DocToLatex.gs

const TITLE = 1;
const BODY = 0;
const AUTHOR = "Asad Hasan (Alex)";
const AUTHOR_TITLE = "Theoretical Computational Scientist";
// Edit these title patterns
const titlePatterns = ["Preface", "Foreword", "Chapter\\s\\d.+"];

const noIndentChapterPatterns = ["Preface", "Chapter 12.+"];

function main() {
  const { chapterTitle, chapterTitleTest } = chapterRegex();
  let noIndentRegex = chapterIndentRegex();
  let doc = DocumentApp.getActiveDocument();
  let text = doc.getBody().getText();
  let title = doc.getName();
  let chapterTexts = text.split(chapterTitle);
  let template = initializeTemplate(title);
  let previousNoIndent = false;
  let i = 0;
  for (let chapterText of chapterTexts) {
    if (chapterText) {
      if (chapterTitleTest.test(chapterText)) {
        previousNoIndent = false;
        if (noIndentRegex.test(chapterText)) previousNoIndent = true;
        template += `\\chapter*{${chapterText.trim()}}
`;
      } else if (previousNoIndent) {
        template += `${chapterText}
`;
      } else {
        template += `${indentParagraph(chapterText)}
`;
      }
    }
  }
  template += `\\end{document}`;
  // Create a file in Google Drive
  let folder = DriveApp.getRootFolder(); // Change to the desired folder if needed
  let fileName = `${title}.tex`; // Name of the file
  folder.createFile(fileName, template);
}

function indentParagraph(paragraphText) {
  return paragraphText
    .trim()
    .replace(/^/g, "\n\\indent ")
    .replace(/\n/g, "\n\n\\indent ");
}

function initializeTemplate(title) {
  let template = `\\documentclass[ebook,12pt,oneside,openany]{memoir}
\\usepackage[utf8x]{inputenc}
\\usepackage[english]{babel}
\\usepackage{url}
\\usepackage{titlesec}
\\usepackage{lettrine}
\\usepackage{amsthm}
\\usepackage{amssymb}

% for placeholder text
\\usepackage{lipsum}

\\title{${title}}
\\author{${AUTHOR} \\\\ ${AUTHOR_TITLE}}

% Remove the generated chapter title
\\titleformat{\\chapter}[display]
  {\\normalfont\\huge\\bfseries}{}{0pt}{\\Huge}
\\titlespacing*{\\chapter}{0pt}{-50pt}{40pt}

\\newtheorem*{proposition}{Proposition} % Define theorem environment without numbering
\\newtheorem*{thoughtexperiment}{Thought Experiment} % Define theorem environment without numbering

\\begin{document}
\\makeatletter
\\renewcommand{\\@date}{} % Remove the definition of \\@date
\\makeatother
\\maketitle
`;
  return template;
}

function chapterRegex() {
  let chapterTitleLiteral = "";
  let chapterTitleTestLiteral = "";
  for (let p of titlePatterns) {
    chapterTitleLiteral += `(${p})|`;
    chapterTitleTestLiteral += `(^${p})|`;
  }
  chapterTitleLiteral = chapterTitleLiteral.replace(/\|$/, "");
  chapterTitleTestLiteral = chapterTitleTestLiteral.replace(/\|$/, "");
  const chapterTitle = new RegExp(chapterTitleLiteral, "g");
  const chapterTitleTest = new RegExp(chapterTitleTestLiteral, "g");
  return { chapterTitle, chapterTitleTest };
}

function chapterIndentRegex() {
  let chapterTitleLiteral = "";
  for (let p of noIndentChapterPatterns) {
    chapterTitleLiteral += `(${p})|`;
  }
  chapterTitleLiteral = chapterTitleLiteral.replace(/\|$/, "");
  const chapterTitle = new RegExp(chapterTitleLiteral, "g");
  return chapterTitle;
}