2 files changed, 32 insertions, 0 deletions
diff --git a/src/terminal/id.rs b/src/terminal/id.rs
new file mode 100644
index 00000000..53ef6786
--- /dev/null
+++ b/src/terminal/id.rs
@@ -0,0 +1,29 @@
+use std::fmt;
+use std::sync::atomic::{AtomicU64, Ordering};
+use std::time::{SystemTime, UNIX_EPOCH};
+
+/// Opaque identity for a server-owned terminal.
+///
+/// During the pane-backed transition this is stored one-to-one beside panes,
+/// but callers must not derive it from a pane id or layout position.
+#[derive(Debug, Clone, PartialEq, Eq, Hash, serde::Serialize, serde::Deserialize)]
+pub struct TerminalId(String);
+
+static NEXT_TERMINAL_ID: AtomicU64 = AtomicU64::new(1);
+
+impl TerminalId {
+    pub fn alloc() -> Self {
+        let micros = SystemTime::now()
+            .duration_since(UNIX_EPOCH)
+            .map(|duration| duration.as_micros())
+            .unwrap_or(0);
+        let counter = NEXT_TERMINAL_ID.fetch_add(1, Ordering::Relaxed);
+        Self(format!("term_{micros:x}{counter:x}"))
+    }
+}
+
+impl fmt::Display for TerminalId {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str(&self.0)
+    }
+}
diff --git a/src/terminal/mod.rs b/src/terminal/mod.rs
new file mode 100644
index 00000000..489f7876
--- /dev/null
+++ b/src/terminal/mod.rs
@@ -0,0 +1,3 @@
+mod id;
+
+pub use id::TerminalId;