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+/** 
+ * @file llcommandlineparser.h
+ * @brief LLCommandLineParser class declaration
+ *
+ * $LicenseInfo:firstyear=2007&license=viewergpl$
+ * 
+ * Copyright (c) 2007-2008, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLCOMMANDLINEPARSER_H
+#define LL_LLCOMMANDLINEPARSER_H
+
+#include <boost/function/function1.hpp>
+
+// *NOTE:Mani The following is a forward decl of 
+// boost::program_options::command_line_parser
+// "yay" c++!
+namespace boost
+{
+        namespace program_options
+        {
+                template <class charT> class basic_command_line_parser;
+                typedef basic_command_line_parser<char> command_line_parser;
+        }
+}
+
+
+/** 
+ * @class LLCommandLineParser
+ * @brief Handle defining and parsing the command line.
+ */
+class LLCommandLineParser
+{
+public:
+        typedef std::vector< std::string > token_vector_t;
+        
+        /**
+         * @brief Add a value-less option to the command line description.
+         * @param option_name The long name of the cmd-line option. 
+         * @param description The text description of the option usage.
+         */
+        void addOptionDesc(
+                                           const LLString& option_name, 
+                                           boost::function1<void, const token_vector_t&> notify_callback = 0,
+                                           unsigned int num_tokens = 0,
+                                           const LLString& description = LLString::null,
+                                           const LLString& short_name = LLString::null,
+                                           bool composing = false,
+                                           bool positional = false,
+                                           bool last_option = false);
+        
+        /** 
+         * @brief Parse the command line given by argc/argv.
+         */
+        bool parseCommandLine(int argc, char **argv);
+        
+        /** 
+         * @brief Parse the command line contained by the given file.
+         */
+        bool parseCommandLineString(const std::string& str);
+        
+        /** 
+         * @brief Parse the command line contained by the given file.
+         */
+        bool parseCommandLineFile(const std::basic_istream< char >& file);
+        
+        /** 
+         * @brief Call callbacks associated with option descriptions.
+         * 
+         * Use this to handle the results of parsing. 
+         */
+        void notify();
+        
+        /** @brief Print a description of the configured options.
+         *
+         * Use this to print a description of options to the
+         * given ostream. Useful for displaying usage info.
+         */
+        std::ostream& printOptionsDesc(std::ostream& os) const;
+        
+        /** @brief Manual option setting accessors.
+         * 
+         * Use these to retrieve get the values set for an option.
+         * getOption will return an empty value if the option isn't
+         * set. 
+         */
+        bool hasOption(const std::string& name) const;
+        const token_vector_t& getOption(const std::string& name) const;
+        
+        /** @brief Print the list of configured options.
+         */
+        void printOptions() const;
+        
+        /** @bried Get the error message, if it exists.
+         */
+        const std::string& getErrorMessage() const { return mErrorMsg; }
+        
+        /** @brief Add a custom parser func to the parser.
+         *  
+         * Use this method to add a custom parser for parsing values
+         * the the simple parser may not handle.
+         * it will be applied to each parameter before the
+         * default parser gets a chance.
+         * The parser_func takes an input string, and should return a
+         * name/value pair as the result.
+         */
+        typedef boost::function1<std::pair<std::string, std::string>, const std::string&> parser_func;
+        void setCustomParser(parser_func f) { mExtraParser = f; }
+        
+private:
+        bool parseAndStoreResults(boost::program_options::command_line_parser& clp);
+        std::string mErrorMsg;
+        parser_func mExtraParser;
+};
+
+inline std::ostream& operator<<(std::ostream& out, const LLCommandLineParser& clp)
+{
+    return clp.printOptionsDesc(out);
+}
+
+class LLControlGroup; 
+
+/** 
+ * @class LLControlGroupCLP
+ * @brief Uses the CLP to configure an LLControlGroup
+ *
+ * 
+ */
+class LLControlGroupCLP : public LLCommandLineParser
+{
+public:
+        /**
+         * @brief Configure the command line parser according the given config file.
+         *
+         * @param config_filename The name of the XML based LLSD config file. 
+         * @param clp A reference to the command line parser object to configure.
+         *
+         * *FIX:Mani Specify config file format.
+         */
+        void configure(const LLString& config_filename, 
+                                   LLControlGroup* controlGroup);
+};
+
+#endif // LL_LLCOMMANDLINEPARSER_H