#!/usr/bin/env python
# -*- encoding: utf-8
##    pp-indent - Filter to apply indentation to preprocessor statements
##
##    Copyright ©2013 Ben Longbons <b.r.longbons@gmail.com>
##
##    This file is part of The Mana World (Athena server)
##
##    This program 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.
##
##    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

# Settings.

pre_indent = ''
post_indent = ' '
rules = {
    'if': (0, 1),
    'ifdef': (0, 1),
    'ifndef': (0, 1),
    'else': (-1, 1),
    'elif': (-1, 1),
    'endif': (-1, 0),
    'define_h': (-1, 1),
}

import sys

depth = 0
for line in sys.stdin:
    sline = line.lstrip()
    if not sline.startswith('#'):
        sys.stdout.write(line)
        continue
    line = sline[1:].lstrip()
    if not line:
        sys.stdout.write('\n')
        continue
    word = line.split(None, 1)[0]
    if word == 'define' and line.endswith('_HPP\n'):
        word = 'define_h'
    pre, post = rules.get(word, (0, 0))
    depth += pre
    sys.stdout.writelines([depth * pre_indent, '#', depth * post_indent, line])
    depth += post