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 /*
 
 Copyright (c) 2014, 2015, 2016, 2017 Jarryd Beck
 
 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.
 
 */
 
 #ifndef CXXOPTS_HPP_INCLUDED
 #define CXXOPTS_HPP_INCLUDED
 
 #include <cstring>
 #include <cctype>
 #include <exception>
 #include <iostream>
 #include <map>
 #include <memory>
 #include <regex>
 #include <sstream>
 #include <string>
 #include <unordered_map>
 #include <unordered_set>
 #include <vector>
 #include <limits>
 
 #ifdef __cpp_lib_optional
 #include <optional>
 #define CXXOPTS_HAS_OPTIONAL
 #endif
 
 #define CXXOPTS__VERSION_MAJOR 2
 #define CXXOPTS__VERSION_MINOR 2
 #define CXXOPTS__VERSION_PATCH 0
 
 namespace cxxopts {
   static constexpr struct {
     uint8_t major, minor, patch;
   } version = {CXXOPTS__VERSION_MAJOR, CXXOPTS__VERSION_MINOR, CXXOPTS__VERSION_PATCH};
 }  // namespace cxxopts
 
 //when we ask cxxopts to use Unicode, help strings are processed using ICU,
 //which results in the correct lengths being computed for strings when they
 //are formatted for the help output
 //it is necessary to make sure that <unicode/unistr.h> can be found by the
 //compiler, and that icu-uc is linked in to the binary.
 
 #ifdef CXXOPTS_USE_UNICODE
 #include <unicode/unistr.h>
 
 namespace cxxopts {
   typedef icu::UnicodeString String;
 
   inline String toLocalString(std::string s) { return icu::UnicodeString::fromUTF8(std::move(s)); }
 
   class UnicodeStringIterator : public std::iterator<std::forward_iterator_tag, int32_t> {
   public:
     UnicodeStringIterator(const icu::UnicodeString* string, int32_t pos) : s(string), i(pos) {}
 
     value_type operator*() const { return s->char32At(i); }
 
     bool operator==(const UnicodeStringIterator& rhs) const { return s == rhs.s && i == rhs.i; }
 
     bool operator!=(const UnicodeStringIterator& rhs) const { return !(*this == rhs); }
 
     UnicodeStringIterator& operator++() {
       ++i;
       return *this;
     }
 
     UnicodeStringIterator operator+(int32_t v) { return UnicodeStringIterator(s, i + v); }
 
   private:
     const icu::UnicodeString* s;
     int32_t i;
   };
 
   inline String& stringAppend(String& s, String a) { return s.append(std::move(a)); }
 
   inline String& stringAppend(String& s, int n, UChar32 c) {
     for (int i = 0; i != n; ++i) {
       s.append(c);
     }
 
     return s;
   }
 
   template <typename Iterator>
   String& stringAppend(String& s, Iterator begin, Iterator end) {
     while (begin != end) {
       s.append(*begin);
       ++begin;
     }
 
     return s;
   }
 
   inline size_t stringLength(const String& s) { return s.length(); }
 
   inline std::string toUTF8String(const String& s) {
     std::string result;
     s.toUTF8String(result);
 
     return result;
   }
 
   inline bool empty(const String& s) { return s.isEmpty(); }
 }  // namespace cxxopts
 
 namespace std {
   inline cxxopts::UnicodeStringIterator begin(const icu::UnicodeString& s) {
     return cxxopts::UnicodeStringIterator(&s, 0);
   }
 
   inline cxxopts::UnicodeStringIterator end(const icu::UnicodeString& s) {
     return cxxopts::UnicodeStringIterator(&s, s.length());
   }
 }  // namespace std
 
 //ifdef CXXOPTS_USE_UNICODE
 #else
 
 namespace cxxopts {
   typedef std::string String;
 
   template <typename T>
   T toLocalString(T&& t) {
     return std::forward<T>(t);
   }
 
   inline size_t stringLength(const String& s) { return s.length(); }
 
   inline String& stringAppend(String& s, String a) { return s.append(std::move(a)); }
 
   inline String& stringAppend(String& s, size_t n, char c) { return s.append(n, c); }
 
   template <typename Iterator>
   String& stringAppend(String& s, Iterator begin, Iterator end) {
     return s.append(begin, end);
   }
 
   template <typename T>
   std::string toUTF8String(T&& t) {
     return std::forward<T>(t);
   }
 
   inline bool empty(const std::string& s) { return s.empty(); }
 }  // namespace cxxopts
 
