-- Navigate qflist with <C-j> and <C-k>.
vim.keymap.set("n", "<C-j>", "<Cmd>cnext<CR>zz")
vim.keymap.set("n", "<C-k>", "<Cmd>cprev<CR>zz")

-- Add all diagnostics to the qflist with grq.
vim.keymap.set("n", "grq", function()
  vim.diagnostic.setqflist({ open = false })
  pcall(vim.cmd.cc)
end)

-- Toggle the qflist window with <Leader>q.
vim.keymap.set("n", "<Leader>q", function()
  vim.cmd(vim.fn.getqflist({ winid = 0 }).winid ~= 0 and "cclose" or "copen")
end)

-- Add all completion alternatives on the command line to the qflist. Mostly
-- used with `:find`. For example, do `:find something`, hit tab to show
-- possible completions, then <C-q> to add them all to the qflist.
vim.keymap.set("c", "<C-q>", function()
  vim.fn.setqflist(vim.tbl_map(function(match)
    return { filename = match, text = match }
  end, vim.fn.getcompletion(vim.fn.getcmdline(), "cmdline")))
  vim.api.nvim_input("<Esc>")
  vim.schedule(function()
    pcall(vim.cmd.cc)
  end)
end)

-- Show the current error in the command line after `:make`.
vim.api.nvim_create_autocmd("QuickFixCmdPost", {
  pattern = "make",
  callback = function()
    vim.schedule(function()
      pcall(vim.cmd.cc)
    end)
  end,
})

-- In the qflist window, disable numbers, enable cursorline and increase window
-- height a bit.
vim.api.nvim_create_autocmd("FileType", {
  pattern = "qf",
  callback = function()
    vim.wo.number = false
    vim.wo.cursorline = true
    vim.cmd.resize(20)
  end,
})