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Auto merge of #2598 - micbou:python-interpreter-no-cache, r=puremourning

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[READY] Do not cache Python interpreter path

Once YCM is installed through a plugin manager in Vim (e.g. using the `:PluginInstall` command with Vundle), it picks a Python interpreter (most likely the one used to run YCM inside Vim), caches it, and starts the server with it. This fails since the `ycm_core` library is not yet compiled and the following message is displayed on the status line:
```
The ycmd server SHUT DOWN (restart with ':YcmRestartServer'). YCM core library not detected; you need to compile YCM before using it. Follow the instructions in the documentation.
```
After reading the documentation, the user may then build the library directly from Vim:
```
:!/path/to/YCM/install.py
```
or by opening a new terminal and calling the `install.py` script without leaving Vim. Once the compilation is done, he will restart the server with the `:YcmRestartServer` command. However, since the Python interpreter used to start the server is already cached, YCM will not pick the one from the `PYTHON_USED_DURING_BUILDING` file generated by the `install.py` script. If these Pythons are different (e.g. Python 2 versus Python 3), YCM will fail to start the server again. This doesn't happen if we don't cache the Python interpreter path.

I suspect this is the issue experienced in #2431 and often reported by users on Ubuntu 16.04 where Vim is compiled with Python 3 support but default Python is Python 2. See https://github.com/Valloric/YouCompleteMe/pull/2140#issuecomment-273495342 and https://github.com/Valloric/YouCompleteMe/issues/35#issuecomment-290877053.

Fixes #2431.

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This commit is contained in:
Homu 2017-04-03 06:22:46 +09:00
commit cbb3406363
1 changed files with 3 additions and 14 deletions
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17
python/ycm/paths.py
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@ -25,7 +25,6 @@ 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.
@ -37,19 +36,9 @@ PYTHON_BINARY_REGEX = re.compile(
r'python((2(\.[67])?)|(3(\.[3-9])?))?(.exe)?$', re.IGNORECASE )
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
# Not caching the result of this function; users shouldn't have to restart Vim
# after running the install script or setting the
# `g:ycm_server_python_interpreter` option.
def PathToPythonInterpreter():
# Not calling the Python interpreter to check its version as it significantly
# impacts startup time.