Improve coc.nvim

nvim/.config/nvim/coc-settings.json

@@ -1,9 +1,12 @@
 {
   "languageserver": {
     "golang": {
-      "command": "gopls",
+      "command": "/home/bca/.go/bin/gopls",
       "rootPatterns": ["go.mod", ".vim/", ".git/", ".hg/"],
-      "filetypes": ["go"]
+      "filetypes": ["go"],
+      "initializationOptions": {
+        "usePlaceholders": true
+       }
     },
     "bash": {
       "command": "bash-language-server",

vim/.vimrc

@@ -219,6 +219,7 @@ nmap <space>lc :lclose<CR>
 
 autocmd BufNewFile,BufRead *.tmpl set syntax=gohtmltmpl 
 
+" Coc mappings
 nmap <silent> gd <Plug>(coc-definition)
 nmap <silent> gy <Plug>(coc-type-definition)
 nmap <silent> gi <Plug>(coc-implementation)
@@ -227,8 +228,6 @@ nmap <silent> go :CocList outline<CR>
 
 nnoremap <silent> K :call <SID>show_documentation()<CR>
 nmap <leader>rn <Plug>(coc-rename)
-"inoremap <silent><expr> <TAB> pumvisible() ? "\<C-n>" : "\<TAB>"
-"inoremap <expr> <cr> pumvisible() ? "\<C-y>" : "\<CR>"
 
 function! s:show_documentation()
   if (index(['vim','help'], &filetype) >= 0)
@@ -238,6 +237,28 @@ function! s:show_documentation()
   endif
 endfunction
 
+" Use tab for trigger completion with characters ahead and navigate.
+inoremap <silent><expr> <TAB>
+      \ pumvisible() ? "\<C-n>" :
+      \ <SID>check_back_space() ? "\<TAB>" :
+      \ coc#refresh()
+inoremap <expr><S-TAB> pumvisible() ? "\<C-p>" : "\<C-h>"
+
+function! s:check_back_space() abort
+  let col = col('.') - 1
+  return !col || getline('.')[col - 1]  =~# '\s'
+endfunction
+
+" Use <cr> to confirm completion, `<C-g>u` means break undo chain at current
+" position. Coc only does snippet and additional edit on confirm.
+if has('patch8.1.1068')
+  " Use `complete_info` if your (Neo)Vim version supports it.
+  inoremap <expr> <cr> complete_info()["selected"] != "-1" ? "\<C-y>" : "\<C-g>u\<CR>"
+else
+  imap <expr> <cr> pumvisible() ? "\<C-y>" : "\<C-g>u\<CR>"
+endif
+
+
 nmap <C-p> :Clap files<CR>
 nmap <C-p>b :Clap buffers<CR>
 nmap <C-p>r :Clap grep<CR>