2 files changed, 51 insertions, 0 deletions

diff --git a/crates/ra_syntax/src/ast/test.txt b/crates/ra_syntax/src/ast/test.txt
new file mode 100644
index 000000000..f746bf1e7
--- /dev/null
+++ b/crates/ra_syntax/src/ast/test.txt
@@ -0,0 +1,15 @@
+The context is a general utility struct provided on event dispatches, which
+helps with dealing with the current "context" of the event dispatch.
+The context also acts as a general high-level interface over the associated
+[`Shard`] which received the event, or the low-level [`http`] module.
+
+The context contains "shortcuts", like for interacting with the shard.
+Methods like [`set_activity`] will unlock the shard and perform an update for
+you to save a bit of work.
+
+A context will only live for the event it was dispatched for. After the
+event handler finished, it is destroyed and will not be re-used.
+
+[`Shard`]: ../gateway/struct.Shard.html
+[`http`]: ../http/index.html
+[`set_activity`]: #method.set_activity
diff --git a/crates/ra_syntax/src/ast/traits.rs b/crates/ra_syntax/src/ast/traits.rs
index a8f2454fd..323d78bbc 100644
--- a/crates/ra_syntax/src/ast/traits.rs
+++ b/crates/ra_syntax/src/ast/traits.rs
@@ -146,3 +146,39 @@ impl Iterator for CommentIter {
         self.iter.by_ref().find_map(|el| el.into_token().and_then(ast::Comment::cast))
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use comrak::{parse_document,format_commonmark, ComrakOptions, Arena};
+    use comrak::nodes::{AstNode, NodeValue};
+
+    fn iter_nodes<'a, F>(node: &'a AstNode<'a>, f: &F)
+        where F : Fn(&'a AstNode<'a>) {
+        f(node);
+        for c in node.children() {
+            iter_nodes(c, f);
+        }
+    }
+
+    #[allow(non_snake_case)]
+    #[test]
+    fn test_link_rewrite() {
+        let src = include_str!("./test.txt");
+
+        let arena = Arena::new();
+        let doc = parse_document(&arena, src, &ComrakOptions::default());
+
+        iter_nodes(doc, &|node| {
+            match &mut node.data.borrow_mut().value {
+                &mut NodeValue::Link(ref mut link) => {
+                    link.url = "https://www.google.com".as_bytes().to_vec();
+                },
+                _ => ()
+            }
+        });
+
+        let mut out = Vec::new();
+        format_commonmark(doc, &ComrakOptions::default(), &mut out);
+        panic!("{}", String::from_utf8(out).unwrap());
+    }
+}