init.vim

coc-settings.json

{
    "suggest.noselect": false,
    "diagnostic.errorSign": "✘",
    "diagnostic.warningSign": "!",
    "diagnostic.infoSign": "?",
    "diagnostic.checkCurrentLine": true,
    "coc.preferences.hoverTarget": "float",
    "coc.preferences.formatOnSaveFiletypes": [
        "javascript",
        "html",
        "json",
        "css",
        "scss",
        "go"
    ],
    "languageserver": {
        "golang": {
            "command": "gopls",
            "rootPatterns": [
                "go.mod"
            ],
            "filetypes": [
                "go"
            ]
        }
    },
    "go.goplsOptions": {
        "staticcheck": true
    }
}

init.vim

let mapleader = ";"
set nocompatible            " disable compatibility to old-time vi
set showmatch               " show matching 
set cmdheight=2
set ignorecase              " case insensitive 
set mouse=v                 " middle-click paste with 
set hlsearch                " highlight search 
set incsearch               " incremental search
set tabstop=4               " number of columns occupied by a tab 
set softtabstop=4           " see multiple spaces as tabstops so <BS> does the right thing
set expandtab
set shiftwidth=4            " width for autoindents
set autoindent              " indent a new line the same amount as the line just typed
set number                  " add line numbers
set wildmode=longest,list   " get bash-like tab completions
filetype plugin indent on   "allow auto-indenting depending on file type
syntax on                   " syntax highlighting
set mouse=a                 " enable mouse click
set clipboard=unnamedplus   " using system clipboard
filetype plugin on
set ttyfast                 " Speed up scrolling in Vim
set updatetime=400
" set spell                 " enable spell check (may need to download language package)
" set noswapfile            " disable creating swap file
" set backupdir=~/.cache/vim " Directory to store backup files.

call plug#begin('~/.vim/plugged')
    Plug 'preservim/nerdtree'
    Plug 'tpope/vim-fugitive'
    Plug 'ctrlpvim/ctrlp.vim'
    Plug 'fatih/vim-go', { 'do': ':GoUpdateBinaries' }
    Plug 'haishanh/night-owl.vim'
    Plug 'vim-airline/vim-airline'
    Plug 'neoclide/coc.nvim', {'branch': 'release'}
    Plug 'nvim-lua/plenary.nvim'
    Plug 'nvim-telescope/telescope.nvim'
    Plug 'nvim-telescope/telescope-fzy-native.nvim'
    Plug 'jiangmiao/auto-pairs'
    Plug 'preservim/tagbar'
call plug#end()

if (has("termguicolors"))
 set termguicolors
endif

colorscheme night-owl

" Go
au FileType go set noexpandtab
au FileType go set shiftwidth=4
au FileType go set softtabstop=4
au FileType go set tabstop=4
au FileType go nmap <leader>gt :GoDeclsDir<cr>
au Filetype go nmap <leader>ga <Plug>(go-alternate-edit)
au Filetype go nmap <leader>gah <Plug>(go-alternate-split)
au Filetype go nmap <leader>gav <Plug>(go-alternate-vertical)
au FileType go nmap <F12> <Plug>(go-def)

let g:go_highlight_build_constraints = 1
let g:go_highlight_extra_types = 1
let g:go_highlight_fields = 1
let g:go_highlight_functions = 1
let g:go_highlight_methods = 1
let g:go_highlight_operators = 1
let g:go_highlight_structs = 1
let g:go_highlight_types = 1
let g:go_auto_type_info = 1
let g:go_auto_sameids = 1
let g:go_fmt_command = "goimports"
let g:go_def_mode='gopls'
let g:go_info_mode='gopls'
autocmd BufWritePre *.go :call CocAction('runCommand', 'editor.action.organizeImport')

" ale
let g:ale_linters = {
  \ 'go': ['gopls'],
  \}
" Error and warning signs.
let g:ale_sign_error = '⤫'
let g:ale_sign_warning = '⚠'

" key bindings

noremap <leader>1 1gt
noremap <leader>2 2gt
noremap <leader>3 3gt
noremap <leader>4 4gt
noremap <leader>5 5gt
noremap <leader>6 6gt
noremap <leader>7 7gt
noremap <leader>8 8gt
noremap <leader>9 9gt
noremap <leader>0 :tablast<cr>
map <C-n> :NERDTreeToggle<CR>
nnoremap <leader>n :NERDTreeFocus<CR>

" windows
nnoremap <leader>w <C-w>
nmap <Tab> <C-W>w
nmap <S-Tab> <C-W>W

autocmd FileType go nmap <Leader>tc <Plug>(go-coverage-toggle)
autocmd FileType go nmap <leader>t  <Plug>(go-test)

autocmd BufEnter *.go nmap <leader>tt <Plug>(go-test-func)
autocmd BufEnter *.go nmap <leader>i  <Plug>(go-implements)
autocmd BufEnter *.go nmap <leader>ci  <Plug>(go-describe)
autocmd BufEnter *.go nmap <leader>cc  <Plug>(go-callers)
nmap <leader>cr <Plug>(coc-references)
nmap <leader>r <Plug>(coc-rename)

