diff --git a/include/ALabel.hpp b/include/ALabel.hpp
index 6befe03b..139bef58 100644
--- a/include/ALabel.hpp
+++ b/include/ALabel.hpp
@@ -6,26 +6,26 @@
 namespace waybar {
 
 class ALabel : public IModule {
- public:
-  ALabel(const Json::Value&, const std::string format, uint16_t interval = 0);
+public:
+  ALabel(const Json::Value &, const std::string format, uint16_t interval = 0);
   virtual ~ALabel() = default;
   virtual auto update() -> void;
-  virtual std::string getIcon(uint16_t, const std::string& alt = "");
-  virtual operator Gtk::Widget&();
+  virtual std::string getIcon(uint16_t, const std::string &alt = "");
+  virtual operator Gtk::Widget &();
 
- protected:
+protected:
   Gtk::EventBox event_box_;
   Gtk::Label label_;
-  const Json::Value& config_;
+  const Json::Value &config_;
   std::string format_;
   std::mutex mutex_;
   const std::chrono::seconds interval_;
 
- private:
-  bool handleToggle(GdkEventButton* const& ev);
-  bool handleScroll(GdkEventScroll*);
+private:
+  bool handleToggle(GdkEventButton *const &ev);
+  bool handleScroll(GdkEventScroll *);
   bool alt = false;
   const std::string default_format_;
 };
 
-}  // namespace waybar
+} // namespace waybar
diff --git a/include/client.hpp b/include/client.hpp
index f3ef1351..43947aa8 100644
--- a/include/client.hpp
+++ b/include/client.hpp
@@ -15,7 +15,7 @@ class Client {
     Client(int argc, char *argv[]);
     int main(int argc, char *argv[]);
 
-    Glib::RefPtr<Gtk::Application> gtk_app;
+    Gtk::Main gtk_main;
     std::string css_file;
     std::string config_file;
     Glib::RefPtr<Gdk::Display> gdk_display;
@@ -27,8 +27,8 @@ class Client {
     std::vector<std::unique_ptr<Bar>> bars;
 
   private:
+    void setupConfigs(const std::string& config, const std::string& style);
     void bindInterfaces();
-    auto setupCss();
     const std::string getValidPath(std::vector<std::string> paths);
 
     static void handleGlobal(void *data, struct wl_registry *registry,
diff --git a/include/modules/battery.hpp b/include/modules/battery.hpp
index c3eadba6..9d6e54a4 100644
--- a/include/modules/battery.hpp
+++ b/include/modules/battery.hpp
@@ -23,7 +23,7 @@ namespace fs = std::filesystem;
 
 class Battery : public ALabel {
   public:
-    Battery(const Json::Value&);
+    Battery(const std::string&, const Json::Value&);
     ~Battery();
     auto update() -> void;
   private:
diff --git a/include/modules/clock.hpp b/include/modules/clock.hpp
index fba52cd2..687f3feb 100644
--- a/include/modules/clock.hpp
+++ b/include/modules/clock.hpp
@@ -9,7 +9,7 @@ namespace waybar::modules {
 
 class Clock : public ALabel {
   public:
-    Clock(const Json::Value&);
+    Clock(const std::string&, const Json::Value&);
     auto update() -> void;
   private:
     waybar::util::SleeperThread thread_;
diff --git a/include/modules/cpu.hpp b/include/modules/cpu.hpp
index a371c323..35c00177 100644
--- a/include/modules/cpu.hpp
+++ b/include/modules/cpu.hpp
@@ -13,7 +13,7 @@ namespace waybar::modules {
 
 class Cpu : public ALabel {
   public:
-    Cpu(const Json::Value&);
+    Cpu(const std::string&, const Json::Value&);
     auto update() -> void;
   private:
     static inline const std::string data_dir_ = "/proc/stat";
diff --git a/include/modules/custom.hpp b/include/modules/custom.hpp
index 40ff5f29..937ab76f 100644
--- a/include/modules/custom.hpp
+++ b/include/modules/custom.hpp
@@ -11,7 +11,7 @@ namespace waybar::modules {
 
 class Custom : public ALabel {
   public:
-    Custom(const std::string, const Json::Value&);
+    Custom(const std::string&, const Json::Value&);
     ~Custom();
     auto update() -> void;
   private:
diff --git a/include/modules/memory.hpp b/include/modules/memory.hpp
index 0172f019..bb138d03 100644
--- a/include/modules/memory.hpp
+++ b/include/modules/memory.hpp
@@ -9,7 +9,7 @@ namespace waybar::modules {
 
 class Memory : public ALabel {
   public:
-    Memory(const Json::Value&);
+    Memory(const std::string&, const Json::Value&);
     auto update() -> void;
   private:
     static inline const std::string data_dir_ = "/proc/meminfo";
diff --git a/include/modules/network.hpp b/include/modules/network.hpp
index c120846d..2f20e180 100644
--- a/include/modules/network.hpp
+++ b/include/modules/network.hpp
@@ -15,7 +15,7 @@ namespace waybar::modules {
 
 class Network : public ALabel {
   public:
-    Network(const Json::Value&);
+    Network(const std::string&, const Json::Value&);
     ~Network();
     auto update() -> void;
   private:
diff --git a/include/modules/pulseaudio.hpp b/include/modules/pulseaudio.hpp
index c4100fba..4864533d 100644
--- a/include/modules/pulseaudio.hpp
+++ b/include/modules/pulseaudio.hpp
@@ -10,7 +10,7 @@ namespace waybar::modules {
 
 class Pulseaudio : public ALabel {
   public:
-    Pulseaudio(const Json::Value&);
+    Pulseaudio(const std::string&, const Json::Value&);
     ~Pulseaudio();
     auto update() -> void;
   private:
diff --git a/include/modules/sni/tray.hpp b/include/modules/sni/tray.hpp
index 2f79f927..9ee0c9e7 100644
--- a/include/modules/sni/tray.hpp
+++ b/include/modules/sni/tray.hpp
@@ -12,7 +12,7 @@ namespace waybar::modules::SNI {
 
 class Tray : public IModule {
   public:
-    Tray(const Json::Value&);
+    Tray(const std::string&, const Json::Value&);
     auto update() -> void;
     operator Gtk::Widget &();
   private:
diff --git a/include/modules/sway/mode.hpp b/include/modules/sway/mode.hpp
index b825f018..51bb086f 100644
--- a/include/modules/sway/mode.hpp
+++ b/include/modules/sway/mode.hpp
@@ -12,7 +12,7 @@ namespace waybar::modules::sway {
 
 class Mode : public ALabel {
   public:
-    Mode(const waybar::Bar&, const Json::Value&);
+    Mode(const std::string&, const waybar::Bar&, const Json::Value&);
     auto update() -> void;
   private:
     void worker();
diff --git a/include/modules/sway/window.hpp b/include/modules/sway/window.hpp
index 94c568bb..8cf11b3e 100644
--- a/include/modules/sway/window.hpp
+++ b/include/modules/sway/window.hpp
@@ -13,7 +13,7 @@ namespace waybar::modules::sway {
 
 class Window : public ALabel {
   public:
-    Window(const waybar::Bar&, const Json::Value&);
+    Window(const std::string&, const waybar::Bar&, const Json::Value&);
     auto update() -> void;
   private:
     void worker();
diff --git a/include/modules/sway/workspaces.hpp b/include/modules/sway/workspaces.hpp
index a8208774..d4819e52 100644
--- a/include/modules/sway/workspaces.hpp
+++ b/include/modules/sway/workspaces.hpp
@@ -12,7 +12,7 @@ namespace waybar::modules::sway {
 
 class Workspaces : public IModule {
   public:
-    Workspaces(const waybar::Bar&, const Json::Value&);
+    Workspaces(const std::string&, const waybar::Bar&, const Json::Value&);
     auto update() -> void;
     operator Gtk::Widget &();
   private:
diff --git a/include/util/chrono.hpp b/include/util/chrono.hpp
index fdca5f47..33bc0ef7 100644
--- a/include/util/chrono.hpp
+++ b/include/util/chrono.hpp
@@ -63,14 +63,14 @@ struct SleeperThread {
   {
     do_run_ = false;
     condvar_.notify_all();
-    if (thread_.joinable()) {
-      thread_.detach();
-    }
   }
 
