Revert back to basic ctags navigation

LSP based navigation in a header-centric codebase turned out to be not
that much better than plain ctags. The latter has the advantage of being
both the most performant and most simple to setup.

The main problem with e.g. cquery is that its underlying JSON compilation
database only maintains information on compilation units i.e. cpp files.
In this situation navigation in header files frequently reverts back to
plain guessing which provides no advantage over ctags.

Added vim-gutentags for automatic regeneration on file save.

3 files changed, 4 insertions, 62 deletions

diff --git a/pkgs/custom-neovim/asset/rc.vim b/pkgs/custom-neovim/asset/rc.vim
index 31eb27a..6675cce 100644
--- a/pkgs/custom-neovim/asset/rc.vim
+++ b/pkgs/custom-neovim/asset/rc.vim
@@ -36,8 +36,8 @@ let mapleader=","
 
 map <leader>s  :let @/=""<CR>
 map <leader>c  zz
-map <leader>d  <c-]>
 map <leader>h  q:
+map <leader>d  g<C-]>
 
 nmap <backspace> :e#<CR>
 nmap f           za
@@ -123,45 +123,5 @@ let g:undotree_SetFocusWhenToggle = 1
 let g:localvimrc_sandbox    = 0
 let g:localvimrc_persistent = 2
 
-let g:wordmotion_prefix = '<Leader>'
-nmap <S-w> <Leader>w
-
-let g:lsp_auto_enable = 0
-
-" spinning up a language client only makes
-" sense if such a client is available
-if executable('cquery')
-	let g:lsp_auto_enable = 1
-
-	autocmd User lsp_setup call lsp#register_server({
-		\ 'name': 'cquery',
-		\ 'cmd': {server_info->['cquery']},
-		\ 'root_uri': {server_info->lsp#utils#path_to_uri(lsp#utils#find_nearest_parent_file_directory(lsp#utils#get_buffer_path(), 'compile_commands.json'))},
-		\ 'initialization_options': { 'cacheDirectory': '/tmp/cquery' },
-		\ 'whitelist': ['c', 'cpp', 'cc'],
-		\ })
-
-	nnoremap <silent> gd :LspDefinition<CR>
-	nnoremap <silent> gt :LspTypeDefinition<CR>
-	nnoremap <silent> gi :LspImplementation<CR>
-	nnoremap <silent> gr :LspReferences<CR>
-	nnoremap <c-t> :LspWorkspaceSymbol<CR>
-	nnoremap <a-t> :LspDocumentSymbol<CR>
-
-	autocmd FileType cpp setlocal omnifunc=lsp#complete
-	set completeopt=longest,menuone,preview
-	" use enter to select completion item
-	inoremap <expr> <CR> pumvisible() ? "\<C-y>" : "\<C-g>u\<CR>"
-	" improve popup and selection behavior
-	inoremap <expr> <C-n> pumvisible() ? '<C-n>' :
-		\ '<C-n><C-r>=pumvisible() ? "\<lt>Down>" : ""<CR>'
-	inoremap <expr> <M-,> pumvisible() ? '<C-n>' :
-		\ '<C-x><C-o><C-n><C-p><C-r>=pumvisible() ? "\<lt>Down>" : ""<CR>'
-	" trigger omnicompletion using <C-m> (compared to <C-n> for plain completion)
-	inoremap <C-m> <C-x><C-o>
-
-	" close documentation buffer after selecting a completion item
-	autocmd CompleteDone * silent! pclose
-	" close quickfix buffer after selection
-	autocmd FileType qf nnoremap <buffer> <CR> <CR>:cclose<CR>
-endif
+let g:wordmotion_prefix = '<leader>'
+nmap <S-w> <leader>w
diff --git a/pkgs/custom-neovim/default.nix b/pkgs/custom-neovim/default.nix
index 1dff1f7..422847e 100644
--- a/pkgs/custom-neovim/default.nix
+++ b/pkgs/custom-neovim/default.nix
@@ -17,7 +17,7 @@ in pkgs.neovim.override {
       # autocomplete
         fzfWrapper
         fzf-vim
-        async vim-lsp
+        vim-gutentags
 
       # load project specific config
         vim-localvimrc
diff --git a/pkgs/custom-neovim/plugins.nix b/pkgs/custom-neovim/plugins.nix
index 5e0f6ea..9ff92f2 100644
--- a/pkgs/custom-neovim/plugins.nix
+++ b/pkgs/custom-neovim/plugins.nix
@@ -76,24 +76,6 @@ in {
     };
   };
 
-  vim-lsp = buildVimPlugin {
-    name = "vim-lsp";
-    src = fetchgit {
-      url    = "https://github.com/prabirshrestha/vim-lsp.git";
-      rev    = "0310241af11adc6c3a7ba93955bc27b15744c957";
-      sha256 = "0ccd6is75qlk8mg9wpwp1ypq68p7lgbq1c1jbpr6pwr59s53r4lx";
-    };
-  };
-
-  async = buildVimPlugin {
-    name = "async";
-    src = fetchgit {
-      url    = "https://github.com/prabirshrestha/async.vim.git";
-      rev    = "f3014550d7a799097e56b094104dd2cd66cf2612";
-      sha256 = "0zn25qwycynagrij5rsp1x7kbfz612gn7xda0hvm4y7qr3pal77p";
-    };
-  };
-
   vim-color-akr = buildVimPlugin {
     name = "vim-color-akr";
     src  = ./asset/vim-color-akr;