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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
48 #include "gromacs/onlinehelp/helpwritercontext.h"
49 #include "gromacs/utility/classhelpers.h"
54 class ShellCompletionWriter;
56 /*! \libinternal \brief
57 * Context information for writing out command-line help.
59 * This class wraps a HelpWriterContext, extending it with information specific
60 * for command-line help export. This way, code using only the routines in the
61 * onlinehelp module is not exposed to extra features of the command-line help
64 * Copying a context works like with HelpWriterContext: the output file and
65 * most state is shared. However, setModuleDisplayName() and setShowHidden()
66 * can be set independently for the child context. Defaults for these options
67 * are inherited from the parent.
69 * \ingroup module_commandline
71 class CommandLineHelpContext
75 * Creates a context for help export.
77 * Wraps the constructor of HelpWriterContext.
79 CommandLineHelpContext(File *file, HelpOutputFormat format,
80 const HelpLinks *links,
81 const std::string &programName);
82 //! Creates a context for a particular HelpWriterContext.
83 explicit CommandLineHelpContext(const HelpWriterContext &writerContext);
85 * Creates a context for shell completion.
87 explicit CommandLineHelpContext(ShellCompletionWriter *writer);
88 //! Creates a copy of the context.
89 explicit CommandLineHelpContext(const CommandLineHelpContext &other);
90 ~CommandLineHelpContext();
93 * Sets a display name for the module for which help is being written.
95 * \throws std::bad_alloc if out of memory.
97 void setModuleDisplayName(const std::string &name);
98 //! Sets whether hidden options should be shown in help output.
99 void setShowHidden(bool bHidden);
100 //! \copydoc HelpWriterContext::enterSubSection()
101 void enterSubSection(const std::string &title);
103 //! Returns the lower-level context for writing the help.
104 const HelpWriterContext &writerContext() const;
106 * Returns a display name for the module for which help is being written.
110 const char *moduleDisplayName() const;
111 //! Returns whether hidden options should be shown in help output.
112 bool showHidden() const;
113 //! Returns whether this context is for exporting shell completions.
114 bool isCompletionExport() const;
116 * Returns the shell completion writer for this context.
118 * Can only be called if isCompletionExport() returns `true`.
120 ShellCompletionWriter &shellCompletionWriter() const;
125 PrivateImplPointer<Impl> impl_;
127 GMX_DISALLOW_ASSIGN(CommandLineHelpContext);
130 /*! \libinternal \brief
131 * Helper for passing CommandLineHelpContext into parse_common_args().
133 * This class provides a mechanism to set and retrieve a global
134 * CommandLineHelpContext object. It is used to pass this object into
135 * parse_common_args() from CommandLineModuleManager::runAsMainCMain() through
136 * the main() function that is not aware of the wrapper binary mechanism.
137 * It is not thread-safe because in this limited use case, it is always called
138 * from a single-threaded context.
141 * \ingroup module_onlinehelp
143 class GlobalCommandLineHelpContext
146 //! Returns the global context, or NULL if not set.
147 static const CommandLineHelpContext *get();
150 * Sets the global context for the scope.
152 * The global context is cleared when this object goes out of scope.
154 * It is an error to have more than one GlobalCommandLineHelpContext
155 * object in existence at the same time.
157 explicit GlobalCommandLineHelpContext(const CommandLineHelpContext &context);
158 //! Clears the global context.
159 ~GlobalCommandLineHelpContext();