 //ifdef CXXOPTS_USE_UNICODE
 #endif
 
 namespace cxxopts {
   namespace {
 #ifdef _WIN32
     const std::string LQUOTE("\'");
     const std::string RQUOTE("\'");
 #else
     const std::string LQUOTE("‘");
     const std::string RQUOTE("’");
 #endif
   }  // namespace
 
   class Value : public std::enable_shared_from_this<Value> {
   public:
     virtual ~Value() = default;
 
     virtual std::shared_ptr<Value> clone() const = 0;
 
     virtual void parse(const std::string& text) const = 0;
 
     virtual void parse() const = 0;
 
     virtual bool has_default() const = 0;
 
     virtual bool is_container() const = 0;
 
     virtual bool has_implicit() const = 0;
 
     virtual std::string get_default_value() const = 0;
 
     virtual std::string get_implicit_value() const = 0;
 
     virtual std::shared_ptr<Value> default_value(const std::string& value) = 0;
 
     virtual std::shared_ptr<Value> implicit_value(const std::string& value) = 0;
 
     virtual bool is_boolean() const = 0;
   };
 
   class OptionException : public std::exception {
   public:
     OptionException(const std::string& message) : m_message(message) {}
 
     virtual const char* what() const noexcept { return m_message.c_str(); }
 
   private:
     std::string m_message;
   };
 
   class OptionSpecException : public OptionException {
   public:
     OptionSpecException(const std::string& message) : OptionException(message) {}
   };
 
   class OptionParseException : public OptionException {
   public:
     OptionParseException(const std::string& message) : OptionException(message) {}
   };
 
   class Option_exists_error : public OptionSpecException {
   public:
     Option_exists_error(const std::string& option)
         : OptionSpecException("Option " + LQUOTE + option + RQUOTE + " already exists") {}
   };
 
   class Invalid_option_format_error : public OptionSpecException {
   public:
     Invalid_option_format_error(const std::string& format)
         : OptionSpecException("Invalid option format " + LQUOTE + format + RQUOTE) {}
   };
 
   class Option_syntax_exception : public OptionParseException {
   public:
     Option_syntax_exception(const std::string& text)
         : OptionParseException("Argument " + LQUOTE + text + RQUOTE + " starts with a - but has incorrect syntax") {}
   };
 
   class Option_not_exists_exception : public OptionParseException {
   public:
     Option_not_exists_exception(const std::string& option)
         : OptionParseException("Option " + LQUOTE + option + RQUOTE + " does not exist") {}
   };
 
   class Missing_argument_exception : public OptionParseException {
   public:
     Missing_argument_exception(const std::string& option)
         : OptionParseException("Option " + LQUOTE + option + RQUOTE + " is missing an argument") {}
   };
 
   class Option_requires_argument_exception : public OptionParseException {
   public:
     Option_requires_argument_exception(const std::string& option)
         : OptionParseException("Option " + LQUOTE + option + RQUOTE + " requires an argument") {}
   };
 
   class Option_not_has_argument_exception : public OptionParseException {
   public:
     Option_not_has_argument_exception(const std::string& option, const std::string& arg)
         : OptionParseException("Option " + LQUOTE + option + RQUOTE + " does not take an argument, but argument " +
                                LQUOTE + arg + RQUOTE + " given") {}
   };
 
   class Option_not_present_exception : public OptionParseException {
   public:
     Option_not_present_exception(const std::string& option)
         : OptionParseException("Option " + LQUOTE + option + RQUOTE + " not present") {}
   };
 
   class Argument_incorrect_type : public OptionParseException {
   public:
     Argument_incorrect_type(const std::string& arg)
         : OptionParseException("Argument " + LQUOTE + arg + RQUOTE + " failed to parse") {}
   };
 
   class Option_required_exception : public OptionParseException {
   public:
     Option_required_exception(const std::string& option)
         : OptionParseException("Option " + LQUOTE + option + RQUOTE + " is required but not present") {}
   };
 
   namespace values {
     namespace {
       std::basic_regex<char> integer_pattern("(-)?(0x)?([0-9a-zA-Z]+)|((0x)?0)");
       std::basic_regex<char> truthy_pattern("(t|T)(rue)?");
       std::basic_regex<char> falsy_pattern("((f|F)(alse)?)?");
     }  // namespace
 
     namespace detail {
       template <typename T, bool B>
       struct SignedCheck;
 
       template <typename T>
       struct SignedCheck<T, true> {
         template <typename U>
         void operator()(bool negative, U u, const std::string& text) {
           if (negative) {
             if (u > static_cast<U>(-(std::numeric_limits<T>::min)())) {
               throw Argument_incorrect_type(text);
             }
           } else {
             if (u > static_cast<U>((std::numeric_limits<T>::max)())) {
               throw Argument_incorrect_type(text);
             }
           }
         }
       };
 
       template <typename T>
       struct SignedCheck<T, false> {
         template <typename U>
         void operator()(bool, U, const std::string&) {}
       };
 
       template <typename T, typename U>
       void check_signed_range(bool negative, U value, const std::string& text) {
         SignedCheck<T, std::numeric_limits<T>::is_signed>()(negative, value, text);
       }
     }  // namespace detail
 
