LaTeX Colorizer for Google Documents.Just add it as a script to your GDoc via Tools -> Script Editor (then create a blank script and copy-paste). Don't forget to plug in your GDoc ID in the right place (you can take it right off the URL). Rob Miller's group from CSAIL also created a similar thing: https://github.com/uid/gdoc-downloader/blob/mast…

GDoc LaTex Colorizer

function onOpen() {
  // Add a menu with items to colorize the whole document or colorize around the cursor only
  DocumentApp.getUi().createMenu('LaTeX')
    .addItem('Colorize LaTeX global', 'searchAndReplace')
    .addItem('Colorize LaTeX local', 'searchAndReplaceLocal')
    .addToUi();
}

/**
 * "normalize" the text, remove coloring
 */
function normalizeElement(p) {
  if(p == null) return;
  if(typeof p === 'undefined') return;
  
  //normalize paragraph text
  if(p.getType() == DocumentApp.ElementType.PARAGRAPH)
    p.setHeading(DocumentApp.ParagraphHeading.NORMAL);
  
  p.editAsText().setForegroundColor('#000000').setBackgroundColor("#ffffff");
}

function colorizeHeading(p) {
  var isTitle = false;
  var sr = p.findText("\\\\title{[^}]+}");
  if(sr != null) {
    p.setHeading(DocumentApp.ParagraphHeading.TITLE);     
    isTitle = true;
  }
  
  sr = p.findText("\\\\section{[^}]+}");
  if(sr != null) {
    p.setHeading(DocumentApp.ParagraphHeading.HEADING1);     
    isTitle = true;
  }
  
  sr = p.findText("\\\\subsection{[^}]+}");
  if(sr != null) {
    p.setHeading(DocumentApp.ParagraphHeading.HEADING2);     
    isTitle = true;
  }
  
  sr = p.findText("\\\\subsubsection{[^}]+}");
  if(sr != null) {
    p.setHeading(DocumentApp.ParagraphHeading.HEADING3);     
    isTitle = true;
  }
  
  //Not a heading - normalize again to 11pt, no bold or italic, Arial font
  if(!isTitle) {
    p.editAsText()
    .setBold(false)
    .setItalic(false)
    .setFontFamily(DocumentApp.FontFamily.ARIAL)
    .setFontSize(11);
  }
}

/**
 * Colorize the paragraph's LaTeX commands
 */
function colorizeParagraph(p) {
  var sr = p.findText("[^\\\\]%.+$");
    if(sr != null)
      sr.getElement().editAsText().setForegroundColor(sr.getStartOffset(),sr.getEndOffsetInclusive(),'#11aa11');
    else {
      sr = p.findText("^%.+$");
      if(sr != null)
        sr.getElement().editAsText().setForegroundColor(sr.getStartOffset(),sr.getEndOffsetInclusive(),'#11aa11');
      else {
        //.setHeading works on Paragraph objects only, so check for that
        if(p.getType() == DocumentApp.ElementType.PARAGRAPH) {
          colorizeHeading(p);
        }
        
        sr = p.findText("\\\\[a-zA-Z]+");
        while(sr != null) {
          sr.getElement().editAsText().setForegroundColor(sr.getStartOffset(),sr.getEndOffsetInclusive(),'#0000ff');      
          sr = p.findText("\\\\[a-zA-Z]+",sr);
        }
      
        sr = p.findText("\\\\textbf{[^}]+");
        while(sr != null) {
          sr.getElement().editAsText().setBold(sr.getStartOffset()+8,sr.getEndOffsetInclusive(),true);     
          sr = p.findText("\\\\textbf{[^}]+",sr);
        }
        
        sr = p.findText("\\\\textit{[^}]+");
        while(sr != null) {
          sr.getElement().editAsText().setItalic(sr.getStartOffset()+8,sr.getEndOffsetInclusive(),true);     
          sr = p.findText("\\\\textit{[^}]+",sr);
        }    
      }
    }
}

/**
 * Colorize around the cursor only - will be faster
 */
function searchAndReplaceLocal() {
  var cursor = DocumentApp.getActiveDocument().getCursor();
  var p = cursor.getElement();
  normalizeElement(p);
  colorizeParagraph(p);
}

/**
 * Colorizes the entire document, work paragraph-by-paragraph
 */
function searchAndReplace() {
  var bodyElement = DocumentApp.getActiveDocument().getBody();
  normalizeElement(bodyElement);
  
  var ps = bodyElement.getParagraphs();
  for (var i = 0; i < ps.length; ++i) {
    var p = ps[i];
    
    normalizeElement(p);
    colorizeParagraph(p);
  }
  
  /*
  var sr = bodyElement.findText("\\\\if");
  if(sr != null) {
    DocumentApp.getUi().alert("found if at " + sr.getStartOffset());
    var endsr = bodyElement.findText("\\\\fi", sr);
    if(endsr != null)
      bodyElement.editAsText().setForegroundColor(sr.getStartOffset(), endsr.getEndOffsetInclusive(), '#050505');
  } 
  */
}