text: /*
   * Copyright 2017-present Facebook, Inc.
   *
   * 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.
   */
  #pragma once
  
  #include <folly/Range.h>
  #include <folly/logging/LogFormatter.h>
  
  namespace folly {
  
  /**
   * A LogFormatter implementation that produces messages in a format similar to
   * that produced by the Google logging library.
   *
   * The glog message format is:
   *
   *   LmmDD HH:MM:SS.USECS THREAD [THREADNAME] (THREADCTX) FILE:LINE] MSG
   *
   * L:  A 1-character code describing the log level (e.g., E, W, I, V)
   * mm: 2-digit month
   * DD: 2-digit day
   * HH: 2-digit hour, 24-hour format
   * MM: 2-digit minute
   * SS: 2-digit second
   * USECS: 6-digit microseconds
   * THREAD: Thread ID
   * FILE: Filename (just the last component)
   * LINE: Line number
   * MSG: The actual log message
   *
   * [THREADNAME] is the thread name, and is only included if --logthreadnames
   * was enabled on the command line.
   *
   * (THREADCTX) is thread-local log context data, if it has been set.  (This is
   * a Facebook-specific modification, and is disabled unless --logthreadcontext
   * was enabled on the command line.)
   *
   * Exception information and a custom log prefix may also appear after the
   * file name and line number, before the ']' character.
   */
  class GlogStyleFormatter : public LogFormatter {
   public:
    std::string formatMessage(
        const LogMessage& message,
        const LogCategory* handlerCategory) override;
  };
  } // namespace folly
  