How to use the sigal.utils.read_markdown function in sigal

def test_read_markdown():
    src = os.path.join(SAMPLE_DIR, 'pictures', 'dir1', 'test1', '11.md')
    m = utils.read_markdown(src)
    assert m['title'] == "Foo Bar"
    assert m['meta']['location'][0] == "Bavaria"
    assert m['description'] == \
        "<p>This is a funny description of this image</p>"

def test_read_markdown_empty_file(tmpdir):
    src = tmpdir.join("file.txt")
    src.write("content")
    m = utils.read_markdown(str(src))
    assert 'title' not in m
    assert m['meta'] == {}
    assert m['description'] == '<p>content</p>'

    src = tmpdir.join("empty.txt")
    src.write("")
    m = utils.read_markdown(str(src))
    assert 'title' not in m
    # See https://github.com/Python-Markdown/markdown/pull/672
    # Meta attributes should always be there
    assert m['meta'] == {}
    assert m['description'] == ''

def _get_metadata(self):
        """Get album metadata from `description_file` (`index.md`):

        -> title, thumbnail image, description

        """
        descfile = join(self.src_path, self.description_file)
        self.description = ''
        self.meta = {}
        # default: get title from directory name
        self.title = os.path.basename(self.path if self.path != '.'
                                      else self.src_path)

        if isfile(descfile):
            meta = read_markdown(descfile)
            for key, val in meta.items():
                setattr(self, key, val)

        try:
            self.author = self.meta['author'][0]
        except KeyError:
            self.author = self.settings.get('author')

def _get_metadata(self):
        """ Get image metadata from filename.md: title, description, meta."""
        self.description = ''
        self.meta = {}
        self.title = ''

        descfile = splitext(self.src_path)[0] + '.md'
        if isfile(descfile):
            meta = read_markdown(descfile)
            for key, val in meta.items():
                setattr(self, key, val)