   ~SleeperThread()
   {
     stop();
+    if (thread_.joinable()) {
+      thread_.detach();
+    }
   }
 
 private:
diff --git a/include/util/clara.hpp b/include/util/clara.hpp
new file mode 100644
index 00000000..6be5a98b
--- /dev/null
+++ b/include/util/clara.hpp
@@ -0,0 +1,1264 @@
+// Copyright 2017 Two Blue Cubes Ltd. All rights reserved.
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// See https://github.com/philsquared/Clara for more details
+
+// Clara v1.1.5
+
+#ifndef CLARA_HPP_INCLUDED
+#define CLARA_HPP_INCLUDED
+
+#ifndef CLARA_CONFIG_CONSOLE_WIDTH
+#define CLARA_CONFIG_CONSOLE_WIDTH 80
+#endif
+
+#ifndef CLARA_TEXTFLOW_CONFIG_CONSOLE_WIDTH
+#define CLARA_TEXTFLOW_CONFIG_CONSOLE_WIDTH CLARA_CONFIG_CONSOLE_WIDTH
+#endif
+
+#ifndef CLARA_CONFIG_OPTIONAL_TYPE
+#ifdef __has_include
+#if __has_include(<optional>) && __cplusplus >= 201703L
+#include <optional>
+#define CLARA_CONFIG_OPTIONAL_TYPE std::optional
+#endif
+#endif
+#endif
+
+
+// ----------- #included from clara_textflow.hpp -----------
+
+// TextFlowCpp
+//
+// A single-header library for wrapping and laying out basic text, by Phil Nash
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// This project is hosted at https://github.com/philsquared/textflowcpp
+
+#ifndef CLARA_TEXTFLOW_HPP_INCLUDED
+#define CLARA_TEXTFLOW_HPP_INCLUDED
+
+#include <cassert>
+#include <ostream>
+#include <sstream>
+#include <vector>
+
+#ifndef CLARA_TEXTFLOW_CONFIG_CONSOLE_WIDTH
+#define CLARA_TEXTFLOW_CONFIG_CONSOLE_WIDTH 80
+#endif
+
+
+namespace clara { namespace TextFlow {
+
+    inline auto isWhitespace( char c ) -> bool {
+        static std::string chars = " \t\n\r";
+        return chars.find( c ) != std::string::npos;
+    }
+    inline auto isBreakableBefore( char c ) -> bool {
+        static std::string chars = "[({<|";
+        return chars.find( c ) != std::string::npos;
+    }
+    inline auto isBreakableAfter( char c ) -> bool {
+        static std::string chars = "])}>.,:;*+-=&/\\";
+        return chars.find( c ) != std::string::npos;
+    }
+
+    class Columns;
+
+    class Column {
+        std::vector<std::string> m_strings;
+        size_t m_width = CLARA_TEXTFLOW_CONFIG_CONSOLE_WIDTH;
+        size_t m_indent = 0;
+        size_t m_initialIndent = std::string::npos;
+
+    public:
+        class iterator {
+            friend Column;
+
+            Column const& m_column;
+            size_t m_stringIndex = 0;
+            size_t m_pos = 0;
+
+            size_t m_len = 0;
+            size_t m_end = 0;
+            bool m_suffix = false;
+
+            iterator( Column const& column, size_t stringIndex )
+            :   m_column( column ),
+                m_stringIndex( stringIndex )
+            {}
+
+            auto line() const -> std::string const& { return m_column.m_strings[m_stringIndex]; }
+
+            auto isBoundary( size_t at ) const -> bool {
+                assert( at > 0 );
+                assert( at <= line().size() );
+
+                return at == line().size() ||
+                       ( isWhitespace( line()[at] ) && !isWhitespace( line()[at-1] ) ) ||
+                       isBreakableBefore( line()[at] ) ||
+                       isBreakableAfter( line()[at-1] );
+            }
+
+            void calcLength() {
+                assert( m_stringIndex < m_column.m_strings.size() );
+
+                m_suffix = false;
+                auto width = m_column.m_width-indent();
+                m_end = m_pos;
+                while( m_end < line().size() && line()[m_end] != '\n' )
+                    ++m_end;
+
+                if( m_end < m_pos + width ) {
+                    m_len = m_end - m_pos;
+                }
+                else {
+                    size_t len = width;
+                    while (len > 0 && !isBoundary(m_pos + len))
+                        --len;
+                    while (len > 0 && isWhitespace( line()[m_pos + len - 1] ))
+                        --len;
+
+                    if (len > 0) {
+                        m_len = len;
+                    } else {
+                        m_suffix = true;
+                        m_len = width - 1;
+                    }
+                }
+            }
+
+            auto indent() const -> size_t {
+                auto initial = m_pos == 0 && m_stringIndex == 0 ? m_column.m_initialIndent : std::string::npos;
+                return initial == std::string::npos ? m_column.m_indent : initial;
+            }
+
+            auto addIndentAndSuffix(std::string const &plain) const -> std::string {
+                return std::string( indent(), ' ' ) + (m_suffix ? plain + "-" : plain);
+            }
+
+        public:
+            using difference_type = std::ptrdiff_t;
+            using value_type = std::string;
+            using pointer = value_type*;
+            using reference = value_type&;
+            using iterator_category = std::forward_iterator_tag;
+
+            explicit iterator( Column const& column ) : m_column( column ) {
+                assert( m_column.m_width > m_column.m_indent );
+                assert( m_column.m_initialIndent == std::string::npos || m_column.m_width > m_column.m_initialIndent );
+                calcLength();
+                if( m_len == 0 )
+                    m_stringIndex++; // Empty string
+            }
+
+            auto operator *() const -> std::string {
+                assert( m_stringIndex < m_column.m_strings.size() );
+                assert( m_pos <= m_end );
+                return addIndentAndSuffix(line().substr(m_pos, m_len));
+            }
+
+            auto operator ++() -> iterator& {
+                m_pos += m_len;
+                if( m_pos < line().size() && line()[m_pos] == '\n' )
+                    m_pos += 1;
+                else
+                    while( m_pos < line().size() && isWhitespace( line()[m_pos] ) )
+                        ++m_pos;
+
+                if( m_pos == line().size() ) {
+                    m_pos = 0;
+                    ++m_stringIndex;
+                }
+                if( m_stringIndex < m_column.m_strings.size() )
+                    calcLength();
+                return *this;
+            }
+            auto operator ++(int) -> iterator {
+                iterator prev( *this );
+                operator++();
+                return prev;
+            }
+
+            auto operator ==( iterator const& other ) const -> bool {
+                return
+                    m_pos == other.m_pos &&
+                    m_stringIndex == other.m_stringIndex &&
+                    &m_column == &other.m_column;
+            }
+            auto operator !=( iterator const& other ) const -> bool {
+                return !operator==( other );
+            }
+        };
+        using const_iterator = iterator;
+
+        explicit Column( std::string const& text ) { m_strings.push_back( text ); }
+
+        auto width( size_t newWidth ) -> Column& {
+            assert( newWidth > 0 );
+            m_width = newWidth;
+            return *this;
+        }
+        auto indent( size_t newIndent ) -> Column& {
+            m_indent = newIndent;
+            return *this;
+        }
+        auto initialIndent( size_t newIndent ) -> Column& {
+            m_initialIndent = newIndent;
+            return *this;
+        }
+
+        auto width() const -> size_t { return m_width; }
+        auto begin() const -> iterator { return iterator( *this ); }
+        auto end() const -> iterator { return { *this, m_strings.size() }; }
+
+        inline friend std::ostream& operator << ( std::ostream& os, Column const& col ) {
+            bool first = true;
+            for( auto line : col ) {
+                if( first )
+                    first = false;
+                else
+                    os << "\n";
+                os <<  line;
+            }
+            return os;
+        }
+
+        auto operator + ( Column const& other ) -> Columns;
+
+        auto toString() const -> std::string {
+            std::ostringstream oss;
+            oss << *this;
+            return oss.str();
+        }
+    };
+
+    class Spacer : public Column {
+
+    public:
+        explicit Spacer( size_t spaceWidth ) : Column( "" ) {
+            width( spaceWidth );
+        }
+    };
+
+    class Columns {
+        std::vector<Column> m_columns;
+
+    public:
+
+        class iterator {
+            friend Columns;
+            struct EndTag {};
+
+            std::vector<Column> const& m_columns;
+            std::vector<Column::iterator> m_iterators;
+            size_t m_activeIterators;
+
+            iterator( Columns const& columns, EndTag )
+            :   m_columns( columns.m_columns ),
+                m_activeIterators( 0 )
+            {
+                m_iterators.reserve( m_columns.size() );
+
+                for( auto const& col : m_columns )
+                    m_iterators.push_back( col.end() );
+            }
+
+        public:
+            using difference_type = std::ptrdiff_t;
+            using value_type = std::string;
+            using pointer = value_type*;
+            using reference = value_type&;
+            using iterator_category = std::forward_iterator_tag;
+
+            explicit iterator( Columns const& columns )
+            :   m_columns( columns.m_columns ),
+                m_activeIterators( m_columns.size() )
+            {
+                m_iterators.reserve( m_columns.size() );
+
+                for( auto const& col : m_columns )
+                    m_iterators.push_back( col.begin() );
+            }
+
+            auto operator ==( iterator const& other ) const -> bool {
+                return m_iterators == other.m_iterators;
+            }
+            auto operator !=( iterator const& other ) const -> bool {
+                return m_iterators != other.m_iterators;
+            }
+            auto operator *() const -> std::string {
+                std::string row, padding;
+
+                for( size_t i = 0; i < m_columns.size(); ++i ) {
+                    auto width = m_columns[i].width();
+                    if( m_iterators[i] != m_columns[i].end() ) {
+                        std::string col = *m_iterators[i];
+                        row += padding + col;
+                        if( col.size() < width )
+                            padding = std::string( width - col.size(), ' ' );
+                        else
+                            padding = "";
+                    }
+                    else {
+                        padding += std::string( width, ' ' );
+                    }
+                }
+                return row;
+            }
+            auto operator ++() -> iterator& {
+                for( size_t i = 0; i < m_columns.size(); ++i ) {
+                    if (m_iterators[i] != m_columns[i].end())
+                        ++m_iterators[i];
+                }
+                return *this;
+            }
+            auto operator ++(int) -> iterator {
+                iterator prev( *this );
+                operator++();
+                return prev;
+            }
+        };
+        using const_iterator = iterator;
+
+        auto begin() const -> iterator { return iterator( *this ); }
