nvim-tree: proactively retrieve mappings

nvim-tree: proactively retrieve mappings.lua

vim.keymap.set("n", "gb", function()
  local api = require "nvim-tree.api"

  local scratch_bufnr = vim.api.nvim_create_buf(true, true)

  print("scratch_bufnr " .. scratch_bufnr)

  -- substitute with user's on_attach as needed
  api.config.mappings.default_on_attach(scratch_bufnr)

  local keymaps = vim.api.nvim_buf_get_keymap(scratch_bufnr, "")

  for i = 1, 4, 1 do
    print(vim.inspect(keymaps[i]))
  end

  vim.api.nvim_buf_delete(scratch_bufnr, {})
end, opts)

-- output
scratch_bufnr 2
{
  buffer = 2,
  callback = <function 1>,
  desc = "nvim-tree: Open Preview",
  expr = 0,
  lhs = "<Tab>",
  lhsraw = "\t",
  lnum = 0,
  mode = "n",
  noremap = 1,
  nowait = 1,
  script = 0,
  sid = -8,
  silent = 1
}
{
  buffer = 2,
  callback = <function 1>,
  desc = "nvim-tree: Open",
  expr = 0,
  lhs = "<CR>",
  lhsraw = "\r",
  lnum = 0,
  mode = "n",
  noremap = 1,
  nowait = 1,
  script = 0,
  sid = -8,
  silent = 1
}
{
  buffer = 2,
  callback = <function 1>,
  desc = "nvim-tree: Up",
  expr = 0,
  lhs = "-",
  lhsraw = "-",
  lnum = 0,
  mode = "n",
  noremap = 1,
  nowait = 1,
  script = 0,
  sid = -8,
  silent = 1
}
{
  buffer = 2,
  callback = <function 1>,
  desc = "nvim-tree: Run Command",
  expr = 0,
  lhs = ".",
  lhsraw = ".",
  lnum = 0,
  mode = "n",
  noremap = 1,
  nowait = 1,
  script = 0,
  sid = -8,
  silent = 1
}