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 #ifndef CONDTOOLS_HCAL_CMDLINE_H_
 #define CONDTOOLS_HCAL_CMDLINE_H_
 
 //=========================================================================
 // CmdLine.h
 //
 // Simple command line parser for the C++ "main" program. It provides
 // functionality of "getopt" and "getopt_long" with a convenient interface.
 // Typical usage is as follows:
 //
 // #include <necessary standard headers>
 //
 // #include "CmdLine.h"
 //
 // using namespace cmdline;
 //
 // int main(int argc, char *argv[])
 // {
 //     CmdLine cmdline(argc, argv);
 //
 //     int i = 0;
 //     double d = 0;
 //     bool b = false;
 //     std::string requiredOption;
 //     std::vector<std::string> positionalArgs;
 //
 //     try {
 //         /* Arguments are short and long versions of the option name. */
 //         /* Long version can be omitted. If you want to use the long  */
 //         /* version only, call the two-argument method with the short */
 //         /* version set to 0.                                         */
 //         cmdline.option("-i", "--integer") >> i;
 //         cmdline.option("-d") >> d;
 //
 //         /* Options that must be present on the command line  */
 //         cmdline.require("-r", "--required") >> requiredOption;
 //
 //         /* Switches that do not require subsequent arguments */
 //         b = cmdline.has("-b");
 //
 //         /* Declare the end of option processing. Unconsumed options  */
 //         /* will cause an exception to be thrown.                     */
 //         cmdline.optend();
 //
 //         /* Process all remaining arguments */
 //         while (cmdline)
 //         {
 //             std::string s;
 //             cmdline >> s;
 //             positionalArgs.push_back(s);
 //         }
 //     }
 //     catch (const CmdLineError& e) {
 //         std::cerr << "Error in " << cmdline.progname() << ": "
 //                   << e.str() << std::endl;
 //         return 1;
 //     }
 //
 //     /* ..... Do main processing here ..... */
 //
 //     return 0;
 // }
 //
 // Short version options must use a single character. It is possible
 // to combine several short options together on the command line,
 // for example, "-xzvf" is equivalent to "-x -z -v -f".
 //
 // Use standalone "-" to indicate that the next argument is either
 // an option value or the program argument (but not a switch), even
 // if it starts with "-". This is useful if the option value has to
 // be set to a negative number.
 //
 // Use standalone "--" (not preceded by standalone "-") to indicate
 // the end of options. All remaining arguments will be treated as
 // program arguments, even if they start with "-".
 //
 // Note that each of the parsing methods of the CmdLine class ("option",
 // "has", and "require") is greedy. These methods will consume all
 // corresponding options or switches and will set the result to the last
 // option value seen. It is therefore impossible to provide a collection
 // of values by using an option more than once. This is done in order to
 // avoid difficulties with deciding what to do when multiple option values
 // were consumed by the user code only partially.
 //
 // After the "optend()" call, the "argc()" method of the CmdLine
 // class can be used to determine the number of remaining program
 // arguments. If the expected number of arguments is known in advance,
 // the simplest way to get the arguments out is like this (should be
 // inside the "try" block):
 //
 // if (cmdline.argc() != n_expected)
 //     throw CmdLineError("wrong number of command line arguments");
 // cmdline >> arg0 >> arg1 >> ...;
 //
 // I. Volobouev
 // January 2016
 //=========================================================================
 
 #include <list>
 #include <sstream>
 #include <cstring>
 #include <utility>
 #include <cstdio>
 
 #ifdef __GNUC__
 #include <cstdlib>
 #include <typeinfo>
 #include <cxxabi.h>
 #endif
 
 #ifdef __GXX_EXPERIMENTAL_CXX0X__
 #include <memory>
 #define CmdLine_shared_ptr std::shared_ptr
 #else
 #include <tr1/memory>
 #define CmdLine_shared_ptr std::tr1::shared_ptr
 #endif
 
 namespace cmdline {
 
   // Subsequent classes will throw exceptions of the following class
   class CmdLineError {
   public:
     inline CmdLineError(const char* msg = nullptr) : os_(new std::ostringstream()) {
       if (msg)
         *os_ << msg;
     }
 
     template <typename T>
     inline CmdLineError& operator<<(const T& obj) {
       *os_ << obj;
       return *this;
     }
 
     inline std::string str() const { return os_->str(); }
 
   private:
     CmdLine_shared_ptr<std::ostringstream> os_;
   };
 
   template <typename T>
   inline void OneShotExtract(std::istringstream& is, T& obj) {
     is >> obj;
   }
 
   template <>
   inline void OneShotExtract<std::string>(std::istringstream& is, std::string& obj) {
     obj = is.str();
     is.seekg(0, std::ios_base::end);
   }
 
   class OneShotIStream {
   public:
     inline OneShotIStream() : valid_(false), readout_(false) {}
 
     inline OneShotIStream(const std::string& s) : str_(s), valid_(true), readout_(false) {}
 
     inline operator void*() const { return valid_ && !readout_ ? (void*)this : (void*)nullptr; }
 
     template <typename T>
     inline bool operator>>(T& obj) {
       if (readout_)
         throw CmdLineError() << "can't reuse command line argument \"" << str_ << '"';
       readout_ = true;
       if (valid_) {
         std::istringstream is(str_);
         OneShotExtract(is, obj);
         if (is.bad() || is.fail())
           throw CmdLineError() << "failed to parse command line argument \"" << str_ << '"'
 #ifdef __GNUC__
                                << ", " << demangle(obj) << " expected"
 #endif
               ;
         if (is.peek() != EOF)
           throw CmdLineError() << "extra characters in command line argument \"" << str_ << '"'
 #ifdef __GNUC__
                                << ", " << demangle(obj) << " expected"
 #endif
               ;
       }
       return valid_;
     }
 
     inline bool isValid() const { return valid_; }
 
   private:
     std::string str_;
     bool valid_;
     bool readout_;
 
