exclude external links: update list (fix #91)

src/utils/markdown.rs

@@ -68,7 +68,37 @@ pub fn get_options(path: Option<FilePath>, metadata_type: MType) -> ComrakOption
             .underline(true)
             .maybe_link_url_rewriter(match metadata_type {
                 MType::Cours => Some(Arc::new(move |url: &str| {
-                    if url.contains("://") {
+                    // Exclude external links
+                    if [
+                        "://",
+                        "mailto:",
+                        "magnet:",
+                        "ftp:",
+                        "tel:",
+                        "irc:",
+                        "geo:",
+                        "ftps:",
+                        "im:",
+                        "ircs:",
+                        "bitcoin:",
+                        "matrix:",
+                        "mms:",
+                        "news:",
+                        "nntp:",
+                        "openpgp4fpr:",
+                        "sftp:",
+                        "sip:",
+                        "sms:",
+                        "smsto:",
+                        "ssh:",
+                        "urn:",
+                        "webcal:",
+                        "wtai:",
+                        "xmpp:",
+                    ]
+                    .iter()
+                    .any(|&item| url.contains(item))
+                    {
                         return String::from(url);
                     }