This converts <http://criticmarkup.com/> tags in a Markdown file to "equivalent" LaTex formatting.

critic_to_tex.py

#!/usr/bin/python

# This converts <http://criticmarkup.com/> tags in a Markdown file to
# "equivalent" LaTex formatting.
#
# By Wladston Filho <wlad@code.enegy>

import sys
import re

comm_pattern = re.compile('(?s)\{\>\>(?P<value>.*?)\<\<\}', re.DOTALL)
mark_pattern = re.compile('(?s)\{\=\=(?P<value>.*?)\=\=\}', re.DOTALL)
add_pattern = re.compile('(?s)\{\+\+(?P<value>.*?)\+\+[ \t]*'
                         '(\[(?P<meta>.*?)\])?[ \t]*\}', re.DOTALL)
del_pattern = re.compile('(?s)\{\-\-(?P<value>.*?)\-\-[ \t]*'
                         '(\[(?P<meta>.*?)\])?[ \t]*\}', re.DOTALL)
subs_pattern = re.compile('(?s)\{\~\~(?P<original>(?:[^\~\>]|(?:\~(?!\>)))+)'
                          '\~\>(?P<new>(?:[^\~\~]|(?:\~(?!\~\})))+)'
                          '\~\~\}', re.DOTALL)

hl_st = '\sethlcolor{yellow}\hl{'
del_st = ' \sethlcolor{red}\hl{'
ins_st = '\sethlcolor{green}\hl{'
comm_st = '\\pdfcomment[icon=Note,color=yellow]{'


def deletionProcess(group_object):
    replaceString = del_st + group_object.group('value') + '}'
    return replaceString


def subsProcess(group_object):
    deleted = del_st + group_object.group('original') + '}'
    inserted = ins_st + group_object.group('new') + '}'
    return deleted + inserted


def additionProcess(group_object):
    replaceString = ins_st + group_object.group('value') + '}'
    return replaceString


def highlightProcess(group_object):
    return hl_st + group_object.group('value') + '}'


def commProcess(group_object):
    return comm_st + group_object.group('value') + '}'


if not sys.stdin.isatty():
    h = sys.stdin.read()
else:
    h = '''{>>comment<<}, {==mark==}, {++add++}, {--del--}, {~~sub~>subs~~}.'''

h = re.sub(del_pattern, deletionProcess, h)
h = re.sub(add_pattern, additionProcess, h)
h = re.sub(comm_pattern, commProcess, h)
h = re.sub(mark_pattern, highlightProcess, h)
h = re.sub(subs_pattern, subsProcess, h)

sys.stdout.write(h)