 #ifdef __GNUC__
     template <typename T>
     inline std::string demangle(T& obj) const {
       int status;
       const std::type_info& ti = typeid(obj);
       char* realname = abi::__cxa_demangle(ti.name(), nullptr, nullptr, &status);
       std::string s(realname);
       free(realname);
       return s;
     }
 #endif
   };
 
   class CmdLine {
     // Argument codes (second member of the pair):
     //   0 -- possible option value (or program argument, not yet known which)
     //   1 -- short option switch
     //   2 -- long option switch
     //   3 -- program argument
     typedef std::pair<std::string, int> Pair;
     typedef std::list<Pair> Optlist;
 
     inline Optlist::iterator find(const char* shortOpt, const char* longOpt) {
       Optlist::iterator iend = args_.end();
       for (Optlist::iterator it = args_.begin(); it != iend; ++it) {
         if (shortOpt && it->second == 1 && it->first == shortOpt)
           return it;
         if (longOpt && it->second == 2 && it->first == longOpt)
           return it;
       }
       return iend;
     }
 
   public:
     inline CmdLine(const unsigned argc, const char* const argv[]) : nprogargs_(0) {
       // Parse the program name
       const char* progname = std::strrchr(argv[0], '/');
       if (progname)
         ++progname;
       else
         progname = argv[0];
 
       // Take into account program name mangling by GNU autotools
       if (strncmp(progname, "lt-", 3) == 0)
         progname += 3;
       progname_ = progname;
 
       // Make a list of arguments noting on the way if this is
       // a short option, long option, or possible option argument
       bool previousIsOpt = false;
       bool nextIsArg = false;
       for (unsigned i = 1; i < argc; ++i) {
         if (nextIsArg) {
           args_.push_back(Pair(argv[i], previousIsOpt ? 0 : 3));
           previousIsOpt = false;
           ++nprogargs_;
           nextIsArg = false;
         } else if (strcmp(argv[i], "-") == 0)
           nextIsArg = true;
         else if (strcmp(argv[i], "--") == 0) {
           // End of options
           for (unsigned k = i + 1; k < argc; ++k) {
             args_.push_back(Pair(argv[k], 3));
             ++nprogargs_;
           }
           return;
         } else if (strncmp(argv[i], "--", 2) == 0) {
           args_.push_back(Pair(argv[i], 2));
           previousIsOpt = true;
         } else if (argv[i][0] == '-') {
           const unsigned len = strlen(argv[i]);
           for (unsigned k = 1; k < len; ++k) {
             std::string dummy("-");
             dummy += argv[i][k];
             args_.push_back(Pair(dummy, 1));
             previousIsOpt = true;
           }
         } else {
           args_.push_back(Pair(argv[i], previousIsOpt ? 0 : 3));
           previousIsOpt = false;
           ++nprogargs_;
         }
       }
     }
 
     inline const char* progname() const { return progname_.c_str(); }
 
     inline bool has(const char* shortOpt, const char* longOpt = nullptr) {
       bool found = false;
       for (Optlist::iterator it = find(shortOpt, longOpt); it != args_.end(); it = find(shortOpt, longOpt)) {
         found = true;
         Optlist::iterator it0(it);
         if (++it != args_.end())
           if (it->second == 0)
             it->second = 3;
         args_.erase(it0);
       }
       return found;
     }
 
     inline OneShotIStream option(const char* shortOpt, const char* longOpt = nullptr) {
       OneShotIStream result;
       for (Optlist::iterator it = find(shortOpt, longOpt); it != args_.end(); it = find(shortOpt, longOpt)) {
         Optlist::iterator it0(it);
         if (++it != args_.end())
           if (it->second == 0) {
             result = OneShotIStream(it->first);
             args_.erase(it0, ++it);
             --nprogargs_;
             continue;
           }
         throw CmdLineError() << "missing command line argument for option \"" << it0->first << '"';
       }
       return result;
     }
 
     inline OneShotIStream require(const char* shortOpt, const char* longOpt = nullptr) {
       const OneShotIStream& is(option(shortOpt, longOpt));
       if (!is.isValid()) {
         const char empty[] = "";
         const char* s = shortOpt ? shortOpt : (longOpt ? longOpt : empty);
         throw CmdLineError() << "required command line option \"" << s << "\" is missing";
       }
       return is;
     }
 
     inline void optend() const {
       for (Optlist::const_iterator it = args_.begin(); it != args_.end(); ++it)
         if (it->second == 1 || it->second == 2)
           throw CmdLineError("invalid command line option \"") << it->first << '"';
     }
 
     inline operator void*() const { return (void*)(static_cast<unsigned long>(nprogargs_)); }
 
     inline unsigned argc() const { return nprogargs_; }
 
     template <typename T>
     inline CmdLine& operator>>(T& obj) {
       if (!nprogargs_)
         throw CmdLineError("no more input available on the command line");
       Optlist::iterator it = args_.begin();
       for (; it != args_.end(); ++it)
         if (it->second == 0 || it->second == 3)
           break;
       OneShotIStream is(it->first);
       args_.erase(it);
       --nprogargs_;
       is >> obj;
       return *this;
     }
 
   private:
     CmdLine() = delete;
 
     std::string progname_;
     Optlist args_;
     unsigned nprogargs_;
   };
 
 }  // namespace cmdline
 
 #endif  // CONDTOOLS_HCAL_CMDLINE_H_

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