Error when python venv in same directory

[Ben Barbour]

I get this when loading a python file, ever since I ran: 'python -m venv .venv

error caught while executing async callback:
NvimError(b'Vim(syntax):E339: Pattern too long',)
Traceback (most recent call last):
File "/home/ben/.bbenv/config/nvim/plugged/neotags.nvim/rplugin/python3/neotags/neotags.py", line 52, in init
self.highlight()
File "/home/ben/.bbenv/config/nvim/plugged/neotags.nvim/rplugin/python3/neotags/neotags.py", line 158, in highlight
[self.__vim.command(cmd) for cmd in cmds]
File "/home/ben/.bbenv/config/nvim/plugged/neotags.nvim/rplugin/python3/neotags/neotags.py", line 158, in
[self.__vim.command(cmd) for cmd in cmds]
File "/home/ben/.local/lib/python3.5/site-packages/neovim/api/nvim.py", line 218, in command
return self.request('nvim_command', string, **kwargs)
File "/home/ben/.local/lib/python3.5/site-packages/neovim/api/nvim.py", line 131, in request
res = self._session.request(name, *args, **kwargs)
File "/home/ben/.local/lib/python3.5/site-packages/neovim/msgpack_rpc/session.py", line 98, in request
raise self.error_wrapper(err)
neovim.api.nvim.NvimError: b'Vim(syntax):E339: Pattern too long'

the call was requested at
File "/home/ben/.local/lib/python3.5/site-packages/neovim/api/nvim.py", line 171, in filter_notification_cb
notification_cb(name, args)
File "/home/ben/.local/lib/python3.5/site-packages/neovim/plugin/host.py", line 108, in _on_notification
handler(*args)
File "/home/ben/.local/lib/python3.5/site-packages/neovim/plugin/host.py", line 70, in _wrap_function
return fn(*args)
File "/home/ben/.bbenv/config/nvim/plugged/neotags.nvim/rplugin/python3/neotags/init.py", line 21, in init
self.__vim.async_call(self.__neotags.init)

I noticed that the .tags file has a lot of the information found in the .venv folder. Is there a way to exclude it?

[c0r73x]

Hi, you can add an exclude to your ~/.ctags file --exclude=.venv or you can add it to your vimrc

    let g:neotags_ctags_args = [
                \ '--fields=+l',
                \ '--c-kinds=+p',
                \ '--c++-kinds=+p',
                \ '--sort=no',
                \ '--extras=+q'
                \ '--exclude=.venv'
                \ ]

Or if you use the_silver_searcher you can add it to ~/.agignore.

[Ben Barbour]

I think that worked for python, but now I'm getting the same error on a C++ project. Not exactly sure what is causing it there.

[Ben Barbour]

Oh, actually, it's not quite the same

error caught while executing async callback:
NvimError(b'Vim(syntax):E339: Pattern too long',)
Traceback (most recent call last):
  File "/home/ben/.bbenv/config/nvim/plugged/neotags.nvim/rplugin/python3/neotags/neotags.py", line 72, in update
    self.highlight()
  File "/home/ben/.bbenv/config/nvim/plugged/neotags.nvim/rplugin/python3/neotags/neotags.py", line 158, in highlight
    [self.__vim.command(cmd) for cmd in cmds]
  File "/home/ben/.bbenv/config/nvim/plugged/neotags.nvim/rplugin/python3/neotags/neotags.py", line 158, in <listcomp>
    [self.__vim.command(cmd) for cmd in cmds]
  File "/home/ben/.local/lib/python3.5/site-packages/neovim/api/nvim.py", line 218, in command
    return self.request('nvim_command', string, **kwargs)
  File "/home/ben/.local/lib/python3.5/site-packages/neovim/api/nvim.py", line 131, in request
    res = self._session.request(name, *args, **kwargs)
  File "/home/ben/.local/lib/python3.5/site-packages/neovim/msgpack_rpc/session.py", line 98, in request
    raise self.error_wrapper(err)
neovim.api.nvim.NvimError: b'Vim(syntax):E339: Pattern too long'

the call was requested at
  File "/home/ben/.local/lib/python3.5/site-packages/neovim/api/nvim.py", line 171, in filter_notification_cb
    notification_cb(name, args)
  File "/home/ben/.local/lib/python3.5/site-packages/neovim/plugin/host.py", line 108, in _on_notification
    handler(*args)
  File "/home/ben/.local/lib/python3.5/site-packages/neovim/plugin/host.py", line 70, in _wrap_function
    return fn(*args)
  File "/home/ben/.bbenv/config/nvim/plugged/neotags.nvim/rplugin/python3/neotags/__init__.py", line 29, in update
    self.__vim.async_call(self.__neotags.update)

[c0r73x]

I think I know why you get that error, I will fix it.

[Ben Barbour]

Thanks! :)

I'm not sure if you're done yet, but I saw your latest commit and tried it out with various values for let g:neotags_patternlength = x, and it is still happening. I tried it with 4096, 9999, and 99999999.

[c0r73x]

The patternlength is the max length of the pattern in :syntax. I cant remember exactly what the max value is but 1024 should be fine, before it was 2048. However it seems thats not why you get the error.

I will have to do some tests to see if I can trigger the error.

[Ben Barbour]

I just double-checked it without me explicitly setting the value, and it seems to also happen with the 1024 default.

[c0r73x]

I've done some major changes to the code, do you still get the same error?