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+"{ Custom key mappings
+" Save key strokes (now we do not need to press shift to enter command mode).
+" Vim-sneak has also mapped `;`, so using the below mapping will break the map
+" used by vim-sneak
+nnoremap ; :
+xnoremap ; :
+
+" Quicker way to open command window
+nnoremap q; q:
+
+" Quicker <Esc> in insert mode
+inoremap jk <Esc>
+
+" Turn the word under cursor to upper case
+inoremap <c-u> <Esc>viwUea
+
+" Turn the current word into title case
+inoremap <c-t> <Esc>b~lea
+
+" Paste non-linewise text above or below current cursor,
+" see https://stackoverflow.com/a/1346777/6064933
+nnoremap <leader>p m`o<ESC>p``
+nnoremap <leader>P m`O<ESC>p``
+
+" Shortcut for faster save and quit
+nnoremap <silent> <leader>w :<C-U>update<CR>
+" Saves the file if modified and quit
+nnoremap <silent> <leader>q :<C-U>x<CR>
+" Quit all opened buffers
+nnoremap <silent> <leader>Q :<C-U>qa<CR>
+
+" Navigation in the location and quickfix list
+nnoremap <silent> [l :<C-U>lprevious<CR>zv
+nnoremap <silent> ]l :<C-U>lnext<CR>zv
+nnoremap <silent> [L :<C-U>lfirst<CR>zv
+nnoremap <silent> ]L :<C-U>llast<CR>zv
+nnoremap <silent> [q :<C-U>cprevious<CR>zv
+nnoremap <silent> ]q :<C-U>cnext<CR>zv
+nnoremap <silent> [Q :<C-U>cfirst<CR>zv
+nnoremap <silent> ]Q :<C-U>clast<CR>zv
+
+" Close location list or quickfix list if they are present,
+" see https://superuser.com/q/355325/736190
+nnoremap<silent> \x :<C-U>windo lclose <bar> cclose<CR>
+
+" Close a buffer and switching to another buffer, do not close the
+" window, see https://stackoverflow.com/q/4465095/6064933
+nnoremap <silent> \d :<C-U>bprevious <bar> bdelete #<CR>
+
+" Insert a blank line below or above current line (do not move the cursor),
+" see https://stackoverflow.com/a/16136133/6064933
+nnoremap <expr> oo printf('m`%so<ESC>``', v:count1)
+nnoremap <expr> OO printf('m`%sO<ESC>``', v:count1)
+
+" nnoremap oo @='m`o<c-v><Esc>``'<cr>
+" nnoremap OO @='m`O<c-v><Esc>``'<cr>
+
+" the following two mappings work, but if you change double quote to single, it
+" will not work
+" nnoremap oo @="m`o\<lt>Esc>``"<cr>
+" nnoremap oo @="m`o\e``"<cr>
+
+" Insert a space after current character
+nnoremap <Space><Space> a<Space><ESC>h
+
+" Yank from current cursor position to the end of the line (make it
+" consistent with the behavior of D, C)
+nnoremap Y y$
+
+" Move the cursor based on physical lines, not the actual lines.
+nnoremap <expr> j (v:count == 0 ? 'gj' : 'j')
+nnoremap <expr> k (v:count == 0 ? 'gk' : 'k')
+nnoremap ^ g^
+nnoremap 0 g0
+
+" Do not include white space characters when using $ in visual mode,
+" see https://vi.stackexchange.com/q/12607/15292
+xnoremap $ g_
+
+" Jump to matching pairs easily in normal mode
+nnoremap <Tab> %
+
+" Go to start or end of line easier
+nnoremap H ^
+xnoremap H ^
+nnoremap L g_
+xnoremap L g_
+
+" Fast window switching, inspiration from
+" https://stackoverflow.com/a/4373470/6064933
+nnoremap <M-left> <C-w>h
+nnoremap <M-right> <C-w>l
+nnoremap <M-down> <C-w>j
+nnoremap <M-up> <C-w>k
+
+" Continuous visual shifting (does not exit Visual mode), `gv` means
+" to reselect previous visual area, see https://superuser.com/q/310417/736190
+xnoremap < <gv
+xnoremap > >gv
+
+" When completion menu is shown, use <cr> to select an item and do not add an
+" annoying newline. Otherwise, <enter> is what it is. For more info , see
+" https://superuser.com/a/941082/736190 and
+" https://unix.stackexchange.com/q/162528/221410
+inoremap <expr> <cr> ((pumvisible())?("\<C-Y>"):("\<cr>"))
+" Use <esc> to close auto-completion menu
+inoremap <expr> <esc> ((pumvisible())?("\<C-e>"):("\<esc>"))
+
+" Tab-complete, see https://vi.stackexchange.com/q/19675/15292.
