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import type { BackendModel } from "./server/models";
import type { Message } from "./types/Message";
import { format } from "date-fns";
import type { WebSearch } from "./types/WebSearch";
/**
* Convert [{user: "assistant", content: "hi"}, {user: "user", content: "hello"}] to:
*
* <|assistant|>hi<|endoftext|><|prompter|>hello<|endoftext|><|assistant|>
*/
interface buildPromptOptions {
messages: Pick<Message, "from" | "content">[];
model: BackendModel;
locals?: App.Locals;
webSearch?: WebSearch;
preprompt?: string;
}
export async function buildPrompt({
messages,
model,
webSearch,
preprompt,
}: buildPromptOptions): Promise<string> {
if (webSearch && webSearch.context) {
const lastMsg = messages.slice(-1)[0];
const messagesWithoutLastUsrMsg = messages.slice(0, -1);
const previousUserMessages = messages.filter((el) => el.from === "user").slice(0, -1);
const previousQuestions =
previousUserMessages.length > 0
? `Previous questions: \n${previousUserMessages
.map(({ content }) => `- ${content}`)
.join("\n")}`
: "";
const currentDate = format(new Date(), "MMMM d, yyyy");
messages = [
...messagesWithoutLastUsrMsg,
{
from: "user",
content: `I searched the web using the query: ${webSearch.searchQuery}. Today is ${currentDate} and here are the results:
=====================
${webSearch.context}
=====================
${previousQuestions}
Answer the question: ${lastMsg.content}
`,
},
];
}
return (
model
.chatPromptRender({ messages, preprompt })
// Not super precise, but it's truncated in the model's backend anyway
.split(" ")
.slice(-(model.parameters?.truncate ?? 0))
.join(" ")
);
}
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