How to replicate HopChar2 in mini.jump2d?

[justEstif]

Hello,

I have been using the builtin jump2d opts, but I have found writing my own spotter challenging.
If you don't mind, could you assist me in writing it?

• I had tried to copy parts of the code for builtin opts, but I don't know how to limit the user input to two characters.

I have also found the builtin jump by query option to be great, but it is case-sensitive. Is there a way to make it case-insensitive?

Thanks for the awesome plugin!

[echasnovski]

Hi!

I had tried to copy parts of the code for builtin opts, but I don't know how to limit the user input to two characters.

My first suggestion is to look in direction of MiniJump2d.builtin_opts.single_character (more specifically, this helper) and ask user twice for an input character. Use vim.fn.getcharstr instead of input_fun (or copy code for H.getcharstr().

I have also found the builtin jump by query option to be great, but it is case-sensitive. Is there a way to make it case-insensitive?

It should be possible, although a bit hacky. Again, take a look at [this helper](this helper). Use vim.fn.input instead of input_fun and modify its output to model case insensitivity with Lua pattern. Like if output is ab then "case-insensitive" pattern should be [aA][bB]. Use Lua's string.upper() and string.lower() to achieve it programmatically.

I am not sure when I'd be able to write a full perfectly working example of HopChar2 for you, sorry.

[justEstif]

Thanks for the input. I will try do do what you suggested and post the result here.

[echasnovski]

Ok, I've got time sooner than I thought.

Try this snippet:

local safe_getcharstr = function(msg)
  vim.cmd('echon ' .. vim.inspect(msg))

  -- Allow `<C-c>` to end input
  local ok, res = pcall(vim.fn.getcharstr)

  -- Clean command line
  vim.cmd([[echo '' | redraw]])

  -- Treat `<Esc>` or `<CR>` as cancel
  if not ok or (res == '\27' or res == '\r') then return nil end

  return res
end

local make_ignorecase_pattern = function(word)
  local parts = {}
  for i = 1, word:len() do
    local char = word:sub(i, i)

    if char:find('^%a$') then
      -- Convert letter to a match both lower and upper case
      char = '[' .. char:lower() .. char:upper() .. ']'
    else
      -- Escape non-letter characters
      char = vim.pesc(char)
    end

    table.insert(parts, char)
  end

  return table.concat(parts)
end

local dummy_spotter = function() return {} end

require('mini.jump2d').setup({
  spotter = dummy_spotter,
  allowed_lines = { blank = false, fold = false },
  hooks = {
    before_start = function()
      local first = safe_getcharstr("(mini.jump2d) Enter first character: ")
      if first == nil then
        MiniJump2d.config.spotter = dummy_spotter
        return
      end

      local second = safe_getcharstr("(mini.jump2d) Enter second character: ")
      if second == nil then
        MiniJump2d.config.spotter = dummy_spotter
        return
      end

      local pattern = make_ignorecase_pattern(first .. second)
      MiniJump2d.config.spotter = MiniJump2d.gen_pattern_spotter(pattern)
    end,
  },
})

[justEstif]

That worked, thanks a lot.