Undefined variable: g:python3_host_prog

[jacklenox]

I'm getting the following error when trying to run pathfinder on my installation of Neovim:

Error detected while processing function provider#python3#Call:                                                                                            
line   18:                                                                                                                                                 
Error invoking 'python_execute' on channel 4 (python3-script-host):                                                                                        
Traceback (most recent call last):                                                                                                                         
  File "<string>", line 1, in <module>                                                                                                                     
  File "/home/jack/.local/share/nvim/plugged/pathfinder.vim/pathfinder/client/plugin.py", line 15, in __init__                                             
    self.client = Client()                                                                                                                                 
  File "/home/jack/.local/share/nvim/plugged/pathfinder.vim/pathfinder/client/client.py", line 24, in __init__                                             
    self.open()                                                                                                                                            
  File "/home/jack/.local/share/nvim/plugged/pathfinder.vim/pathfinder/client/client.py", line 34, in open                                                 
    self._build_server_cmd(), stdout=subprocess.PIPE, stderr=subprocess.PIPE                                                                               
  File "/home/jack/.local/share/nvim/plugged/pathfinder.vim/pathfinder/client/client.py", line 58, in _build_server_cmd                                    
    python3_host_prog = vim.eval("g:python3_host_prog")                                                                                                    
  File "/home/jack/.local/lib/python3.9/site-packages/pynvim/plugin/script_host.py", line 205, in eval                                                     
    obj = self.request("vim_eval", expr)                                                                                                                   
  File "/home/jack/.local/lib/python3.9/site-packages/pynvim/api/nvim.py", line 182, in request                                                            
    res = self._session.request(name, *args, **kwargs)                                                                                                     
  File "/home/jack/.local/lib/python3.9/site-packages/pynvim/msgpack_rpc/session.py", line 102, in request                                                 
    raise self.error_wrapper(err)                                                                                                                          
pynvim.api.common.NvimError: Vim:E121: Undefined variable: g:python3_host_prog

This is from my :checkhealth:

## Python 3 provider (optional)
  - INFO: `g:python3_host_prog` is not set.  Searching for python3 in the environment.
  - INFO: Multiple python3 executables found.  Set `g:python3_host_prog` to avoid surprises.
  - INFO: Executable: /home/linuxbrew/.linuxbrew/bin/python3
  - INFO: Other python executable: /usr/bin/python3
  - INFO: Other python executable: /bin/python3
  - INFO: Python version: 3.9.13
  - INFO: pynvim version: 0.4.3
  - OK: Latest pynvim is installed.

And this is my version info:

NVIM v0.7.0
Build type: RelWithDebInfo
LuaJIT 2.1.0-beta3
Compilation: /usr/bin/cc -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -DNVIM_TS_HAS_SET_MATCH_LIMIT -DNVIM_TS_HAS_SET_ALLOCATOR -O2 -g -Og -g -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion -Wdouble-promotion -Wmissing-noreturn -Wmissing-format-attribute -Wmissing-prototypes -Wimplicit-fallthrough -Wsuggest-attribute=pure -Wsuggest-attribute=const -Wvla -fstack-protector-strong -fno-common -fdiagnostics-color=always -DINCLUDE_GENERATED_DECLARATIONS -D_GNU_SOURCE -DNVIM_MSGPACK_HAS_FLOAT32 -DNVIM_UNIBI_HAS_VAR_FROM -DMIN_LOG_LEVEL=3 -I/build/nvim/parts/nvim/build/build/config -I/build/nvim/parts/nvim/build/src -I/build/nvim/parts/nvim/build/.deps/usr/include -I/usr/include -I/build/nvim/parts/nvim/build/build/src/nvim/auto -I/build/nvim/parts/nvim/build/build/include
Compiled by root@lcy02-amd64-012

Features: +acl +iconv +tui
See ":help feature-compile"

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

[danth]

I've pushed a possible fix for this - could you try it again?

[jacklenox]

@danth That's got it, thank you for the speedy fix!