Edit file in host Neovim instance from a :terminal buffer

nvim-terminal-edit.py

#!/usr/bin/env python2.7
"""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:]
if not args:
    print("Usage: {} <filename> ...".format(sys.argv[0]))
    sys.exit(1)

addr = os.environ.get("NVIM_LISTEN_ADDRESS", None)
if not addr:
    os.execvp('nvim', args)

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

abs_args = []
for i in args:
    abs_args.append(os.path.abspath(i))

def _setup():
    nvim.input('<c-\\><c-n>')  # exit terminal mode
    chid = nvim.channel_id
    nvim.command('augroup EDIT')
    nvim.command('au BufEnter <buffer> call rpcnotify({0}, "n")'.format(chid))
    #nvim.command('au BufEnter <buffer> startinsert'.format(chid))
    nvim.command('augroup END')
    nvim.vars['files_to_edit'] = abs_args
    for x in abs_args:
        nvim.command('exe "tab drop ".remove(g:files_to_edit, 0)')
        nvim.input('<Esc>')


def _exit(*args):
    nvim.vars['files_to_edit'] = None
    nvim.command('augroup EDIT')
    nvim.command('au!')
    nvim.command('augroup END')
    nvim.stop_loop()


nvim.run_loop(_exit, _exit, _setup)