Add `ToString` support for transport URLs

Signed-off-by: Alexis Sellier <alexis@radicle.xyz>

radicle/src/storage/git/transport/local/url.rs

@@ -1,4 +1,5 @@
 //! Git local transport URLs.
+use std::fmt;
 use std::str::FromStr;
 
 use thiserror::Error;
@@ -47,6 +48,16 @@ impl Url {
     pub const SCHEME: &str = "rad";
 }
 
+impl fmt::Display for Url {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        if let Some(ns) = self.namespace {
+            write!(f, "{}://{}/{}", Self::SCHEME, self.repo, ns)
+        } else {
+            write!(f, "{}://{}", Self::SCHEME, self.repo)
+        }
+    }
+}
+
 impl FromStr for Url {
     type Err = UrlError;
 
@@ -103,4 +114,23 @@ mod test {
             .parse::<Url>()
             .is_err());
     }
+
+    #[test]
+    fn test_url_to_string() {
+        let repo = Id::from_str("z2w8RArM3gaBXZxXhQUswE3hhLcss").unwrap();
+        let namespace =
+            Namespace::from_str("z6Mkifeb5NPS6j7JP72kEQEeuqMTpCAVcHsJi1C86jGTzHRi").unwrap();
+
+        let url = Url {
+            repo,
+            namespace: None,
+        };
+        assert_eq!(url.to_string(), format!("rad://{repo}"));
+
+        let url = Url {
+            repo,
+            namespace: Some(namespace),
+        };
+        assert_eq!(url.to_string(), format!("rad://{repo}/{namespace}"));
+    }
 }

radicle/src/storage/git/transport/remote/url.rs

@@ -1,4 +1,5 @@
 //! Git remote transport URLs.
+use std::fmt;
 use std::str::FromStr;
 
 use thiserror::Error;
@@ -49,6 +50,16 @@ impl Url {
     pub const SCHEME: &str = "heartwood";
 }
 
+impl fmt::Display for Url {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        if let Some(ns) = self.namespace {
+            write!(f, "{}://{}/{}/{}", Self::SCHEME, self.node, self.repo, ns)
+        } else {
+            write!(f, "{}://{}/{}", Self::SCHEME, self.node, self.repo)
+        }
+    }
+}
+
 impl FromStr for Url {
     type Err = UrlError;