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import argparse as _argparse
import textwrap as _textwrap
# argparse's formatters remove newlines from comand descriptions, so we define a new one
class HelpFormatterRespectNewlines(_argparse.HelpFormatter):
"""Help message formatter which retains line breaks in argument descriptions.
Only the name of this class is considered a public API. All the methods
provided by the class are considered an implementation detail.
"""
def _split_lines(self, text, width):
lines = []
for line in text.splitlines():
line = self._whitespace_matcher.sub(' ', line).strip()
lines.extend( _textwrap.wrap(line, width) )
return lines
# argparse's formatters are not really able to discover the terminale size, so we override them
def FixedWidthFormatter(formatter, width):
"""Adaptor for argparse formatters using an explicit fixed width
"""
def f(*args, **keywords):
# add or replace the "width" parameter
keywords['width'] = width
return formatter(*args, **keywords)
return f
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