Don't suggest excluding template files

src/check/files.rs

@@ -60,7 +60,7 @@ pub fn check(
         warn_ignored_files(diags, file_path, excluded, ignored);
         forbid_font_files(diags, file_path);
         exclude_large_files(diags, file_path, excluded, metadata.len());
-        exclude_examples_and_tests(diags, file_path, excluded);
+        exclude_examples_and_tests(diags, manifest, file_path, excluded);
         link_manuals(diags, readme, file_path, excluded);
     }
 }
@@ -167,8 +167,19 @@ fn exclude_large_files(
     )
 }
 
-fn exclude_examples_and_tests(diags: &mut Diagnostics, path: PackagePath<&Path>, excluded: bool) {
-    if excluded {
+fn exclude_examples_and_tests(
+    diags: &mut Diagnostics,
+    manifest: &Manifest,
+    path: PackagePath<&Path>,
+    excluded: bool,
+) {
+    // Don't exclude template files, even if they contain "example" or "test" in their name.
+    let in_template_dir = || {
+        manifest
+            .template_path()
+            .is_some_and(|dir| path.full().starts_with(dir.full()))
+    };
+    if excluded || in_template_dir() {
         return;
     }
 

src/check/manifest.rs

@@ -32,6 +32,12 @@ pub struct Manifest {
     pub template: Option<Spanned<Template>>,
 }
 
+impl Manifest {
+    pub fn template_path(&self) -> Option<&PackagePath> {
+        Some(&self.template.as_ref()?.path.as_ref()?.val)
+    }
+}
+
 #[derive(Debug, Clone)]
 pub struct Package {
     pub entrypoint: Spanned<PackagePath>,

tests/local/sixth/0.1.0/LICENSE

@@ -0,0 +1 @@
+totally an MIT license

tests/local/sixth/0.1.0/README.md

@@ -0,0 +1,3 @@
+# sixth
+
+:)

tests/local/sixth/0.1.0/typst.toml

@@ -0,0 +1,12 @@
+[package]
+name = "sixth"
+version = "0.1.0"
+description = "Useless package"
+authors = ["Some Person"]
+entrypoint = "lib.typ"
+license = "MIT"
+
+[template]
+thumbnail = "missing.png"
+path = "template"
+entrypoint = "example.typ"

tests/ref/local+sixth+0.1.0.txt

@@ -0,0 +1,6 @@
+error[manifest/template/thumbnail/not-found]: This file does not exist.
+   ┌─ typst.toml:10:12
+   │
+10 │ thumbnail = "missing.png"
+   │             ^^^^^^^^^^^^^
+