+        auto end() const -> iterator { return { *this, iterator::EndTag() }; }
+
+        auto operator += ( Column const& col ) -> Columns& {
+            m_columns.push_back( col );
+            return *this;
+        }
+        auto operator + ( Column const& col ) -> Columns {
+            Columns combined = *this;
+            combined += col;
+            return combined;
+        }
+
+        inline friend std::ostream& operator << ( std::ostream& os, Columns const& cols ) {
+
+            bool first = true;
+            for( auto line : cols ) {
+                if( first )
+                    first = false;
+                else
+                    os << "\n";
+                os << line;
+            }
+            return os;
+        }
+
+        auto toString() const -> std::string {
+            std::ostringstream oss;
+            oss << *this;
+            return oss.str();
+        }
+    };
+
+    inline auto Column::operator + ( Column const& other ) -> Columns {
+        Columns cols;
+        cols += *this;
+        cols += other;
+        return cols;
+    }
+}}
+
+#endif // CLARA_TEXTFLOW_HPP_INCLUDED
+
+// ----------- end of #include from clara_textflow.hpp -----------
+// ........... back in clara.hpp
+
+
+#include <memory>
+#include <set>
+#include <algorithm>
+
+#if !defined(CLARA_PLATFORM_WINDOWS) && ( defined(WIN32) || defined(__WIN32__) || defined(_WIN32) || defined(_MSC_VER) )
+#define CLARA_PLATFORM_WINDOWS
+#endif
+
+namespace clara {
+namespace detail {
+
+    // Traits for extracting arg and return type of lambdas (for single argument lambdas)
+    template<typename L>
+    struct UnaryLambdaTraits : UnaryLambdaTraits<decltype( &L::operator() )> {};
+
+    template<typename ClassT, typename ReturnT, typename... Args>
+    struct UnaryLambdaTraits<ReturnT( ClassT::* )( Args... ) const> {
+        static const bool isValid = false;
+    };
+
+    template<typename ClassT, typename ReturnT, typename ArgT>
+    struct UnaryLambdaTraits<ReturnT( ClassT::* )( ArgT ) const> {
+        static const bool isValid = true;
+        using ArgType = typename std::remove_const<typename std::remove_reference<ArgT>::type>::type;
+        using ReturnType = ReturnT;
+    };
+
+    class TokenStream;
+
+    // Transport for raw args (copied from main args, or supplied via init list for testing)
+    class Args {
+        friend TokenStream;
+        std::string m_exeName;
+        std::vector<std::string> m_args;
+
+    public:
+        Args( int argc, char const* const* argv )
+            : m_exeName(argv[0]),
+              m_args(argv + 1, argv + argc) {}
+
+        Args( std::initializer_list<std::string> args )
+        :   m_exeName( *args.begin() ),
+            m_args( args.begin()+1, args.end() )
+        {}
+
+        auto exeName() const -> std::string {
+            return m_exeName;
+        }
+    };
+
+    // Wraps a token coming from a token stream. These may not directly correspond to strings as a single string
+    // may encode an option + its argument if the : or = form is used
+    enum class TokenType {
+        Option, Argument
+    };
+    struct Token {
+        TokenType type;
+        std::string token;
+    };
+
+    inline auto isOptPrefix( char c ) -> bool {
+        return c == '-'
+#ifdef CLARA_PLATFORM_WINDOWS
+            || c == '/'
+#endif
+        ;
+    }
+
+    // Abstracts iterators into args as a stream of tokens, with option arguments uniformly handled
+    class TokenStream {
+        using Iterator = std::vector<std::string>::const_iterator;
+        Iterator it;
+        Iterator itEnd;
+        std::vector<Token> m_tokenBuffer;
+
+        void loadBuffer() {
+            m_tokenBuffer.resize( 0 );
+
+            // Skip any empty strings
+            while( it != itEnd && it->empty() )
+                ++it;
+
+            if( it != itEnd ) {
+                auto const &next = *it;
+                if( isOptPrefix( next[0] ) ) {
+                    auto delimiterPos = next.find_first_of( " :=" );
+                    if( delimiterPos != std::string::npos ) {
+                        m_tokenBuffer.push_back( { TokenType::Option, next.substr( 0, delimiterPos ) } );
+                        m_tokenBuffer.push_back( { TokenType::Argument, next.substr( delimiterPos + 1 ) } );
+                    } else {
+                        if( next[1] != '-' && next.size() > 2 ) {
+                            std::string opt = "- ";
+                            for( size_t i = 1; i < next.size(); ++i ) {
+                                opt[1] = next[i];
+                                m_tokenBuffer.push_back( { TokenType::Option, opt } );
+                            }
+                        } else {
+                            m_tokenBuffer.push_back( { TokenType::Option, next } );
+                        }
+                    }
+                } else {
+                    m_tokenBuffer.push_back( { TokenType::Argument, next } );
+                }
+            }
+        }
+
+    public:
+        explicit TokenStream( Args const &args ) : TokenStream( args.m_args.begin(), args.m_args.end() ) {}
+
+        TokenStream( Iterator it, Iterator itEnd ) : it( it ), itEnd( itEnd ) {
+            loadBuffer();
+        }
+
+        explicit operator bool() const {
+            return !m_tokenBuffer.empty() || it != itEnd;
+        }
+
+        auto count() const -> size_t { return m_tokenBuffer.size() + (itEnd - it); }
+
+        auto operator*() const -> Token {
+            assert( !m_tokenBuffer.empty() );
+            return m_tokenBuffer.front();
+        }
+
+        auto operator->() const -> Token const * {
+            assert( !m_tokenBuffer.empty() );
+            return &m_tokenBuffer.front();
+        }
+
+        auto operator++() -> TokenStream & {
+            if( m_tokenBuffer.size() >= 2 ) {
+                m_tokenBuffer.erase( m_tokenBuffer.begin() );
+            } else {
+                if( it != itEnd )
+                    ++it;
+                loadBuffer();
+            }
+            return *this;
+        }
+    };
+
+
+    class ResultBase {
+    public:
+        enum Type {
+            Ok, LogicError, RuntimeError
+        };
+
+    protected:
+        ResultBase( Type type ) : m_type( type ) {}
+        virtual ~ResultBase() = default;
+
+        virtual void enforceOk() const = 0;
+
+        Type m_type;
+    };
+
+    template<typename T>
+    class ResultValueBase : public ResultBase {
+    public:
+        auto value() const -> T const & {
+            enforceOk();
+            return m_value;
+        }
+
+    protected:
+        ResultValueBase( Type type ) : ResultBase( type ) {}
+
+        ResultValueBase( ResultValueBase const &other ) : ResultBase( other ) {
+            if( m_type == ResultBase::Ok )
+                new( &m_value ) T( other.m_value );
+        }
+
+        ResultValueBase( Type, T const &value ) : ResultBase( Ok ) {
+            new( &m_value ) T( value );
+        }
+
+        auto operator=( ResultValueBase const &other ) -> ResultValueBase & {
+            if( m_type == ResultBase::Ok )
+                m_value.~T();
+            ResultBase::operator=(other);
+            if( m_type == ResultBase::Ok )
+                new( &m_value ) T( other.m_value );
+            return *this;
+        }
+
+        ~ResultValueBase() override {
+            if( m_type == Ok )
+                m_value.~T();
+        }
+
+        union {
+            T m_value;
+        };
+    };
+
+    template<>
+    class ResultValueBase<void> : public ResultBase {
+    protected:
+        using ResultBase::ResultBase;
+    };
+
+    template<typename T = void>
+    class BasicResult : public ResultValueBase<T> {
+    public:
+        template<typename U>
+        explicit BasicResult( BasicResult<U> const &other )
+        :   ResultValueBase<T>( other.type() ),
+            m_errorMessage( other.errorMessage() )
+        {
+            assert( type() != ResultBase::Ok );
+        }
+
+        template<typename U>
+        static auto ok( U const &value ) -> BasicResult { return { ResultBase::Ok, value }; }
+        static auto ok() -> BasicResult { return { ResultBase::Ok }; }
+        static auto logicError( std::string const &message ) -> BasicResult { return { ResultBase::LogicError, message }; }
+        static auto runtimeError( std::string const &message ) -> BasicResult { return { ResultBase::RuntimeError, message }; }
+
+        explicit operator bool() const { return m_type == ResultBase::Ok; }
+        auto type() const -> ResultBase::Type { return m_type; }
+        auto errorMessage() const -> std::string { return m_errorMessage; }
+
+    protected:
+        void enforceOk() const override {
+
+            // Errors shouldn't reach this point, but if they do
+            // the actual error message will be in m_errorMessage
+            assert( m_type != ResultBase::LogicError );
+            assert( m_type != ResultBase::RuntimeError );
+            if( m_type != ResultBase::Ok )
+                std::abort();
+        }
+
+        std::string m_errorMessage; // Only populated if resultType is an error
+
+        BasicResult( ResultBase::Type type, std::string const &message )
+        :   ResultValueBase<T>(type),
+            m_errorMessage(message)
+        {
+            assert( m_type != ResultBase::Ok );
+        }
+
+        using ResultValueBase<T>::ResultValueBase;
+        using ResultBase::m_type;
+    };
+
+    enum class ParseResultType {
+        Matched, NoMatch, ShortCircuitAll, ShortCircuitSame
+    };
+
+    class ParseState {
+    public:
+
+        ParseState( ParseResultType type, TokenStream const &remainingTokens )
+        : m_type(type),
+          m_remainingTokens( remainingTokens )
+        {}
+
+        auto type() const -> ParseResultType { return m_type; }
+        auto remainingTokens() const -> TokenStream { return m_remainingTokens; }
+
+    private:
+        ParseResultType m_type;
+        TokenStream m_remainingTokens;
+    };
+
+    using Result = BasicResult<void>;
+    using ParserResult = BasicResult<ParseResultType>;
+    using InternalParseResult = BasicResult<ParseState>;
+
+    struct HelpColumns {
+        std::string left;
+        std::string right;
+    };
+
+    template<typename T>
+    inline auto convertInto( std::string const &source, T& target ) -> ParserResult {
+        std::stringstream ss;
+        ss << source;
+        ss >> target;
+        if( ss.fail() )
+            return ParserResult::runtimeError( "Unable to convert '" + source + "' to destination type" );
+        else
+            return ParserResult::ok( ParseResultType::Matched );
+    }
+    inline auto convertInto( std::string const &source, std::string& target ) -> ParserResult {
+        target = source;
+        return ParserResult::ok( ParseResultType::Matched );
+    }
+    inline auto convertInto( std::string const &source, bool &target ) -> ParserResult {
+        std::string srcLC = source;
+        std::transform( srcLC.begin(), srcLC.end(), srcLC.begin(), []( char c ) { return static_cast<char>( ::tolower(c) ); } );