     template <typename R, typename T>
     R checked_negate(T&& t, const std::string&, std::true_type) {
       // if we got to here, then `t` is a positive number that fits into
       // `R`. So to avoid MSVC C4146, we first cast it to `R`.
       // See https://github.com/jarro2783/cxxopts/issues/62 for more details.
       return -static_cast<R>(t);
     }
 
     template <typename R, typename T>
     T checked_negate(T&&, const std::string& text, std::false_type) {
       throw Argument_incorrect_type(text);
     }
 
     template <typename T>
     void integer_parser(const std::string& text, T& value) {
       std::smatch match;
       std::regex_match(text, match, integer_pattern);
 
       if (match.length() == 0) {
         throw Argument_incorrect_type(text);
       }
 
       if (match.length(4) > 0) {
         value = 0;
         return;
       }
 
       using US = typename std::make_unsigned<T>::type;
 
       constexpr auto umax = (std::numeric_limits<US>::max)();
       constexpr bool is_signed = std::numeric_limits<T>::is_signed;
       const bool negative = match.length(1) > 0;
       const uint8_t base = match.length(2) > 0 ? 16 : 10;
 
       auto value_match = match[3];
 
       US result = 0;
 
       for (auto iter = value_match.first; iter != value_match.second; ++iter) {
         US digit = 0;
 
         if (*iter >= '0' && *iter <= '9') {
           digit = *iter - '0';
         } else if (base == 16 && *iter >= 'a' && *iter <= 'f') {
           digit = *iter - 'a' + 10;
         } else if (base == 16 && *iter >= 'A' && *iter <= 'F') {
           digit = *iter - 'A' + 10;
         } else {
           throw Argument_incorrect_type(text);
         }
 
         if (umax - digit < result * base) {
           throw Argument_incorrect_type(text);
         }
 
         result = result * base + digit;
       }
 
       detail::check_signed_range<T>(negative, result, text);
 
       if (negative) {
         value = checked_negate<T>(result, text, std::integral_constant<bool, is_signed>());
       } else {
         value = result;
       }
     }
 
     template <typename T>
     void stringstream_parser(const std::string& text, T& value) {
       std::stringstream in(text);
       in >> value;
       if (!in) {
         throw Argument_incorrect_type(text);
       }
     }
 
     inline void parse_value(const std::string& text, uint8_t& value) { integer_parser(text, value); }
 
     inline void parse_value(const std::string& text, int8_t& value) { integer_parser(text, value); }
 
     inline void parse_value(const std::string& text, uint16_t& value) { integer_parser(text, value); }
 
     inline void parse_value(const std::string& text, int16_t& value) { integer_parser(text, value); }
 
     inline void parse_value(const std::string& text, uint32_t& value) { integer_parser(text, value); }
 
     inline void parse_value(const std::string& text, int32_t& value) { integer_parser(text, value); }
 
     inline void parse_value(const std::string& text, uint64_t& value) { integer_parser(text, value); }
 
     inline void parse_value(const std::string& text, int64_t& value) { integer_parser(text, value); }
 
     inline void parse_value(const std::string& text, bool& value) {
       std::smatch result;
       std::regex_match(text, result, truthy_pattern);
 
       if (!result.empty()) {
         value = true;
         return;
       }
 
       std::regex_match(text, result, falsy_pattern);
       if (!result.empty()) {
         value = false;
         return;
       }
 
       throw Argument_incorrect_type(text);
     }
 
     inline void parse_value(const std::string& text, std::string& value) { value = text; }
 
     // The fallback parser. It uses the stringstream parser to parse all types
     // that have not been overloaded explicitly.  It has to be placed in the
     // source code before all other more specialized templates.
     template <typename T>
     void parse_value(const std::string& text, T& value) {
       stringstream_parser(text, value);
     }
 
     template <typename T>
     void parse_value(const std::string& text, std::vector<T>& value) {
       T v;
       parse_value(text, v);
       value.push_back(v);
     }
 
 #ifdef CXXOPTS_HAS_OPTIONAL
     template <typename T>
     void parse_value(const std::string& text, std::optional<T>& value) {
       T result;
       parse_value(text, result);
       value = std::move(result);
     }
 #endif
 
     template <typename T>
     struct Type_is_container {
       static constexpr bool value = false;
     };
 
     template <typename T>
     struct Type_is_container<std::vector<T>> {
       static constexpr bool value = true;
     };
 
     template <typename T>
     class Abstract_value : public Value {
       using Self = Abstract_value<T>;
 
     public:
       Abstract_value() : m_result(std::make_shared<T>()), m_store(m_result.get()) {}
 
       Abstract_value(T* t) : m_store(t) {}
 
       virtual ~Abstract_value() = default;
 
