Ultisnips: Ultisnips causes python error with latest Neovim version

[perks]

• Neovim version:

NVIM 0.1.3-dev
Build type: RelWithDebInfo
Compilation: /usr/bin/x86_64-linux-gnu-gcc -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wconversion -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -O2 -g -DDISABLE_LOG -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wvla -fstack-protector --param ssp-buffer-size=4 -DINCLUDE_GENERATED_DECLARATIONS -DHAVE_CONFIG_H -D_GNU_SOURCE -I/build/neovim-EtgA2h/neovim-0.1.2ubuntu1+git201603241504+2376+17~ubuntu14.04.1/build/config -I/build/neovim-EtgA2h/neovim-0.1.2ubuntu1+git201603241504+2376+17~ubuntu14.04.1/src -I/build/neovim-EtgA2h/neovim-0.1.2ubuntu1+git201603241504+2376+17~ubuntu14.04.1/.deps/usr/include -I/build/neovim-EtgA2h/neovim-0.1.2ubuntu1+git201603241504+2376+17~ubuntu14.04.1/.deps/usr/include -I/usr/include/luajit-2.0 -I/build/neovim-EtgA2h/neovim-0.1.2ubuntu1+git201603241504+2376+17~ubuntu14.04.1/.deps/usr/include -I/build/neovim-EtgA2h/neovim-0.1.2ubuntu1+git201603241504+2376+17~ubuntu14.04.1/.deps/usr/include -I/build/neovim-EtgA2h/neovim-0.1.2ubuntu1+git201603241504+2376+17~ubuntu14.04.1/.deps/usr/include -I/build/neovim-EtgA2h/neovim-0.1.2ubuntu1+git201603241504+2376+17~ubuntu14.04.1/.deps/usr/include -I/usr/include -I/build/neovim-EtgA2h/neovim-0.1.2ubuntu1+git201603241504+2376+17~ubuntu14.04.1/build/src/nvim/auto -I/build/neovim-EtgA2h/neovim-0.1.2ubuntu1+git201603241504+2376+17~ubuntu14.04.1/build/include
Compiled by buildd@lgw01-24

Optional features included (+) or not (-): +acl   +iconv    +jemalloc
For differences from Vim, see :help vim-differences

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/usr/share/nvim"

• Operating system:
  Linux 16.0-67-generic #87~14.04.1-Ubuntu SMP Fri Mar 11 00:26:02 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
• Terminal emulator:
  Iterm Build 2.9.20160313 over SSH
  

  Actual behaviour

".vimrc" 622L, 17976C
function provider#python3#Call[9]..remote#host#Require[13]..provider#pythonx#Require, line 15
Vim(if):Channel was closed by the client
Failed to load python3 host. You can try to see what happened by starting Neovim with the environment variable $NVIM_PYTHON_LOG_FILE set to a file and opening t
he generated log file. Also, the host stderr will be available in Neovim log, so it may contain useful information. See also ~/.nvimlog.
Press ENTER or type command to continue

• ~/.nvimlog
• ~/nvim/$NVIM_PYTHON_LOG_FILE

2016-03-28 18:03:46,004 [ERROR @ session.py:run:117] 5331 - Setup error: No module named 'script_host'

Weird, running Neovim as root doesn't give the message.

Using _vim-plug_ to install as followed:

Plug 'SirVer/ultisnips' "{{{
  let g:UltiSnipsExpandTrigger="<c-j>"
  let g:UltiSnipsJumpForwardTrigger="<c-j>"
  let g:UltiSnipsJumpBackwardTrigger="<c-k>"
  let g:UltiSnipsListSnippets="<c-u>"

"}}}

If i comment out this line, problem disappears with neovim

[seletskiy]

@perks: Given, that ultisnips was working with previous versions of neovim and that I do not see any ultisnips related error-messages, my guess is that it's not problem with ultisnips rather than in neovim. So I consider to report issue to the neovim dev.

[SevereOverfl0w]

I've also been seeing an error appear in neovim, slightly different message. Might not be related, but it could be. I can open a new issue if you think so.

