Add wezterm variables script

wezterm/variables.lua

@@ -0,0 +1,26 @@
+local variables = {}
+
+variables.callbacks = {}
+
+function variables.callbacks.bgcolor(window, _, color)
+	local overrides = window:get_config_overrides() or {}
+
+	if color ~= "" then
+		overrides.colors = { background = color }
+	else
+		overrides.colors = nil
+	end
+
+	window:set_config_overrides(overrides)
+end
+
+function variables.listen()
+	local wezterm = require "wezterm"
+	wezterm.on("user-var-changed", function(window,pane,name,value)
+		if variables.callbacks[name] then
+			return variables.callbacks[name](window, pane, value)
+		end
+	end)
+end
+
+return variables