src/gromacs/commandline/cmdlinemodule.h

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  35 /*! \file
  36  * \brief
  37  * Declares gmx::ICommandLineModule and supporting classes.
  38  *
  39  * \author Teemu Murtola <teemu.murtola@gmail.com>
  40  * \inpublicapi
  41  * \ingroup module_commandline
  42  */
  43 #ifndef GMX_COMMANDLINE_CMDLINEMODULE_H
  44 #define GMX_COMMANDLINE_CMDLINEMODULE_H
  45
  46 #include "gromacs/utility/classhelpers.h"
  47
  48 namespace gmx
  49 {
  50
  51 class CommandLineHelpContext;
  52
  53 /*! \brief
  54  * Settings to pass information between a module and the general runner.
  55  *
  56  * Methods in this class do not throw, except that construction may throw
  57  * std::bad_alloc.
  58  *
  59  * \inpublicapi
  60  * \ingroup module_commandline
  61  */
  62 class CommandLineModuleSettings
  63 {
  64     public:
  65         CommandLineModuleSettings();
  66         ~CommandLineModuleSettings();
  67
  68         //! Returns the default nice level for this module.
  69         int defaultNiceLevel() const;
  70
  71         /*! \brief
  72          * Sets the default nice level for this module.
  73          *
  74          * If not called, the module will be niced.
  75          */
  76         void setDefaultNiceLevel(int niceLevel);
  77
  78     private:
  79         class Impl;
  80
  81         PrivateImplPointer<Impl> impl_;
  82 };
  83
  84 /*! \brief
  85  * Module that can be run from command line using CommandLineModuleManager.
  86  *
  87  * \see CommandLineModuleManager
  88  * \see CommandLineOptionsModule
  89  *
  90  * \inpublicapi
  91  * \ingroup module_commandline
  92  */
  93 class ICommandLineModule
  94 {
  95     public:
  96         virtual ~ICommandLineModule() {}
  97
  98         //! Returns the name of the module.
  99         virtual const char *name() const = 0;
 100         //! Returns a one-line description of the module.
 101         virtual const char *shortDescription() const = 0;
 102
 103         /*! \brief
 104          * Initializes the module and provides settings for the runner.
 105          *
 106          * This will be called before run(), and can be used to adjust
 107          * initialization that the runner does.
 108          *
 109          * This method is currently not called when writing the help.
 110          */
 111         virtual void init(CommandLineModuleSettings *settings) = 0;
 112         /*! \brief
 113          * Runs the module with the given arguments.
 114          *
 115          * \param[in] argc  Number of elements in \p argv.
 116          * \param[in] argv  Command-line arguments.
 117          * \throws   unspecified  May throw exceptions to indicate errors.
 118          * \returns  Exit code for the program.
 119          * \retval   0 on successful termination.
 120          *
 121          * \p argv[0] is the name of the module, i.e., the arguments are as if
 122          * the module was run as a standalone executable.
 123          */
 124         virtual int run(int argc, char *argv[]) = 0;
 125         /*! \brief
 126          * Prints help for the module.
 127          *
 128          * \param[in] context  Context object for writing the help.
 129          * \throws    std::bad_alloc if out of memory.
 130          * \throws    FileIOError on any I/O error.
 131          *
 132          * Note that for MPI-enabled builds, this is called only on the master
 133          * rank.
 134          */
 135         virtual void writeHelp(const CommandLineHelpContext &context) const = 0;
 136 };
 137
 138 //! \cond libapi
 139 /*! \libinternal \brief
 140  * Helper to implement ICommandLineModule::writeHelp() with a C-like
 141  * main() function that calls parse_common_args().
 142  *
 143  * \param[in] context      Context object for writing the help.
 144  * \param[in] name         Name of the module.
 145  * \param[in] mainFunction C-like main() function that calls parse_common_args().
 146  *
 147  * \ingroup module_commandline
 148  */
 149 void writeCommandLineHelpCMain(
 150         const CommandLineHelpContext &context, const char *name,
 151         int (*mainFunction)(int argc, char *argv[]));
 152 //! \endcond
 153
 154 } // namespace gmx
 155
 156 #endif