// Syntax: actionListener { doSomething(); }

!592 1000265 // auto-importer, standard function adder 

public class main {
  public static void main(String[] args) throws Exception {
    String s = loadMainJava();
    
    Pattern regex = Pattern.compile("actionListener\\s*\\{");
    
    for (int i = 0; i < 100; i++) {
      Matcher matcher = regex.matcher(s);
      if (!matcher.find())
        break;

      System.out.println("Iteration " + (i+1));
      int start = matcher.start(), end = matcher.end();
      int endOfBlock = findEndOfBlock(s, end);
      
      String listener = "new java.awt.event.ActionListener() {\n" +
        "public void actionPerformed(java.awt.event.ActionEvent _evt) {\n" +
        s.substring(end, endOfBlock) + "\n}";
      s = s.substring(0, start) + listener + s.substring(endOfBlock);
    }
    
    saveMainJava(s);
  }
  
  // start is the index AFTER the opening bracket
  // returns index OF closing bracket
  static int findEndOfBlock(String s, int start) {
    int level = 1;
    for (int i = start; i < s.length(); i++) {
      if (s.charAt(i) == '{') ++level;
      else if (s.charAt(i) == '}') --level;
      if (level == 0)
        return i;
    }
    return s.length();
  }
}

Began life as a copy of #605