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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
49 #include "gromacs/onlinehelp/helpwritercontext.h"
50 #include "gromacs/utility/classhelpers.h"
55 class ShellCompletionWriter;
57 /*! \libinternal \brief
58 * Context information for writing out command-line help.
60 * This class wraps a HelpWriterContext, extending it with information specific
61 * for command-line help export. This way, code using only the routines in the
62 * onlinehelp module is not exposed to extra features of the command-line help
65 * Copying a context works like with HelpWriterContext: the output file and
66 * most state is shared. However, setModuleDisplayName() and setShowHidden()
67 * can be set independently for the child context. Defaults for these options
68 * are inherited from the parent.
70 * \ingroup module_commandline
72 class CommandLineHelpContext
76 * Creates a context for help export.
78 * Wraps the constructor of HelpWriterContext.
80 CommandLineHelpContext(TextWriter* writer,
81 HelpOutputFormat format,
82 const HelpLinks* links,
83 const std::string& programName);
84 //! Creates a context for a particular HelpWriterContext.
85 explicit CommandLineHelpContext(const HelpWriterContext& writerContext);
87 * Creates a context for shell completion.
89 explicit CommandLineHelpContext(ShellCompletionWriter* writer);
90 //! Creates a copy of the context.
91 explicit CommandLineHelpContext(const CommandLineHelpContext& other);
92 //! Moves the context.
93 CommandLineHelpContext(CommandLineHelpContext&& other) noexcept;
94 //! Move-assigns the context.
95 CommandLineHelpContext& operator=(CommandLineHelpContext&& other) noexcept;
96 ~CommandLineHelpContext();
99 * Sets a display name for the module for which help is being written.
101 * \throws std::bad_alloc if out of memory.
103 void setModuleDisplayName(const std::string& name);
104 //! Sets whether hidden options should be shown in help output.
105 void setShowHidden(bool bHidden);
106 //! \copydoc HelpWriterContext::enterSubSection()
107 void enterSubSection(const std::string& title);
109 //! Returns the lower-level context for writing the help.
110 const HelpWriterContext& writerContext() const;
112 * Returns a display name for the module for which help is being written.
116 const char* moduleDisplayName() const;
117 //! Returns whether hidden options should be shown in help output.
118 bool showHidden() const;
119 //! Returns whether this context is for exporting shell completions.
120 bool isCompletionExport() const;
122 * Returns the shell completion writer for this context.
124 * Can only be called if isCompletionExport() returns `true`.
126 ShellCompletionWriter& shellCompletionWriter() const;
131 std::unique_ptr<Impl> impl_;
133 GMX_DISALLOW_ASSIGN(CommandLineHelpContext);
136 /*! \libinternal \brief
137 * Helper for passing CommandLineHelpContext into parse_common_args().
139 * This class provides a mechanism to set and retrieve a global
140 * CommandLineHelpContext object. It is used to pass this object into
141 * parse_common_args() from CommandLineModuleManager::runAsMainCMain() through
142 * the main() function that is not aware of the wrapper binary mechanism.
143 * It is not thread-safe because in this limited use case, it is always called
144 * from a single-threaded context.
147 * \ingroup module_onlinehelp
149 class GlobalCommandLineHelpContext
152 //! Returns the global context, or NULL if not set.
153 static const CommandLineHelpContext* get();
156 * Sets the global context for the scope.
158 * The global context is cleared when this object goes out of scope.
160 * It is an error to have more than one GlobalCommandLineHelpContext
161 * object in existence at the same time.
163 explicit GlobalCommandLineHelpContext(const CommandLineHelpContext& context);
164 //! Clears the global context.
165 ~GlobalCommandLineHelpContext();