Removes both multi-paragraph and single-paragraph language-specific text patterns from a specified Google Document

/**
 * Removes both multi-paragraph and single-paragraph language-specific text patterns from a specified Google Document.
 * Patterns removed:
 *   - Multi-paragraph: A paragraph containing a keyword followed by a paragraph containing 'Copy code'.
 *   - Single-paragraph: A paragraph containing 'keyword\nCopy code'.
 * The removal is case-insensitive.
 */
function removeTextPatternsComprehensively() {
  try {
    // Replace 'YOUR_DOCUMENT_ID_HERE' with your actual Document ID
    var DOCID = 'YOUR_DOCUMENT_ID_HERE';
    
    // Open the document by ID
    var doc = DocumentApp.openById(DOCID);
    var body = doc.getBody();
    
    // Define the list of languages/keywords
    var keywords = [
      'makefile',
      'bash',
      'css',
      'html',
      'javascript',
      'arduino',
      'php',
      'scss',
      'kotlin',
      'csharp',
      'sql',
      'lua',
      'python'
    ];
    
    // Convert keywords to lowercase for case-insensitive comparison
    var keywordsLower = keywords.map(function(word) {
      return word.toLowerCase();
    });
    
    // Get all paragraphs in the document
    var paragraphs = body.getParagraphs();
    
    // Counter for removals
    var removalCount = 0;
    
    // First, handle multi-paragraph patterns
    for (var i = paragraphs.length - 2; i >= 0; i--) {
      var currentParaText = paragraphs[i].getText().trim().toLowerCase();
      var nextParaText = paragraphs[i + 1].getText().trim().toLowerCase();
      
      // Check if current paragraph matches any keyword and next paragraph is 'copy code'
      if (keywordsLower.includes(currentParaText) && nextParaText === 'copy code') {
        // Remove the 'Copy code' paragraph first
        body.removeChild(paragraphs[i + 1]);
        // Then remove the keyword paragraph
        body.removeChild(paragraphs[i]);
        
        removalCount += 2;
        
        // Log the removal
        Logger.log('Removed multi-paragraph patterns at paragraphs ' + (i + 1) + ' and ' + (i + 2));
        
        // To avoid quota limits, save and close the document periodically
        if (removalCount % 20 === 0) { // Adjust the batch size as needed
          doc.saveAndClose();
          // Reopen the document to continue making changes
          doc = DocumentApp.openById(DOCID);
          body = doc.getBody();
          paragraphs = body.getParagraphs(); // Refresh the paragraphs after reopening
        }
      }
    }
    
    // Refresh paragraphs after multi-paragraph removals
    paragraphs = body.getParagraphs();
    
    // Now, handle single-paragraph patterns
    for (var i = paragraphs.length - 1; i >= 0; i--) {
      var para = paragraphs[i];
      var paraText = para.getText().trim();
      
      // Check for patterns within the same paragraph
      var patternRegex = new RegExp('^(' + keywords.join('|') + ')\\s*\\n\\s*Copy code$', 'i');
      
      if (patternRegex.test(paraText)) {
        body.removeChild(para);
        removalCount += 1;
        Logger.log('Removed single-paragraph pattern at paragraph ' + (i + 1));
        
        // Save periodically
        if (removalCount % 20 === 0) {
          doc.saveAndClose();
          doc = DocumentApp.openById(DOCID);
          body = doc.getBody();
          paragraphs = body.getParagraphs();
        }
      }
    }
    
    // Final save after all removals
    doc.saveAndClose();
    
    // Log a confirmation message
    Logger.log("All specified text patterns have been removed successfully. Total removals: " + removalCount);
    
  } catch (e) {
    Logger.log('An error occurred: ' + e.message);
  }
}

/**
 * Adds a custom menu to the Google Docs UI for easy access to the script.
 */
function onOpen() {
  DocumentApp.getUi()
    .createMenu('Custom Scripts')
    .addItem('Remove Text Patterns', 'removeTextPatternsComprehensively')
    .addToUi();
}