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Auto merge of #3303 - micbou:python-check, r=micbou

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[READY] Improve error message when unable to load Python

The current error when Python cannot be loaded
> YouCompleteMe unavailable: requires Vim compiled Python (2.7.1+ or 3.4+) support.

is misleading if Vim has been dynamically compiled against Python but is unable to find the library. See issue https://github.com/Valloric/YouCompleteMe/issues/3300 for instance. We should only return that error if `has( 'python_compiled' )` and `has( 'python3_compiled' )` are both false. Furthermore, we should check if Python 3 is available before Python 2 because on some platforms, only one Python library can be loaded at a time so if Python 2 is loaded first, Python 3 cannot be used.

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zzbot 2019-01-22 11:58:10 -08:00 committed by GitHub
commit b26ba2681e
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@ -54,13 +54,22 @@ elseif !has( 'timers' )
\ echohl None
call s:restore_cpo()
finish
elseif !has( 'python' ) && !has( 'python3' )
elseif !has( 'python_compiled' ) && !has( 'python3_compiled' )
echohl WarningMsg |
\ echomsg "YouCompleteMe unavailable: requires Vim compiled with " .
\ "Python (2.7.1+ or 3.4+) support." |
\ echohl None
call s:restore_cpo()
finish
" These calls try to load the Python 2 and Python 3 libraries when Vim is
" compiled dynamically against them. Since only one can be loaded at a time on
" some platforms, we first check if Python 3 is available.
elseif !has( 'python3' ) && !has( 'python' )
echohl WarningMsg |
\ echomsg "YouCompleteMe unavailable: unable to load Python." |
\ echohl None
call s:restore_cpo()
finish
elseif &encoding !~? 'utf-\?8'
echohl WarningMsg |
\ echomsg "YouCompleteMe unavailable: requires UTF-8 encoding. " .