crates/dtmm/src/engine.rs

@@ -156,15 +156,31 @@ fn build_mod_data_lua(state: Arc<State>) -> String {
         lua.push_str(mod_info.get_id());
 
         lua.push_str("\",\n        run = function()\n");
-        lua.push_str("            return new_mod(\"");
-        lua.push_str(mod_info.get_name());
+
+        let resources = mod_info.get_resources();
+        if resources.get_data().is_some() || resources.get_localization().is_some() {
+            lua.push_str("            new_mod(\"");
+            lua.push_str(mod_info.get_id());
             lua.push_str("\", {\n                init = \"");
-        lua.push_str(mod_info.get_resources().get_init());
+            lua.push_str(resources.get_init());
+
+            if let Some(data) = resources.get_data() {
                 lua.push_str("\",\n                data = \"");
-        lua.push_str(mod_info.get_resources().get_data());
+                lua.push_str(data);
+            }
+
+            if let Some(localization) = resources.get_localization() {
                 lua.push_str("\",\n                localization = \"");
-        lua.push_str(mod_info.get_resources().get_localization());
+                lua.push_str(localization);
+            }
+
             lua.push_str("\",\n            })\n");
+        } else {
+            lua.push_str("            return dofile(\"");
+            lua.push_str(resources.get_init());
+            lua.push_str("\")");
+        }
+
         lua.push_str("        end,\n        packages = [\n");
 
         for pkg_info in mod_info.get_packages() {

crates/dtmm/src/state.rs

@@ -62,8 +62,8 @@ impl PackageInfo {
 #[derive(Clone, Data, Debug)]
 pub(crate) struct ModResourceInfo {
     init: String,
-    data: String,
-    localization: String,
+    data: Option<String>,
+    localization: Option<String>,
 }
 
 impl ModResourceInfo {
@@ -71,12 +71,12 @@ impl ModResourceInfo {
         &self.init
     }
 
-    pub(crate) fn get_data(&self) -> &String {
-        &self.data
+    pub(crate) fn get_data(&self) -> Option<&String> {
+        self.data.as_ref()
     }
 
-    pub(crate) fn get_localization(&self) -> &String {
-        &self.localization
+    pub(crate) fn get_localization(&self) -> Option<&String> {
+        self.localization.as_ref()
     }
 }
 

crates/dtmt/src/cmd/build.rs

@@ -72,9 +72,12 @@ async fn find_project_config(dir: Option<PathBuf>) -> Result<ModConfig> {
     };
 
     let mut buf = String::new();
-    file.read_to_string(&mut buf).await?;
+    file.read_to_string(&mut buf)
+        .await
+        .wrap_err("invalid UTF-8")?;
 
-    let mut cfg: ModConfig = serde_sjson::from_str(&buf)?;
+    let mut cfg: ModConfig =
+        serde_sjson::from_str(&buf).wrap_err("failed to deserialize mod config")?;
     cfg.dir = path;
     Ok(cfg)
 }

lib/sdk/src/lib.rs

@@ -13,8 +13,10 @@ pub use context::Context;
 #[derive(Clone, Debug, Default, serde::Deserialize)]
 pub struct ModConfigResources {
     pub init: String,
-    pub data: String,
-    pub localization: String,
+    #[serde(default)]
+    pub data: Option<String>,
+    #[serde(default)]
+    pub localization: Option<String>,
 }
 
 #[derive(Clone, Debug, Default, serde::Deserialize)]