Truncate method

Truncate.js

export const formateToEllipses = (string = '', maxCharAtOneLine, maxLines) => {
  const ellipses = '...';
  const separator = ' ';
  const words = string.split(separator);
  let lineNum = 1;
  const lines = [];
  let line = '';
  const addEllipses = str => str.substring(0, maxCharAtOneLine - 3) + ellipses;
  const isLargerThanLine = word => word.length > maxCharAtOneLine;
  const gotoNewLine = (isEllipses = false, initial = '') => {
    line = isEllipses ? addEllipses(line) : line;
    lineNum += 1;
    lines.push(line);
    line = initial;
  };
  const generateStrWithEllipses = (word, index) => {
    const isLongerThanLineWord = isLargerThanLine(word);
    const isStillWithinLines = (lineNum < maxLines);
    const isLastWord = index === (words.length - 1);
    const isFirstWord = index === 0;
    const isOneWord = words.length === 1;
    const isLastLine = lineNum === maxLines;
    const temp = line === '' ? word : `${line} ${word}`;
    if (isFirstWord && isLongerThanLineWord) {
      line = word;
      gotoNewLine(true);
      return false;
    }
    if (isOneWord && !isLongerThanLineWord) {
      line = word;
      gotoNewLine();
      return false;
    }
    if (isLastLine) {
      if (isLargerThanLine(temp) || !isLastWord) {
        line = temp;
        gotoNewLine(true);
        return false;
      }
      line = temp;
      gotoNewLine();
      return false;
    }
    if (isStillWithinLines && isLastWord) {
      if (isLargerThanLine(temp)) {
        gotoNewLine(false, word);
        if (isLargerThanLine(word)) {
          gotoNewLine(true);
        } else {
          gotoNewLine();
        }
        return false;
      }
      line = temp;
      gotoNewLine();
      return false;
    }
    if (isStillWithinLines && !isLargerThanLine(temp)) {
      line = temp;
      return;
    }
    if (isStillWithinLines && isLargerThanLine(temp)) {
      gotoNewLine(false, word);
    }
  };
  words.forEach(generateStrWithEllipses);
  return lines.join(separator);
};