refactor(engine): make asset importers per asset type

1 files changed, 10 insertions, 11 deletions

diff --git a/engine/src/material/asset.rs b/engine/src/material/asset.rs
index f87b768..f452f54 100644
--- a/engine/src/material/asset.rs
+++ b/engine/src/material/asset.rs
@@ -1,17 +1,9 @@
-use std::borrow::Cow;
-use std::collections::HashMap;
 use std::fs::read_to_string;
 use std::path::{Path, PathBuf};
 
-use crate::asset::{Assets, Handle as AssetHandle, Submitter as AssetSubmitter};
+use crate::asset::{Assets, Submitter as AssetSubmitter};
 use crate::material::Material;
 
-#[derive(Debug, Clone)]
-pub struct Map
-{
-    pub assets: HashMap<Cow<'static, str>, AssetHandle<Material>>,
-}
-
 /// Material asset import settings.
 #[derive(Debug)]
 #[non_exhaustive]
@@ -19,15 +11,19 @@ pub struct Settings {}
 
 pub fn add_importers(assets: &mut Assets)
 {
-    assets.set_importer(["mtl"], import_wavefront_mtl_asset);
+    assets.set_importer::<Material, Settings, Error>(import);
 }
 
-fn import_wavefront_mtl_asset(
+fn import(
     asset_submitter: &mut AssetSubmitter<'_>,
     path: &Path,
     _settings: Option<&'_ Settings>,
 ) -> Result<(), Error>
 {
+    if path.extension().is_none_or(|ext| ext != "mtl") {
+        return Err(Error::UnsupportedFileType);
+    }
+
     let parent_path = path
         .parent()
         .ok_or_else(|| Error::InvalidPath(path.to_path_buf()))?;
@@ -71,6 +67,9 @@ fn import_wavefront_mtl_asset(
 #[derive(Debug, thiserror::Error)]
 enum Error
 {
+    #[error("File type is unsupported")]
+    UnsupportedFileType,
+
     #[error("Invalid path '{}'", .0.display())]
     InvalidPath(PathBuf),