nvim-inner

#!/usr/bin/python
"""Edit a file in the host nvim instance."""
import os
import sys

try:
    from pynvim import attach
except ImportError:
    try:
        from neovim import attach
    except ImportError:
        print("WARNING: don't have nvim python module, launching without it")
        attach = None

args = sys.argv[1:]
if not args or len(args) > 1:
    print "Usage: {} <filename>".format(sys.argv[0])
    sys.exit(1)


def which(program):
    import os
    def is_exe(fpath):
        return os.path.isfile(fpath) and os.access(fpath, os.X_OK)

    fpath, fname = os.path.split(program)
    if fpath:
        if is_exe(program):
            return program
    else:
        for path in os.environ["PATH"].split(os.pathsep):
            path = path.strip('"')
            exe_file = os.path.join(path, program)
            if is_exe(exe_file) and os.path.abspath(exe_file) != os.path.abspath(__file__):
                return exe_file

    return None

addr = os.environ.get("NVIM_LISTEN_ADDRESS", None)
if not addr or not args:
    if addr:
        print("Launching from inside nvim, but no pynvim available - cancelling")
        sys.exit()
    try:
        os.execvp('nvim', ["nvim", "-p"] + args)
    except OSError:
        print("Missing nvim, trying vim")
        os.execvp(which('vim'), ["vim", "-p"] + args)

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


def fullpath(*args):
    _p = os.path
    return _p.abspath(_p.normpath(_p.expanduser(_p.join(*args))))
    del _p

def setup():
    global termbuf
    nvim.input('<c-\\><c-n>')  # exit terminal mode
    nvim.command
    chid = nvim.channel_id
    termbuf = nvim.eval('bufnr("%")')
    nvim.vars['file_to_edit'] = fullpath(args[0])
    nvim.command('exe "below new ".g:file_to_edit')
    # nvim.command('noremap <buffer> :wqa :wq')
    # nvim.command('noremap <buffer> :qa :q')
    # nvim.command('noremap <buffer> :qa! :q!')
    # nvim.command('noremap <buffer> :wqa! :wq!')
    nvim.command('setlocal bufhidden=wipe')
    nvim.command('augroup TERMEDIT')
    nvim.command('highlight StatusLine ctermfg=red')
    nvim.command('au BufUnload <buffer> call rpcnotify({0}, "n")'.format(chid))
    nvim.command('au BufEnter <buffer> highlight StatusLine ctermfg=red')
    nvim.command('au BufLeave <buffer> highlight StatusLine ctermfg=blue')
    nvim.command('augroup END')

def exit(*a, **kw):
    try:
        nvim.vars['file_to_edit'] = None
        swb = nvim.eval("&swb")
        nvim.command('set swb=useopen,usetab')
        nvim.command('augroup TERMEDIT')
        nvim.command('au!')
        nvim.command('augroup END')
        nvim.command('sb %s' % termbuf)
        nvim.command('set swb=' + (swb or ''))
        nvim.input('i')
        nvim.stop_loop()
    except:
        import traceback
        traceback.print_exc()
        sys.stdout.flush()
        sys.stderr.flush()
        sys.exit(1)


nvim.run_loop(exit, exit, setup)