Implementing evil-commentary's gy map to comment and yank

[cherryman]

Was wondering if it's possible to implement this using mini.comment or even with the now built-in comment mapping. I'm unfortunately not familiar enough with vimscript to figure out how to cleanly do this.

I've implemented this in cherryman/vim-commentary-yank, but looking for a neovim specific solution.

[echasnovski]

Not exactly what you are looking for, but you can do anything inside config.hooks.pre. Here is an example of always yanking commented text.

I am not sure how to properly achieve similar with built-in commenting. In Visual mode it can be done with :xmap gy ygvgc (y - yank visual selection, gv - restore visual selection, gc - comment visual selection). Note that it needs remap = true to achieve this with Lua's vim.keymap.set().

[cherryman]

For anyone else who runs into this, if you're willing to rely on implementation details of the original PR, then this works:

_G.__commentyank = function(mode)
  if mode == nil then
    vim.o.operatorfunc = 'v:lua.__commentyank'
    return 'g@'
  end

  local mark_from, mark_to = "'[", "']"
  local lnum_from, col_from = vim.fn.line(mark_from), vim.fn.col(mark_from)
  local lnum_to, col_to = vim.fn.line(mark_to), vim.fn.col(mark_to)

  if (lnum_from > lnum_to) or (lnum_from == lnum_to and col_from > col_to) then
    return
  end

  local l = vim.api.nvim_buf_get_lines(0, lnum_from - 1, lnum_to, false)
  vim.fn.setreg(vim.v.register, l)

  -- WARN: Relying on implementation details of `gc`.
  require('vim._comment').toggle_lines(lnum_from, lnum_to, vim.api.nvim_win_get_cursor(0))

  return ''
end

Then it's enough to map gy to _G.__commentyank with expr = true.