Add descriptions to commands via `vim.api.nvim_create_user_command`

[mrjones2014]

Is your feature request related to a problem? Please describe.

Trying to build a good legendary.nvim extension for nvim-tree.lua

Describe the solution you'd like

You create the commands here:

nvim-tree.lua/lua/nvim-tree.lua

Lines 245 to 280 in aa99717

	local function setup_vim_commands()
	vim.api.nvim_create_user_command("NvimTreeOpen", function(res)
	require("nvim-tree.api").tree.open { path = res.args }
	end, { nargs = "?", complete = "dir" })
	vim.api.nvim_create_user_command("NvimTreeClose", function()
	require("nvim-tree.api").tree.close()
	end, { bar = true })
	vim.api.nvim_create_user_command("NvimTreeToggle", function(res)
	require("nvim-tree.api").tree.toggle { find_file = false, focus = true, path = res.args, update_root = false }
	end, { nargs = "?", complete = "dir" })
	vim.api.nvim_create_user_command("NvimTreeFocus", function()
	require("nvim-tree.api").tree.focus()
	end, { bar = true })
	vim.api.nvim_create_user_command("NvimTreeRefresh", function()
	require("nvim-tree.api").tree.reload()
	end, { bar = true })
	vim.api.nvim_create_user_command("NvimTreeClipboard", function()
	require("nvim-tree.api").fs.print_clipboard()
	end, { bar = true })
	vim.api.nvim_create_user_command("NvimTreeFindFile", function(res)
	require("nvim-tree.api").tree.find_file { open = true, update_root = res.bang }
	end, { bang = true, bar = true })
	vim.api.nvim_create_user_command("NvimTreeFindFileToggle", function(res)
	require("nvim-tree.api").tree.toggle { find_file = true, focus = true, path = res.args, update_root = res.bang }
	end, { bang = true, nargs = "?", complete = "dir" })
	vim.api.nvim_create_user_command("NvimTreeResize", function(res)
	M.resize(res.args)
	end, { nargs = 1, bar = true })
	vim.api.nvim_create_user_command("NvimTreeCollapse", function()
	require("nvim-tree.api").tree.collapse_all(false)
	end, { bar = true })
	vim.api.nvim_create_user_command("NvimTreeCollapseKeepBuffers", function()
	require("nvim-tree.api").tree.collapse_all(true)
	end, { bar = true })
	vim.api.nvim_create_user_command("NvimTreeGenerateOnAttach", keymap_legacy.cmd_generate_on_attach, {})
	end

The vim.api.nvim_create_user_command function accepts a desc field to provide a description that will be shown if you look up the commands via the Neovim API.

Describe alternatives you've considered

Hard-coding the descriptions.

Additional context

mrjones2014/legendary.nvim#320

[alex-courtis]

That's a great idea; thanks for letting me know that we can do this.