Function load_default_user_identity

atomic-agent/src/identity.rs:415–437

Load the user's default identity from the identity store. Looks for `~/.atomic/identities/config.toml` to find the default identity, then loads its `identity.toml` for name/email/public key. Returns `None` if: - The identity store directory doesn't exist - No default identity is configured - The default identity's files can't be read

(override_dir: Option<&Path>)

/// - No default identity is configured
/// - The default identity's files can't be read
fn load_default_user_identity(override_dir: Option<&Path>) -> Option<UserIdentityInfo> {
    let identities_dir = match override_dir {
        Some(dir) => dir.to_path_buf(),
        None => default_identities_dir()?,
    };

    if !identities_dir.is_dir() {
        return None;
    }

    // Read config.toml to find the default identity
    let config_path = identities_dir.join("config.toml");
    let config_content = std::fs::read_to_string(&config_path).ok()?;

    // Parse the config to find the default identity directory name
    let default_id = extract_default_identity_from_config(&config_content)?;

    // Try to find the identity directory
    // The store uses {name}-{usage}-{id_short} as directory names,
    // but we can also match by the ID directly
    load_identity_by_id(&identities_dir, &default_id)
        .or_else(|| load_identity_by_scanning(&identities_dir, &default_id))
}

/// Get the default identities directory: `~/.atomic/identities/`
fn default_identities_dir() -> Option<PathBuf> {