Error detected while processing function provider#python3#Call:                                                                                                                                                     
line   18:                                                                                                                                                                                                          
no request handler registered for "python_execute"                                                                                                                                                                  
no request handler registered for "python_execute"                                                                                                                                                                  
Error detected while processing function UltiSnips#FileTypeChanged..provider#python3#Call:                                                                                                                          
line   18:                                                                                                                                                                                                          
no request handler registered for "python_execute"                                                                                                                                                                  
no request handler registered for "python_execute"  

[perks]

I don't know if this is related but also ran across this:

An error occured. This is either a bug in UltiSnips or a bug in a
snippet definition. If you think this is a bug, please report it to
https://github.com/SirVer/ultisnips/issues/new.

Following is the full stack trace:
Traceback (most recent call last):
  File "/home/chris/.vim/plugged/ultisnips/pythonx/UltiSnips/snippet_manager.py", line 61, in wrapper
    return func(self, *args, **kwds)
  File "/home/chris/.vim/plugged/ultisnips/pythonx/UltiSnips/snippet_manager.py", line 848, in _track_change
    before = _vim.buf.line_till_cursor
  File "/home/chris/.vim/plugged/ultisnips/pythonx/UltiSnips/_vim.py", line 46, in line_till_cursor
    _, col = self.cursor
  File "/home/chris/.vim/plugged/ultisnips/pythonx/UltiSnips/_vim.py", line 63, in cursor
    col = byte2col(line, nbyte)
  File "/home/chris/.vim/plugged/ultisnips/pythonx/UltiSnips/compatibility.py", line 40, in byte2col
    line = vim.current.buffer[line - 1]
  File "/usr/local/lib/python3.4/dist-packages/neovim/api/buffer.py", line 34, in __getitem__
    return self._session.request('buffer_get_line', self, idx)
  File "/usr/local/lib/python3.4/dist-packages/neovim/api/nvim.py", line 130, in request
    return walk(self._from_nvim, res, decode=decode)
  File "/usr/local/lib/python3.4/dist-packages/neovim/api/common.py", line 172, in walk
    return fn(obj, *args, **kwargs)
  File "/usr/local/lib/python3.4/dist-packages/neovim/api/nvim.py", line 99, in _from_nvim
    obj = decode_if_bytes(obj, decode)
  File "/usr/local/lib/python3.4/dist-packages/neovim/api/common.py", line 161, in decode_if_bytes
    return obj.decode("utf-8", errors=mode)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 10: invalid start byte

[yoshuawuyts]

In my case running as root does give an error. Running vim does not give this message. For the rest details are exactly the same as OP

[bfredl]

If you get the no request handler registered for "python_execute" you might need to upgrade neovim (master, or 0.1.3 as released should be fine, 0.1.3-dev could be too old)

@perks it looks like you have illegal utf-8 in the buffer. It seems vim+py3 allows retrieving the text using surrogate codepoints, but setting the text then fails (py3 vim.current.line is ok, but vim.current.line = vim.current.line + "x" is not). However neovim errors already on vim.current.line As the goal of the neovim python support is to be as close as possible to vim , this is a neovim bug.

[yoshuawuyts]

I'm on NVIM v0.1.4-40-g4eb5827 with the error of Failed to load python3 host.

[bfredl]

And both pip2 show neovim and pip3 show neovim shows 0.1.7 ?

[yoshuawuyts]

ah, brilliant - I had run upgrade neovim for pip1 and pip2; I hadn't run upgrade for pip3. This has fixed it for me; heaps thanks!

$  sudo pip3 install neovim --upgrade

[seletskiy]

@bfredl: Thanks for investigating!

[stsievert]

I'm also running to a related issue. When I start neovim, I see

Error detected while processing function provider#python3#Call:
line   18:
no request handler registered for "python_execute"

I ran into this issue after reinstalling python (and hence reinstalling the neovim package). This was a clean reinstall using conda 4.0.5. My versions before and after:

| Python install | neovim version |
| :-: | :-: |
| new | 0.1.7 |
| old | 0.1.5 |

The problem disappears when commenting out Plug 'sirver/UltiSnips'. Running sudo nvim does not fix the issue.