update issue panel

crates/signed_core/src/lib.rs

@@ -9,6 +9,6 @@ pub mod status;
 pub use addr::{RepoAddr, repo_addr};
 pub use clone_url::{CloneTarget, parse_clone_url};
 pub use deletions::Deletions;
-pub use model::Announcement;
+pub use model::{activity_subject, Announcement};
 pub use state::parse_state;
 pub use status::{RepoStatus, references_root, resolve_status};

crates/signed_core/src/model.rs

@@ -26,6 +26,30 @@ pub struct Announcement {
     pub hashtags: Vec<String>,
 }
 
+/// Subject of a NIP-34 issue or pull request event: the `subject` tag,
+/// falling back to the first non-empty line of the content.
+pub fn activity_subject(event: &Event) -> SharedString {
+    let subject = event
+        .tags
+        .iter()
+        .find_map(|tag| match Nip34Tag::parse(tag.as_slice()) {
+            Ok(Nip34Tag::Subject(subject)) => Some(subject),
+            _ => None,
+        });
+
+    subject
+        .map(SharedString::from)
+        .or_else(|| {
+            event
+                .content
+                .lines()
+                .map(str::trim)
+                .find(|line| !line.is_empty())
+                .map(SharedString::from)
+        })
+        .unwrap_or(SharedString::from("Untitled"))
+}
+
 impl Announcement {
     /// Parse a kind `30617` event. Returns `None` if the kind is wrong or the `d` tag is missing.
     pub fn from_event(event: &Event) -> Option<Self> {