feat: restructure plugin system, add Lua plugin support, update docs

internal/plugin/lua_util.go

@@ -0,0 +1,60 @@
+package plugin
+
+import lua "github.com/yuin/gopher-lua"
+
+func luaValueToGo(lv lua.LValue) interface{} {
+	switch v := lv.(type) {
+	case lua.LString:
+		return string(v)
+	case lua.LNumber:
+		return float64(v)
+	case lua.LBool:
+		return bool(v)
+	case *lua.LTable:
+		if v.MaxN() > 0 {
+			arr := make([]interface{}, 0, v.MaxN())
+			v.ForEach(func(_, val lua.LValue) {
+				arr = append(arr, luaValueToGo(val))
+			})
+			return arr
+		}
+		m := make(map[string]interface{})
+		v.ForEach(func(key, val lua.LValue) {
+			m[key.String()] = luaValueToGo(val)
+		})
+		return m
+	default:
+		return nil
+	}
+}
+
+func goValueToLua(L *lua.LState, val interface{}) lua.LValue {
+	switch v := val.(type) {
+	case string:
+		return lua.LString(v)
+	case float64:
+		return lua.LNumber(v)
+	case int:
+		return lua.LNumber(v)
+	case int64:
+		return lua.LNumber(v)
+	case bool:
+		return lua.LBool(v)
+	case nil:
+		return lua.LNil
+	case []interface{}:
+		tbl := L.NewTable()
+		for i, item := range v {
+			tbl.RawSetInt(i+1, goValueToLua(L, item))
+		}
+		return tbl
+	case map[string]interface{}:
+		tbl := L.NewTable()
+		for k, item := range v {
+			tbl.RawSetString(k, goValueToLua(L, item))
+		}
+		return tbl
+	default:
+		return lua.LNil
+	}
+}