Use canonical URL in utils.getRepoURL (#26)

Author: fregante

index.ts

@@ -455,8 +455,15 @@ const getRepoPath = (url: URL | Location = location): string | undefined => {
 	return undefined;
 };
 
-/** Get the 'user/repo' part from an URL */
-const getRepoURL = (url: URL | Location = location): string => url.pathname.slice(1).split('/', 2).join('/');
+/** Get the 'user/repo' part from an URL. Tries using the canonical URL to avoid capitalization errors in the `location` URL */
+const getRepoURL = (url?: URL | Location): string => {
+	if (!url) {
+		const canonical = document.querySelector<HTMLMetaElement>('[property="og:url"]'); // `rel=canonical` doesn't appear on every page
+		url = canonical ? new URL(canonical.content) : location;
+	}
+
+	return url.pathname.slice(1).split('/', 2).join('/');
+};
 
 export const utils = {
 	getUsername,