Edit file in host Neovim instance from a :terminal buffer

nvim-terminal-edit.py

#!/home/bwillard/apps/anaconda3/envs/neovim3/bin/python
"""Edit a file in the host nvim instance."""
from __future__ import print_function
import os
import sys

from neovim import attach

args = sys.argv[1:]

addr = os.environ.get("NVIM_LISTEN_ADDRESS", None)

if not addr:
    os.execvp('nvim', ['nvim'] + args)

# If no arguments are given, it will simply exit terminal mode.
#if not args:
#    print("Usage: {} <filename> ...".format(sys.argv[0]))
#    sys.exit(1)

nvim = attach("socket", path=addr)


def _setup():
    nvim.input('<c-\\><c-n>')
    chid = nvim.channel_id
    nvim.command('augroup EDIT')
    nvim.command('au BufEnter <buffer> call rpcnotify({}, "n")'.format(chid))
    nvim.command('au BufEnter <buffer> startinsert')
    nvim.command('augroup END')
    for arg in args:
        if os.path.isfile(arg):
            file_name = os.path.realpath(arg)
            nvim.command('exe "drop {}"'.format(file_name))


def _exit(*args):
    nvim.command('augroup EDIT')
    nvim.command('au!')
    nvim.command('augroup END')
    nvim.stop_loop()


nvim.run_loop(_exit, _exit, _setup)