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# coding: utf-8

"""
Helper for formatting exception messages. Exports the following items:

 - pretty_message()
"""

from __future__ import unicode_literals, division, absolute_import, print_function

import re
import textwrap


__all__ = [
    'pretty_message',
]


def pretty_message(string, *params):
    """
    Takes a multi-line string and does the following:

     - dedents
     - converts newlines with text before and after into a single line
     - strips leading and trailing whitespace

    :param string:
        The string to format

    :param *params:
        Params to interpolate into the string

    :return:
        The formatted string
    """

    output = textwrap.dedent(string)

    # Unwrap lines, taking into account bulleted lists, ordered lists and
    # underlines consisting of = signs
    if output.find('\n') != -1:
        output = re.sub('(?<=\\S)\n(?=[^ \n\t\\d\\*\\-=])', ' ', output)

    if params:
        output = output % params

    output = output.strip()

    return output