text: /*
   *   Copyright (c) 2022 Project CHIP Authors
   *   All rights reserved.
   *
   *   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.
   *
   */
  
  #include "InteractiveCommands.h"
  
  #include <readline/history.h>
  #include <readline/readline.h>
  
  char kInteractiveModeName[]                            = "";
  constexpr const char * kInteractiveModePrompt          = ">>> ";
  constexpr uint8_t kInteractiveModeArgumentsMaxLength   = 32;
  constexpr const char * kInteractiveModeHistoryFilePath = "/tmp/chip_tool_history";
  constexpr const char * kInteractiveModeStopCommand     = "quit()";
  
  namespace {
  
  bool gIsCommandRunning = false;
  
  void ClearLine()
  {
      printf("\r\x1B[0J"); // Move cursor to the beginning of the line and clear from cursor to end of the screen
  }
  
  void ENFORCE_FORMAT(3, 0) LoggingCallback(const char * module, uint8_t category, const char * msg, va_list args)
  {
      ClearLine();
      chip::Logging::Platform::LogV(module, category, msg, args);
      ClearLine();
  
      if (gIsCommandRunning == false)
      {
          rl_forced_update_display();
      }
  }
  } // namespace
  
  char * GetCommand(char * command)
  {
      if (command != nullptr)
      {
          free(command);
          command = nullptr;
      }
  
      command = readline(kInteractiveModePrompt);
  
      // Do not save empty lines
      if (command != nullptr && *command)
      {
          add_history(command);
          write_history(kInteractiveModeHistoryFilePath);
      }
  
      return command;
  }
  
  CHIP_ERROR InteractiveStartCommand::RunCommand()
  {
      read_history(kInteractiveModeHistoryFilePath);
  
      // Logs needs to be redirected in order to refresh the screen appropriately when something
      // is dumped to stdout while the user is typing a command.
      chip::Logging::SetLogRedirectCallback(LoggingCallback);
  
      char * command = nullptr;
      while (true)
      {
          command = GetCommand(command);
          if (command != nullptr && !ParseCommand(command))
          {
              break;
          }
      }
  
      SetCommandExitStatus(CHIP_NO_ERROR);
      return CHIP_NO_ERROR;
  }
  
  bool InteractiveStartCommand::ParseCommand(char * command)
  {
      if (strcmp(command, kInteractiveModeStopCommand) == 0)
      {
          return false;
      }
  
      char * args[kInteractiveModeArgumentsMaxLength];
      args[0]       = kInteractiveModeName;
      int argsCount = 1;
  
      char * token = strtok(command, " ");
      while (token != nullptr)
      {
          if (argsCount == kInteractiveModeArgumentsMaxLength)
          {
              gIsCommandRunning = true;
              ChipLogError(chipTool, "Too many arguments. Ignoring.");
              gIsCommandRunning = false;
              return true;
          }
  
          args[argsCount++] = token;
          token             = strtok(nullptr, " ");
      }
  
      ClearLine();
      gIsCommandRunning = true;
      mHandler->RunInteractive(argsCount, args);
      gIsCommandRunning = false;
  
      return true;
  }
  