+        if (srcLC == "y" || srcLC == "1" || srcLC == "true" || srcLC == "yes" || srcLC == "on")
+            target = true;
+        else if (srcLC == "n" || srcLC == "0" || srcLC == "false" || srcLC == "no" || srcLC == "off")
+            target = false;
+        else
+            return ParserResult::runtimeError( "Expected a boolean value but did not recognise: '" + source + "'" );
+        return ParserResult::ok( ParseResultType::Matched );
+    }
+#ifdef CLARA_CONFIG_OPTIONAL_TYPE
+    template<typename T>
+    inline auto convertInto( std::string const &source, CLARA_CONFIG_OPTIONAL_TYPE<T>& target ) -> ParserResult {
+        T temp;
+        auto result = convertInto( source, temp );
+        if( result )
+            target = std::move(temp);
+        return result;
+    }
+#endif // CLARA_CONFIG_OPTIONAL_TYPE
+
+    struct NonCopyable {
+        NonCopyable() = default;
+        NonCopyable( NonCopyable const & ) = delete;
+        NonCopyable( NonCopyable && ) = delete;
+        NonCopyable &operator=( NonCopyable const & ) = delete;
+        NonCopyable &operator=( NonCopyable && ) = delete;
+    };
+
+    struct BoundRef : NonCopyable {
+        virtual ~BoundRef() = default;
+        virtual auto isContainer() const -> bool { return false; }
+        virtual auto isFlag() const -> bool { return false; }
+    };
+    struct BoundValueRefBase : BoundRef {
+        virtual auto setValue( std::string const &arg ) -> ParserResult = 0;
+    };
+    struct BoundFlagRefBase : BoundRef {
+        virtual auto setFlag( bool flag ) -> ParserResult = 0;
+        virtual auto isFlag() const -> bool { return true; }
+    };
+
+    template<typename T>
+    struct BoundValueRef : BoundValueRefBase {
+        T &m_ref;
+
+        explicit BoundValueRef( T &ref ) : m_ref( ref ) {}
+
+        auto setValue( std::string const &arg ) -> ParserResult override {
+            return convertInto( arg, m_ref );
+        }
+    };
+
+    template<typename T>
+    struct BoundValueRef<std::vector<T>> : BoundValueRefBase {
+        std::vector<T> &m_ref;
+
+        explicit BoundValueRef( std::vector<T> &ref ) : m_ref( ref ) {}
+
+        auto isContainer() const -> bool override { return true; }
+
+        auto setValue( std::string const &arg ) -> ParserResult override {
+            T temp;
+            auto result = convertInto( arg, temp );
+            if( result )
+                m_ref.push_back( temp );
+            return result;
+        }
+    };
+
+    struct BoundFlagRef : BoundFlagRefBase {
+        bool &m_ref;
+
+        explicit BoundFlagRef( bool &ref ) : m_ref( ref ) {}
+
+        auto setFlag( bool flag ) -> ParserResult override {
+            m_ref = flag;
+            return ParserResult::ok( ParseResultType::Matched );
+        }
+    };
+
+    template<typename ReturnType>
+    struct LambdaInvoker {
+        static_assert( std::is_same<ReturnType, ParserResult>::value, "Lambda must return void or clara::ParserResult" );
+
+        template<typename L, typename ArgType>
+        static auto invoke( L const &lambda, ArgType const &arg ) -> ParserResult {
+            return lambda( arg );
+        }
+    };
+
+    template<>
+    struct LambdaInvoker<void> {
+        template<typename L, typename ArgType>
+        static auto invoke( L const &lambda, ArgType const &arg ) -> ParserResult {
+            lambda( arg );
+            return ParserResult::ok( ParseResultType::Matched );
+        }
+    };
+
+    template<typename ArgType, typename L>
+    inline auto invokeLambda( L const &lambda, std::string const &arg ) -> ParserResult {
+        ArgType temp{};
+        auto result = convertInto( arg, temp );
+        return !result
+           ? result
+           : LambdaInvoker<typename UnaryLambdaTraits<L>::ReturnType>::invoke( lambda, temp );
+    }
+
+
+    template<typename L>
+    struct BoundLambda : BoundValueRefBase {
+        L m_lambda;
+
+        static_assert( UnaryLambdaTraits<L>::isValid, "Supplied lambda must take exactly one argument" );
+        explicit BoundLambda( L const &lambda ) : m_lambda( lambda ) {}
+
+        auto setValue( std::string const &arg ) -> ParserResult override {
+            return invokeLambda<typename UnaryLambdaTraits<L>::ArgType>( m_lambda, arg );
+        }
+    };
+
+    template<typename L>
+    struct BoundFlagLambda : BoundFlagRefBase {
+        L m_lambda;
+
+        static_assert( UnaryLambdaTraits<L>::isValid, "Supplied lambda must take exactly one argument" );
+        static_assert( std::is_same<typename UnaryLambdaTraits<L>::ArgType, bool>::value, "flags must be boolean" );
+
+        explicit BoundFlagLambda( L const &lambda ) : m_lambda( lambda ) {}
+
+        auto setFlag( bool flag ) -> ParserResult override {
+            return LambdaInvoker<typename UnaryLambdaTraits<L>::ReturnType>::invoke( m_lambda, flag );
+        }
+    };
+
+    enum class Optionality { Optional, Required };
+
+    struct Parser;
+
+    class ParserBase {
+    public:
+        virtual ~ParserBase() = default;
+        virtual auto validate() const -> Result { return Result::ok(); }
+        virtual auto parse( std::string const& exeName, TokenStream const &tokens) const -> InternalParseResult  = 0;
+        virtual auto cardinality() const -> size_t { return 1; }
+
+        auto parse( Args const &args ) const -> InternalParseResult {
+            return parse( args.exeName(), TokenStream( args ) );
+        }
+    };
+
+    template<typename DerivedT>
+    class ComposableParserImpl : public ParserBase {
+    public:
+        template<typename T>
+        auto operator|( T const &other ) const -> Parser;
+
+		template<typename T>
+        auto operator+( T const &other ) const -> Parser;
+    };
+
+    // Common code and state for Args and Opts
+    template<typename DerivedT>
+    class ParserRefImpl : public ComposableParserImpl<DerivedT> {
+    protected:
+        Optionality m_optionality = Optionality::Optional;
+        std::shared_ptr<BoundRef> m_ref;
+        std::string m_hint;
+        std::string m_description;
+
+        explicit ParserRefImpl( std::shared_ptr<BoundRef> const &ref ) : m_ref( ref ) {}
+
+    public:
+        template<typename T>
+        ParserRefImpl( T &ref, std::string const &hint )
+        :   m_ref( std::make_shared<BoundValueRef<T>>( ref ) ),
+            m_hint( hint )
+        {}
+
+        template<typename LambdaT>
+        ParserRefImpl( LambdaT const &ref, std::string const &hint )
+        :   m_ref( std::make_shared<BoundLambda<LambdaT>>( ref ) ),
+            m_hint(hint)
+        {}
+
+        auto operator()( std::string const &description ) -> DerivedT & {
+            m_description = description;
+            return static_cast<DerivedT &>( *this );
+        }
+
+        auto optional() -> DerivedT & {
+            m_optionality = Optionality::Optional;
+            return static_cast<DerivedT &>( *this );
+        };
+
+        auto required() -> DerivedT & {
+            m_optionality = Optionality::Required;
+            return static_cast<DerivedT &>( *this );
+        };
+
+        auto isOptional() const -> bool {
+            return m_optionality == Optionality::Optional;
+        }
+
+        auto cardinality() const -> size_t override {
+            if( m_ref->isContainer() )
+                return 0;
+            else
+                return 1;
+        }
+
+        auto hint() const -> std::string { return m_hint; }
+    };
+
+    class ExeName : public ComposableParserImpl<ExeName> {
+        std::shared_ptr<std::string> m_name;
+        std::shared_ptr<BoundValueRefBase> m_ref;
+
+        template<typename LambdaT>
+        static auto makeRef(LambdaT const &lambda) -> std::shared_ptr<BoundValueRefBase> {
+            return std::make_shared<BoundLambda<LambdaT>>( lambda) ;
+        }
+
+    public:
+        ExeName() : m_name( std::make_shared<std::string>( "<executable>" ) ) {}
+
+        explicit ExeName( std::string &ref ) : ExeName() {
+            m_ref = std::make_shared<BoundValueRef<std::string>>( ref );
+        }
+
+        template<typename LambdaT>
+        explicit ExeName( LambdaT const& lambda ) : ExeName() {
+            m_ref = std::make_shared<BoundLambda<LambdaT>>( lambda );
+        }
+
+        // The exe name is not parsed out of the normal tokens, but is handled specially
+        auto parse( std::string const&, TokenStream const &tokens ) const -> InternalParseResult override {
+            return InternalParseResult::ok( ParseState( ParseResultType::NoMatch, tokens ) );
+        }
+
+        auto name() const -> std::string { return *m_name; }
+        auto set( std::string const& newName ) -> ParserResult {
+
+            auto lastSlash = newName.find_last_of( "\\/" );
+            auto filename = ( lastSlash == std::string::npos )
+                    ? newName
+                    : newName.substr( lastSlash+1 );
+
+            *m_name = filename;
+            if( m_ref )
+                return m_ref->setValue( filename );
+            else
+                return ParserResult::ok( ParseResultType::Matched );
+        }
+    };
+
+    class Arg : public ParserRefImpl<Arg> {
+    public:
+        using ParserRefImpl::ParserRefImpl;
+
+        auto parse( std::string const &, TokenStream const &tokens ) const -> InternalParseResult override {
+            auto validationResult = validate();
+            if( !validationResult )
+                return InternalParseResult( validationResult );
+
+            auto remainingTokens = tokens;
+            auto const &token = *remainingTokens;
+            if( token.type != TokenType::Argument )
+                return InternalParseResult::ok( ParseState( ParseResultType::NoMatch, remainingTokens ) );
+
+            assert( !m_ref->isFlag() );
+            auto valueRef = static_cast<detail::BoundValueRefBase*>( m_ref.get() );
+
+            auto result = valueRef->setValue( remainingTokens->token );
+            if( !result )
+                return InternalParseResult( result );
+            else
+                return InternalParseResult::ok( ParseState( ParseResultType::Matched, ++remainingTokens ) );
+        }
+    };
+
+    inline auto normaliseOpt( std::string const &optName ) -> std::string {
+#ifdef CLARA_PLATFORM_WINDOWS
+        if( optName[0] == '/' )
+            return "-" + optName.substr( 1 );
+        else
+#endif
+            return optName;
+    }
+
+    class Opt : public ParserRefImpl<Opt> {
+    protected:
+        std::vector<std::string> m_optNames;
+
+    public:
+        template<typename LambdaT>
+        explicit Opt( LambdaT const &ref ) : ParserRefImpl( std::make_shared<BoundFlagLambda<LambdaT>>( ref ) ) {}
+
+        explicit Opt( bool &ref ) : ParserRefImpl( std::make_shared<BoundFlagRef>( ref ) ) {}
+
+        template<typename LambdaT>
+        Opt( LambdaT const &ref, std::string const &hint ) : ParserRefImpl( ref, hint ) {}
+
+        template<typename T>
+        Opt( T &ref, std::string const &hint ) : ParserRefImpl( ref, hint ) {}
+
+        auto operator[]( std::string const &optName ) -> Opt & {
+            m_optNames.push_back( optName );
+            return *this;
+        }
+
+        auto getHelpColumns() const -> std::vector<HelpColumns> {