       Abstract_value(const Abstract_value& rhs) {
         if (rhs.m_result) {
           m_result = std::make_shared<T>();
           m_store = m_result.get();
         } else {
           m_store = rhs.m_store;
         }
 
         m_default = rhs.m_default;
         m_implicit = rhs.m_implicit;
         m_default_value = rhs.m_default_value;
         m_implicit_value = rhs.m_implicit_value;
       }
 
       void parse(const std::string& text) const { parse_value(text, *m_store); }
 
       bool is_container() const { return Type_is_container<T>::value; }
 
       void parse() const { parse_value(m_default_value, *m_store); }
 
       bool has_default() const { return m_default; }
 
       bool has_implicit() const { return m_implicit; }
 
       std::shared_ptr<Value> default_value(const std::string& value) {
         m_default = true;
         m_default_value = value;
         return shared_from_this();
       }
 
       std::shared_ptr<Value> implicit_value(const std::string& value) {
         m_implicit = true;
         m_implicit_value = value;
         return shared_from_this();
       }
 
       std::string get_default_value() const { return m_default_value; }
 
       std::string get_implicit_value() const { return m_implicit_value; }
 
       bool is_boolean() const { return std::is_same<T, bool>::value; }
 
       const T& get() const {
         if (m_store == nullptr) {
           return *m_result;
         } else {
           return *m_store;
         }
       }
 
     protected:
       std::shared_ptr<T> m_result;
       T* m_store;
 
       bool m_default = false;
       bool m_implicit = false;
 
       std::string m_default_value;
       std::string m_implicit_value;
     };
 
     template <typename T>
     class Standard_value : public Abstract_value<T> {
     public:
       using Abstract_value<T>::Abstract_value;
 
       std::shared_ptr<Value> clone() const { return std::make_shared<Standard_value<T>>(*this); }
     };
 
     template <>
     class Standard_value<bool> : public Abstract_value<bool> {
     public:
       ~Standard_value() = default;
 
       Standard_value() { set_default_and_implicit(); }
 
       Standard_value(bool* b) : Abstract_value(b) { set_default_and_implicit(); }
 
       std::shared_ptr<Value> clone() const { return std::make_shared<Standard_value<bool>>(*this); }
 
     private:
       void set_default_and_implicit() {
         m_default = true;
         m_default_value = "false";
         m_implicit = true;
         m_implicit_value = "true";
       }
     };
   }  // namespace values
 
   template <typename T>
   std::shared_ptr<Value> value() {
     return std::make_shared<values::Standard_value<T>>();
   }
 
   template <typename T>
   std::shared_ptr<Value> value(T& t) {
     return std::make_shared<values::Standard_value<T>>(&t);
   }
 
   class OptionAdder;
 
   class OptionDetails {
   public:
     OptionDetails(const std::string& short_,
                   const std::string& long_,
                   const String& desc,
                   std::shared_ptr<const Value> val)
         : m_short(short_), m_long(long_), m_desc(desc), m_value(val), m_count(0) {}
 
     OptionDetails(const OptionDetails& rhs) : m_desc(rhs.m_desc), m_count(rhs.m_count) {
       m_value = rhs.m_value->clone();
     }
 
     OptionDetails(OptionDetails&& rhs) = default;
 
     const String& description() const { return m_desc; }
 
     const Value& value() const { return *m_value; }
 
     std::shared_ptr<Value> make_storage() const { return m_value->clone(); }
 
     const std::string& short_name() const { return m_short; }
 
     const std::string& long_name() const { return m_long; }
 
   private:
     std::string m_short;
     std::string m_long;
     String m_desc;
     std::shared_ptr<const Value> m_value;
     int m_count;
   };
 
   struct HelpOptionDetails {
     std::string s;
     std::string l;
     String desc;
     bool has_default;
     std::string default_value;
     bool has_implicit;
     std::string implicit_value;
     std::string arg_help;
     bool is_container;
     bool is_boolean;
   };
 
   struct HelpGroupDetails {
     std::string name;
     std::string description;
     std::vector<HelpOptionDetails> options;
   };
 
   class OptionValue {
   public:
     void parse(std::shared_ptr<const OptionDetails> details, const std::string& text) {
       ensure_value(details);
       ++m_count;
       m_value->parse(text);
     }
 
     void parse_default(std::shared_ptr<const OptionDetails> details) {
       ensure_value(details);
       m_value->parse();
     }
 
     size_t count() const { return m_count; }
 
     template <typename T>
     const T& as() const {
       if (m_value == nullptr) {
         throw std::domain_error("No value");
       }
 
