# -*- coding: utf-8 -*-
#
# Copyright © 2017 markdown-textwrap contributors.
#
# This file is part of markdown-textwrap.
#
# markdown-textwrap is free software: you can redistribute it
# and/or modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation, either version 3 of
# the License, or (at your option) any later version.
#
# markdown-textwrap is distributed in the hope that it will be
# useful, but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with markdown-textwrap (see COPYING). If not, see
# <http://www.gnu.org/licenses/>.
import re
import textwrap
import mistune
class TWBlockLexer(mistune.BlockLexer):
"""Text Wrap Block lexer for block grammar."""
def __init__(self, rules=None, **kwargs):
super(TWBlockLexer, self).__init__(rules, **kwargs)
# from mistune
self._key_pattern = re.compile(r'\s+')
# from mistune
def _keyify(self, key):
key = mistune.escape(key.lower(), quote=True)
return self._key_pattern.sub(' ', key)
def parse_block_code(self, m):
self.tokens.append({
'type': 'code',
'lang': None,
'text': m.group(0),
})
def parse_fences(self, m):
self.tokens.append({
'type': 'code',
'lang': None,
'text': m.group(0),
})
def parse_heading(self, m):
self.tokens.append({
'type': 'heading',
'level': len(m.group(1)),
'text': m.group(0),
})
def parse_lheading(self, m):
"""Parse setext heading."""
self.tokens.append({
'type': 'heading',
'level': 1 if m.group(2) == '=' else 2,
'text': m.group(0),
})
def parse_hrule(self, m):
self.tokens.append({
'type': 'hrule',
'text': m.group(0)
})
class TWInlineLexer(mistune.InlineLexer):
"""Text Wrap Inline level lexer for inline gramars."""
def __init__(self, renderer, rules=None, **kwargs):
super(TWInlineLexer, self).__init__(renderer, rules, **kwargs)
# No inline rules.
self.default_rules = []
def output(self, text, rules=None):
# Don't parse inline text.
return text
class TWRenderer(mistune.Renderer):
"""Text Wrap Renderer."""
def __init__(self, **kwargs):
super(TWRenderer, self).__init__(**kwargs)
# Initalize textwrap.TextWrapper class
self.tw = textwrap.TextWrapper(
width=kwargs.get('tw_width', 72)
)
def _tw_set_options(self, **kwargs):
"""
Set options for the local textwrap.TextWrapper instance.
"""
# Recognized options.
opts = [
'width',
'initial_indent',
'subsequent_indent',
'drop_whitespace'
]
for opt, val in kwargs.items():
if not opt in opts:
continue
# Set option
setattr(self.tw, opt, val)
def _tw_fill(self, text, **kwargs):
"""Wrap text.
"""
self._tw_set_options(**kwargs)
return self.tw.fill(text)
def paragraph(self, text):
return '\n{}\n'.format(self._tw_fill(text))
class TWMarkdown(mistune.Markdown):
"""Text Wrap Markdown parser.
"""
def __init__(self, **kwargs):
renderer = TWRenderer(**kwargs)
super(TWMarkdown, self).__init__(
renderer,
TWInlineLexer,
TWBlockLexer
)
def parse(self, text):
out = super(TWMarkdown, self).parse(text)
# Strip newline at the beginning.
return out.lstrip('\n')
def main():
print('USAGE: md_tw 72 file.md file2.md [...]')