+inoremap <expr> <tab> pumvisible() ? "\<c-n>" : "\<tab>"
+inoremap <expr> <s-tab> pumvisible() ? "\<c-p>" : "\<s-tab>"
+
+" Edit and reload init.vim quickly
+nnoremap <silent> <leader>ev :<C-U>tabnew $MYVIMRC <bar> tcd %:h<cr>
+nnoremap <silent> <leader>sv :<C-U>silent update $MYVIMRC <bar> source $MYVIMRC <bar>
+      \ echomsg "Nvim config successfully reloaded!"<cr>
+
+" Reselect the text that has just been pasted, see also https://stackoverflow.com/a/4317090/6064933.
+nnoremap <expr> <leader>v printf('`[%s`]', getregtype()[0])
+
+" Search in selected region
+vnoremap / :<C-U>call feedkeys('/\%>'.(line("'<")-1).'l\%<'.(line("'>")+1)."l")<CR>
+
+" Find and replace (like Sublime Text 3)
+nnoremap <C-H> :%s/
+xnoremap <C-H> :s/
+
+" Change current working directory locally and print cwd after that,
+" see https://vim.fandom.com/wiki/Set_working_directory_to_the_current_file
+nnoremap <silent> <leader>cd :<C-U>lcd %:p:h<CR>:pwd<CR>
+
+" Use Esc to quit builtin terminal
+tnoremap <ESC>   <C-\><C-n>
+
+" Toggle spell checking (autosave does not play well with z=, so we disable it
+" when we are doing spell checking)
+nnoremap <silent> <F11> :<C-U>set spell! <bar> :AutoSaveToggle<cr>
+inoremap <silent> <F11> <C-O>:<C-U>set spell! <bar> :AutoSaveToggle<cr>
+
+" Decrease indent level in insert mode with shift+tab
+inoremap <S-Tab> <ESC><<i
+
+" Change text without putting it into the vim register,
+" see https://stackoverflow.com/q/54255/6064933
+nnoremap c "_c
+nnoremap C "_C
+nnoremap cc "_cc
+xnoremap c "_c
+
+" Remove trailing whitespace characters
+nnoremap <silent> <leader><Space> :<C-U>call utils#StripTrailingWhitespaces()<CR>
+
+" check the syntax group of current cursor position
+nnoremap <silent> <leader>st :<C-U>call utils#SynGroup()<CR>
+
+" Clear highlighting
+if maparg('<C-L>', 'n') ==# ''
+  nnoremap <silent> <C-L> :<C-U>nohlsearch<C-R>=has('diff')?'<Bar>diffupdate':''<CR><CR><C-L>
+endif
+
+" Copy entire buffer.
+nnoremap <silent> <leader>y :<C-U>%y<CR>
+
+" Toggle cursor column
+nnoremap <silent> <leader>cl :<C-U>call utils#ToggleCursorCol()<CR>
+
+" Move current line up and down
+nnoremap <silent> <A-k> <Cmd>call utils#SwitchLine(line('.'), 'up')<CR>
+nnoremap <silent> <A-j> <Cmd>call utils#SwitchLine(line('.'), 'down')<CR>
+
+" Move current visual-line selection up and down
+xnoremap <silent> <A-k> :<C-U>call utils#MoveSelection('up')<CR>
+xnoremap <silent> <A-j> :<C-U>call utils#MoveSelection('down')<CR>
+
+" Replace visual selection with text in register, but not contaminate the
+" register, see also https://stackoverflow.com/q/10723700/6064933.
+xnoremap p "_c<ESC>p
+
+nnoremap <silent> gb :<C-U>call <SID>GoToBuffer(v:count, 'forward')<CR>
+nnoremap <silent> gB :<C-U>call <SID>GoToBuffer(v:count, 'backward')<CR>
+
+function! s:GoToBuffer(count, direction) abort
+  if a:count == 0
+    if a:direction ==# 'forward'
+      bnext
+    elseif a:direction ==# 'backward'
+      bprevious
+    else
+      echoerr 'Bad argument ' a:direction
+    endif
+    return
+  endif
+  " Check the validity of buffer number.
+  if index(s:GetBufNums(), a:count) == -1
+    echohl WarningMsg | echomsg 'Invalid bufnr: ' a:count | echohl None
+    return
+  endif
+
+  " Do not use {count} for gB (it is less useful)
+  if a:direction ==# 'forward'
+    silent execute('buffer' . a:count)
+  endif
+endfunction
+
+function! s:GetBufNums() abort
+  return map(copy(getbufinfo({'buflisted':1})), 'v:val.bufnr')
+endfunction
+
+nnoremap <Left> <C-W>h
+nnoremap <Right> <C-W>l
+nnoremap <Up> <C-W>k
+nnoremap <Down> <C-W>j
+"}