local map = function(key)
  -- get the extra options
  local opts = {noremap = true}
  for i, v in pairs(key) do
    if type(i) == 'string' then opts[i] = v end
  end

  -- basic support for buffer-scoped keybindings
  local buffer = opts.buffer
  opts.buffer = nil

  if buffer then
    vim.api.nvim_buf_set_keymap(0, key[1], key[2], key[3], opts)
  else
    vim.api.nvim_set_keymap(key[1], key[2], key[3], opts)
  end
end

-- search for visual selection
map {'v', '//', 'y/<C-R>"<CR>'}
map {'n', 'H', '^'}

-- ex command 
map {'c', '<C-p>', '<Up>'}
map {'c', '<C-n>', '<Down>'}

-- auto expand brackets
map {'i', '(;', '(<CR>)<C-c>O'}
map {'i', '(,', '(<CR>),<C-c>O'}
map {'i', '{;', '{<CR>}<C-c>O'}
map {'i', '{,', '{<CR>},<C-c>O'}
map {'i', '[;', '[<CR>]<C-c>O'}
map {'i', '[,', '[<CR>],<C-c>O'}

-- toggle hybrid mode
map {'n', '<leader>h', ':set rnu!<CR>'}

-- nvim-tree.lua
map {'n', '<leader>e', ':NvimTreeToggle<CR>'}

-- Telescope
map {'n', '<C-y>', '<cmd>Telescope buffers<CR>'}
map {'n', '<leader>f', '<cmd>Telescope find_files<CR>'}
map {'n', '<leader>l', '<cmd>Telescope live_grep<CR>'}
map {'n', '<silent> gy', '<cmd>Telescope treesitter<CR>'}

-- neo formatter
map {'n', '<leader>p', ':Neoformat<CR>'}

-- goyo mapping
map {'n', '<silent> <leader>w', ':Goyo<CR>'}

-- spelling
map {'n', '<silent> <leader>se', ':set spell spelllang=en<CR>'}
map {'n', '<silent> <leader>sd', ':set spell spelllang=de<CR>'}