modules/neovim: Fix coc

home-manager/modules/neovim.nix

@@ -104,10 +104,68 @@
         set undoreload=1000
       endif
 
+      " COC
+
       " Having longer updatetime (default is 4000 ms = 4s) leads to noticeable
       " delays and poor user experience
       set updatetime=300
 
+      " Use tab for trigger completion with characters ahead and navigate
+      " NOTE: There's always complete item selected by default, you may want to enable
+      " no select by `"suggest.noselect": true` in your configuration file
+      " NOTE: Use command ':verbose imap <tab>' to make sure tab is not mapped by
+      " other plugin before putting this into your config
+      inoremap <silent><expr> <TAB>
+            \ coc#pum#visible() ? coc#pum#next(1) :
+            \ CheckBackspace() ? "\<Tab>" :
+            \ coc#refresh()
+      inoremap <expr><S-TAB> coc#pum#visible() ? coc#pum#prev(1) : "\<C-h>"
+
+      " Make <CR> to accept selected completion item or notify coc.nvim to format
+      " <C-g>u breaks current undo, please make your own choice
+      inoremap <silent><expr> <CR> coc#pum#visible() ? coc#pum#confirm()
+                                    \: "\<C-g>u\<CR>\<c-r>=coc#on_enter()\<CR>"
+
+      function! CheckBackspace() abort
+        let col = col('.') - 1
+        return !col || getline('.')[col - 1]  =~# '\s'
+      endfunction
+
+      " Use <c-space> to trigger completion
+      if has('nvim')
+        inoremap <silent><expr> <c-space> coc#refresh()
+      else
+        inoremap <silent><expr> <c-@> coc#refresh()
+      endif
+
+      " Use `[g` and `]g` to navigate diagnostics
+      " Use `:CocDiagnostics` to get all diagnostics of current buffer in location list
+      nmap <silent> [g <Plug>(coc-diagnostic-prev)
+      nmap <silent> ]g <Plug>(coc-diagnostic-next)
+
+      " GoTo code navigation
+      nmap <silent> gd <Plug>(coc-definition)
+      nmap <silent> gy <Plug>(coc-type-definition)
+      nmap <silent> gi <Plug>(coc-implementation)
+      nmap <silent> gr <Plug>(coc-references)
+
+      " Use K to show documentation in preview window
+      nnoremap <silent> K :call ShowDocumentation()<CR>
+
+      function! ShowDocumentation()
+        if CocAction('hasProvider', 'hover')
+          call CocActionAsync('doHover')
+        else
+          call feedkeys('K', 'in')
+        endif
+      endfunction
+
+      " Highlight the symbol and its references when holding the cursor
+      autocmd CursorHold * silent call CocActionAsync('highlight')
+
+      " Symbol renaming
+      nmap <leader>rn <Plug>(coc-rename)
+
       " Always show the signcolumn, otherwise it would shift the text each time
       " diagnostics appear/become resolved
       set signcolumn=yes