"Undefined variable: max_length" when trying to connect Neovim with Firefox

[maxigaz]

I have the following error message when I run :GhostStart in Neovim, focus a text area on github.com and then click on the GhostText addon's icon in Firefox:

error caught while executing async callback:
NvimError(b'Vim(echo):E121: Undefined variable: max_length',)
Traceback (most recent call last):
  File "/home/xxx/.config/nvim/plugged/vim-ghost/rplugin/python3/ghost.py", line 178, in _handle_on_message
    max_length=50)
TypeError: slugify() got an unexpected keyword argument 'max_length'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/home/xxx/.config/nvim/plugged/vim-ghost/rplugin/python3/ghost.py", line 198, in _handle_on_message
    self.nvim.command("echo '%s'" % ex)
  File "/usr/lib/python3.6/site-packages/neovim/api/nvim.py", line 217, in command
    return self.request('nvim_command', string, **kwargs)
  File "/usr/lib/python3.6/site-packages/neovim/api/nvim.py", line 130, in request
    res = self._session.request(name, *args, **kwargs)
  File "/usr/lib/python3.6/site-packages/neovim/msgpack_rpc/session.py", line 97, in request
    raise self.error_wrapper(err)
neovim.api.nvim.NvimError: b'Vim(echo):E121: Undefined variable: max_length'

the call was requested at
  File "/usr/lib/python3.6/site-packages/SimpleWebSocketServer/SimpleWebSocketServer.py", line 566, in _parseMessag
e
    self._handlePacket()
  File "/usr/lib/python3.6/site-packages/SimpleWebSocketServer/SimpleWebSocketServer.py", line 238, in _handlePacke
t
    self.handleMessage()
  File "/home/xxx/.config/nvim/plugged/vim-ghost/rplugin/python3/ghost.py", line 36, in handleMessage
    self.server.context.on_message(req, self)
  File "/home/xxx/.config/nvim/plugged/vim-ghost/rplugin/python3/ghost.py", line 214, in on_message
    self.nvim.async_call(self._handle_on_message, req, websocket)
Press ENTER or type command to continue

After this message, I see a popup message in Firefox that the addon has successfully connected to the editor, yet there's no sync between the browser window and Neovim when I edit inside either one.

By the way, I'm not sure if it's related, but I'd also like to mention that even though I added Plug 'raghur/vim-ghost', {'do': ':GhostInstall'} to my vimrc, I had to install simple-websocket-server with sudo pip install git+https://github.com/dpallot/simple-websocket-server.git and python-slugify with sudo pip install slugify, otherwise I would get an error message on running :GhostInstall that these modules were missing.

Running Manjaro Linux, Neovim v0.2.2, Python 3.6.4, and Firefox 58.0.2.

[mcepl]

I guess it is the same with neovim 0.2.2, Python 3.4.5, and Firefox 59.0b14 on RHEL 7.5

[raghur]

By the way, I'm not sure if it's related, but I'd also like to mention that even though I added Plug 'raghur/vim-ghost', {'do': ':GhostInstall'} to my vimrc, I had to install simple-websocket-server with sudo pip install git+https://github.com/dpallot/simple-websocket-server.git and python-slugify with sudo pip install slugify, otherwise I would get an error message on running :GhostInstall that these modules were missing.

Can you check permissions on the install script (top level of plugin folder)? GhostInstall just installs these dependencies with pip install --user

[mcepl]

Pro mě to je -rwxrwxr-x. (775)

[raghur]

That's wierd... so install does have execute perms. What happens if you run ./install from the ghost folder from the terminal? I'm at a loss to understand why the installlation doesn't work.