 #ifdef CXXOPTS_NO_RTTI
       return static_cast<const values::Standard_value<T>&>(*m_value).get();
 #else
       return dynamic_cast<const values::Standard_value<T>&>(*m_value).get();
 #endif
     }
 
   private:
     void ensure_value(std::shared_ptr<const OptionDetails> details) {
       if (m_value == nullptr) {
         m_value = details->make_storage();
       }
     }
 
     std::shared_ptr<Value> m_value;
     size_t m_count = 0;
   };
 
   class KeyValue {
   public:
     KeyValue(std::string key_, std::string value_) : m_key(std::move(key_)), m_value(std::move(value_)) {}
 
     const std::string& key() const { return m_key; }
 
     const std::string& value() const { return m_value; }
 
     template <typename T>
     T as() const {
       T result;
       values::parse_value(m_value, result);
       return result;
     }
 
   private:
     std::string m_key;
     std::string m_value;
   };
 
   class ParseResult {
   public:
     ParseResult(const std::shared_ptr<std::unordered_map<std::string, std::shared_ptr<OptionDetails>>>,
                 std::vector<std::string>,
                 bool allow_unrecognised,
                 int&,
                 char**&);
 
     size_t count(const std::string& o) const {
       auto iter = m_options->find(o);
       if (iter == m_options->end()) {
         return 0;
       }
 
       auto riter = m_results.find(iter->second);
 
       return riter->second.count();
     }
 
     const OptionValue& operator[](const std::string& option) const {
       auto iter = m_options->find(option);
 
       if (iter == m_options->end()) {
         throw Option_not_present_exception(option);
       }
 
       auto riter = m_results.find(iter->second);
 
       return riter->second;
     }
 
     const std::vector<KeyValue>& arguments() const { return m_sequential; }
 
   private:
     void parse(int& argc, char**& argv);
 
     void add_to_option(const std::string& option, const std::string& arg);
 
     bool consume_positional(std::string a);
 
     void parse_option(std::shared_ptr<OptionDetails> value, const std::string& name, const std::string& arg = "");
 
     void parse_default(std::shared_ptr<OptionDetails> details);
 
     void checked_parse_arg(
         int argc, char* argv[], int& current, std::shared_ptr<OptionDetails> value, const std::string& name);
 
     const std::shared_ptr<std::unordered_map<std::string, std::shared_ptr<OptionDetails>>> m_options;
     std::vector<std::string> m_positional;
     std::vector<std::string>::iterator m_next_positional;
     std::unordered_set<std::string> m_positional_set;
     std::unordered_map<std::shared_ptr<OptionDetails>, OptionValue> m_results;
 
     bool m_allow_unrecognised;
 
     std::vector<KeyValue> m_sequential;
   };
 
   class Options {
     typedef std::unordered_map<std::string, std::shared_ptr<OptionDetails>> OptionMap;
 
   public:
     Options(std::string program, std::string help_string = "")
         : m_program(std::move(program)),
           m_help_string(toLocalString(std::move(help_string))),
           m_custom_help("[OPTION...]"),
           m_positional_help("positional parameters"),
           m_show_positional(false),
           m_allow_unrecognised(false),
           m_options(std::make_shared<OptionMap>()),
           m_next_positional(m_positional.end()) {}
 
     Options& positional_help(std::string help_text) {
       m_positional_help = std::move(help_text);
       return *this;
     }
 
     Options& custom_help(std::string help_text) {
       m_custom_help = std::move(help_text);
       return *this;
     }
 
     Options& show_positional_help() {
       m_show_positional = true;
       return *this;
     }
 
     Options& allow_unrecognised_options() {
       m_allow_unrecognised = true;
       return *this;
     }
 
     ParseResult parse(int& argc, char**& argv);
 
     OptionAdder add_options(std::string group = "");
 
     void add_option(const std::string& group,
                     const std::string& s,
                     const std::string& l,
                     std::string desc,
                     std::shared_ptr<const Value> value,
                     std::string arg_help);
 
     //parse positional arguments into the given option
     void parse_positional(std::string option);
 
     void parse_positional(std::vector<std::string> options);
 
     void parse_positional(std::initializer_list<std::string> options);
 
     template <typename Iterator>
     void parse_positional(Iterator begin, Iterator end) {
       parse_positional(std::vector<std::string>{begin, end});
     }
 
     std::string help(const std::vector<std::string>& groups = {}) const;
 
     const std::vector<std::string> groups() const;
 
     const HelpGroupDetails& group_help(const std::string& group) const;
 
   private:
     void add_one_option(const std::string& option, std::shared_ptr<OptionDetails> details);
 
     String help_one_group(const std::string& group) const;
 
     void generate_group_help(String& result, const std::vector<std::string>& groups) const;
 
     void generate_all_groups_help(String& result) const;
 
     std::string m_program;
     String m_help_string;
     std::string m_custom_help;
     std::string m_positional_help;
     bool m_show_positional;
     bool m_allow_unrecognised;
 
     std::shared_ptr<OptionMap> m_options;
     std::vector<std::string> m_positional;
     std::vector<std::string>::iterator m_next_positional;
     std::unordered_set<std::string> m_positional_set;
 
     //mapping from groups to help options
     std::map<std::string, HelpGroupDetails> m_help;
   };
 
   class OptionAdder {
   public:
     OptionAdder(Options& options, std::string group) : m_options(options), m_group(std::move(group)) {}
 
