" Always show the signcolumn, otherwise it would shift the text each time
" diagnostics appear/become resolved.
if has("nvim-0.5.0") || has("patch-8.1.1564")
  " Recently vim can merge signcolumn and number column into one
  set signcolumn=number
else
  set signcolumn=yes
endif

" 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 <c-space> to trigger completion.
if has('nvim')
  inoremap <silent><expr> <c-space> coc#refresh()
else
  inoremap <silent><expr> <c-@> coc#refresh()
endif

" GoTo definition
nmap <silent> gd <Plug>(coc-definition)

" Use <C-l> for trigger snippet expand.
imap <C-l> <Plug>(coc-snippets-expand)

" Use F2 to rename a variable, e.g.
nmap <F2> <Plug>(coc-rename)

let g:coc_global_extensions = [
  \ 'coc-tsserver',
  \ 'coc-css',
  \ 'coc-go',
  \ 'coc-html',
  \ 'coc-prettier',
  \ 'coc-sh',
  \ 'coc-svelte',
  \ 'coc-pairs',
  \ 'coc-json',
  \ 'coc-snippets',
  \ 'coc-emmet',
  \ 'coc-highlight',
  \ 'coc-python',
  \ 'coc-emoji'
  \ ]

" Use <cr> to confirm completion, `<C-g>u` means break undo chain at current position.
" Coc only does snippet and additional edit on confirm.
inoremap <expr> <cr> pumvisible() ? "\<C-y>" : "\<C-g>u\<CR>"

command! -nargs=0 Prettier :CocCommand prettier.formatFile

" Use K to show documentation in preview window
nnoremap <silent> K :call <SID>show_documentation()<CR>

function! s:show_documentation()
  if (index(['vim','help'], &filetype) >= 0)
    execute 'h '.expand('<cword>')
  else
    call CocAction('doHover')
  endif
endfunction