+            std::ostringstream oss;
+            bool first = true;
+            for( auto const &opt : m_optNames ) {
+                if (first)
+                    first = false;
+                else
+                    oss << ", ";
+                oss << opt;
+            }
+            if( !m_hint.empty() )
+                oss << " <" << m_hint << ">";
+            return { { oss.str(), m_description } };
+        }
+
+        auto isMatch( std::string const &optToken ) const -> bool {
+            auto normalisedToken = normaliseOpt( optToken );
+            for( auto const &name : m_optNames ) {
+                if( normaliseOpt( name ) == normalisedToken )
+                    return true;
+            }
+            return false;
+        }
+
+        using ParserBase::parse;
+
+        auto parse( std::string const&, TokenStream const &tokens ) const -> InternalParseResult override {
+            auto validationResult = validate();
+            if( !validationResult )
+                return InternalParseResult( validationResult );
+
+            auto remainingTokens = tokens;
+            if( remainingTokens && remainingTokens->type == TokenType::Option ) {
+                auto const &token = *remainingTokens;
+                if( isMatch(token.token ) ) {
+                    if( m_ref->isFlag() ) {
+                        auto flagRef = static_cast<detail::BoundFlagRefBase*>( m_ref.get() );
+                        auto result = flagRef->setFlag( true );
+                        if( !result )
+                            return InternalParseResult( result );
+                        if( result.value() == ParseResultType::ShortCircuitAll )
+                            return InternalParseResult::ok( ParseState( result.value(), remainingTokens ) );
+                    } else {
+                        auto valueRef = static_cast<detail::BoundValueRefBase*>( m_ref.get() );
+                        ++remainingTokens;
+                        if( !remainingTokens )
+                            return InternalParseResult::runtimeError( "Expected argument following " + token.token );
+                        auto const &argToken = *remainingTokens;
+                        if( argToken.type != TokenType::Argument )
+                            return InternalParseResult::runtimeError( "Expected argument following " + token.token );
+                        auto result = valueRef->setValue( argToken.token );
+                        if( !result )
+                            return InternalParseResult( result );
+                        if( result.value() == ParseResultType::ShortCircuitAll )
+                            return InternalParseResult::ok( ParseState( result.value(), remainingTokens ) );
+                    }
+                    return InternalParseResult::ok( ParseState( ParseResultType::Matched, ++remainingTokens ) );
+                }
+            }
+            return InternalParseResult::ok( ParseState( ParseResultType::NoMatch, remainingTokens ) );
+        }
+
+        auto validate() const -> Result override {
+            if( m_optNames.empty() )
+                return Result::logicError( "No options supplied to Opt" );
+            for( auto const &name : m_optNames ) {
+                if( name.empty() )
+                    return Result::logicError( "Option name cannot be empty" );
+#ifdef CLARA_PLATFORM_WINDOWS
+                if( name[0] != '-' && name[0] != '/' )
+                    return Result::logicError( "Option name must begin with '-' or '/'" );
+#else
+                if( name[0] != '-' )
+                    return Result::logicError( "Option name must begin with '-'" );
+#endif
+            }
+            return ParserRefImpl::validate();
+        }
+    };
+
+    struct Help : Opt {
+        Help( bool &showHelpFlag )
+        :   Opt([&]( bool flag ) {
+                showHelpFlag = flag;
+                return ParserResult::ok( ParseResultType::ShortCircuitAll );
+            })
+        {
+            static_cast<Opt &>( *this )
+                    ("display usage information")
+                    ["-?"]["-h"]["--help"]
+                    .optional();
+        }
+    };
+
+
+    struct Parser : ParserBase {
+
+        mutable ExeName m_exeName;
+        std::vector<Opt> m_options;
+        std::vector<Arg> m_args;
+
+        auto operator|=( ExeName const &exeName ) -> Parser & {
+            m_exeName = exeName;
+            return *this;
+        }
+
+        auto operator|=( Arg const &arg ) -> Parser & {
+            m_args.push_back(arg);
+            return *this;
+        }
+
+        auto operator|=( Opt const &opt ) -> Parser & {
+            m_options.push_back(opt);
+            return *this;
+        }
+
+        auto operator|=( Parser const &other ) -> Parser & {
+            m_options.insert(m_options.end(), other.m_options.begin(), other.m_options.end());
+            m_args.insert(m_args.end(), other.m_args.begin(), other.m_args.end());
+            return *this;
+        }
+
+        template<typename T>
+        auto operator|( T const &other ) const -> Parser {
+            return Parser( *this ) |= other;
+        }
+
+        // Forward deprecated interface with '+' instead of '|'
+        template<typename T>
+        auto operator+=( T const &other ) -> Parser & { return operator|=( other ); }
+        template<typename T>
+        auto operator+( T const &other ) const -> Parser { return operator|( other ); }
+
+        auto getHelpColumns() const -> std::vector<HelpColumns> {
+            std::vector<HelpColumns> cols;
+            for (auto const &o : m_options) {
+                auto childCols = o.getHelpColumns();
+                cols.insert( cols.end(), childCols.begin(), childCols.end() );
+            }
+            return cols;
+        }
+
+        void writeToStream( std::ostream &os ) const {
+            if (!m_exeName.name().empty()) {
+                os << "usage:\n" << "  " << m_exeName.name() << " ";
+                bool required = true, first = true;
+                for( auto const &arg : m_args ) {
+                    if (first)
+                        first = false;
+                    else
+                        os << " ";
+                    if( arg.isOptional() && required ) {
+                        os << "[";
+                        required = false;
+                    }
+                    os << "<" << arg.hint() << ">";
+                    if( arg.cardinality() == 0 )
+                        os << " ... ";
+                }
+                if( !required )
+                    os << "]";
+                if( !m_options.empty() )
+                    os << " options";
+                os << "\n\nwhere options are:" << std::endl;
+            }
+
+            auto rows = getHelpColumns();
+            size_t consoleWidth = CLARA_CONFIG_CONSOLE_WIDTH;
+            size_t optWidth = 0;
+            for( auto const &cols : rows )
+                optWidth = (std::max)(optWidth, cols.left.size() + 2);
+
+            optWidth = (std::min)(optWidth, consoleWidth/2);
+
+            for( auto const &cols : rows ) {
+                auto row =
+                        TextFlow::Column( cols.left ).width( optWidth ).indent( 2 ) +
+                        TextFlow::Spacer(4) +
+                        TextFlow::Column( cols.right ).width( consoleWidth - 7 - optWidth );
+                os << row << std::endl;
+            }
+        }
+
+        friend auto operator<<( std::ostream &os, Parser const &parser ) -> std::ostream& {
+            parser.writeToStream( os );
+            return os;
+        }
+
+        auto validate() const -> Result override {
+            for( auto const &opt : m_options ) {
+                auto result = opt.validate();
+                if( !result )
+                    return result;
+            }
+            for( auto const &arg : m_args ) {
+                auto result = arg.validate();
+                if( !result )
+                    return result;
+            }
+            return Result::ok();
+        }
+
+        using ParserBase::parse;
+
+        auto parse( std::string const& exeName, TokenStream const &tokens ) const -> InternalParseResult override {
+
+            struct ParserInfo {
+                ParserBase const* parser = nullptr;
+                size_t count = 0;
+            };
+            const size_t totalParsers = m_options.size() + m_args.size();
+            assert( totalParsers < 512 );
+            // ParserInfo parseInfos[totalParsers]; // <-- this is what we really want to do
+            ParserInfo parseInfos[512];
+
+            {
+                size_t i = 0;
+                for (auto const &opt : m_options) parseInfos[i++].parser = &opt;
+                for (auto const &arg : m_args) parseInfos[i++].parser = &arg;
+            }
+
+            m_exeName.set( exeName );
+
+            auto result = InternalParseResult::ok( ParseState( ParseResultType::NoMatch, tokens ) );
+            while( result.value().remainingTokens() ) {
+                bool tokenParsed = false;
+
+                for( size_t i = 0; i < totalParsers; ++i ) {
+                    auto&  parseInfo = parseInfos[i];
+                    if( parseInfo.parser->cardinality() == 0 || parseInfo.count < parseInfo.parser->cardinality() ) {
+                        result = parseInfo.parser->parse(exeName, result.value().remainingTokens());
+                        if (!result)
+                            return result;
+                        if (result.value().type() != ParseResultType::NoMatch) {
+                            tokenParsed = true;
+                            ++parseInfo.count;
+                            break;
+                        }
+                    }
+                }
+
+                if( result.value().type() == ParseResultType::ShortCircuitAll )
+                    return result;
+                if( !tokenParsed )
+                    return InternalParseResult::runtimeError( "Unrecognised token: " + result.value().remainingTokens()->token );
+            }
+            // !TBD Check missing required options
+            return result;
+        }
+    };
+
+    template<typename DerivedT>
+    template<typename T>
+    auto ComposableParserImpl<DerivedT>::operator|( T const &other ) const -> Parser {
+        return Parser() | static_cast<DerivedT const &>( *this ) | other;
+    }
+} // namespace detail
+
+
+// A Combined parser
+using detail::Parser;
+
+// A parser for options
+using detail::Opt;
+
+// A parser for arguments
+using detail::Arg;
+
+// Wrapper for argc, argv from main()
+using detail::Args;
+
+// Specifies the name of the executable
+using detail::ExeName;
+
+// Convenience wrapper for option parser that specifies the help option
+using detail::Help;
+
+// enum of result types from a parse
+using detail::ParseResultType;
+
+// Result type for parser operation
+using detail::ParserResult;
+
+
+} // namespace clara
+
+#endif // CLARA_HPP_INCLUDED
diff --git a/meson.build b/meson.build
index 4dc9db6a..ce520079 100644
--- a/meson.build
+++ b/meson.build
@@ -9,7 +9,7 @@ project(
     ],
 )
 
