rust-embed

rust macro which loads files into the rust binary at compile time during release and loads the file from the fs during dev.

1385925a — Mcat12

Show a help message if the folder was not found and includes a variable

Files changed (1) hide show

impl/src/lib.rs CHANGED Viewed

@@ -128,11 +128,20 @@ fn impl_rust_embed(ast: &syn::DeriveInput) -> Tokens {
   let folder_path = shellexpand::full(&folder_path).unwrap().to_string();
   if !Path::new(&folder_path).exists() {
-    panic!(
+    let mut message = format!(
       "#[derive(RustEmbed)] folder '{}' does not exist. cwd: '{}'",
       folder_path,
       std::env::current_dir().unwrap().to_str().unwrap()
     );
+    // Add a message about the interpolate-folder-path feature if the path may
+    // include a variable
+    if folder_path.contains("$") && cfg!(not(feature = "interpolate-folder-path")) {
+      message += "\nA variable has been detected. RustEmbed can expand variables \
+                  when the `interpolate-folder-path` feature is enabled.";
+    }
+    panic!(message);
   };
   generate_assets(&ast.ident, folder_path)