argparse.h

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#pragma once
#include <string>
#include <vector>
#include <map>
 
namespace argparse {
 
struct Argument {
  std::string _name;        
  std::string _short_alias; 
  std::string _help;        
 
  enum Action {
    do_nothing,    
    store_false,   
    store_true,    
    show_help,     
  };
 
  Action _action; 
 
  void ShowHelp() const;
};
 
struct Var {
  int _val = 0;        
  std::string _str = ""; 
 
  void Clear() {
    _val = 0;
    _str.clear();
  }
};
 
class ArgumentParser {
  std::vector<Argument> _args; 
  std::map<std::string, Var> _vars; 
 
public:
  enum Result {
    OK = 0,           
    SHOWED_HELP = -128, 
    UNKNOWN_FLAG,     
    BAD_PARAM,        
    UNKNOWN_VAR,      
  };
 
  int GetVarInt(std::string name_, int if_not_found_);
 
  std::string GetVarStr(std::string name_, std::string if_not_found_);
 
private:
  bool _SearchName(std::string name_, Argument& dest_);
 
  bool _SearchShortAlias(std::string short_alias_, Argument& dest_);
 
private:
  std::string _cur_name; 
 
  Result _Action(const Argument& dest, const std::string& it_);
 
public:
  Result ParseArgs(const std::vector<std::string>& args);
 
  bool _showed_help = false; 
 
  void ShowHelp();
 
  int AddArgument(
    std::string name_,
    std::string short_alias_,
    std::string help_,
    Argument::Action action_ = Argument::store_true
  );
 
  ArgumentParser();
};
 
} // namespace argparse