made the lua app preload libraries and indicate how much time was spent loading them

the lua shell (or lua app) before this update was loading all the system
libraries for every command, which makes them slower to actually start
running (about 1.5s of delay). in this update, lua starts loading all
the libraries when the shell starts.

halyde/apps/lua.lua

@@ -1,23 +1,27 @@
-print("\27[44m".._VERSION.."\27[0m shell")
-print('Type "exit" to exit.')
 -- terminal.readHistory["lua"] = {""}
 local fs = require("filesystem")
+local computer = require("computer")
 
-local loadedLibraries = ""
+local bootTime = computer.uptime()
 local libList = fs.list("/lib/")
 for _, lib in pairs(libList) do
   if lib:match("(.+)%.lua") then
-    loadedLibraries = loadedLibraries .. "local " .. lib:match("(.+)%.lua") .. ' = require("' .. lib:match("(.+)%.lua") .. '")\n'
+    local name = lib:match("(.+)%.lua")
+    _G[name] = require(name)
   end
 end
 
+print(string.format("\27[37mLoaded %d libraries in %.2f seconds\27[0m",#libList,computer.uptime()-bootTime))
+print(string.format("\27[44m%s\27[0m shell",_VERSION))
+print('Type "exit" to exit.')
+
 while true do
   local command = terminal.read("lua", "\27[44mlua>\27[0m ")
   if command == "exit" then
     return
   elseif command~="" then
     local function runCommand()
-      local func = load(loadedLibraries.."return "..command,"=stdin") or load(loadedLibraries..command,"=stdin")
+      local func = load("return "..command,"=stdin") or load(command,"=stdin")
       local res = {assert(func)()}
       if res and (type(res[1])~="nil" or type(res[2])~="nil") then print(table.unpack(res)) end
     end