Archived
104 lines
3.8 KiB
TypeScript
104 lines
3.8 KiB
TypeScript
import type { Api, AssistantMessage, Model } from "@earendil-works/pi-ai";
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import type { StreamFn } from "@earendil-works/pi-agent-core";
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const SESSION_NAME_TIMEOUT_MS = 10_000;
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const SESSION_NAME_MAX_INPUT_CHARS = 4_000;
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const SESSION_NAME_MAX_LENGTH = 60;
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const FALLBACK_SESSION_NAME_MAX_WORDS = 6;
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const RELAY_HANDOFF_FIRST_LINE = /^Relay\s+"([^"\n]+)"\s+leg\s+(\d+)\s+begins now\.?\s*(?:\n|$)/;
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export function deterministicSessionName(firstMessage: unknown): string | undefined {
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if (typeof firstMessage !== "string") return undefined;
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return relayHandoffSessionName(firstMessage.trimStart());
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}
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export async function generateShortSessionName<TApi extends Api>(streamFn: StreamFn, model: Model<TApi>, firstMessage: string): Promise<string | undefined> {
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const stream = await streamFn(
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model,
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{
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systemPrompt: "Generate a concise title for a coding-agent chat session. Return only the title, with no quotes or punctuation wrapper.",
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messages: [{
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role: "user",
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content: `Create a 2-6 word title for this request:\n\n${truncateInput(firstMessage)}`,
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timestamp: Date.now(),
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}],
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},
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{
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maxTokens: 24,
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reasoning: "minimal",
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signal: AbortSignal.timeout(SESSION_NAME_TIMEOUT_MS),
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},
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);
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let streamedText = "";
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let finalMessage: AssistantMessage | undefined;
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for await (const event of stream) {
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if (event.type === "text_delta") streamedText += event.delta;
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if (event.type === "done") finalMessage = event.message;
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if (event.type === "error") return undefined;
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}
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return cleanSessionName(finalMessage === undefined ? streamedText : textFromAssistant(finalMessage));
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}
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export function fallbackSessionName(firstMessage: unknown): string | undefined {
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if (typeof firstMessage !== "string") return undefined;
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return cleanSessionName(firstMessage
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.replace(/<skill name="[^"]+" location="[^"]+">[\s\S]*?<\/skill>/g, "")
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.replace(/```[\s\S]*?```/g, " ")
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.replace(/[`*_#[\](){}<>]/g, " ")
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.split(/\s+/)
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.filter(Boolean)
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.slice(0, FALLBACK_SESSION_NAME_MAX_WORDS)
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.join(" "));
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}
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export function cleanSessionName(value: string): string | undefined {
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const title = (value.split("\n", 1)[0] ?? "")
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.replace(/^\s*(title|session title)\s*:\s*/i, "")
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.replace(/^\s*["'`]+|["'`.]+\s*$/g, "")
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.replace(/\s+/g, " ")
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.trim()
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.slice(0, SESSION_NAME_MAX_LENGTH)
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.trim();
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return title === "" ? undefined : title;
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}
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function relayHandoffSessionName(firstMessage: string): string | undefined {
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const match = RELAY_HANDOFF_FIRST_LINE.exec(firstMessage);
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if (match === null) return undefined;
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const relayName = match[1]?.replace(/\s+/g, " ").trim();
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const legNumber = match[2];
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if (relayName === undefined || relayName === "" || legNumber === undefined) return undefined;
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return cleanSessionName(formatRelaySessionName(relayName, legNumber));
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}
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function formatRelaySessionName(relayName: string, legNumber: string): string {
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const prefix = "Relay ";
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const suffix = ` leg ${legNumber}`;
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const maxRelayNameLength = Math.max(1, SESSION_NAME_MAX_LENGTH - prefix.length - suffix.length);
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const displayedRelayName = truncateRelayName(relayName, maxRelayNameLength);
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return `${prefix}${displayedRelayName}${suffix}`;
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}
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function truncateRelayName(relayName: string, maxLength: number): string {
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if (relayName.length <= maxLength) return relayName;
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const truncated = relayName.slice(0, maxLength).replace(/[\s._-]+$/g, "").trim();
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return truncated === "" ? relayName.slice(0, maxLength).trim() : truncated;
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}
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function textFromAssistant(message: AssistantMessage): string {
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return message.content
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.filter((part) => part.type === "text")
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.map((part) => part.text)
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.join("");
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}
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function truncateInput(value: string): string {
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return value.length <= SESSION_NAME_MAX_INPUT_CHARS ? value : `${value.slice(0, SESSION_NAME_MAX_INPUT_CHARS)}…`;
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}
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