Function selectDef

src/lib/item-input/select.ts:42–91

(
		name: string,
		choices: SelectDefChoice<T>[],
		options?: SelectDefOptions<T>,
)

 * @param options See definition of `SelectDefOptions` for more details.
 */
export function selectDef<T>(
		name: string,
		choices: SelectDefChoice<T>[],
		options?: SelectDefOptions<T>,
): InputDefinition<T> {
	const nameOfChoice = (choice: SelectDefChoice<T>): string =>
		typeof choice === 'object' ? choice.name : choice.toString()
	const valueOfChoice = (choice: SelectDefChoice<T>): T =>
		(typeof choice === 'number' || typeof choice === 'string' ? choice : choice.value) as T

	const namesByValue = new Map(choices.map(choice => [valueOfChoice(choice), nameOfChoice(choice)]))

	const editValue = async (defaultSelection: T | undefined): Promise<T | CancelAction> => {
		const inquirerChoices: (Choice<T | CancelAction | HelpAction>)[] = choices.map(choice => ({
			name: nameOfChoice(choice),
			value: valueOfChoice(choice),
		}))

		inquirerChoices.push(new Separator())
		if (options?.helpText) {
			inquirerChoices.push(helpOption)
		}
		inquirerChoices.push(cancelOption)

		// eslint-disable-next-line no-constant-condition
		while (true) {
			const selection = await select({
				message: `Select ${name}.`,
				choices: inquirerChoices,
				default: defaultSelection ?? 0,
				pageSize: inquirerPageSize,
			})

			if (selection === helpAction) {
				console.log(`\n${options?.helpText}\n`)
			} else {
				return selection
			}
		}
	}

	const buildFromUserInput = (): Promise<T | CancelAction> => editValue(options?.default)

	const summarizeForEdit = options?.summarizeForEdit
		?? ((value: T) => clipToMaximum((namesByValue.get(value)) ?? stringFromUnknown(value), maxItemValueLength))

	const updateFromUserInput = (original: T): Promise<T | CancelAction> => editValue(original)

	return { name, buildFromUserInput, summarizeForEdit, updateFromUserInput }
}