     OptionAdder& operator()(const std::string& opts,
                             const std::string& desc,
                             std::shared_ptr<const Value> value = ::cxxopts::value<bool>(),
                             std::string arg_help = "");
 
   private:
     Options& m_options;
     std::string m_group;
   };
 
   namespace {
     constexpr int OPTION_LONGEST = 30;
     constexpr int OPTION_DESC_GAP = 2;
 
     std::basic_regex<char> option_matcher("--([[:alnum:]][-_[:alnum:]]+)(=(.*))?|-([[:alnum:]]+)");
 
     std::basic_regex<char> option_specifier("(([[:alnum:]]),)?[ ]*([[:alnum:]][-_[:alnum:]]*)?");
 
     String format_option(const HelpOptionDetails& o) {
       auto& s = o.s;
       auto& l = o.l;
 
       String result = "  ";
 
       if (s.size() > 0) {
         result += "-" + toLocalString(s) + ",";
       } else {
         result += "   ";
       }
 
       if (l.size() > 0) {
         result += " --" + toLocalString(l);
       }
 
       auto arg = o.arg_help.size() > 0 ? toLocalString(o.arg_help) : "arg";
 
       if (!o.is_boolean) {
         if (o.has_implicit) {
           result += " [=" + arg + "(=" + toLocalString(o.implicit_value) + ")]";
         } else {
           result += " " + arg;
         }
       }
 
       return result;
     }
 
     String format_description(const HelpOptionDetails& o, size_t start, size_t width) {
       auto desc = o.desc;
 
       if (o.has_default && (!o.is_boolean || o.default_value != "false")) {
         desc += toLocalString(" (default: " + o.default_value + ")");
       }
 
       String result;
 
       auto current = std::begin(desc);
       auto startLine = current;
       auto lastSpace = current;
 
       auto size = size_t{};
 
       while (current != std::end(desc)) {
         if (*current == ' ') {
           lastSpace = current;
         }
 
         if (*current == '\n') {
           startLine = current + 1;
           lastSpace = startLine;
         } else if (size > width) {
           if (lastSpace == startLine) {
             stringAppend(result, startLine, current + 1);
             stringAppend(result, "\n");
             stringAppend(result, start, ' ');
             startLine = current + 1;
             lastSpace = startLine;
           } else {
             stringAppend(result, startLine, lastSpace);
             stringAppend(result, "\n");
             stringAppend(result, start, ' ');
             startLine = lastSpace + 1;
           }
           size = 0;
         } else {
           ++size;
         }
 
         ++current;
       }
 
       //append whatever is left
       stringAppend(result, startLine, current);
 
       return result;
     }
   }  // namespace
 
   inline ParseResult::ParseResult(
       const std::shared_ptr<std::unordered_map<std::string, std::shared_ptr<OptionDetails>>> options,
       std::vector<std::string> positional,
       bool allow_unrecognised,
       int& argc,
       char**& argv)
       : m_options(options),
         m_positional(std::move(positional)),
         m_next_positional(m_positional.begin()),
         m_allow_unrecognised(allow_unrecognised) {
     parse(argc, argv);
   }
 
   inline OptionAdder Options::add_options(std::string group) { return OptionAdder(*this, std::move(group)); }
 
   inline OptionAdder& OptionAdder::operator()(const std::string& opts,
                                               const std::string& desc,
                                               std::shared_ptr<const Value> value,
                                               std::string arg_help) {
     std::match_results<const char*> result;
     std::regex_match(opts.c_str(), result, option_specifier);
 
     if (result.empty()) {
       throw Invalid_option_format_error(opts);
     }
 
     const auto& short_match = result[2];
     const auto& long_match = result[3];
 
     if (!short_match.length() && !long_match.length()) {
       throw Invalid_option_format_error(opts);
     } else if (long_match.length() == 1 && short_match.length()) {
       throw Invalid_option_format_error(opts);
     }
 
     auto option_names = [](const std::sub_match<const char*>& short_, const std::sub_match<const char*>& long_) {
       if (long_.length() == 1) {
         return std::make_tuple(long_.str(), short_.str());
       } else {
         return std::make_tuple(short_.str(), long_.str());
       }
     }(short_match, long_match);
 
     m_options.add_option(
         m_group, std::get<0>(option_names), std::get<1>(option_names), desc, value, std::move(arg_help));
 
     return *this;
   }
 
   inline void ParseResult::parse_default(std::shared_ptr<OptionDetails> details) {
     m_results[details].parse_default(details);
   }
 
   inline void ParseResult::parse_option(std::shared_ptr<OptionDetails> value,
                                         const std::string& /*name*/,
                                         const std::string& arg) {
     auto& result = m_results[value];
     result.parse(value, arg);
 
