# Copyright (c) 2009, 2010, 2011 Google Inc. All rights reserved.
# Copyright (c) 2009 Apple Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
#     * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import re


def _first_non_empty_line_after_index(lines, index=0):
    first_non_empty_line = index
    for line in lines[index:]:
        if re.match(r"^\s*$", line):
            first_non_empty_line += 1
        else:
            break
    return first_non_empty_line


class CommitMessage:
    def __init__(self, message):
        self.message_lines = message[_first_non_empty_line_after_index(message, 0):]

    def body(self, lstrip=False):
        lines = self.message_lines[_first_non_empty_line_after_index(self.message_lines, 1):]
        if lstrip:
            lines = [line.lstrip() for line in lines]
        return "\n".join(lines) + "\n"

    def description(self, lstrip=False, strip_url=False):
        line = self.message_lines[0]
        if lstrip:
            line = line.lstrip()
        if strip_url:
            line = re.sub(r"^(\s*)<.+> ", "\1", line)
        return line

    def message(self):
        return "\n".join(self.message_lines) + "\n"