-cpp_args = []
+cpp_args = ['-DVERSION="@0@"'.format(meson.project_version())]
 cpp_link_args = []
 
 if false # libc++
diff --git a/src/client.cpp b/src/client.cpp
index 0b1e67d0..c3989e6e 100644
--- a/src/client.cpp
+++ b/src/client.cpp
@@ -1,8 +1,9 @@
 #include "client.hpp"
+#include "util/clara.hpp"
 #include <iostream>
 
 waybar::Client::Client(int argc, char* argv[])
-  : gtk_app(Gtk::Application::create(argc, argv, "fr.arouillard.waybar")),
+  : gtk_main(argc, argv),
     gdk_display(Gdk::Display::get_default())
 {
   if (!gdk_display) {
@@ -12,25 +13,6 @@ waybar::Client::Client(int argc, char* argv[])
     throw std::runtime_error("Bar need to run under Wayland");
   }
   wl_display = gdk_wayland_display_get_wl_display(gdk_display->gobj());
-
-  config_file = getValidPath({
-    "$XDG_CONFIG_HOME/waybar/config",
-    "$HOME/.config/waybar/config",
-    "$HOME/waybar/config",
-    "/etc/xdg/waybar/config",
-    "./resources/config",
-  });
-  css_file = getValidPath({
-    "$XDG_CONFIG_HOME/waybar/style.css",
-    "$HOME/.config/waybar/style.css",
-    "$HOME/waybar/style.css",
-    "/etc/xdg/waybar/style.css",
-    "./resources/style.css",
-  });
-  if (css_file.empty() || config_file.empty()) {
-    throw std::runtime_error("Missing required resources files");
-  }
-  std::cout << "Resources files: " + config_file + ", " + css_file << std::endl;
 }
 
 const std::string waybar::Client::getValidPath(std::vector<std::string> paths)
@@ -88,6 +70,28 @@ void waybar::Client::handleGlobalRemove(void* data,
   }
 }
 
