refactor: add thiserror/anyhow for asset error handling

Cargo.lock

@@ -11,6 +11,12 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "anyhow"
+version = "1.0.98"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e16d2d3311acee920a9eb8d33b8cbc1787ce4a264e85f964c2404b969bdcd487"
+
 [[package]]
 name = "autocfg"
 version = "1.5.0"
@@ -164,6 +170,7 @@ checksum = "b15813163c1d831bf4a13c3610c05c0d03b39feb07f7e09fa234dac9b15aaf39"
 name = "pacman"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
  "lazy_static",
  "libc",
  "once_cell",
@@ -171,6 +178,7 @@ dependencies = [
  "rand",
  "sdl2",
  "spin_sleep",
+ "thiserror 1.0.69",
  "tracing",
  "tracing-error",
  "tracing-subscriber",
@@ -188,7 +196,7 @@ dependencies = [
  "integer-sqrt",
  "num-traits",
  "rustc-hash",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -375,13 +383,33 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "thiserror"
+version = "1.0.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6aaf5339b578ea85b50e080feb250a3e8ae8cfcdff9a461c9ec2904bc923f52"
+dependencies = [
+ "thiserror-impl 1.0.69",
+]
+
 [[package]]
 name = "thiserror"
 version = "2.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "567b8a2dae586314f7be2a752ec7474332959c6460e02bde30d702a66d488708"
 dependencies = [
- "thiserror-impl",
+ "thiserror-impl 2.0.12",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4fee6c4efc90059e10f81e6d42c60a18f76588c3d74cb83a0b242a2b6c7504c1"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
 ]
 
 [[package]]

Cargo.toml

@@ -15,6 +15,8 @@ spin_sleep = "1.3.2"
 rand = "0.9.2"
 pathfinding = "4.14"
 once_cell = "1.21.3"
+thiserror = "1.0"
+anyhow = "1.0"
 
 [target.'cfg(target_os = "windows")'.dependencies.winapi]
 version = "0.3"

src/asset.rs

@@ -3,16 +3,16 @@
 
 use std::borrow::Cow;
 use std::io;
+use thiserror::Error;
 
-#[derive(Debug)]
+#[derive(Error, Debug)]
 pub enum AssetError {
-    Io(io::Error),
-}
-
-impl From<io::Error> for AssetError {
-    fn from(e: io::Error) -> Self {
-        AssetError::Io(e)
-    }
+    #[error("IO error: {0}")]
+    Io(#[from] io::Error),
+    #[error("Asset not found: {0}")]
+    NotFound(String),
+    #[error("Invalid asset format: {0}")]
+    InvalidFormat(String),
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
@@ -63,6 +63,9 @@ mod imp {
     use std::path::Path;
     pub fn get_asset_bytes(asset: Asset) -> Result<Cow<'static, [u8]>, AssetError> {
         let path = Path::new("assets").join(asset.path());
+        if !path.exists() {
+            return Err(AssetError::NotFound(asset.path().to_string()));
+        }
         let bytes = fs::read(&path)?;
         Ok(Cow::Owned(bytes))
     }