init.vim & CocConfig

CocConfig

{
  "suggest.enablePreview": true,
  "coc.preferences.hoverTarget": "float",
  "coc.preferences.diagnostic.displayByAle": true,
  "languageserver": {
    "elmLS": {
      "command": "elm-language-server",
      "args": ["--stdio"],
      "filetypes": ["elm"],
      "rootPatterns": ["elm.json"],
      "initializationOptions": {
        "runtime": "node",
        "elmPath": "elm",
        "elmFormatPath": "elm-format",
        "elmTestPath": "elm-test"
      }
    }
  }
}

init.vim

all plug#begin()
Plug 'elmcast/elm-vim', { 'for': 'elm' }
Plug 'neoclide/coc.nvim', {'do': './install.sh nightly'}
Plug 'w0rp/ale'
call plug#end()

" elm-vim
let g:elm_format_autosave = 0
let g:elm_setup_keybinding = 0
let g:elm_jump_to_error = 0
" ale
let g:ale_fix_on_save = 1
let g:ale_set_quickfix = 1
let g:ale_sign_error = '🔥'
let g:ale_sign_warning = '⚡️'
let g:ale_echo_msg_error_str = '🔥'
let g:ale_echo_msg_warning_str = '⚡️'
let g:ale_echo_msg_format = '[%linter%] %s [%severity%]'
let g:ale_disable_lsp = 1
let g:ale_fixers = {
\   'elm': ['elm-format'],
\}
let g:ale_elm_format_executable = 'elm-format'
let g:ale_elm_format_options = '--yes --elm-version=0.19'
" coc.nvim
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)
nmap <silent> gt <Plug>(coc-rename)
nnoremap <silent> gk :call <SID>show_documentation()<CR>
function! s:show_documentation()
  if &filetype ==# 'vim'
    execute 'h '.expand('<cword>')
  else
    if coc#util#has_float()
      pc
    else
      call CocActionAsync('doHover')
    endif
  endif
endfunction

" use <tab> for trigger completion and navigate to the next complete item
function! s:check_back_space() abort
  let col = col('.') - 1
  return !col || getline('.')[col - 1]  =~ '\s'
endfunction

inoremap <silent><expr> <Tab>
      \ pumvisible() ? "\<C-n>" :
      \ <SID>check_back_space() ? "\<Tab>" :
      \ coc#refresh()