     m_sequential.emplace_back(value->long_name(), arg);
   }
 
   inline void ParseResult::checked_parse_arg(
       int argc, char* argv[], int& current, std::shared_ptr<OptionDetails> value, const std::string& name) {
     if (current + 1 >= argc) {
       if (value->value().has_implicit()) {
         parse_option(value, name, value->value().get_implicit_value());
       } else {
         throw Missing_argument_exception(name);
       }
     } else {
       if (value->value().has_implicit()) {
         parse_option(value, name, value->value().get_implicit_value());
       } else {
         parse_option(value, name, argv[current + 1]);
         ++current;
       }
     }
   }
 
   inline void ParseResult::add_to_option(const std::string& option, const std::string& arg) {
     auto iter = m_options->find(option);
 
     if (iter == m_options->end()) {
       throw Option_not_exists_exception(option);
     }
 
     parse_option(iter->second, option, arg);
   }
 
   inline bool ParseResult::consume_positional(std::string a) {
     while (m_next_positional != m_positional.end()) {
       auto iter = m_options->find(*m_next_positional);
       if (iter != m_options->end()) {
         auto& result = m_results[iter->second];
         if (!iter->second->value().is_container()) {
           if (result.count() == 0) {
             add_to_option(*m_next_positional, a);
             ++m_next_positional;
             return true;
           } else {
             ++m_next_positional;
             continue;
           }
         } else {
           add_to_option(*m_next_positional, a);
           return true;
         }
       }
       ++m_next_positional;
     }
 
     return false;
   }
 
   inline void Options::parse_positional(std::string option) {
     parse_positional(std::vector<std::string>{std::move(option)});
   }
 
   inline void Options::parse_positional(std::vector<std::string> options) {
     m_positional = std::move(options);
     m_next_positional = m_positional.begin();
 
     m_positional_set.insert(m_positional.begin(), m_positional.end());
   }
 
   inline void Options::parse_positional(std::initializer_list<std::string> options) {
     parse_positional(std::vector<std::string>(std::move(options)));
   }
 
   inline ParseResult Options::parse(int& argc, char**& argv) {
     ParseResult result(m_options, m_positional, m_allow_unrecognised, argc, argv);
     return result;
   }
 
   inline void ParseResult::parse(int& argc, char**& argv) {
     int current = 1;
 
     int nextKeep = 1;
 
     bool consume_remaining = false;
 
     while (current != argc) {
       if (strcmp(argv[current], "--") == 0) {
         consume_remaining = true;
         ++current;
         break;
       }
 
       std::match_results<const char*> result;
       std::regex_match(argv[current], result, option_matcher);
 
       if (result.empty()) {
         //not a flag
 
         // but if it starts with a `-`, then it's an error
         if (argv[current][0] == '-' && argv[current][1] != '\0') {
           throw Option_syntax_exception(argv[current]);
         }
 
         //if true is returned here then it was consumed, otherwise it is
         //ignored
         if (consume_positional(argv[current])) {
         } else {
           argv[nextKeep] = argv[current];
           ++nextKeep;
         }
         //if we return from here then it was parsed successfully, so continue
       } else {
         //short or long option?
         if (result[4].length() != 0) {
           const std::string& s = result[4];
 
           for (std::size_t i = 0; i != s.size(); ++i) {
             std::string name(1, s[i]);
             auto iter = m_options->find(name);
 
             if (iter == m_options->end()) {
               if (m_allow_unrecognised) {
                 continue;
               } else {
                 //error
                 throw Option_not_exists_exception(name);
               }
             }
 
             auto value = iter->second;
 
             if (i + 1 == s.size()) {
               //it must be the last argument
               checked_parse_arg(argc, argv, current, value, name);
             } else if (value->value().has_implicit()) {
               parse_option(value, name, value->value().get_implicit_value());
             } else {
               //error
               throw Option_requires_argument_exception(name);
             }
           }
         } else if (result[1].length() != 0) {
           const std::string& name = result[1];
 
           auto iter = m_options->find(name);
 
           if (iter == m_options->end()) {
             if (m_allow_unrecognised) {
               // keep unrecognised options in argument list, skip to next argument
               argv[nextKeep] = argv[current];
               ++nextKeep;
               ++current;
               continue;
             } else {
               //error
               throw Option_not_exists_exception(name);
             }
           }
 
           auto opt = iter->second;
 
           //equals provided for long option?
           if (result[2].length() != 0) {
             //parse the option given
 
             parse_option(opt, name, result[3]);
           } else {
             //parse the next argument
             checked_parse_arg(argc, argv, current, opt, name);
           }
         }
       }
 
       ++current;
     }
 
     for (auto& opt : *m_options) {
       auto& detail = opt.second;
       auto& value = detail->value();
 
       auto& store = m_results[detail];
 
       if (!store.count() && value.has_default()) {
         parse_default(detail);
       }
     }
 
     if (consume_remaining) {
       while (current < argc) {
         if (!consume_positional(argv[current])) {
           break;
         }
         ++current;
       }
 
