nukevim/lua/module/start.lua

local M = require('module'):new()

function M:boot()
	self.opts = {
		win = {
			number = false,
			list = false,
			colorcolumn = "",
			cursorline = false
		},
		buf = {
		}
	}
	self.is_gui = false
	self.is_visible = false
end

function M:run()
	if (vim.fn.argc() == 0 or vim.fn.line2byte("$") ~= -1) then -- and not vim.opt.insertmode) then
		self:show()
	end
end

function M:gui()
	local win = vim.api.nvim_get_current_win()
	local buf = vim.api.nvim_get_current_buf()

	self.is_gui = true
	self.opts.win.list = vim.api.nvim_win_get_option(win, 'list')

	if (self.is_visible) then
		vim.api.nvim_win_set_option(win, 'list', false)
		self:draw(buf)
	end
end

function M:show()
	local height = vim.api.nvim_get_option('lines') - 2
	local width = vim.api.nvim_get_option('columns')

	local lines = require('data/start')

	if (#lines > height) then
		return
	end

	for i=1,#lines do
		if (#lines[i] > width) then
			return
		end
	end

	self.is_visible = true
	local win = vim.api.nvim_get_current_win()
	local buf = vim.api.nvim_create_buf(true, true)

	self:draw(buf)

	vim.api.nvim_buf_set_option(buf, "modified", false)
	vim.api.nvim_buf_set_option(buf, "buflisted", false)
	vim.api.nvim_buf_set_option(buf, "bufhidden", "wipe")
	vim.api.nvim_buf_set_option(buf, "buftype", "nofile")
	vim.api.nvim_buf_set_option(buf, "swapfile", false)

	for k, v in pairs(self.opts.win) do
		old_val = vim.api.nvim_win_get_option(win, k)
		vim.api.nvim_win_set_option(win, k, v)
		self.opts.win[k] = old_val
	end
	for k, v in pairs(self.opts.buf) do
		old_val = vim.api.nvim_buf_get_option(buf, k)
		vim.api.nvim_buf_set_option(buf, k, v)
		self.opts.buf[k] = old_val
	end

	-- vim.api.nvim_win_set_option(win, "number", false)
	-- vim.api.nvim_win_set_option(win, "list", false)
	-- vim.api.nvim_win_set_option(win, "cursorline", false)
	-- vim.api.nvim_win_set_option(win, "colorcolumn", "")

	vim.api.nvim_set_current_buf(buf)

	vim.api.nvim_create_autocmd("InsertEnter,WinEnter", {
			pattern = "<buffer>",
			callback = function()
				vim.cmd("enew")
				self:hide()
			end
		})
	vim.api.nvim_create_autocmd("FileType", {
			pattern = "netrw",
			callback = function()
				self:hide()
			end
		})
end

function M:hide()
	if (not self.is_visible) then
		return
	end
	self.is_visible = false
	local buf = vim.api.nvim_get_current_buf()
	local win = vim.api.nvim_get_current_win()

	vim.api.nvim_buf_set_option(buf, "modifiable", true)
	vim.api.nvim_buf_set_option(buf, "buflisted", true)
	vim.api.nvim_buf_set_option(buf, "buflisted", true)

	-- vim.api.nvim_win_set_option(win, "number", nukevim.config.settings.settings.o.number or false)
	-- vim.api.nvim_win_set_option(win, "colorcolumn", nukevim.config.settings.settings.o.cc or nukevim.config.settings.settings.o.colorcolumn or "")
	-- vim.api.nvim_win_set_option(win, "cursorline", nukevim.config.settings.settings.o.cursorline or false)
	-- if (self.is_gui) then
	-- 	enable_list = nukevim.config.ui.gui.show_whitespace or nukevim.config.ui.tui.show_whitespace or false
	-- else
	-- 	enable_list = nukevim.config.ui.tui.show_whitespace or false
	-- end
	-- vim.api.nvim_win_set_option(win, "list", enable_list)

	for k, v in pairs(self.opts.win) do
		vim.api.nvim_win_set_option(win, k, v)
	end
	for k, v in pairs(self.opts.buf) do
		vim.api.nvim_buf_set_option(buf, k, v)
	end

end

function M:draw(buf)
	local height = vim.api.nvim_get_option('lines') - 2
	local width = vim.api.nvim_get_option('columns')

	local lines = require('data/start')

	for i=1,#lines do
		lines[i] = self:center(lines[i])
	end

	vim.api.nvim_buf_set_lines(buf, 0, -1, false, lines)
end

function M:center(string)
	width = vim.api.nvim_get_option('columns')
	string_length = #string
	padding_length = (width - string_length) / 2 - 1
	padding = ''
	for i=1,padding_length do
		padding = padding .. ' '
	end
	return padding .. string .. padding
end


return M