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- # Copyright (C) 2015 YouCompleteMe contributors.
- #
- # 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/>.
- from __future__ import unicode_literals
- from __future__ import print_function
- from __future__ import division
- from __future__ import absolute_import
- from future import standard_library
- standard_library.install_aliases()
- from builtins import * # noqa
- import os
- import sys
- import vim
- import functools
- import re
- # Can't import these from setup.py because it makes nosetests go crazy.
- DIR_OF_CURRENT_SCRIPT = os.path.dirname( os.path.abspath( __file__ ) )
- DIR_OF_YCMD = os.path.join( DIR_OF_CURRENT_SCRIPT, '..', '..', 'third_party',
- 'ycmd' )
- WIN_PYTHON_PATH = os.path.join( sys.exec_prefix, 'python.exe' )
- PYTHON_BINARY_REGEX = re.compile(
- r'python((2(\.[67])?)|(3(\.[3-9])?))?(.exe)?$' )
- def Memoize( obj ):
- cache = obj.cache = {}
- @functools.wraps( obj )
- def memoizer( *args, **kwargs ):
- key = str( args ) + str( kwargs )
- if key not in cache:
- cache[ key ] = obj( *args, **kwargs )
- return cache[ key ]
- return memoizer
- @Memoize
- def PathToPythonInterpreter():
- from ycmd import utils
- python_interpreter = vim.eval( 'g:ycm_server_python_interpreter' )
- if python_interpreter:
- if IsPythonVersionCorrect( python_interpreter ):
- return python_interpreter
- raise RuntimeError( "Path in 'g:ycm_server_python_interpreter' option "
- "does not point to a valid Python 2.6+ or 3.3+." )
- python_interpreter = _PathToPythonUsedDuringBuild()
- if IsPythonVersionCorrect( python_interpreter ):
- return python_interpreter
- # On UNIX platforms, we use sys.executable as the Python interpreter path.
- # We cannot use sys.executable on Windows because for unknown reasons, it
- # returns the Vim executable. Instead, we use sys.exec_prefix to deduce the
- # interpreter path.
- python_interpreter = ( WIN_PYTHON_PATH if utils.OnWindows() else
- sys.executable )
- if IsPythonVersionCorrect( python_interpreter ):
- return python_interpreter
- # As a last resort, we search python in the PATH. We prefer Python 2 over 3
- # for the sake of backwards compatibility with ycm_extra_conf.py files out
- # there; few people wrote theirs to work on py3.
- # So we check 'python2' before 'python' because on some distributions (Arch
- # Linux for example), python refers to python3.
- python_interpreter = utils.PathToFirstExistingExecutable( [ 'python2',
- 'python',
- 'python3' ] )
- if IsPythonVersionCorrect( python_interpreter ):
- return python_interpreter
- raise RuntimeError( "Cannot find Python 2.6+ or 3.3+. You can set its path "
- "using the 'g:ycm_server_python_interpreter' "
- "option." )
- def _PathToPythonUsedDuringBuild():
- from ycmd import utils
- try:
- filepath = os.path.join( DIR_OF_YCMD, 'PYTHON_USED_DURING_BUILDING' )
- return utils.ReadFile( filepath ).strip()
- # We need to check for IOError for Python2 and OSError for Python3
- except ( IOError, OSError ):
- return None
- def EndsWithPython( path ):
- """Check if given path ends with a python 2.6+ or 3.3+ name."""
- return path and PYTHON_BINARY_REGEX.search( path ) is not None
- def IsPythonVersionCorrect( path ):
- """Check if given path is the Python interpreter version 2.6+ or 3.3+."""
- from ycmd import utils
- if not EndsWithPython( path ):
- return False
- command = [ path,
- '-c',
- "import sys;"
- "major, minor = sys.version_info[ :2 ];"
- "good_python = ( major == 2 and minor >= 6 ) "
- "or ( major == 3 and minor >= 3 ) or major > 3;"
- # If this looks weird, remember that:
- # int( True ) == 1
- # int( False ) == 0
- "sys.exit( not good_python )" ]
- return utils.SafePopen( command ).wait() == 0
- def PathToServerScript():
- return os.path.join( DIR_OF_YCMD, 'ycmd' )
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