first pass of merging in warp (doesn't build)

app/src/terminal/focus_env.rs

@@ -0,0 +1,33 @@
+use std::collections::HashMap;
+use std::ffi::OsString;
+
+use crate::channel::ChannelState;
+
+pub(crate) const FOCUS_URL_ENV: &str = "WARP_FOCUS_URL";
+pub(crate) const TERMINAL_SESSION_UUID_ENV: &str = "WARP_TERMINAL_SESSION_UUID";
+
+pub(crate) fn session_focus_url(session_uuid_hex: &str) -> String {
+    format!(
+        "{}://session/{session_uuid_hex}",
+        ChannelState::url_scheme()
+    )
+}
+
+pub(crate) fn add_session_focus_env_vars(
+    env_vars: &mut HashMap<OsString, OsString>,
+    session_uuid: &[u8],
+) {
+    let session_uuid_hex = hex::encode(session_uuid);
+    env_vars.insert(
+        OsString::from(TERMINAL_SESSION_UUID_ENV),
+        OsString::from(session_uuid_hex.clone()),
+    );
+    env_vars.insert(
+        OsString::from(FOCUS_URL_ENV),
+        OsString::from(session_focus_url(&session_uuid_hex)),
+    );
+}
+
+#[cfg(test)]
+#[path = "focus_env_tests.rs"]
+mod tests;