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

def test_url_from_path():
    assert utils.url_from_path(os.sep.join(['foo', 'bar'])) == 'foo/bar'

def test_url_from_windows_path(monkeypatch):
    monkeypatch.setattr('os.sep', "\\")
    path = os.sep.join(['foo', 'bar'])
    assert path == r'foo\bar'
    assert utils.url_from_path(path) == 'foo/bar'

def random_thumbnail(self):
        try:
            return url_from_path(join(self.name,
                                      random.choice(self.medias).thumbnail))
        except IndexError:
            return self.thumbnail

def big_url(self):
        """URL of the original media."""
        if self.big is not None:
            return url_from_path(self.big)

def url(self):
        """URL of the media."""
        return url_from_path(self.filename)

def generate_context(self, album):
        """Generate the context dict for the given path."""

        from . import __url__ as sigal_link
        self.logger.info("Output album : %r", album)
        return {
            'album': album,
            'index_title': self.index_title,
            'settings': self.settings,
            'sigal_link': sigal_link,
            'theme': {'name': os.path.basename(self.theme),
                      'url': url_from_path(os.path.relpath(self.theme_path,
                                                           album.dst_path))},
        }

def breadcrumb(self):
        """List of ``(url, title)`` tuples defining the current breadcrumb
        path.
        """
        if self.path == '.':
            return []

        path = self.path
        breadcrumb = [((self.url_ext or '.'), self.title)]

        while True:
            path = os.path.normpath(os.path.join(path, '..'))
            if path == '.':
                break

            url = (url_from_path(os.path.relpath(path, self.path)) + '/' +
                   self.url_ext)
            breadcrumb.append((url, self.gallery.albums[path].title))

        breadcrumb.reverse()
        return breadcrumb

self._thumbnail = None

        if path == '.':
            self.src_path = settings['source']
            self.dst_path = settings['destination']
        else:
            self.src_path = join(settings['source'], path)
            self.dst_path = join(settings['destination'], path)

        self.logger = logging.getLogger(__name__)
        self._get_metadata()

        # optionally add index.html to the URLs
        self.url_ext = self.output_file if settings['index_in_url'] else ''

        self.index_url = url_from_path(os.path.relpath(
            settings['destination'], self.dst_path)) + '/' + self.url_ext

        #: List of all medias in the album (:class:`~sigal.gallery.Image` and
        #: :class:`~sigal.gallery.Video`).
        self.medias = medias = []
        self.medias_count = defaultdict(int)

        for f in filenames:
            ext = splitext(f)[1]
            if ext.lower() in settings['img_extensions']:
                media = Image(f, self.path, settings)
            elif ext.lower() in settings['video_extensions']:
                media = Video(f, self.path, settings)
            else:
                continue

try:
                # if thumbnail is missing (if settings['make_thumbs'] is False)
                s = self.settings
                if self.type == 'image':
                    image.generate_thumbnail(
                        path, self.thumb_path, s['thumb_size'],
                        fit=s['thumb_fit'])
                elif self.type == 'video':
                    video.generate_thumbnail(
                        path, self.thumb_path, s['thumb_size'],
                        s['thumb_video_delay'], fit=s['thumb_fit'],
                        converter=s['video_converter'])
            except Exception as e:
                self.logger.error('Failed to generate thumbnail: %s', e)
                return
        return url_from_path(self.thumb_name)

def thumbnail(self):
        """Path to the thumbnail of the album."""

        if self._thumbnail:
            # stop if it is already set
            return self._thumbnail

        # Test the thumbnail from the Markdown file.
        thumbnail = self.meta.get('thumbnail', [''])[0]

        if thumbnail and isfile(join(self.src_path, thumbnail)):
            self._thumbnail = url_from_path(join(
                self.name, get_thumb(self.settings, thumbnail)))
            self.logger.debug("Thumbnail for %r : %s", self, self._thumbnail)
            return self._thumbnail
        else:
            # find and return the first landscape image
            for f in self.medias:
                ext = splitext(f.filename)[1]
                if ext.lower() in self.settings['img_extensions']:
                    # Use f.size if available as it is quicker (in cache), but
                    # fallback to the size of src_path if dst_path is missing
                    size = f.size
                    if size is None:
                        size = get_size(f.src_path)

                    if size['width'] > size['height']:
                        self._thumbnail = (url_quote(self.name) + '/' +