Function buildTranscriptView

packages/pi-plugin/src/transcript-pi.ts:239–333

* Build the normalized transcript view from a Pi AgentMessage[]. * * Walks the source array once, grouping toolResult runs with the * following user message. Each TranscriptMessage holds its parts * generated lazily (so part proxies can write back to `working`).

(
	working: PiAgentMessage[],
	sessionId: string | undefined,
	markDirty: (messageIndex: number) => void,
	entryIds: readonly (string | undefined)[] | undefined,
)

 * generated lazily (so part proxies can write back to `working`).
 */
function buildTranscriptView(
	working: PiAgentMessage[],
	sessionId: string | undefined,
	markDirty: (messageIndex: number) => void,
	entryIds: readonly (string | undefined)[] | undefined,
): TranscriptMessage[] {
	const result: TranscriptMessage[] = [];

	let i = 0;
	while (i < working.length) {
		const msg = working[i];
		if (msg === undefined) {
			i += 1;
			continue;
		}

		if (msg.role === "toolResult") {
			// Collect contiguous toolResult run.
			const toolResultRun: { msg: PiToolResultMessage; index: number }[] = [];
			while (i < working.length) {
				const candidate = working[i];
				if (candidate === undefined || candidate.role !== "toolResult") break;
				toolResultRun.push({ msg: candidate, index: i });
				i += 1;
			}

			// Look ahead: if the next message is a user message, fold
			// the tool results into it. Otherwise emit a synthetic user
			// message for the run.
			const next = i < working.length ? working[i] : undefined;
			if (next?.role === "user") {
				result.push(
					createUserTranscriptMessage(
						working,
						i,
						sessionId,
						toolResultRun,
						markDirty,
						entryIds,
					),
				);
				i += 1;
			} else {
				result.push(
					createSyntheticToolResultUserMessage(
						working,
						sessionId,
						toolResultRun,
						markDirty,
						entryIds,
					),
				);
			}
			continue;
		}

		if (msg.role === "user") {
			result.push(