Function truncateOutputFromStart

extensions/cli/src/util/truncateOutput.ts:43–81

(
  output: string,
  limits: TruncationLimits,
)

 * @param limits - The character and line limits to apply
 */
export function truncateOutputFromStart(
  output: string,
  limits: TruncationLimits,
): TruncationResult {
  if (!output) {
    return { output, wasTruncated: false };
  }

  const { maxChars, maxLines } = limits;
  const lines = output.split("\n");

  // Check if we need to truncate by lines first
  if (lines.length > maxLines) {
    const linesTruncated = lines.length - maxLines;
    const preservedLines = lines.slice(-maxLines);
    const contentAfterLineTruncation = preservedLines.join("\n");

    // After line truncation, check character limit
    if (contentAfterLineTruncation.length > maxChars) {
      return truncateCharactersFromStart(
        contentAfterLineTruncation,
        linesTruncated,
        maxChars,
      );
    }

    return {
      output: `(previous ${linesTruncated} lines truncated)\n\n${contentAfterLineTruncation}`,
      wasTruncated: true,
    };
  }

  // Check character limit
  if (output.length > maxChars) {
    return truncateCharactersFromStart(output, 0, maxChars);
  }

  return { output, wasTruncated: false };
}

/**
 * Truncates output from the end to fit within a character limit, preserving the beginning.