local au = vim.api.nvim_create_autocmd
local augroup = vim.api.nvim_create_augroup
local ag = augroup("default", {})
local ft = augroup("filetypes", {})

-- shortly highlight yanks
au("TextYankPost", {
  group = ag,
  pattern = "*",
  callback = function()
    vim.highlight.on_yank({ higroup = "IncSearch", timeout = 250, on_visual = true })
  end,
})

au("WinEnter", {
  group = ag,
  pattern = "*",
  callback = function()
    vim.opt_local.cursorline = true
  end,
})
au("WinLeave", {
  group = ag,
  pattern = "*",
  callback = function()
    vim.opt_local.cursorline = false
  end,
})

-- highlight extra whitespace
local hlstmt = [[highlight ExtraWhitespace ctermbg=red guibg=red]]
vim.cmd(hlstmt)
au("ColorScheme", {
  group = ag,
  pattern = "*",
  callback = function()
    vim.cmd(hlstmt)
  end,
})
vim.cmd([[match ExtraWhitespace /\s\+$\| \+\ze\t/]])

-- only show color col in insert mode
au("InsertEnter", {
  group = ag,
  pattern = "*",
  callback = function()
    vim.o.colorcolumn = "78"
  end,
})
au("InsertLeave", {
  group = ag,
  pattern = "*",
  callback = function()
    vim.o.colorcolumn = ""
  end,
})

-- resize splits upon window resize
au("VimResized", {
  group = ag,
  pattern = "*",
  callback = function()
    vim.cmd([[exe "normal! \<C-w>="]])
  end,
})

-- ms word doc reading
au("BufReadPre", {
  group = ft,
  pattern = "*.doc{x,}",
  callback = function()
    vim.opt_local.readonly = true
  end,
})
vim.cmd([[au BufReadPost *.doc %!antiword "%"]])
vim.cmd([[au BufReadPost *.docx %!docx2txt "%" -]])

-- remove whitespace at the end of line
au({ "BufWritePre" }, {
  group = ag,
  pattern = "*",
  command = [[%s/\s\+$//e]],
})