Xieby1's Nix/NixOS Config

{ pkgs, ... }: {
  home.packages = with pkgs; [
    universal-ctags
  ];
  home.file.exclude_ctags = {
    text = ''
      # exclude ccls generated directories
      --exclude=.ccls*
    '';
    target = ".config/ctags/exclude.ctags";
  };
  home.file.scala_ctags = {
    target = ".config/ctags/scala.ctags";
    text = ''
      --langdef=Scala
      --langmap=Scala:.scala
      --regex-Scala=/^[ \t]*class[ \t]*([a-zA-Z0-9_]+)/\1/c,classes/
      --regex-Scala=/^[ \t]*object[ \t]*([a-zA-Z0-9_]+)/\1/o,objects/
      --regex-Scala=/^[ \t]*trait[ \t]*([a-zA-Z0-9_]+)/\1/t,traits/
      --regex-Scala=/^[ \t]*case[ \t]*class[ \t]*([a-zA-Z0-9_]+)/\1/r,cclasses/
      --regex-Scala=/^[ \t]*abstract[ \t]*class[ \t]*([a-zA-Z0-9_]+)/\1/a,aclasses/
      --regex-Scala=/^[ \t]*def[ \t]*([a-zA-Z0-9_=]+)[ \t]*.*[:=]/\1/m,methods/
      --regex-Scala=/[ \t]*val[ \t]*([a-zA-Z0-9_]+)[ \t]*[:=]/\1/V,values/
      --regex-Scala=/[ \t]*var[ \t]*([a-zA-Z0-9_]+)[ \t]*[:=]/\1/v,variables/
      --regex-Scala=/^[ \t]*type[ \t]*([a-zA-Z0-9_]+)[ \t]*[\[<>=]/\1/T,types/
      --regex-Scala=/^[ \t]*import[ \t]*([a-zA-Z0-9_{}., \t=>]+$)/\1/i,includes/
      --regex-Scala=/^[ \t]*package[ \t]*([a-zA-Z0-9_.]+$)/\1/p,packages/
    '';
  };
  programs.neovim = {
    extraConfig = ''
      "" tags support, ';' means upward search, refering to http://vimdoc.sourceforge.net/htmldoc/editing.html#file-searching
      set tags=./tags;
    '';
    plugins = [{

A bug in neovim or lspconfig?

I want to jump to the definition of QEMU's qemu_clock_get_ns using ctags. More specifically, when I press g] with my cursor under a qemu_clock_get_ns call, neovim only lists one definition:

  # pri kind tag                file
  1 F   Functionqemu_clock_get_ns /home/xieby1/Codes/qemu/tests/unit/ptimer-test-stubs.c
               \%86l\%9c
Type number and <Enter> (q or empty cancels):

However, there should be two definitions! After tweaking a lot, I found out that clangd's lspconfig config directly or indirectly causes this.

require('lspconfig').clangd.setup{
  filetypes = { "c", "cc", "cpp", "c++", "objc", "objcpp", "cuda", "proto" }
}

As long as the filetype of the current buffer is not clangd-related, ctags works correctly. For example, if I cd <qemu-source-code>, then run vim, and finally :ts qemu_clock_get_ns, I get the expected result:

  # pri kind tag                file
  1 F   f    qemu_clock_get_ns  tests/unit/ptimer-test-stubs.c
               typeref:typename:int64_t
               int64_t qemu_clock_get_ns(QEMUClockType type)
  2 F   f    qemu_clock_get_ns  util/qemu-timer.c
               typeref:typename:int64_t
               int64_t qemu_clock_get_ns(QEMUClockType type)
Type number and <Enter> (q or empty cancels):

I searched through neovim's and nvim-lspconfig's github issues but didn't find any related issues. I also tried searching for the weird string \%.*l\%.*c (%86l%9c) in neovim and lspconfig source code, but found nothing.

As a result, I've decided to use a wrapper plugin for tags functionality.

nvim-telescope has builtin support tags :lua require'telescope.builtin'.tags{}. However it is VERY SLOW! So, I choose to install a plugin: nvim-telescope-ctags-plus.

      plugin = pkgs.vimUtils.buildVimPlugin {
        name = "nvim-telescope-ctags-plus";
        src = pkgs.fetchFromGitHub {
          owner = "gnfisher";
          repo = "nvim-telescope-ctags-plus";
          rev = "455f24c0dcc6126c89cd3a3278e3fe322df061b1";
          hash = "sha256-P9uYkWvY4NzwlAxG40/0sNZoGEHezDhlYL/gKfBI/dA=";
        };
      };
      type = "lua";
      config =''
        require('telescope').load_extension('ctags_plus')

        -- in vimscript:
        -- nnoremap g] <cmd>lua require('telescope').extensions.ctags_plus.jump_to_tag()<cr>
        vim.keymap.set('n', 'g]', function()
          require('telescope').extensions.ctags_plus.jump_to_tag()
        end, { noremap = true, silent = true })
      '';
    }];
  };
}