escape special prefixes in plaintext nodes

gemtext/src/lib.rs

@@ -60,7 +60,13 @@ pub fn render(nodes: Vec<Node>, out: &mut impl Write) -> io::Result<()> {
 
     for node in nodes {
         match node {
-            Text(body) => write!(out, "{}\n", body)?,
+            Text(body) => {
+                let special_prefixes = ["=>", "```", "#", "*", ">"];
+                if special_prefixes.iter().any(|prefix| body.starts_with(prefix)) {
+                    write!(out, " ")?;
+                }
+                write!(out, "{}\n", body)?
+            },
             Link { to, name } => match name {
                 Some(name) => write!(out, "=> {} {}\n", to, name)?,
                 None => write!(out, "=> {}\n", to)?,
@@ -337,4 +343,15 @@ mod tests {
         ];
         assert_eq!(expected, parse(msg));
     }
+
+    #[test]
+    fn ambiguous_text() {
+        let _ = pretty_env_logger::try_init();
+        let original = Node::Text("#1 World's Best Coder".to_string());
+        let expected = " #1 World's Best Coder\n";
+        let mut rendered: Vec<u8> = vec![];
+        render(vec![original], &mut rendered).unwrap();
+        let rendered = String::from_utf8(rendered).unwrap();
+        assert_eq!(expected, rendered)
+    }
 }