Cleanup | Format files

* fix some lint warnings
* remove some unneeded code

lua/core/hooks.lua

@@ -1,31 +1,23 @@
 local hooks, M = {}, {}
 
 local allowed_hooks = {
-   "install_plugins",
-   "setup_mappings",
-   "ready",
+   ["install_plugins"] = true,
+   ["setup_mappings"] = true,
+   ["ready"] = true,
 }
 
-local function has_value(tab, val)
-   for _, value in ipairs(tab) do
-      if value == val then
-         return true
-      end
-   end
-end
-
 M.add = function(name, fn)
-   if not (has_value(allowed_hooks, name)) then
+   if not allowed_hooks[name] then
       print("Custom lua uses unallowed hook " .. name)
    end
-   if hooks[name] == nil then
+   if not hooks[name] then
       hooks[name] = {}
    end
    table.insert(hooks[name], fn)
 end
 
 M.run = function(name, args)
-   if hooks[name] ~= nil then
+   if hooks[name] then
       for _, hook in pairs(hooks[name]) do
          hook(args)
       end