       //adjust argv for any that couldn't be swallowed
       while (current != argc) {
         argv[nextKeep] = argv[current];
         ++nextKeep;
         ++current;
       }
     }
 
     argc = nextKeep;
   }
 
   inline void Options::add_option(const std::string& group,
                                   const std::string& s,
                                   const std::string& l,
                                   std::string desc,
                                   std::shared_ptr<const Value> value,
                                   std::string arg_help) {
     auto stringDesc = toLocalString(std::move(desc));
     auto option = std::make_shared<OptionDetails>(s, l, stringDesc, value);
 
     if (s.size() > 0) {
       add_one_option(s, option);
     }
 
     if (l.size() > 0) {
       add_one_option(l, option);
     }
 
     //add the help details
     auto& options = m_help[group];
 
     options.options.emplace_back(HelpOptionDetails{s,
                                                    l,
                                                    stringDesc,
                                                    value->has_default(),
                                                    value->get_default_value(),
                                                    value->has_implicit(),
                                                    value->get_implicit_value(),
                                                    std::move(arg_help),
                                                    value->is_container(),
                                                    value->is_boolean()});
   }
 
   inline void Options::add_one_option(const std::string& option, std::shared_ptr<OptionDetails> details) {
     auto in = m_options->emplace(option, details);
 
     if (!in.second) {
       throw Option_exists_error(option);
     }
   }
 
   inline String Options::help_one_group(const std::string& g) const {
     typedef std::vector<std::pair<String, String>> OptionHelp;
 
     auto group = m_help.find(g);
     if (group == m_help.end()) {
       return "";
     }
 
     OptionHelp format;
 
     size_t longest = 0;
 
     String result;
 
     if (!g.empty()) {
       result += toLocalString(" " + g + " options:\n");
     }
 
     for (const auto& o : group->second.options) {
       if (o.is_container && m_positional_set.find(o.l) != m_positional_set.end() && !m_show_positional) {
         continue;
       }
 
       auto s = format_option(o);
       longest = (std::max)(longest, stringLength(s));
       format.push_back(std::make_pair(s, String()));
     }
 
     longest = (std::min)(longest, static_cast<size_t>(OPTION_LONGEST));
 
     //widest allowed description
     auto allowed = size_t{76} - longest - OPTION_DESC_GAP;
 
     auto fiter = format.begin();
     for (const auto& o : group->second.options) {
       if (o.is_container && m_positional_set.find(o.l) != m_positional_set.end() && !m_show_positional) {
         continue;
       }
 
       auto d = format_description(o, longest + OPTION_DESC_GAP, allowed);
 
       result += fiter->first;
       if (stringLength(fiter->first) > longest) {
         result += '\n';
         result += toLocalString(std::string(longest + OPTION_DESC_GAP, ' '));
       } else {
         result += toLocalString(std::string(longest + OPTION_DESC_GAP - stringLength(fiter->first), ' '));
       }
       result += d;
       result += '\n';
 
       ++fiter;
     }
 
     return result;
   }
 
   inline void Options::generate_group_help(String& result, const std::vector<std::string>& print_groups) const {
     for (size_t i = 0; i != print_groups.size(); ++i) {
       const String& group_help_text = help_one_group(print_groups[i]);
       if (empty(group_help_text)) {
         continue;
       }
       result += group_help_text;
       if (i < print_groups.size() - 1) {
         result += '\n';
       }
     }
   }
 
   inline void Options::generate_all_groups_help(String& result) const {
     std::vector<std::string> all_groups;
     all_groups.reserve(m_help.size());
 
     for (auto& group : m_help) {
       all_groups.push_back(group.first);
     }
 
     generate_group_help(result, all_groups);
   }
 
   inline std::string Options::help(const std::vector<std::string>& help_groups) const {
     String result = m_help_string + "\nUsage:\n  " + toLocalString(m_program) + " " + toLocalString(m_custom_help);
 
     if (m_positional.size() > 0 && m_positional_help.size() > 0) {
       result += " " + toLocalString(m_positional_help);
     }
 
     result += "\n\n";
 
     if (help_groups.size() == 0) {
       generate_all_groups_help(result);
     } else {
       generate_group_help(result, help_groups);
     }
 
     return toUTF8String(result);
   }
 
   inline const std::vector<std::string> Options::groups() const {
     std::vector<std::string> g;
 
     std::transform(m_help.begin(),
                    m_help.end(),
                    std::back_inserter(g),
                    [](const std::map<std::string, HelpGroupDetails>::value_type& pair) { return pair.first; });
 
     return g;
   }
 
   inline const HelpGroupDetails& Options::group_help(const std::string& group) const { return m_help.at(group); }
 
 }  // namespace cxxopts
 
 #endif  //CXXOPTS_HPP_INCLUDED

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