text: ////////////////////////////////////////////////////////////////////////////////
  //
  // Copyright 2006 - 2021, Paul Beckingham, Federico Hernandez.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  // SOFTWARE.
  //
  // http://www.opensource.org/licenses/mit-license.php
  //
  ////////////////////////////////////////////////////////////////////////////////
  
  #ifndef INCLUDED_CONFIGURATION
  #define INCLUDED_CONFIGURATION
  
  #include <map>
  #include <vector>
  #include <string>
  #include <FS.h>
  
  bool setVariableInFile   (const std::string&, const std::string&, const std::string&);
  bool unsetVariableInFile (const std::string&, const std::string&);
  
  // ct.cpp
  std::vector <std::tuple <std::string, int>> foo (File&);
  
  class Configuration : public std::map <std::string, std::string>
  {
  public:
    void load  (const std::string&, int nest = 1);
    void save ();
    void parse (const std::string&, int nest = 1);
  
    bool        has        (const std::string&) const;
    std::string get        (const std::string&) const;
    int         getInteger (const std::string&) const;
    double      getReal    (const std::string&) const;
    bool        getBoolean (const std::string&) const;
  
    void set (const std::string&, const int);
    void set (const std::string&, const double);
    void set (const std::string&, const std::string&);
    void setIfBlank (const std::string&, const std::string&);
    std::vector <std::string> all () const;
  
    std::string file () const;
  
    bool dirty ();
  
  private:
    File _original_file {};
    bool _dirty         {false};
  };
  
  #endif
  