traversing on empty tags does not cause an error anymore

init.lua

@@ -17,35 +17,80 @@ local keys = {
 	right = { "l" }
 }
 
+local function loadrequire(mod)
+	local function requiref(mdl)
+		require(mdl)
+	end
+	local res = pcall(requiref, mod)
+	return res
+end
+
 local function new(ks)
 	keys = ks or keys
 	local aw = {}
 
-	glib.idle_add(glib.PRIORITY_DEFAULT_IDLE, function()
-		for k, v in pairs(keys) do
-			for _, key_name in ipairs(v) do
-				aw[#aw + 1] = awful.key(
-					{ "Mod4" },
-					key_name,
-					function()
-						module.focus(k)
-					end,
-					{
-						description = "Change focus to the " .. key_name .. " window",
-						group = "Navigator"
-					}
-				)
+	local use_collision = loadrequire("collision")
+	if use_collision then
+		collision = require("collision"){} -- load collision without any keybinds
+	end
+
+	if use_collision then
+		glib.idle_add(glib.PRIORITY_DEFAULT_IDLE, function()
+			for k, v in pairs(keys) do
+				for _, key_name in ipairs(v) do
+					aw[#aw + 1] = awful.key(
+						{ "Mod4" },
+						key_name,
+						function()
+							module.focus(k)
+						end,
+						{
+							description = "Change focus to the " .. key_name .. " Window / Tmux Pane / VIM Split",
+							group = "Navigator"
+						}
+					)
+					aw[#aw + 1] = awful.key(
+						{ "Mod4", "Shift" },
+						key_name,
+						function()
+							collision.move(k)
+						end,
+						{
+							description = "Move to the " .. key_name,
+							group = "Collision"
+						}
+					)
+				end
 			end
-		end
-		capi.root.keys(awful.util.table.join(capi.root.keys(), unpack(aw)))
-	end)
+			capi.root.keys(awful.util.table.join(capi.root.keys(), unpack(aw)))
+		end)
+	else
+		glib.idle_add(glib.PRIORITY_DEFAULT_IDLE, function()
+			for k, v in pairs(keys) do
+				for _, key_name in ipairs(v) do
+					aw[#aw + 1] = awful.key(
+						{ "Mod4" },
+						key_name,
+						function()
+							module.focus(k)
+						end,
+						{
+							description = "Change focus to the " .. key_name .. " window",
+							group = "Navigator"
+						}
+					)
+				end
+			end
+			capi.root.keys(awful.util.table.join(capi.root.keys(), unpack(aw)))
+		end)
+	end
 	return module
 end
 
 function module.focus(dir)
 	local c = client.focus
 
-	local client_name = c.name or ""
+	local client_name = c and c.name or ""
 
 	if string.find(client_name, "- N?VIM$") then
 		keygrabber.stop()