Create lua callback when tree closes and opens

[ahmedkhalf]

Currently, I have this:

  vim.cmd "au FileType NvimTree lua require('core.nvimtree').on_type()"
end
--
M.on_type = function()
  local buf = vim.fn.expand "<abuf>"
  vim.cmd("au BufWinEnter <buffer=" .. buf .. "> lua require('core.nvimtree').on_open()")
  vim.cmd("au WinClosed   <buffer=" .. buf .. "> lua require('core.nvimtree').on_close()")
end
--
M.on_open = function()
  if package.loaded["bufferline.state"] and lvim.builtin.nvimtree.side == "left" then
    require("bufferline.state").set_offset(lvim.builtin.nvimtree.width + 1, "")
  end
end
--
M.on_close = function()
  if package.loaded["bufferline.state"] then
    require("bufferline.state").set_offset(0)
  end
end

It works, but the other lunarvim devs are not willing to accept it because it features 3 autocmds #1351. It would be great if nvim-tree could provide a lua callback whenever the tree opens or closes.

[kyazdani42]

why not just overriding the open/close functions ? like :NvimTreeOpen | some_other_func

[ahmedkhalf]

This works for opening, but for closing, there are many methods of closing, one of them is by doing :q, so unfortunately for closing, we need a callback.

[kyazdani42]

not sure i can manage all the different methods for closing, it depends on how users use nvim. You could actually bind keymaps for your use case by hacking around the ex commands.

[alex-courtis]

See also #917

[alex-courtis]

Implemented. See :help nvim_tree_events_kind