[mini.trailspace] How to setup automatic trim on write IF there are any whitespaces?

[IceS2]

Hello folks!
I've been thinking about using this plugin but I'd love to be able to actually setup automatic trim on write with confirmation. This would only make sense if there were actually any trailing whitespaces/lines on the buffer.

I managed to set an autocmd but I couldn't figure out how to check if there were trailing whitespaces on the buffer. I'd guess I could do the same check myself but It'd be great if I could use anything in the module to check that instead of rewriting some of the logic.

vim.api.nvim_create_autocmd({ "BufWritePre" }, {
    callback = function()
        vim.fn.confirm("Trim Whitespaces? [Y/n]", "&y\n&n, 1)
        -- Conditional to check the option (Didn't do it since I was focusing on the trigger first
        -- if choice == 1then
       --    require("mini.trailspace").trim()
       --    require("mini.trailspace").trim_last_lines()

Thanks (=

[echasnovski]

Hi!

There is no way to check any of that with 'mini.trailspace'. You can write custom functions for that:

local has_trailspace = function(buf_id)
  buf_id = buf_id or vim.api.nvim_get_current_buf()

  local lines = vim.api.nvim_buf_get_lines(buf_id, 0, -1, true)
  for _, l in ipairs(lines) do
    if l:find('%s$') then return true end
  end
  return false
end

local has_trail_lines = function(buf_id)
  buf_id = buf_id or vim.api.nvim_get_current_buf()

  local n_lines = vim.api.nvim_buf_line_count(buf_id)
  local last_nonblank = vim.api.nvim_buf_call(buf_id, function() return vim.fn.prevnonblank(n_lines) end)
  return last_nonblank < n_lines
end

Now you can add something like if not (has_trailspace() or has_trail_lines()) then return end at the start of your callback.

[IceS2]

Thanks for the info (=