[mcepl]

It does what it is supposed to do.

matej@mitmanek: vim-ghost (master)$ ./install 
Collecting git+https://github.com/dpallot/simple-websocket-server.git (from -r requirements_posix.txt (line 1))
  Cloning https://github.com/dpallot/simple-websocket-server.git to /tmp/pip-dmnazwsc-build
Collecting python-slugify (from -r requirements_posix.txt (line 2))
  Downloading python_slugify-1.2.4-py2.py3-none-any.whl
Collecting Unidecode>=0.04.16 (from python-slugify->-r requirements_posix.txt (line 2))
  Downloading Unidecode-1.0.22-py2.py3-none-any.whl (235kB)
    100% |████████████████████████████████| 235kB 1.7MB/s 
Installing collected packages: Unidecode, python-slugify, SimpleWebSocketServer
  Running setup.py install for SimpleWebSocketServer ... done
Successfully installed SimpleWebSocketServer-0.1.0 Unidecode-1.0.22 python-slugify-1.2.4
matej@mitmanek: vim-ghost (master)$

[mcepl]

Actually, it might be the problem with having two python3 interpreters on my system. And while neovim uses python3.4, pip3 is for python3.6. Better to follow David Beazley’s example and run python3 -mpip install.

[raghur]

Sounds good - just pushed 842730b

[maxigaz]

Can you check permissions on the install script (top level of plugin folder)?

install had rwxr-xr-x while install.cmd had rw-r--r--. I changed both to 775, so now :GhostInstall works without any errors.

However, I still get an error message when I click on the icon of the addon in Firefox:

error caught while executing async callback:
NvimError(b'Vim(echo):E121: Undefined variable: edit',)
Traceback (most recent call last):
  File "/home/xxx/.config/nvim/plugged/vim-ghost/rplugin/python3/ghost.py", line 182, in _handle_on_message
    self.nvim.command("ed %s" % temp_file_name)
  File "/usr/lib/python3.6/site-packages/neovim/api/nvim.py", line 242, in command
    return self.request('nvim_command', string, **kwargs)
  File "/usr/lib/python3.6/site-packages/neovim/api/nvim.py", line 140, in request
    res = self._session.request(name, *args, **kwargs)
  File "/usr/lib/python3.6/site-packages/neovim/msgpack_rpc/session.py", line 98, in request
    raise self.error_wrapper(err)
neovim.api.nvim.NvimError: b'Vim(edit):E37: No write since last change (add ! to override)'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/home/xxx/.config/nvim/plugged/vim-ghost/rplugin/python3/ghost.py", line 198, in _handle_on_message
    self.nvim.command("echo '%s'" % ex)
  File "/usr/lib/python3.6/site-packages/neovim/api/nvim.py", line 242, in command
    return self.request('nvim_command', string, **kwargs)
  File "/usr/lib/python3.6/site-packages/neovim/api/nvim.py", line 140, in request
    res = self._session.request(name, *args, **kwargs)
  File "/usr/lib/python3.6/site-packages/neovim/msgpack_rpc/session.py", line 98, in request
    raise self.error_wrapper(err)
neovim.api.nvim.NvimError: b'Vim(echo):E121: Undefined variable: edit'

the call was requested at
  File "/home/xxx/.local/lib/python3.6/site-packages/SimpleWebSocketServer/SimpleWebSocketServer.py", line 566,
in _parseMessage
    self._handlePacket()
  File "/home/xxx/.local/lib/python3.6/site-packages/SimpleWebSocketServer/SimpleWebSocketServer.py", line 238,
in _handlePacket
    self.handleMessage()
  File "/home/xxx/.config/nvim/plugged/vim-ghost/rplugin/python3/ghost.py", line 36, in handleMessage
    self.server.context.on_message(req, self)
  File "/home/xxx/.config/nvim/plugged/vim-ghost/rplugin/python3/ghost.py", line 214, in on_message
    self.nvim.async_call(self._handle_on_message, req, websocket)

[raghur]

install had rwxr-xr-x while install.cmd had rw-r--r--. I changed both to 775, so now :GhostInstall works without any errors.

What OS are you on? In either case, you shouldn't need to change perms manually - already verified that executable is set for ./install. install.cmd is only for windows.

What does the following return in nvim:

:set hidden?

[mcepl]

hidden for me.

[raghur]

@maxigaz - I could repro your error only if I set nohidden... @mcepl - I'm assuming that you're not seeing the same stacktrace as @maxigaz ?

[mcepl]

No, I don't. With fixes shown above, everything works for me.

[maxigaz]

@raghur I'm still using Manjaro Linux, but you were right about :set hidden?. The return value was nohidden, and setting it to hidden did the trick.

Thank you for your help and this great plugin!