Added Lua global variable example (#144)

* lua global variable example

* add check

* cleaned up comment

* fixed capitalization

* fix package name

* removed unnecessary parenthesis

Author: RobinsAviary

.github/workflows/check.yml

@@ -62,6 +62,8 @@ jobs:
           odin check thread/sync_mutex $FLAGS
           odin check thread/pool/basic $FLAGS
 
+          odin check lua/global_variables $FLAGS
+
           odin check math/noise/draw_texture $FLAGS
           odin check math/rand/markov $FLAGS
 

lua/global_variables/global_variables.odin

@@ -0,0 +1,33 @@
+package global_variables
+
+import lua "vendor:lua/5.4"
+import "core:fmt"
+
+// The code the Lua VM will run
+CODE :: "print(Answer)"
+
+main :: proc() {
+	// Create new Lua state
+	state := lua.L_newstate()
+
+	// Open the base libraries (print, etc...)
+	lua.open_base(state)
+
+	// Set a new global integer (a Lua 5.3+ feature!) called "Answer" to 42
+	// First push the integer to the stack, essentially a "postboard" to talk with the Lua VM
+	lua.pushinteger(state, 42)
+	// Pops the top value on the stack and creates a global with it's value
+	lua.setglobal(state, "Answer")
+
+	// Run code and check if it succeeded
+	if lua.L_dostring(state, CODE) != 0 {
+		// Get the error string from the top of the stack and print it
+		error := lua.tostring(state, -1)
+		fmt.println(error)
+		// Pop the error off of the stack
+		lua.pop(state, 1)
+	}
+
+	// Closes the Lua VM, deallocating all memory
+	lua.close(state)
+}