Check thumbnail

Fix #7

src/check/manifest.rs

@@ -80,6 +80,7 @@ pub async fn check(
  };
 
  dont_exclude_template_files(diags, &manifest, package_dir, exclude);
+ check_thumbnail(diags, &manifest, manifest_file_id, package_dir);
 
  Worlds {
  package: world,
@@ -482,3 +483,34 @@ fn dont_exclude_template_files(
 
  Some(())
 }
+
+fn check_thumbnail(
+ diags: &mut Diagnostics,
+ manifest: &toml_edit::ImDocument<&String>,
+ manifest_file_id: FileId,
+ package_dir: &Path,
+) -> Option<()> {
+ let thumbnail = manifest.get("template")?.as_table()?.get("thumbnail")?;
+ let thumbnail_path = package_dir.join(thumbnail.as_str()?);
+
+ if !thumbnail_path.exists() {
+ diags.emit(
+ Diagnostic::error()
+ .with_labels(vec![Label::primary(manifest_file_id, thumbnail.span()?)])
+ .with_message("This file does not exist."),
+ )
+ }
+
+ if !matches!(
+ thumbnail_path.extension().and_then(|e| e.to_str()),
+ Some("png" | "webp")
+ ) {
+ diags.emit(
+ Diagnostic::error()
+ .with_labels(vec![Label::primary(manifest_file_id, thumbnail.span()?)])
+ .with_message("Thumbnails should be PNG or WebP files."),
+ )
+ }
+
+ Some(())
+}