how can i get the width or winnr from neo-tree , and status if it is showing or not

[fzhnf]

how can i replicate these two nvim-tree call in neo-tree:

1. vim.api.nvim_win_get_width(require('nvim-tree.view').get_winnr()) - 1
2. require('nvim-tree.view').is_visible

i trying to migrate my tabline from bufferline.nvim to lualine built-in tabline, I'm missing one feature that i very liked which is the sidebar offset feature.

the offset feature is creating a space with the width size same as the neo-tree window if it shown, like the image below, the image is from the issue which i provide on next paragraph

i have tried to find solution on disccussions & issues page from both neo-tree and lualine repo, the closest answer i get to this problem is from ehlxr comment in the lualine discussion, it provide a configuration for lualine to create a space with the nvim-tree width and will shown together with nvim-tree , the next item will be shifted to the right at just the same length as nvim-tree window.

lualine config

      tabline = {

        lualine_a = {
          function()
            local len = vim.api.nvim_win_get_width(require('nvim-tree.view').get_winnr()) - 1 -- <-- this
            local title = 'Nvim-Tree'
            local left = (len - #title) / 2
            local right = len - left - #title

            return string.rep(' ', left) .. title .. string.rep(' ', right)
          end,
          cond = require('nvim-tree.view').is_visible, -- <-- and this
          color = 'Normal',
        },
        lualine_b = { { 'buffers', mode = 4 } },
        lualine_z = { 'tabs' },
      },

from the code it requested the width of nvim-tree using vim.api.nvim_win_get_width(require('nvim-tree.view').get_winnr()) - 1
and the status if nvim-tree is showing with require('nvim-tree.view').is_visible

i hoped if can get the same those feature works with neo-tree i can get my lualine's tabline behave just like bufferline offset sidebar feature for neo-tree🎉.

[fzhnf]

the closest i tried so far is this, but definitely not working

lazy.nvim config

return {
    'nvim-lualine/lualine.nvim',
    event = 'BufRead',
    dependencies = { 'DaikyXendo/nvim-material-icon', 'nvim-neo-tree/neo-tree.nvim' },
    opts = {
      tabline = {
        lualine_a = {
          {
            function()
              -- return string.rep(' ', vim.api.nvim_win_get_width(require('nvim-tree.view').get_winnr()) - 1)
              return string.rep(' ', vim.api.nvim_win_get_width(require('neo-tree.sources.common.preview').winid) - 1)
            end,
            -- cond = require('nvim-tree.view').is_visible,
            conf = require('neo-tree.sources.common.preview').is_active(),
            color = 'NvimTreeNormal',
          },
        },
        lualine_b = { { 'buffers', mode = 2 } },
      },
    },
  }