Function readLastLines

devctx/src/core/parser.ts:471–488

(
    filePath: string,
    maxLines: number
)

// -------------------------------------------------------------------

async function readLastLines(
    filePath: string,
    maxLines: number
): Promise<string[]> {
    const lines: string[] = [];
    const fileStream = fs.createReadStream(filePath, { encoding: "utf-8" });
    const rl = readline.createInterface({ input: fileStream, crlfDelay: Infinity });

    const buffer: string[] = [];
    for await (const line of rl) {
        buffer.push(line);
        if (buffer.length > maxLines * 2) {
            buffer.splice(0, maxLines); // keep a sliding window
        }
    }

    return buffer.slice(-maxLines);
}

function extractTaskFromMessages(messages: string[]): string {
    // First user message is usually the task