" Telescope
nnoremap <leader>ff <cmd>Telescope find_files<cr>
nnoremap <leader>fg <cmd>Telescope live_grep<cr>
nnoremap <leader>fb <cmd>Telescope buffers<cr>
nnoremap <leader>fh <cmd>Telescope help_tags<cr>

" CoC config

" TextEdit might fail if hidden is not set.
set hidden

" Some servers have issues with backup files, see #649.
set nobackup
set nowritebackup

" Don't pass messages to |ins-completion-menu|.
set shortmess+=c

" 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.
" 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>
      \ 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

" Make <CR> auto-select the first completion item and notify coc.nvim to
" format on enter, <cr> could be remapped by other vim plugin
inoremap <silent><expr> <cr> pumvisible() ? coc#_select_confirm()
                              \: "\<C-g>u\<CR>\<c-r>=coc#on_enter()\<CR>"

" 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 <SID>show_documentation()<CR>

function! s:show_documentation()
  if (index(['vim','help'], &filetype) >= 0)
    execute 'h '.expand('<cword>')
  elseif (coc#rpc#ready())
    call CocActionAsync('doHover')
  else
    execute '!' . &keywordprg . " " . expand('<cword>')
  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)

" Formatting selected code.
xmap <leader>f  <Plug>(coc-format-selected)
nmap <leader>f  <Plug>(coc-format-selected)

augroup mygroup
  autocmd!
  " Setup formatexpr specified filetype(s).
  autocmd FileType typescript,json setl formatexpr=CocAction('formatSelected')
  " Update signature help on jump placeholder.
  autocmd User CocJumpPlaceholder call CocActionAsync('showSignatureHelp')
augroup end

" Applying codeAction to the selected region.
" Example: `<leader>aap` for current paragraph
xmap <leader>a  <Plug>(coc-codeaction-selected)
nmap <leader>a  <Plug>(coc-codeaction-selected)

" Remap keys for applying codeAction to the current buffer.
nmap <leader>ac  <Plug>(coc-codeaction)
" Apply AutoFix to problem on the current line.
nmap <leader>qf  <Plug>(coc-fix-current)

" Map function and class text objects
" NOTE: Requires 'textDocument.documentSymbol' support from the language server.
xmap if <Plug>(coc-funcobj-i)
omap if <Plug>(coc-funcobj-i)
xmap af <Plug>(coc-funcobj-a)
omap af <Plug>(coc-funcobj-a)
xmap ic <Plug>(coc-classobj-i)
omap ic <Plug>(coc-classobj-i)
xmap ac <Plug>(coc-classobj-a)
omap ac <Plug>(coc-classobj-a)

" Remap <C-f> and <C-b> for scroll float windows/popups.
if has('nvim-0.4.0') || has('patch-8.2.0750')
  nnoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? coc#float#scroll(1) : "\<C-f>"
  nnoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? coc#float#scroll(0) : "\<C-b>"
  inoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? "\<c-r>=coc#float#scroll(1)\<cr>" : "\<Right>"
  inoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? "\<c-r>=coc#float#scroll(0)\<cr>" : "\<Left>"
  vnoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? coc#float#scroll(1) : "\<C-f>"
  vnoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? coc#float#scroll(0) : "\<C-b>"
endif

" Use CTRL-S for selections ranges.
" Requires 'textDocument/selectionRange' support of language server.
nmap <silent> <C-s> <Plug>(coc-range-select)
xmap <silent> <C-s> <Plug>(coc-range-select)

" Add `:Format` command to format current buffer.
command! -nargs=0 Format :call CocAction('format')

" Add `:Fold` command to fold current buffer.
command! -nargs=? Fold :call     CocAction('fold', <f-args>)

" Add `:OR` command for organize imports of the current buffer.
command! -nargs=0 OR   :call     CocAction('runCommand', 'editor.action.organizeImport')

" Add (Neo)Vim's native statusline support.
" NOTE: Please see `:h coc-status` for integrations with external plugins that
" provide custom statusline: lightline.vim, vim-airline.
set statusline^=%{coc#status()}%{get(b:,'coc_current_function','')}

" Mappings for CoCList
" Show all diagnostics.
nnoremap <silent><nowait> <space>a  :<C-u>CocList diagnostics<cr>
" Manage extensions.
nnoremap <silent><nowait> <space>e  :<C-u>CocList extensions<cr>
" Show commands.
nnoremap <silent><nowait> <space>c  :<C-u>CocList commands<cr>
" Find symbol of current document.
nnoremap <silent><nowait> <space>o  :<C-u>CocList outline<cr>
" Search workspace symbols.
nnoremap <silent><nowait> <space>s  :<C-u>CocList -I symbols<cr>
" Do default action for next item.
nnoremap <silent><nowait> <space>j  :<C-u>CocNext<CR>
" Do default action for previous item.
nnoremap <silent><nowait> <space>k  :<C-u>CocPrev<CR>
" Resume latest coc list.
nnoremap <silent><nowait> <space>p  :<C-u>CocListResume<CR>