+void waybar::Client::setupConfigs(const std::string& config, const std::string& style)
+{
+  config_file = config.empty() ? getValidPath({
+    "$XDG_CONFIG_HOME/waybar/config",
+    "$HOME/.config/waybar/config",
+    "$HOME/waybar/config",
+    "/etc/xdg/waybar/config",
+    "./resources/config",
+  }) : config;
+  css_file = style.empty() ? getValidPath({
+    "$XDG_CONFIG_HOME/waybar/style.css",
+    "$HOME/.config/waybar/style.css",
+    "$HOME/waybar/style.css",
+    "/etc/xdg/waybar/style.css",
+    "./resources/style.css",
+  }) : style;
+  if (css_file.empty() || config_file.empty()) {
+    throw std::runtime_error("Missing required resources files");
+  }
+  std::cout << "Resources files: " + config_file + ", " + css_file << std::endl;
+}
+
 void waybar::Client::bindInterfaces()
 {
   registry = wl_display_get_registry(wl_display);
@@ -103,11 +107,32 @@ void waybar::Client::bindInterfaces()
   wl_display_roundtrip(wl_display);
 }
 
-int waybar::Client::main(int /*argc*/, char* /*argv*/[])
+int waybar::Client::main(int argc, char* argv[])
 {
+  bool show_help = false;
+  bool show_version = false;
+  std::string config;
+  std::string style;
+  auto cli = clara::detail::Help(show_help)
+    | clara::detail::Opt(show_version)["-v"]["--version"]("Show version")
+    | clara::detail::Opt(config, "config")["-c"]["--config"]("Config path")
+    | clara::detail::Opt(style, "style")["-s"]["--style"]("Style path");
+  auto res = cli.parse(clara::detail::Args(argc, argv));
+  if (!res) {
+    std::cerr << "Error in command line: " << res.errorMessage() << std::endl;
+    return 1;
+  }
+  if (show_help) {
+    std::cout << cli << std::endl;
+    return 0;
+  }
+  if (show_version) {
+    std::cout << "Waybar v" << VERSION << std::endl;
+    return 0;
+  }
+  setupConfigs(config, style);
   bindInterfaces();
-  gtk_app->hold();
-  gtk_app->run();
+  gtk_main.run();
   bars.clear();
   zxdg_output_manager_v1_destroy(xdg_output_manager);
   zwlr_layer_shell_v1_destroy(layer_shell);
diff --git a/src/factory.cpp b/src/factory.cpp
index a72d938c..a9fdf0c5 100644
--- a/src/factory.cpp
+++ b/src/factory.cpp
@@ -7,43 +7,45 @@ waybar::Factory::Factory(const Bar& bar, const Json::Value& config)
 waybar::IModule* waybar::Factory::makeModule(const std::string &name) const
 {
   try {
-    auto ref = name.substr(0, name.find("#"));
+    auto hash_pos = name.find("#");
+    auto ref = name.substr(0, hash_pos);
+    auto id = hash_pos != std::string::npos ? name.substr(hash_pos + 1) : "";
     if (ref == "battery") {
-      return new waybar::modules::Battery(config_[name]);
+      return new waybar::modules::Battery(id, config_[name]);
     }
     #ifdef HAVE_SWAY
     if (ref == "sway/mode") {
-      return new waybar::modules::sway::Mode(bar_, config_[name]);
+      return new waybar::modules::sway::Mode(id, bar_, config_[name]);
     }
     if (ref == "sway/workspaces") {
-      return new waybar::modules::sway::Workspaces(bar_, config_[name]);
+      return new waybar::modules::sway::Workspaces(id, bar_, config_[name]);
     }
     if (ref == "sway/window") {
-      return new waybar::modules::sway::Window(bar_, config_[name]);
+      return new waybar::modules::sway::Window(id, bar_, config_[name]);
     }
     #endif
     if (ref == "memory") {
-      return new waybar::modules::Memory(config_[name]);
+      return new waybar::modules::Memory(id, config_[name]);
     }
     if (ref == "cpu") {
-      return new waybar::modules::Cpu(config_[name]);
+      return new waybar::modules::Cpu(id, config_[name]);
     }
     if (ref == "clock") {
-      return new waybar::modules::Clock(config_[name]);
+      return new waybar::modules::Clock(id, config_[name]);
     }
     #ifdef HAVE_DBUSMENU
     if (ref == "tray") {
-      return new waybar::modules::SNI::Tray(config_[name]);
+      return new waybar::modules::SNI::Tray(id, config_[name]);
     }
     #endif
     #ifdef HAVE_LIBNL
     if (ref == "network") {
-      return new waybar::modules::Network(config_[name]);
+      return new waybar::modules::Network(id, config_[name]);
     }
     #endif
     #ifdef HAVE_LIBPULSE
     if (ref == "pulseaudio") {
-      return new waybar::modules::Pulseaudio(config_[name]);
+      return new waybar::modules::Pulseaudio(id, config_[name]);
     }
     #endif
     if (ref.compare(0, 7, "custom/") == 0 && ref.size() > 7) {
diff --git a/src/modules/battery.cpp b/src/modules/battery.cpp
index 9fae5ed6..d4d131ab 100644
--- a/src/modules/battery.cpp
+++ b/src/modules/battery.cpp
@@ -1,8 +1,12 @@
 #include "modules/battery.hpp"
 
-waybar::modules::Battery::Battery(const Json::Value& config)
+waybar::modules::Battery::Battery(const std::string& id, const Json::Value& config)
   : ALabel(config, "{capacity}%", 60)
 {
+  label_.set_name("battery");
+  if (!id.empty()) {
+    label_.get_style_context()->add_class(id);
+  }
   try {
     if (config_["bat"].isString()) {
       auto dir = data_dir_ / config_["bat"].asString();
@@ -131,10 +135,8 @@ auto waybar::modules::Battery::update() -> void
   }
   if (format.empty()) {
     event_box_.hide();
-    label_.set_name("");
   } else {
     event_box_.show();
-    label_.set_name("battery");
     label_.set_markup(fmt::format(format, fmt::arg("capacity", capacity),
       fmt::arg("icon", getIcon(capacity))));
   }
diff --git a/src/modules/clock.cpp b/src/modules/clock.cpp
index 958f15fe..2b7b41fb 100644
--- a/src/modules/clock.cpp
+++ b/src/modules/clock.cpp
@@ -1,9 +1,12 @@
 #include "modules/clock.hpp"
 
-waybar::modules::Clock::Clock(const Json::Value& config)
+waybar::modules::Clock::Clock(const std::string& id, const Json::Value& config)
   : ALabel(config, "{:%H:%M}", 60)
 {
   label_.set_name("clock");
+  if (!id.empty()) {
+    label_.get_style_context()->add_class(id);
+  }
   thread_ = [this] {
     auto now = waybar::chrono::clock::now();
     dp.emit();
diff --git a/src/modules/cpu.cpp b/src/modules/cpu.cpp
index 91e177d2..5d9a1c87 100644
--- a/src/modules/cpu.cpp
+++ b/src/modules/cpu.cpp
@@ -1,9 +1,12 @@
 #include "modules/cpu.hpp"
 
-waybar::modules::Cpu::Cpu(const Json::Value& config)
+waybar::modules::Cpu::Cpu(const std::string& id, const Json::Value& config)
   : ALabel(config, "{usage}%", 10)
 {
   label_.set_name("cpu");
+  if (!id.empty()) {
+    label_.get_style_context()->add_class(id);
+  }
   thread_ = [this] {
     dp.emit();
     thread_.sleep_for(interval_);
diff --git a/src/modules/custom.cpp b/src/modules/custom.cpp
index fd6f66bf..68d98462 100644
--- a/src/modules/custom.cpp
+++ b/src/modules/custom.cpp
@@ -1,18 +1,18 @@
 #include "modules/custom.hpp"
 
