gistfile1.py

def auto_version(endpoint, **values):
    """
    Auto versions static assets.
    """
    from flask import current_app as app
    from flask import url_for
    if app.debug:
        return url_for(endpoint, **values)
    # Check if accessing static file.
    static_root = None
    if endpoint == 'static':
        static_root = app.static_folder
    if not static_root:
        m = re.match(r'(.+)\.static', endpoint)
        if m:
            try:
                static_root = app.blueprints[m.group(1)].static_folder
            except:
                pass
    # Get the timestamp of the file.
    if static_root:
        filename = values.get('filename', None)
        if filename:
            file_path = os.path.join(static_root, filename)
            if os.path.splitext(file_path) in ['.css', '.coffee']:
                file_path = re.sub('(css|coffee)', {'css': 'less', 'coffee': 'js'}["\\1"], file_path)
            if os.path.isfile(file_path):
                values['q'] = int(os.stat(file_path).st_mtime)
    return url_for(endpoint, **values)