Move RnD sample programs to examples dir, rename test_data to example_data, add stubs for server and client

examples/02-TestLuaScript/main.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"doll/internal/log"
+	"os"
+
+	lua "github.com/yuin/gopher-lua"
+)
+
+func main() {
+	file := "example_data/02-test.lua"
+	log.Init("info", os.Stderr)
+
+	L := lua.NewState()
+	defer L.Close()
+
+	// Load the Lua script file.
+	log.Infof("Loading %s", file)
+
+	// We can execute script directly via L.DoFile("./example_data/02-test.lua") but in practice we'll get scripts as
+	// strings - snippets from templates - so, testing/checking how it works is not use for project.
+	luaCode, err := os.ReadFile(file)
+
+	if err != nil {
+		log.Errorf("Error reading Lua file %s: %s", file, err)
+
+		os.Exit(1)
+	}
+
+	if err := L.DoString(string(luaCode)); err != nil {
+		log.Errorf("Error evaluating Lua code: %s", err)
+
+		os.Exit(1)
+	}
+}
+
+/* vim: set ft=go noet ai ts=4 sw=4 sts=4: */