, status_stream,
                     freshenv=self.fresh_env)

        try:
            app.build(force_all=self.all_files)
        except Exception as err:
            from docutils.utils import SystemMessage
            if isinstance(err, SystemMessage):
                print(darkred('reST markup error:'), file=sys.stderr)
                print(err.args[0].encode('ascii',
                                                       'backslashreplace'), file=sys.stderr)
            else:
                raise

        if self.link_index:
            src = app.config.master_doc + app.builder.out_suffix
            dst = app.builder.get_outfilename('index')
            os.symlink(src, dst)
