#!/usr/bin/env python
#
# Copyright (C) 2011, 2012  Strahinja Val Markovic  <val@markovic.io>
#
# This file is part of YouCompleteMe.
#
# YouCompleteMe 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.
#
# YouCompleteMe 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 YouCompleteMe.  If not, see <http://www.gnu.org/licenses/>.

import vim

def CurrentLineAndColumn():
  """Returns the 0-based current line and 0-based current column."""
  # See the comment in CurrentColumn about the calculation for the line and
  # column number
  line, column = vim.current.window.cursor
  line -= 1
  return line, column


def CurrentColumn():
  """Returns the 0-based current column. Do NOT access the CurrentColumn in
  vim.current.line. It doesn't exist yet.  Only the chars before the current
  column exist in vim.current.line."""

  # vim's columns are 1-based while vim.current.line columns are 0-based
  # ... but vim.current.window.cursor (which returns a (line, column) tuple)
  # columns are 0-based, while the line from that same tuple is 1-based.
  # vim.buffers buffer objects OTOH have 0-based lines and columns.
  # Pigs have wings and I'm a loopy purple duck. Everything makes sense now.
  return vim.current.window.cursor[ 1 ]


def GetUnsavedBuffers():
  def BufferModified( buffer_number ):
    to_eval = 'getbufvar({0}, "&mod")'.format( buffer_number )
    return bool( int( vim.eval( to_eval ) ) )

  return ( x for x in vim.buffers if BufferModified( x.number ) )


def NumLinesInBuffer( buffer ):
  # This is actually less than obvious, that's why it's wrapped in a function
  return len( buffer )


def PostVimMessage( message ):
  # TODO: escape the message string before formating it
  vim.command( 'echohl WarningMsg | echomsg "{0}" | echohl None'
               .format( message ) )


def EchoText( text ):
  vim.command( "echom '{0}'".format( text.replace( "'", r"''") ) )


def EscapeForVim( text ):
  return text.replace( "'", "''" )


def CurrentFiletype():
  return vim.eval( "&filetype" )


def GetVariableValue( variable ):
  return vim.eval( variable )