/**
 * A session's visual identity: the name it carries before anyone names it, and
 * the palette slot its chip is filled with.
 *
 * Both are pure functions of the session id, which means they need no storage of
 * their own: the id is already in the session header, so a resumed session comes
 * back wearing the same slug and the same colour, and a fork — which mints a new
 * id — gets its own identity instead of quietly wearing its parent's. What *is*
 * stored is an override: `/name` and `/color` write to the session's
 * `session_info` entry, and those win over everything here (see
 * SessionManager.getDisplayName / getSessionColorSlot).
 *
 * This module is deliberately theme-free. It deals in slot *numbers*; mapping a
 * slot onto a colour token is the theme's job, so `core/` never has to reach into
 * a mode's rendering code.
 */
/** Number of colour slots a session can land in. Matches the theme's identity palette. */
export declare const SESSION_COLOR_SLOTS = 6;
/** The auto-assigned name for a session: a memorable two-word slug, e.g. `amber-harbor`. */
export declare function sessionSlugFor(sessionId: string): string;
/** The auto-assigned colour slot for a session, in `1…SESSION_COLOR_SLOTS`. */
export declare function sessionColorSlotFor(sessionId: string): number;
/** Whether `slot` is one a session can actually be assigned. */
export declare function isSessionColorSlot(slot: number): boolean;
/** The canonical slot names, in slot order. For usage lines and pickers. */
export declare const SESSION_COLOR_NAME_LIST: readonly string[];
/** What to call `slot` when reporting it back, or undefined if it is not a slot. */
export declare function sessionColorName(slot: number): string | undefined;
/**
 * The slot an argument to `/color` asks for: a number (`4`), a name
 * (`magenta`), or an initial (`m`). Case and surrounding space do not matter.
 * Undefined when it names no slot at all.
 */
export declare function parseSessionColorSlot(input: string): number | undefined;
/**
 * The slot one step away from `current`, wrapping at both ends.
 *
 * The keyboard cycle needs this rather than a picker because picking a colour is
 * usually a two-second decision made while looking at four terminals: step until
 * the chip stops looking like its neighbour's, then stop. Wrapping means the
 * cycle has no dead end to back out of, and a session sitting on a slot no theme
 * defines — or on nothing at all — starts from the first one rather than
 * refusing to move.
 */
export declare function cycleSessionColorSlot(current: number, direction: "forward" | "backward"): number;
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