113 lines
4.0 KiB
Python
113 lines
4.0 KiB
Python
# Copyright (C) 2015-2017 YouCompleteMe contributors.
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#
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# This file is part of YouCompleteMe.
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#
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# YouCompleteMe is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# YouCompleteMe is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with YouCompleteMe. If not, see <http://www.gnu.org/licenses/>.
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from __future__ import unicode_literals
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from __future__ import print_function
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from __future__ import division
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from __future__ import absolute_import
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# Not installing aliases from python-future; it's unreliable and slow.
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from builtins import * # noqa
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import os
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import sys
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import vim
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import functools
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import re
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# Can't import these from setup.py because it makes nosetests go crazy.
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DIR_OF_CURRENT_SCRIPT = os.path.dirname( os.path.abspath( __file__ ) )
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DIR_OF_YCMD = os.path.join( DIR_OF_CURRENT_SCRIPT, '..', '..', 'third_party',
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'ycmd' )
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WIN_PYTHON_PATH = os.path.join( sys.exec_prefix, 'python.exe' )
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PYTHON_BINARY_REGEX = re.compile(
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r'python((2(\.[67])?)|(3(\.[3-9])?))?(.exe)?$' )
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def Memoize( obj ):
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cache = obj.cache = {}
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@functools.wraps( obj )
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def memoizer( *args, **kwargs ):
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key = str( args ) + str( kwargs )
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if key not in cache:
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cache[ key ] = obj( *args, **kwargs )
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return cache[ key ]
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return memoizer
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@Memoize
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def PathToPythonInterpreter():
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# Not calling the Python interpreter to check its version as it significantly
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# impacts startup time.
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from ycmd import utils
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python_interpreter = vim.eval( 'g:ycm_server_python_interpreter' )
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if python_interpreter:
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if _EndsWithPython( python_interpreter ):
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return python_interpreter
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raise RuntimeError( "Path in 'g:ycm_server_python_interpreter' option "
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"does not point to a valid Python 2.6+ or 3.3+." )
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python_interpreter = _PathToPythonUsedDuringBuild()
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if _EndsWithPython( python_interpreter ):
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return python_interpreter
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# On UNIX platforms, we use sys.executable as the Python interpreter path.
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# We cannot use sys.executable on Windows because for unknown reasons, it
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# returns the Vim executable. Instead, we use sys.exec_prefix to deduce the
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# interpreter path.
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python_interpreter = ( WIN_PYTHON_PATH if utils.OnWindows() else
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sys.executable )
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if _EndsWithPython( python_interpreter ):
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return python_interpreter
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# As a last resort, we search python in the PATH. We prefer Python 2 over 3
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# for the sake of backwards compatibility with ycm_extra_conf.py files out
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# there; few people wrote theirs to work on py3.
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# So we check 'python2' before 'python' because on some distributions (Arch
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# Linux for example), python refers to python3.
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python_interpreter = utils.PathToFirstExistingExecutable( [ 'python2',
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'python',
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'python3' ] )
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if python_interpreter:
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return python_interpreter
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raise RuntimeError( "Cannot find Python 2.6+ or 3.3+. You can set its path "
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"using the 'g:ycm_server_python_interpreter' "
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"option." )
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def _PathToPythonUsedDuringBuild():
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from ycmd import utils
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try:
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filepath = os.path.join( DIR_OF_YCMD, 'PYTHON_USED_DURING_BUILDING' )
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return utils.ReadFile( filepath ).strip()
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# We need to check for IOError for Python2 and OSError for Python3
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except ( IOError, OSError ):
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return None
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def _EndsWithPython( path ):
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"""Check if given path ends with a python 2.6+ or 3.3+ name."""
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return path and PYTHON_BINARY_REGEX.search( path ) is not None
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def PathToServerScript():
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return os.path.join( DIR_OF_YCMD, 'ycmd' )
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