def download_file(url, dest=None, chunk_size=1024, replace="ask",
                  label="Downloading {dest_basename} ({size:.2f}MB)",
                  expected_extension=None):
    """Download a file from a given URL and display progress.

    :param dest: If the destination exists and is a directory, the filename
        will be guessed from the Content-Disposition header. If the destination
        is an existing file, the user will either be prompted to overwrite, or
        the file will be replaced (depending on the value of **replace**). If
        the destination does not exist, it will be used as the filename.
    :param int chunk_size: bytes read in at a time.
    :param replace: If `False`, an existing destination file will not be
        overwritten.
    :param label: a string which is formatted and displayed as the progress bar
        label. Variables provided include *dest_basename*, *dest*, and *size*.
    :param expected_extension: if set, the filename will be sanitized to ensure
        it has the given extension. The extension should not start with a dot
        (`.`).
    """
    dest = Path(dest or url.split("/")[-1])
    response = get(url, stream=True)
    if (dest.exists()
            and dest.is_dir()
            and "Content-Disposition" in response.headers):
        content_disposition = rfc6266.parse_requests_response(response)
        if expected_extension is not None:
            filename = content_disposition.filename_sanitized(
                expected_extension)
        filename = secure_filename(filename)
        dest = dest / filename
    if dest.exists() and not dest.is_dir():
        if (replace is False
                or replace == "ask"
                and not click.confirm("Replace {}?".format(dest))):
            return str(dest)
    size = int(response.headers.get("content-length", 0))
    label = label.format(dest=dest, dest_basename=dest.name,
                         size=size/1024.0/1024)
    with click.open_file(str(dest), "wb") as f:
        content_iter = response.iter_content(chunk_size=chunk_size)
        with click.progressbar(content_iter, length=size/1024,
                               label=label) as bar:
            for chunk in bar:
                if chunk:
                    f.write(chunk)
                    f.flush()
    return str(dest)
def draw(self, context):
        layout = self.layout

        userpref = context.user_preferences
        paths = userpref.filepaths
        system = userpref.system

        split = layout.split(percentage=0.7)

        col = split.column()
        col.label(text="File Paths:")

        colsplit = col.split(percentage=0.95)
        col1 = colsplit.split(percentage=0.3)

        sub = col1.column()
        sub.label(text="Fonts:")
        sub.label(text="Textures:")
        sub.label(text="Render Output:")
        sub.label(text="Scripts:")
        sub.label(text="Sounds:")
        sub.label(text="Temp:")
        sub.label(text="Render Cache:")
        sub.label(text="I18n Branches:")
        sub.label(text="Image Editor:")
        sub.label(text="Animation Player:")

        sub = col1.column()
        sub.prop(paths, "font_directory", text="")
        sub.prop(paths, "texture_directory", text="")
        sub.prop(paths, "render_output_directory", text="")
        sub.prop(paths, "script_directory", text="")
        sub.prop(paths, "sound_directory", text="")
        sub.prop(paths, "temporary_directory", text="")
        sub.prop(paths, "render_cache_directory", text="")
        sub.prop(paths, "i18n_branches_directory", text="")
        sub.prop(paths, "image_editor", text="")
        subsplit = sub.split(percentage=0.3)
        subsplit.prop(paths, "animation_player_preset", text="")
        subsplit.prop(paths, "animation_player", text="")

        col.separator()
        col.separator()

        colsplit = col.split(percentage=0.95)
        sub = colsplit.column()

        row = sub.split(percentage=0.3)
        row.label(text="Auto Execution:")
        row.prop(system, "use_scripts_auto_execute")

        if system.use_scripts_auto_execute:
            box = sub.box()
            row = box.row()
            row.label(text="Excluded Paths:")
            row.operator("wm.userpref_autoexec_path_add", text="", icon='ZOOMIN', emboss=False)
            for i, path_cmp in enumerate(userpref.autoexec_paths):
                row = box.row()
                row.prop(path_cmp, "path", text="")
                row.prop(path_cmp, "use_glob", text="", icon='FILTER')
                row.operator("wm.userpref_autoexec_path_remove", text="", icon='X', emboss=False).index = i

        col = split.column()
        col.label(text="Save & Load:")
        col.prop(paths, "use_relative_paths")
        col.prop(paths, "use_file_compression")
        col.prop(paths, "use_load_ui")
        col.prop(paths, "use_filter_files")
        col.prop(paths, "show_hidden_files_datablocks")
        col.prop(paths, "hide_recent_locations")
        col.prop(paths, "hide_system_bookmarks")
        col.prop(paths, "show_thumbnails")

        col.separator()

        col.prop(paths, "save_version")
        col.prop(paths, "recent_files")
        col.prop(paths, "use_save_preview_images")

        col.separator()

        col.label(text="Auto Save:")
        col.prop(paths, "use_keep_session")
        col.prop(paths, "use_auto_save_temporary_files")
        sub = col.column()
        sub.active = paths.use_auto_save_temporary_files
        sub.prop(paths, "auto_save_time", text="Timer (mins)")

        col.separator()

        col.label(text="Text Editor:")
        col.prop(system, "use_tabs_as_spaces")

        colsplit = col.split(percentage=0.95)
        col1 = colsplit.split(percentage=0.3)

        sub = col1.column()
        sub.label(text="Author:")
        sub = col1.column()
        sub.prop(system, "author", text="")