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35 /*! \libinternal \file
37 * Declares gmx::CommandLineHelpContext.
39 * \author Teemu Murtola <teemu.murtola@gmail.com>
41 * \ingroup module_commandline
43 #ifndef GMX_COMMANDLINE_CMDLINEHELPCONTEXT_H
44 #define GMX_COMMANDLINE_CMDLINEHELPCONTEXT_H
46 #include "gromacs/onlinehelp/helpwritercontext.h"
47 #include "gromacs/utility/common.h"
52 class ShellCompletionWriter;
54 /*! \libinternal \brief
55 * Context information for writing out command-line help.
57 * This class wraps a HelpWriterContext, extending it with information specific
58 * for command-line help export. This way, code using only the routines in the
59 * onlinehelp module is not exposed to extra features of the command-line help
62 * Copying a context works like with HelpWriterContext: the output file and
63 * most state is shared. However, setModuleDisplayName() and setShowHidden()
64 * can be set independently for the child context. Defaults for these options
65 * are inherited from the parent.
67 * \ingroup module_commandline
69 class CommandLineHelpContext
73 * Creates a context for help export.
75 * Wraps the constructor of HelpWriterContext.
77 CommandLineHelpContext(File *file, HelpOutputFormat format,
78 const HelpLinks *links);
79 //! Creates a context for a particular HelpWriterContext.
80 explicit CommandLineHelpContext(const HelpWriterContext &writerContext);
82 * Creates a context for shell completion.
84 explicit CommandLineHelpContext(ShellCompletionWriter *writer);
85 //! Creates a copy of the context.
86 explicit CommandLineHelpContext(const CommandLineHelpContext &other);
87 ~CommandLineHelpContext();
90 * Sets a display name for the module for which help is being written.
92 * \throws std::bad_alloc if out of memory.
94 void setModuleDisplayName(const std::string &name);
95 //! Sets whether hidden options should be shown in help output.
96 void setShowHidden(bool bHidden);
98 //! Returns the lower-level context for writing the help.
99 const HelpWriterContext &writerContext() const;
101 * Returns a display name for the module for which help is being written.
105 const char *moduleDisplayName() const;
106 //! Returns whether hidden options should be shown in help output.
107 bool showHidden() const;
108 //! Returns whether this context is for exporting shell completions.
109 bool isCompletionExport() const;
111 * Returns the shell completion writer for this context.
113 * Can only be called if isCompletionExport() returns `true`.
115 ShellCompletionWriter &shellCompletionWriter() const;
120 PrivateImplPointer<Impl> impl_;
122 GMX_DISALLOW_ASSIGN(CommandLineHelpContext);
125 /*! \libinternal \brief
126 * Helper for passing CommandLineHelpContext into parse_common_args().
128 * This class provides a mechanism to set and retrieve a global
129 * CommandLineHelpContext object. It is used to pass this object into
130 * parse_common_args() from CommandLineModuleManager::runAsMainCMain() through
131 * the main() function that is not aware of the wrapper binary mechanism.
132 * It is not thread-safe because in this limited use case, it is always called
133 * from a single-threaded context.
136 * \ingroup module_onlinehelp
138 class GlobalCommandLineHelpContext
141 //! Returns the global context, or NULL if not set.
142 static const CommandLineHelpContext *get();
145 * Sets the global context for the scope.
147 * The global context is cleared when this object goes out of scope.
149 * It is an error to have more than one GlobalCommandLineHelpContext
150 * object in existence at the same time.
152 explicit GlobalCommandLineHelpContext(const CommandLineHelpContext &context);
153 //! Clears the global context.
154 ~GlobalCommandLineHelpContext();