add nerdtree, remove gutentags

vim/.vimrc

@@ -2,12 +2,16 @@
 " author:   Thomas Ruoff
 
 " Basics {{{
+set encoding=utf-8
 set hidden
+
 set ttyfast
 set lazyredraw
 set updatetime=300
 set synmaxcol=512
+
 set modeline
+
 set nobackup
 set noswapfile
 
@@ -20,6 +24,12 @@ set wildignore+=*.swp,*.bak,*.jpg,*.gif,*.png,*.git,
 set splitright
 set splitbelow
 
+" Always show the status line
+set laststatus=2
+set cmdheight=2
+
+set shortmess+=c
+
 " yank delete change and put operations go by default in `"+` register
 " so in the systems clipboard accessable by CTRL-V on all OS types
 if has('mac')
@@ -103,38 +113,58 @@ Plug 'tpope/vim-projectionist'
 Plug 'mbbill/undotree'
     nnoremap <leader>u :UndotreeToggle<cr>
 
-Plug 'w0rp/ale'
-    nmap <silent> [a <Plug>(ale_previous_wrap)
-    nmap <silent> <C-j> <Plug>(ale_next_wrap)
-    let g:ale_linters = {}
-    let g:ale_linters.javascript = ['eslint']
-    let g:ale_fixers = {}
-    let g:ale_fixers.javascript = ['eslint']
-    let g:ale_fix_on_save = 1
-
 Plug 'neoclide/coc.nvim', {'branch': 'release'}
     " Remap keys for gotos
     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 `[c` and `]c` to navigate diagnostics
+
+    " Use `[d` and `]d` to navigate diagnostics
     nmap <silent> [d <Plug>(coc-diagnostic-prev)
     nmap <silent> ]d <Plug>(coc-diagnostic-next)
     " Remap for rename current word
     nmap <leader>rn <Plug>(coc-rename)
     " Remap for do codeAction of current line
     nmap <leader>ac  <Plug>(coc-codeaction)
+    " 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)
     " Fix autofix problem of current line
     nmap <leader>qf  <Plug>(coc-fix-current)
+    " 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 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
+
+    " Formatting selected code.
+    xmap <leader>f  <Plug>(coc-format-selected)
+    nmap <leader>f  <Plug>(coc-format-selected)
 
 Plug 'itchyny/lightline.vim'
     if filereadable(expand("~/.vim/lightline.vim"))
         source ~/.vim/lightline.vim
-        augroup ale-statusline
-            autocmd!
-            autocmd User ALELint call lightline#update()
-        augroup END
     endif
 
     function! LightlineReload()
@@ -167,17 +197,18 @@ Plug 'janko-m/vim-test'
   let test#strategy = "vimterminal"
 
 " vim 8 plugins
-if v:version >= 800
-    Plug 'ludovicchabant/vim-gutentags'
-        let g:gutentags_cache_dir="~/.tags"
-        let g:gutentags_file_list_command = {
-            \ 'markers': {
-                \ '.git': 'git ls-files',
-                \ '.hg': 'hg files',
-                \ },
-            \ }
-endif
+" if v:version >= 800
+"     Plug 'ludovicchabant/vim-gutentags'
+"         let g:gutentags_cache_dir="~/.tags"
+"         let g:gutentags_file_list_command = {
+"             \ 'markers': {
+"                 \ '.git': 'git ls-files',
+"                 \ '.hg': 'hg files',
+"                 \ },
+"             \ }
+" endif
 
+Plug 'preservim/nerdtree'
 
 " debug
 Plug 'tweekmonster/startuptime.vim'