menu rows lead with the agent's session name; harness and place move below

herdr's sidebar shows the session name in place of the harness label (via
the user's herdr-session-name extension). dingger reads it from the title
pi already sets ("π - <name> - <dir>"); other agents use herdr's
terminal_title_stripped rule, and claude's default "Claude Code" title or
tmux's host-name title count as no name. the daemon stores it as
@agent_name for every surface.

menu rows: colored status symbol + name as the title (the harness, dimmed,
only when unnamed), and a native subtitle "session · window · harness",
plus how long done/blocked agents have been waiting; one separator between
agents waiting for you and the rest. dingger status shows the same.

1 files changed, 117 insertions, 0 deletions

diff --git a/crates/dinggerd/src/names.rs b/crates/dinggerd/src/names.rs
new file mode 100644
index 0000000..ef09988
--- /dev/null
+++ b/crates/dinggerd/src/names.rs
@@ -0,0 +1,117 @@
+//! Agent display names: what the agent is working on, taken from the
+//! terminal title the agent sets (herdr's `terminal_title_stripped`, plus
+//! pi's title convention).
+
+use detect_core::Agent;
+
+/// herdr's activity glyphs (src/terminal/title.rs): claude prefixes its title
+/// with one of these, or a braille spinner frame.
+const ACTIVITY_GLYPHS: &str = "·✢✳✶✻✽◐◓◑◒";
+
+/// herdr's `stripped_terminal_title`: drop one recognized leading activity
+/// glyph and the whitespace after it.
+fn stripped_title(title: &str) -> &str {
+    let title = title.trim();
+    let mut chars = title.chars();
+    let Some(first) = chars.next() else {
+        return title;
+    };
+    let rest = chars.as_str();
+    let recognized = matches!(first, '\u{2800}'..='\u{28ff}') || ACTIVITY_GLYPHS.contains(first);
+    if recognized && (rest.is_empty() || rest.starts_with(char::is_whitespace)) {
+        rest.trim()
+    } else {
+        title
+    }
+}
+
+/// The agent's session/task name, if its title carries one.
+///
+/// - pi titles itself `π - <session name> - <cwd basename>`, or
+///   `π - <cwd basename>` when the session has no name.
+/// - other agents (claude) use the title as the task, behind an activity
+///   glyph.
+/// - tmux's default title is the host name: no name.
+pub fn display_name(agent: Option<Agent>, title: &str, cwd: &str, host: &str) -> Option<String> {
+    let title = stripped_title(title);
+    if title.is_empty() || title == host || host.split('.').next() == Some(title) {
+        return None;
+    }
+    let name = match agent {
+        Some(Agent::Pi) => {
+            let rest = title.strip_prefix("π - ")?;
+            let dir = cwd.trim_end_matches('/').rsplit('/').next().unwrap_or("");
+            if !dir.is_empty() && rest == dir {
+                return None;
+            }
+            rest.strip_suffix(&format!(" - {dir}")).filter(|_| !dir.is_empty()).unwrap_or(rest)
+        }
+        // claude's title before it names a task is just the product name.
+        Some(Agent::Claude) if title == "Claude Code" => return None,
+        _ => title,
+    };
+    let name = name.trim();
+    (!name.is_empty()).then(|| name.to_string())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const HOST: &str = "Igor-Soarez-H3H1W71DJ0";
+
+    #[test]
+    fn pi_session_name_between_prefix_and_directory() {
+        assert_eq!(
+            display_name(Some(Agent::Pi), "π - Ship langgraph 1.2.13 release - x", "/Users/sz/x", HOST),
+            Some("Ship langgraph 1.2.13 release".into())
+        );
+        assert_eq!(display_name(Some(Agent::Pi), "π - 9103 - x", "/Users/sz/x", HOST), Some("9103".into()));
+    }
+
+    #[test]
+    fn pi_without_a_session_name_has_no_name() {
+        assert_eq!(display_name(Some(Agent::Pi), "π - x", "/Users/sz/x", HOST), None);
+    }
+
+    #[test]
+    fn pi_name_may_contain_the_separator() {
+        assert_eq!(
+            display_name(Some(Agent::Pi), "π - Fix a - b split - dot", "/Users/sz/x/dot", HOST),
+            Some("Fix a - b split".into())
+        );
+    }
+
+    #[test]
+    fn pi_title_after_cd_keeps_the_rest() {
+        assert_eq!(
+            display_name(Some(Agent::Pi), "π - Task - olddir", "/Users/sz/newdir", HOST),
+            Some("Task - olddir".into())
+        );
+    }
+
+    #[test]
+    fn claude_title_loses_its_activity_glyph() {
+        assert_eq!(
+            display_name(Some(Agent::Claude), "✳ Investigate flaky test", "/tmp", HOST),
+            Some("Investigate flaky test".into())
+        );
+        assert_eq!(
+            display_name(Some(Agent::Claude), "⠋ Investigate flaky test", "/tmp", HOST),
+            Some("Investigate flaky test".into())
+        );
+    }
+
+    #[test]
+    fn claude_default_title_is_not_a_name() {
+        assert_eq!(display_name(Some(Agent::Claude), "✳ Claude Code", "/tmp", HOST), None);
+        assert_eq!(display_name(Some(Agent::Claude), "Claude Code", "/tmp", HOST), None);
+    }
+
+    #[test]
+    fn default_tmux_title_is_not_a_name() {
+        assert_eq!(display_name(Some(Agent::Claude), HOST, "/tmp", HOST), None);
+        assert_eq!(display_name(Some(Agent::Claude), "Igor-Soarez-H3H1W71DJ0", "/tmp", "Igor-Soarez-H3H1W71DJ0.local"), None);
+        assert_eq!(display_name(Some(Agent::Claude), "", "/tmp", HOST), None);
+    }
+}