NameError: name 'vim' is not defined when in neovim

[theniceboy]

Describe the bug
I am trying to setup Vimspector with Neovim, and I am getting this error when I call vimspector#Launch():

Error detected while processing function vimspector#internal#state#Reset[8]..provider#python3#Call:
line   18:
Error invoking 'python_execute' on channel 8 (python3-script-host):
Traceback (most recent call last):
  File "<string>", line 2, in <module>
NameError: name 'vim' is not defined
Error detected while processing function vimspector#Continue[1]..provider#python3#Call:
line   18:
Error invoking 'python_execute' on channel 8 (python3-script-host):
Traceback (most recent call last):
  File "<string>", line 1, in <module>
NameError: name '_vimspector_session' is not defined

My NeoVim has both python2 and 3 support. (pynvim installed)

To Reproduce
I followed this issue and added

Plug 'puremourning/vimspector', {'do': './install_gadget.py --enable-c --enable-python'}

to my init.vim.

When I :call vimspector#ToggleBreakpoint() or :call vimspector#Launch(), I would get the error listed above.

Vimspector config file:

{
  "configurations": {
    "<name>: Launch": {
      "adapter": "vscode-cpptools",
      "configuration": {
        "name": "<name>",
        "type": "cppdbg",
        "request": "launch",
        "program": "${workspaceRoot}/debug/neodm",
        "cwd": "${workspaceRoot}",
        "externalConsole": true,
        "stopAtEntry": true,
        "MIMode": "gdb"
      }
    },
    "<name>: Attach": {
      "adapter": "vscode-cpptools",
      "configuration": {
        "name": "<name>: Attach",
        "type": "cppdbg",
        "request": "attach",
        "program": "${workspaceRoot}/debug/neodm",
        "MIMode": "gdb"
      }
    }
  }
}

(~/.vimspector.log is empty)

Environemnt

• Output of vim --version

NVIM v0.4.3
Build type: Release
LuaJIT 2.0.5
Compilation: /usr/bin/cc -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -O2 -DNDEBUG -DMIN_LOG_LEVEL=3 -Wall -Wextra -pedantic -Wno-unu
sed-parameter -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion -Wmissing-prototypes -Wimplicit-fallthrough -Wvla -fstack-protector-s
trong -fdiagnostics-color=always -DINCLUDE_GENERATED_DECLARATIONS -D_GNU_SOURCE -DNVIM_MSGPACK_HAS_FLOAT32 -DNVIM_UNIBI_HAS_VAR_FROM -I/
build/neovim/src/build/config -I/build/neovim/src/neovim-0.4.3/src -I/usr/include -I/build/neovim/src/build/src/nvim/auto -I/build/neovi
m/src/build/include
Compiled by builduser

Features: +acl +iconv +tui

• Output of which vim:

/usr/bin/vim (sym linked to /usr/bin/nvim)

• Output of :py3 pass:

• Operating system: and version
  Up-to-date Arch Linux

[puremourning]

Error invoking 'python_execute' on channel 8 (python3-script-host):
Traceback (most recent call last):
File "", line 2, in
NameError: name 'vim' is not defined

this suggests that your neovim is broken or not correctly installed.

Please check :checkhealth and paste the output of :py3 import vim and following that :py3 print( vim.version )

[mellery451]

FWIW, I have exactly the same errors reported here when running through the demo using neovim (latest version 0.4.3). checkhealth is all green for me. Demo works perfectly with vim8 on the same system with same vimrc.

[puremourning]

hmm ok let me have a look. But I need a solid reproducible case, as this doesn't repro for me.

[puremourning]

OK I think there is yet-another-neovim-vs-vim-incompatibility.

In Vim, the vim module is always (automatically) imported. Apparently in neovim it isn't. I'll ask the neovim people, but I can see where this is going ...

[puremourning]

can you try applying this patch locally to see if it fixes it :

in autoload/vimspector/internal/state.vim, before from vimspector import debug_session, add import vim as in:

function! vimspector#internal#state#Reset() abort
  let prefix = ''
  if s:is_neovim
    let prefix='neo'
  endif
    py3 << EOF
import vim
from vimspector import debug_session
_vimspector_session = debug_session.DebugSession( vim.eval( 'prefix' ) )
EOF
endfunction

[mellery451]

🎆 ...that worked for me.

[puremourning]

neovim/neovim#11783

I'll fix this in vimspector. standby.