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35 /*! \libinternal \file
37 * Declares gmx::CommandLineModuleManager.
39 * \author Teemu Murtola <teemu.murtola@gmail.com>
41 * \ingroup module_commandline
43 #ifndef GMX_COMMANDLINE_CMDLINEMODULEMANAGER_H
44 #define GMX_COMMANDLINE_CMDLINEMODULEMANAGER_H
46 #include "../onlinehelp/helptopicinterface.h"
47 #include "../utility/common.h"
48 #include "../utility/uniqueptr.h"
53 class CommandLineModuleGroup;
54 class CommandLineModuleGroupData;
55 class CommandLineModuleInterface;
56 class CommandLineProgramContext;
58 //! \addtogroup module_commandline
61 //! Smart pointer type for managing a CommandLineModuleInterface.
62 typedef gmx_unique_ptr<CommandLineModuleInterface>::type
63 CommandLineModulePointer;
65 /*! \libinternal \brief
66 * Implements a wrapper command-line interface for multiple modules.
70 int main(int argc, char *argv[])
72 gmx::CommandLineProgramContext &programContext = gmx::initForCommandLine(&argc, &argv);
75 gmx::CommandLineModuleManager manager("gmx", &programContext);
76 // <register all necessary modules>
77 int rc = manager.run(argc, argv);
78 gmx::finalizeForCommandLine();
81 catch (const std::exception &ex)
83 gmx::printFatalErrorMessage(stderr, ex);
84 return gmx::processExceptionAtExit(ex);
89 * \see page_wrapperbinary
92 class CommandLineModuleManager
95 //! Function pointer type for a C main function.
96 typedef int (*CMainFunction)(int argc, char *argv[]);
99 * Implements a main() method that runs a single module.
101 * \param argc \c argc passed to main().
102 * \param argv \c argv passed to main().
103 * \param module Module to run.
105 * This method allows for uniform behavior for binaries that only
106 * contain a single module without duplicating any of the
107 * implementation from CommandLineModuleManager (startup headers,
108 * common options etc.).
110 * The signature assumes that \p module construction does not throw
111 * (because otherwise the caller would need to duplicate all the
112 * exception handling code). It is possible to move the construction
113 * inside the try/catch in this method using an indirection similar to
114 * TrajectoryAnalysisCommandLineRunner::runAsMain(), but until that is
115 * necessary, the current approach leads to simpler code.
119 int main(int argc, char *argv[])
121 CustomCommandLineModule module;
122 return gmx::CommandLineModuleManager::runAsMainSingleModule(argc, argv, &module);
126 * Does not throw. All exceptions are caught and handled internally.
128 static int runAsMainSingleModule(int argc, char *argv[],
129 CommandLineModuleInterface *module);
131 * Implements a main() method that runs a given function.
133 * \param argc \c argc passed to main().
134 * \param argv \c argv passed to main().
135 * \param mainFunction The main()-like method to wrap.
137 * This method creates a dummy command-line module that does its
138 * processing by calling \p mainFunction; see addModuleCMain() for
139 * details. It then runs this module with runAsMainSingleModule().
140 * This allows the resulting executable to handle common options and do
141 * other common actions (e.g., startup headers) without duplicate code
142 * in the main methods.
146 int my_main(int argc, char *argv[])
151 int main(int argc, char *argv[])
153 return gmx::CommandLineModuleManager::runAsMainCMain(argc, argv, &my_main);
157 * Does not throw. All exceptions are caught and handled internally.
159 static int runAsMainCMain(int argc, char *argv[],
160 CMainFunction mainFunction);
163 * Initializes a command-line module manager.
165 * \param[in] binaryName Name of the running binary
166 * (without Gromacs binary suffix or .exe on Windows).
167 * \param programContext Program information for the running binary.
168 * \throws std::bad_alloc if out of memory.
170 * \p binaryName is used to detect when the binary is run through a
171 * symlink, and automatically invoke a matching module in such a case.
173 * \p programInfo is non-const to allow the manager to amend it based
174 * on the actual module that is getting executed.
176 CommandLineModuleManager(const char *binaryName,
177 CommandLineProgramContext *programContext);
178 ~CommandLineModuleManager();
181 * Sets the module manager to quiet mode: don't print anything.
183 * \param[in] bQuiet Whether the module manager should remain silent.
185 * Normally, the module manager prints out some information to stderr
186 * before it starts the module and after it finishes. This removes
187 * that output, which is useful in particular for unit tests so that
188 * they don't spam stderr.
190 void setQuiet(bool bQuiet);
193 * Makes the manager always run a single module.
