neovim: Set up python3 virtualenv in postinstall

neovim/init.vim

@@ -4,7 +4,7 @@ endif
 
 let &shell = '/bin/sh'
 let g:python3_host_prog = expand('~/.virtualenvs/neovim3/bin/python')
-let g:python_host_prog  = expand('~/.virtualenvs/neovim2/bin/python')
+let g:loaded_python_provider = 0 " Disable python2 support for plugins
 
 call plug#begin('~/.local/share/nvim/plugged')
 if filereadable(expand("~/.config/nvim/os-plugins.vim"))

neovim/postinstall

@@ -1,8 +1,10 @@
 #!/usr/bin/env bash
 
 set -euo pipefail
+set -x
 
-CURDIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+[ -d ~/.virtualenvs/neovim3 ] || python3 -m venv ~/.virtualenvs/neovim3
+~/.virtualenvs/neovim3/bin/python -c 'import neovim' || ~/.virtualenvs/neovim3/bin/pip install neovim
 
 # https://github.com/junegunn/vim-plug/wiki/tips#install-plugins-on-the-command-line
 nvim -es -u ~/.config/nvim/init.vim -i NONE -c "PlugInstall" -c "qa"