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Where all the magic happens
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/*
 * Copyright 2013 eXo Platform SAS
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package juzu.impl.common;

import juzu.bridge.portlet.JuzuPortlet;
import juzu.impl.compiler.CompilationError;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;
import java.net.URL;
import java.util.concurrent.atomic.AtomicBoolean;

/**
 * Various utilities for formatting stuff.
 *
 * @author Julien Viet
 */
public class Formatting {

  /**
   * Append a script section that will add a stylesheet element in the head section of
   * the document.
   *
   * @param writer the writer
   * @throws IOException any io exception
   */
  public static void renderStyleSheet(Writer writer) throws IOException {
    // Get CSS
    URL cssURL = Formatting.class.getResource("juzu.css");
    String css = Tools.read(cssURL);
    css = css.replace("\"", "\\\"");
    css = css.replace("'", "\\'");
    css = css.replace("\n", "\\n");

    //
    writer.append("\n");
  }

  /**
   * Renders the throwable in the specified writer.
   *
   * @param writer the writer
   * @param t the throwable
   * @throws IOException any io exception
   */
  public static void renderThrowable(Class stop, Writer writer, Throwable t) throws IOException {
    // Trim the stack trace to remove stuff we don't want to see
    int size = 0;
    StackTraceElement[] trace = t.getStackTrace();
    for (StackTraceElement element : trace) {
      if (stop != null && element.getClassName().equals(stop.getName())) {
        break;
      }
      else {
        size++;
      }
    }
    StackTraceElement[] ourTrace = new StackTraceElement[size];
    System.arraycopy(trace, 0, ourTrace, 0, ourTrace.length);
    t.setStackTrace(ourTrace);

    // We hack a bit
    final AtomicBoolean open = new AtomicBoolean(false);
    PrintWriter formatter = new PrintWriter(writer) {
      @Override
      public void println(Object x) {
        if (open.get()) {
          super.append("