Function load

src/shell_session_store.rs:86–101

Look up a previously-registered value by walking up the process tree from this process. Returns `None` if no ancestor has registered a value.

(kind: SessionKind)

/// Look up a previously-registered value by walking up the process tree from
/// this process. Returns `None` if no ancestor has registered a value.
pub(crate) fn load<T: DeserializeOwned>(kind: SessionKind) -> Result<Option<T>> {
    let dir = get_root_dir(kind);
    let mut current_pid = std::process::id() as pid_t;

    while let Some(parent_pid) = get_parent_pid(current_pid) {
        let path = get_state_file_path(&dir, parent_pid);
        if path.exists() {
            let raw = std::fs::read_to_string(path)?;
            let value: T = serde_json::from_str(&raw)?;
            return Ok(Some(value));
        }
        current_pid = parent_pid;
    }

    Ok(None)
}