feat: out-of-box experience (#2)

Reviewed-on: https://git.reya.su/reya/signed/pulls/2

crates/signed_core/src/addr.rs

@@ -1,44 +1,13 @@
-use std::fmt;
-use std::str::FromStr;
-
 use nostr::prelude::*;
 
 /// Address of a NIP-34 repository announcement: `30617:<owner-pubkey>:<repo-id>`.
-#[derive(Debug, Clone, PartialEq, Eq, Hash)]
-pub struct RepoAddr {
-    pub owner: PublicKey,
-    pub id: String,
-}
-
-impl RepoAddr {
-    pub fn new(owner: PublicKey, id: impl Into<String>) -> Self {
-        Self {
-            owner,
-            id: id.into(),
-        }
-    }
-
-    /// The NIP-33 coordinate for the announcement event (`a` tag value).
-    pub fn coordinate(&self) -> Coordinate {
-        Coordinate::new(Kind::GitRepoAnnouncement, self.owner).identifier(self.id.clone())
-    }
-}
-
-impl fmt::Display for RepoAddr {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{}", self.coordinate())
-    }
-}
-
-impl FromStr for RepoAddr {
-    type Err = nostr::error::Error;
-
-    /// Parse from `<kind>:<pubkey>:<d-tag>`, `naddr1...` bech32 or `nostr:naddr1...` URI.
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        let coordinate = Coordinate::parse(s)?;
-        Ok(Self {
-            owner: coordinate.public_key,
-            id: coordinate.identifier,
-        })
-    }
+///
+/// The Rust Nostr SDK's [`Coordinate`] already provides parsing, formatting
+/// and hashing for this; the alias keeps the repository-specific vocabulary
+/// while reusing the SDK type.
+pub type RepoAddr = Coordinate;
+
+/// Build the address of a NIP-34 repository announcement.
+pub fn repo_addr(owner: PublicKey, id: impl Into<String>) -> RepoAddr {
+    Coordinate::new(Kind::GitRepoAnnouncement, owner).identifier(id)
 }