Format a `JsonWeb` `ValidationError` stack

gistfile1.py

def format_validation_error(error, parent=None, indent=""):

    def recurse(e, parent):
        return format_validation_error(e, parent=p(parent),
                                       indent=indent + " ")

    def p(child):
        if parent is None:
            return child
        return (child.startswith("[") and "" or ".").join([parent, child])

    output = ["{0}{1} {2}".format(
        indent,
        parent and fail(parent + ":") or "",
        str(error)
    )]

    if error.errors is None:
        return output[0]

    if isinstance(error.errors, dict):
        for k, e in error.errors.iteritems():
            output.append(recurse(e, k))
    elif isinstance(error.errors, list):
        for e in error.errors:
            output.append(recurse(e, "[{0}]".format(e.extras["index"])))

    return "\n".join(output)
    
    
def fail(text):
    return "\033[91m{0}\033[0m".format(text)