improve code

.luacheckrc

@@ -0,0 +1,4 @@
+std = "min"
+cache = true
+include_files = {"lua"}
+globals = {"vim"}

lua/background_nvim.lua

@@ -1,40 +1,41 @@
-function check_which_theme()
+local M = {}
+local opts = {
+	ms = 60 * 1000, -- 60 seconds
+	hour = 17, -- 5pm
+}
+
+function M.check_which_theme()
 	local hour = os.date("*t").hour
-	if (hour > vim.g.BackgroundNvimHour - 1) then
+	print(os.date("*t").sec)
+	if (hour > opts.hour) then
 		vim.opt.background = 'dark'
 	else
 		vim.opt.background = 'light'
 	end
 end
 
-local M = {}
-
 function M.setup(options)
-	if (not(vim.g.BackgroundNvimMS)) then
-		vim.g.BackgroundNvimMS = 60000
-	end
-
-	if (not(vim.g.BackgroundNvimHour)) then
-		vim.g.BackgroundNvimHour = 17
-	end
-
 	if (options) then
 		if (options.ms) then
-			vim.g.BackgroundNvimMS = options.ms
+			opts = options.ms
 		end
 
 		if (options.hour) then
-			vim.g.BackgroundNvimHour = options.hour
+			opts = options.hour
 		end
 	end
 
-	check_which_theme();
-
+	M.check_which_theme();
+
+	if (vim.g.background_nvim_timer) then
+		vim.cmd("call timer_stop(" .. vim.g.background_nvim_timer .. ")")
+	end
+
 	vim.cmd([[
 			func! ThemeChecker(timer)
-				lua check_which_theme()
+				lua require('background_nvim').check_which_theme()
 			endfunc
-			let timer = timer_start(g:BackgroundNvimMS, 'ThemeChecker', {'repeat': -1})
+			let g:background_nvim_timer = timer_start(]] .. opts.ms .. [[, 'ThemeChecker', {'repeat': -1})
 	]])
 end