src/gromacs/commandline/cmdlinehelpcontext.h

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  35 /*! \libinternal \file
  36  * \brief
  37  * Declares gmx::CommandLineHelpContext.
  38  *
  39  * \author Teemu Murtola <teemu.murtola@gmail.com>
  40  * \inlibraryapi
  41  * \ingroup module_commandline
  42  */
  43 #ifndef GMX_COMMANDLINE_CMDLINEHELPCONTEXT_H
  44 #define GMX_COMMANDLINE_CMDLINEHELPCONTEXT_H
  45
  46 #include "../onlinehelp/helpwritercontext.h"
  47 #include "../utility/common.h"
  48
  49 namespace gmx
  50 {
  51
  52 /*! \libinternal \brief
  53  * Context information for writing out command-line help.
  54  *
  55  * This class wraps a HelpWriterContext, extending it with information specific
  56  * for command-line help export.  This way, code using only the routines in the
  57  * onlinehelp module is not exposed to extra features of the command-line help
  58  * export.
  59  *
  60  * \ingroup module_commandline
  61  */
  62 class CommandLineHelpContext
  63 {
  64     public:
  65         /*! \brief
  66          * Creates the context.
  67          *
  68          * Wraps the constructor of HelpWriterContext.
  69          */
  70         CommandLineHelpContext(File *file, HelpOutputFormat format);
  71         ~CommandLineHelpContext();
  72
  73         /*! \brief
  74          * Sets a display name for the module for which help is being written.
  75          *
  76          * \throws std::bad_alloc if out of memory.
  77          */
  78         void setModuleDisplayName(const std::string &name);
  79
  80         //! Returns the lower-level context for writing the help.
  81         const HelpWriterContext &writerContext() const;
  82         /*! \brief
  83          * Returns a display name for the module for which help is being written.
  84          *
  85          * Does not throw.
  86          */
  87         const char *moduleDisplayName() const;
  88
  89     private:
  90         class Impl;
  91
  92         PrivateImplPointer<Impl> impl_;
  93 };
  94
  95 /*! \libinternal \brief
  96  * Helper for passing CommandLineHelpContext into parse_common_args().
  97  *
  98  * This class provides a mechanism to set and retrieve a global
  99  * CommandLineHelpContext object.  It is used to pass this object into
 100  * parse_common_args() from CommandLineModuleManager::runAsMainCMain() through
 101  * the main() function that is not aware of the wrapper binary mechanism.
 102  * It is not thread-safe because in this limited use case, it is always called
 103  * from a single-threaded context.
 104  *
 105  * \inlibraryapi
 106  * \ingroup module_onlinehelp
 107  */
 108 class GlobalCommandLineHelpContext
 109 {
 110     public:
 111         //! Returns the global context, or NULL if not set.
 112         static const CommandLineHelpContext *get();
 113
 114         /*! \brief
 115          * Sets the global context for the scope.
 116          *
 117          * The global context is cleared when this object goes out of scope.
 118          *
 119          * It is an error to have more than one GlobalCommandLineHelpContext
 120          * object in existence at the same time.
 121          */
 122         explicit GlobalCommandLineHelpContext(const CommandLineHelpContext &context);
 123         //! Clears the global context.
 124         ~GlobalCommandLineHelpContext();
 125 };
 126
 127 } // namespace gmx
 128
 129 #endif