195 * \param module Module to run.
197 * This method disables all mechanisms for selecting a module, and
198 * directly passes all command-line arguments to \p module.
199 * Help arguments are an exception: these are still recognized by the
200 * manager and translated into a call to
201 * CommandLineModuleInterface::writeHelp().
203 * This is public mainly for unit testing purposes; for other code,
204 * runAsMainSingleModule() typically provides the desired
209 void setSingleModule(CommandLineModuleInterface *module);
211 * Adds a given module to this manager.
213 * \param module Module to add.
214 * \throws std::bad_alloc if out of memory.
216 * The manager takes ownership of the object.
218 * This method is public mostly for testing purposes; for typical uses,
219 * registerModule() is a more convenient way of adding modules.
221 * \see registerModule()
223 void addModule(CommandLineModulePointer module);
225 * Adds a module that runs a given main()-like function.
227 * \param[in] name Name for the module.
228 * \param[in] shortDescription One-line description for the module.
229 * \param[in] mainFunction Main function to wrap.
230 * \throws std::bad_alloc if out of memory.
232 * There is normally no need to call this method outside the Gromacs
233 * library. User code usually wants to use runAsMainCMain().
235 * \p name and \p shortDescription should be string constants, or the
236 * caller should otherwise ensure that they stay in scope for the
237 * duration the CommandLineModuleManager object exists.
238 * \p mainFunction should call parse_common_args() to process its
239 * command-line arguments.
241 void addModuleCMain(const char *name, const char *shortDescription,
242 CMainFunction mainFunction);
244 * Registers a module of a certain type to this manager.
246 * \tparam Module Type of module to register.
247 * \throws std::bad_alloc if out of memory.
249 * \p Module must be default-constructible and implement
250 * CommandLineModuleInterface.
252 * This method is provided as a convenient alternative to addModule()
253 * for cases where each module is implemented by a different type
254 * (which should be the case for typical situations outside unit
257 template <class Module>
258 void registerModule()
260 addModule(CommandLineModulePointer(new Module));
264 * Adds a group for modules to use in help output.
266 * \param[in] title Short title for the group.
267 * \returns Handle that can be used to add modules to the group.
268 * \throws std::bad_alloc if out of memory.
270 * Creates a group that is used to structure the list of all modules in
271 * help output. Modules are added to the group using the returned
274 CommandLineModuleGroup addModuleGroup(const char *title);
277 * Makes given help topic available through the manager's help module.
279 * \param[in] topic Help topic to add.
280 * \throws std::bad_alloc if out of memory.
282 * The manager takes ownership of the help topic.
284 void addHelpTopic(HelpTopicPointer topic);
287 * Runs a module based on given command line.
289 * \param[in] argc Number of elements in \p argv.
290 * \param[in] argv Command-line arguments.
291 * \throws unspecified Throws any exception that the selected module
293 * \returns Exit code for the program.
294 * \retval 0 on successful termination.
295 * \retval 2 if no module is specified, or if the module is not found.
297 * Runs the module whose name matches \p argv[1].
299 int run(int argc, char *argv[]);
304 PrivateImplPointer<Impl> impl_;
307 /*! \libinternal \brief
308 * Handle to add content to a group added with
309 * CommandLineModuleManager::addModuleGroup().
311 * This class only provides a public interface to construct a module group for
312 * CommandLineModuleManager, and has semantics similar to a pointer: copies all
313 * point to the same group. The actual state of the group is maintained in an
314 * internal implementation class.
318 class CommandLineModuleGroup
321 /*! \cond internal */
322 //! Shorthand for the implementation type that holds all the data.
323 typedef CommandLineModuleGroupData Impl;
325 //! Creates a new group (only called by CommandLineModuleManager).
326 explicit CommandLineModuleGroup(Impl *impl) : impl_(impl) {}
330 * Adds a module to this group.
332 * \param[in] name Name of the module.
333 * \throws std::bad_alloc if out of memory.
335 * This works as addModuleWithDescription(), but uses the short
336 * description of the module itself as the description.
338 * \see addModuleWithDescription()
340 void addModule(const char *name);
342 * Adds a module to this group with a custom description.
344 * \param[in] name Name of the module.
345 * \param[in] description Description of the module in this group.
346 * \throws std::bad_alloc if out of memory.
348 * \p name must name a module added into the CommandLineModuleManager.
349 * It is possible to add the same module into multiple groups.
351 void addModuleWithDescription(const char *name, const char *description);
354 //! Pointer to the data owned by CommandLineModuleManager.