#!/usr/bin/env python3

#

# docchecker - look for problematic markup

#

# Copyright 2016 timeless <timeless@mozdev.org> and others

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

from __future__ import absolute_import, print_function

import os

import re

import sys

try:

    import msvcrt

    msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)

    msvcrt.setmode(sys.stderr.fileno(), os.O_BINARY)

except ImportError:

    pass

stdout = getattr(sys.stdout, 'buffer', sys.stdout)

leadingline = re.compile(br'(^\s*)(\S.*)$')

checks = [

    (

        br""":hg:`[^`]*'[^`]*`""",

        b"""warning: please avoid nesting ' in :hg:`...`""",

    ),

    (br'\w:hg:`', b'warning: please have a space before :hg:'),

    (

        br"""(?:[^a-z][^'.])hg ([^,;"`]*'(?!hg)){2}""",

        b'''warning: please use " instead of ' for hg ... "..."''',

    ),

]

def check(line):

    messages = []

    for match, msg in checks:

        if re.search(match, line):

            messages.append(msg)

    if messages:

        stdout.write(b'%s\n' % line)

        for msg in messages:

            stdout.write(b'%s\n' % msg)

def work(file):

    (llead, lline) = (b'', b'')

    for line in file:

        # this section unwraps lines

        match = leadingline.match(line)

        if not match:

            check(lline)

            (llead, lline) = (b'', b'')

            continue

        lead, line = match.group(1), match.group(2)

        if lead == llead:

            if lline != b'':

                lline += b' ' + line

            else:

                lline = line

        else:

            check(lline)

            (llead, lline) = (lead, line)

    check(lline)

def main():

    for f in sys.argv[1:]:

        try:

            with open(f, 'rb') as file:

                work(file)

        except BaseException as e:

            sys.stdout.write(r"failed to process %s: %s\n" % (f, e))

main()