Not showing arguments with deoplete + rtags

[qwence]

I'm using deoplete with rzaluska/deoplete-rtags for C++. As you can see in the screencast below, deoplete is correctly recognizing the signature of the function being typed, but echodoc only gives the popup myfunc() instead of myfunc(int x, int y).

Screencast: https://asciinema.org/a/VI5qopfM7kckYpqYZHMoWAj72

Minimal init.vim

set nocompatible
colorscheme delphi
filetype plugin indent on
syntax enable
set mouse=a
filetype off
set rtp+=~/.vim/bundle/Vundle.vim
call vundle#begin()
Plugin 'VundleVim/Vundle.vim'
Plugin 'Shougo/deoplete.nvim'
Plugin 'rzaluska/deoplete-rtags'
Plugin 'Shougo/echodoc.vim'
call vundle#end()            " required
filetype plugin indent on    " required

let g:deoplete#enable_at_startup = 1

let g:echodoc#enable_at_startup = 1
let g:echodoc#type = 'floating'
highlight link EchoDocFloat Pmenu

example.cpp

#include <iostream>

int myfunc(int x, int y){
    return x+y;
}

int main(int argv, char** argc){
    std::cout << myfunc(5,6);
}

Makefile (for the rtags setup)

sample:
    g++ -g -o./example example.cpp -I./ -std=c++14 -O0 -Wfatal-errors

Instructions for using the rtags plugin (after installing it): install rtags and bear, copy example.cpp and Makefile into a directory, and run

bear -- make
rdm &
rc -J
rc --reindex

[Shougo]

Fixed.

[qwence]

Thanks for looking into this! I tried the updated version on the example above and am getting the following error after entering insert mode and typing one character:

[deoplete] Traceback (most recent call last):
  File "/home/qwence/.vim/bundle/deoplete.nvim/rplugin/python3/deoplete/child.py", line 203, in _gather_results
    result = self._get_result(context, source)
  File "/home/qwence/.vim/bundle/deoplete.nvim/rplugin/python3/deoplete/child.py", line 267, in _get_result
    ctx['candidates'] = source.gather_candidates(ctx)
  File "/home/qwence/.vim/bundle/deoplete-rtags/rplugin/python3/deoplete/sources/deoplete_rtags.py", line 44, in gather_candidates
    completions_json = json.loads(stdout_data_decoded)
  File "/usr/lib/python3.9/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python3.9/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python3.9/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
Error from rtags: Expecting value: line 1 column 1 (char 0)  Use :messages / see above for error details.

[Shougo]

It is not deoplete or echodoc problem. It is deoplete-rtags problem. The json data seems broken.

[Shougo]

https://github.com/rzaluska/deoplete-rtags/blob/master/rplugin/python3/deoplete/sources/deoplete_rtags.py#L44

It should catch JSON errors.

[Shougo]

You can create issue for deoplete-rtags but it is old source. It may not be supported.

[qwence]

Never mind; it works now. (It turns out I'd accidentally killed rdm so that was producing an error message instead of json.) Thanks for the fix!

[Shougo]

Oh, OK.

[Shougo]

I have created ddc-rtags. You can use it instead.

https://github.com/Shougo/ddc-rtags