-waybar::modules::Custom::Custom(const std::string name,
+waybar::modules::Custom::Custom(const std::string& name,
   const Json::Value& config)
   : ALabel(config, "{}"), name_(name), fp_(nullptr)
 {
+  label_.set_name("custom-" + name_);
   if (config_["exec"].isString()) {
     if (interval_.count() > 0) {
       delayWorker();
     } else {
       continuousWorker();
     }
-  } else {
-      update();
   }
+  dp.emit();
 }
 
 waybar::modules::Custom::~Custom()
@@ -31,8 +31,7 @@ void waybar::modules::Custom::delayWorker()
       auto res = waybar::util::command::exec(config_["exec-if"].asString());
       if (res.exit_code != 0) {
         can_update = false;
-        label_.hide();
-        label_.set_name("");
+        event_box_.hide();
       }
     }
     if (can_update) {
@@ -80,11 +79,8 @@ auto waybar::modules::Custom::update() -> void
 {
   // Hide label if output is empty
   if (config_["exec"].isString() && (output_.out.empty() || output_.exit_code != 0)) {
-    label_.hide();
-    label_.set_name("");
+    event_box_.hide();
   } else {
-    label_.set_name("custom-" + name_);
-
     if (config_["return-type"].asString() == "json") {
       parseOutputJson();
     } else {
@@ -109,7 +105,7 @@ auto waybar::modules::Custom::update() -> void
       prevclass_ = "";
     }
 
-    label_.show();
+    event_box_.show();
   }
 }
 
diff --git a/src/modules/memory.cpp b/src/modules/memory.cpp
index 591c32a4..9ddace76 100644
--- a/src/modules/memory.cpp
+++ b/src/modules/memory.cpp
@@ -1,8 +1,12 @@
 #include "modules/memory.hpp"
 
-waybar::modules::Memory::Memory(const Json::Value& config)
+waybar::modules::Memory::Memory(const std::string& id, const Json::Value& config)
   : ALabel(config, "{}%", 30)
 {
+  label_.set_name("memory");
+  if (!id.empty()) {
+    label_.get_style_context()->add_class(id);
+  }
   thread_ = [this] {
     dp.emit();
     thread_.sleep_for(interval_);
@@ -17,11 +21,9 @@ auto waybar::modules::Memory::update() -> void
     label_.set_markup(fmt::format(format_, used_ram_percentage));
     auto used_ram_gigabytes = (memtotal_ - memfree_) / std::pow(1024, 2);
     label_.set_tooltip_text(fmt::format("{:.{}f}Gb used", used_ram_gigabytes, 1));
-    label_.set_name("memory");
-    label_.show();
+    event_box_.show();
   } else {
-    label_.set_name("");
-    label_.hide();
+    event_box_.hide();
   }
 }
 
diff --git a/src/modules/network.cpp b/src/modules/network.cpp
index a27fc53e..c2a8175d 100644
--- a/src/modules/network.cpp
+++ b/src/modules/network.cpp
@@ -1,9 +1,13 @@
 #include "modules/network.hpp"
 
-waybar::modules::Network::Network(const Json::Value& config)
+waybar::modules::Network::Network(const std::string& id, const Json::Value& config)
   : ALabel(config, "{ifname}", 60), family_(AF_INET),
     cidr_(-1), signal_strength_dbm_(0), signal_strength_(0)
 {
+  label_.set_name("network");
+  if (!id.empty()) {
+    label_.get_style_context()->add_class(id);
+  }
   sock_fd_ = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
   if (sock_fd_ < 0) {
     throw std::runtime_error("Can't open network socket");
@@ -29,10 +33,9 @@ waybar::modules::Network::Network(const Json::Value& config)
     }
   }
   initNL80211();
-  label_.set_name("network");
   // Trigger first values
   getInfo();
-  update();
+  dp.emit();
   worker();
 }
 
diff --git a/src/modules/pulseaudio.cpp b/src/modules/pulseaudio.cpp
index 213be991..d943ce4a 100644
--- a/src/modules/pulseaudio.cpp
+++ b/src/modules/pulseaudio.cpp
@@ -1,6 +1,6 @@
 #include "modules/pulseaudio.hpp"
 
-waybar::modules::Pulseaudio::Pulseaudio(const Json::Value &config)
+waybar::modules::Pulseaudio::Pulseaudio(const std::string& id, const Json::Value &config)
     : ALabel(config, "{volume}%"),
       mainloop_(nullptr),
       mainloop_api_(nullptr),
@@ -10,6 +10,9 @@ waybar::modules::Pulseaudio::Pulseaudio(const Json::Value &config)
       muted_(false),
       scrolling_(false) {
   label_.set_name("pulseaudio");
+  if (!id.empty()) {
+    label_.get_style_context()->add_class(id);
+  }
   mainloop_ = pa_threaded_mainloop_new();
   if (mainloop_ == nullptr) {
     throw std::runtime_error("pa_mainloop_new() failed.");
diff --git a/src/modules/sni/tray.cpp b/src/modules/sni/tray.cpp
index 6b974648..2f372ba6 100644
--- a/src/modules/sni/tray.cpp
+++ b/src/modules/sni/tray.cpp
@@ -2,7 +2,7 @@
 
 #include <iostream>
 
-waybar::modules::SNI::Tray::Tray(const Json::Value &config)
+waybar::modules::SNI::Tray::Tray(const std::string& id, const Json::Value &config)
     : config_(config), watcher_(), host_(nb_hosts_, config,
     std::bind(&Tray::onAdd, this, std::placeholders::_1),
     std::bind(&Tray::onRemove, this, std::placeholders::_1))
diff --git a/src/modules/sway/mode.cpp b/src/modules/sway/mode.cpp
index e0c73f8a..2b25a925 100644
--- a/src/modules/sway/mode.cpp
+++ b/src/modules/sway/mode.cpp
@@ -1,12 +1,17 @@
 #include "modules/sway/mode.hpp"
 
-waybar::modules::sway::Mode::Mode(const Bar& bar, const Json::Value& config)
+waybar::modules::sway::Mode::Mode(const std::string& id, const Bar& bar, const Json::Value& config)
   : ALabel(config, "{}"), bar_(bar)
 {
+  label_.set_name("mode");
+  if (!id.empty()) {
+    label_.get_style_context()->add_class(id);
+  }
   ipc_.connect();
   ipc_.subscribe("[ \"mode\" ]");
   // Launch worker
   worker();
+  dp.emit();
 }
 
 void waybar::modules::sway::Mode::worker()
@@ -32,12 +37,10 @@ void waybar::modules::sway::Mode::worker()
 auto waybar::modules::sway::Mode::update() -> void
 {
   if (mode_.empty()) {
-    label_.set_name("");
-    label_.hide();
+    event_box_.hide();
   } else {
-    label_.set_name("mode");
     label_.set_markup(fmt::format(format_, mode_));
     label_.set_tooltip_text(mode_);
-    label_.show();
+    event_box_.show();
   }
 }
\ No newline at end of file
diff --git a/src/modules/sway/window.cpp b/src/modules/sway/window.cpp
index 29d147a0..6f18f65c 100644
--- a/src/modules/sway/window.cpp
+++ b/src/modules/sway/window.cpp
@@ -1,9 +1,12 @@
 #include "modules/sway/window.hpp"
 
-waybar::modules::sway::Window::Window(const Bar &bar, const Json::Value& config)
+waybar::modules::sway::Window::Window(const std::string& id, const Bar &bar, const Json::Value& config)
   : ALabel(config, "{}"), bar_(bar), windowId_(-1)
 {
   label_.set_name("window");
+  if (!id.empty()) {
+    label_.get_style_context()->add_class(id);
+  }
   if (label_.get_max_width_chars() == -1) {
     label_.set_hexpand(true);
     label_.set_ellipsize(Pango::EllipsizeMode::ELLIPSIZE_END);
diff --git a/src/modules/sway/workspaces.cpp b/src/modules/sway/workspaces.cpp
index 07ed0f1a..911e3113 100644
--- a/src/modules/sway/workspaces.cpp
+++ b/src/modules/sway/workspaces.cpp
@@ -1,10 +1,13 @@
 #include "modules/sway/workspaces.hpp"
 
-waybar::modules::sway::Workspaces::Workspaces(const Bar& bar,
+waybar::modules::sway::Workspaces::Workspaces(const std::string& id, const Bar& bar,
   const Json::Value& config)
   : bar_(bar), config_(config), scrolling_(false)
 {
   box_.set_name("workspaces");
+  if (!id.empty()) {
+    box_.get_style_context()->add_class(id);
+  }
   ipc_.connect();
   ipc_.subscribe("[ \"workspace\" ]");
   // Launch worker