lyrics-structure/slide.ts

Parser for lyrics with structured sections, names, and indications

/**
 * Splits text into natural sections based on text structure.
 * Works with plain text without requiring markdown or special formatting.
 * Empty lines are treated as natural separators between parts.
 *
 * @param text - The input text to be split into sections
 * @param maxLinesPerSlide - Maximum number of lines to include in a single slide (default: 6)
 * @returns An array of content sections
 */

import { getLyricsParts } from './lyrics';

const isLineTooLong = (line: string) => line.length > 60;
const processContent = (content: string): string[] => {
  const slides: string[] = [];
  let currentSlide: string[] = [];

  content.split('\n').forEach((line) => {
    const trimmedLine = line.trim();

    if (!trimmedLine) {
      if (currentSlide.length > 0) {
        slides.push(currentSlide.join('\n'));
        currentSlide = [];
      }
      return;
    }

    if (
      currentSlide.length >= 4 ||
      (currentSlide.length >= 2 && currentSlide.filter(isLineTooLong).length >= 2)
    ) {
      slides.push(currentSlide.join('\n'));
      currentSlide = [];
    }

    currentSlide.push(trimmedLine);
  });

  if (currentSlide.length > 0) {
    slides.push(currentSlide.join('\n'));
  }

  return slides;
};

export const getSlideParts = (text?: string): string[] => {
  if (!text) return [];

  // Remove text between parentheses
  const textWithoutParentheses = text.replace(/\([^)]*\)/g, '');
  const partsText = getLyricsParts(textWithoutParentheses).map((part) => part.content);

  const result: string[] = [];

  partsText.forEach((part) => {
    if (part) {
      result.push(...processContent(part));
    }
  });

  return result;
};