src/gromacs/commandline/cmdlinehelpmodule.cpp

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  35 /*! \internal \file
  36  * \brief
  37  * Implements gmx::CommandLineHelpModule.
  38  *
  39  * \author Teemu Murtola <teemu.murtola@gmail.com>
  40  * \ingroup module_commandline
  41  */
  42 #include "gromacs/commandline/cmdlinehelpmodule.h"
  43
  44 #include <algorithm>
  45 #include <string>
  46 #include <vector>
  47
  48 #include <boost/scoped_ptr.hpp>
  49
  50 #include "gromacs/commandline/cmdlinehelpcontext.h"
  51 #include "gromacs/commandline/cmdlinehelpwriter.h"
  52 #include "gromacs/commandline/cmdlineparser.h"
  53 #include "gromacs/commandline/shellcompletions.h"
  54 #include "gromacs/onlinehelp/helpformat.h"
  55 #include "gromacs/onlinehelp/helpmanager.h"
  56 #include "gromacs/onlinehelp/helptopic.h"
  57 #include "gromacs/onlinehelp/helpwritercontext.h"
  58 #include "gromacs/options/basicoptions.h"
  59 #include "gromacs/options/options.h"
  60 #include "gromacs/utility/baseversion.h"
  61 #include "gromacs/utility/exceptions.h"
  62 #include "gromacs/utility/file.h"
  63 #include "gromacs/utility/gmxassert.h"
  64 #include "gromacs/utility/programcontext.h"
  65 #include "gromacs/utility/stringutil.h"
  66
  67 namespace gmx
  68 {
  69
  70 namespace
  71 {
  72 class HelpExportInterface;
  73 class RootHelpTopic;
  74 }   // namespace
  75
  76 /********************************************************************
  77  * CommandLineHelpModuleImpl declaration
  78  */
  79
  80 class CommandLineHelpModuleImpl
  81 {
  82     public:
  83         CommandLineHelpModuleImpl(const ProgramContextInterface    &programContext,
  84                                   const std::string                &binaryName,
  85                                   const CommandLineModuleMap       &modules,
  86                                   const CommandLineModuleGroupList &groups);
  87
  88         void exportHelp(HelpExportInterface *exporter) const;
  89
  90         boost::scoped_ptr<RootHelpTopic>  rootTopic_;
  91         const ProgramContextInterface    &programContext_;
  92         std::string                       binaryName_;
  93         const CommandLineModuleMap       &modules_;
  94         const CommandLineModuleGroupList &groups_;
  95
  96         CommandLineHelpContext           *context_;
  97         const CommandLineModuleInterface *moduleOverride_;
  98         bool                              bHidden_;
  99
 100         File                             *outputOverride_;
 101
 102         GMX_DISALLOW_COPY_AND_ASSIGN(CommandLineHelpModuleImpl);
 103 };
 104
 105 namespace
 106 {
 107
 108 /********************************************************************
 109  * RootHelpTopic
 110  */
 111
 112 struct RootHelpText
 113 {
 114     static const char        name[];
 115     static const char        title[];
 116     static const char *const text[];
 117 };
 118
 119 // The first two are not used.
 120 const char        RootHelpText::name[]  = "";
 121 const char        RootHelpText::title[] = "";
 122 const char *const RootHelpText::text[]  = { "" };
 123
 124 /*! \brief
 125  * Help topic that forms the root of the help tree for the help subcommand.
 126  *
 127  * \ingroup module_commandline
 128  */
 129 class RootHelpTopic : public CompositeHelpTopic<RootHelpText>
 130 {
 131     public:
 132         /*! \brief
 133          * Creates a root help topic.
 134          *
 135          * Does not throw.
 136          */
 137         explicit RootHelpTopic(const std::string &binaryName)
 138             : binaryName_(binaryName)
 139         {
 140         }
 141
 142         virtual void writeHelp(const HelpWriterContext &context) const;
 143
 144     private:
 145         std::string                 binaryName_;
 146
 147         GMX_DISALLOW_COPY_AND_ASSIGN(RootHelpTopic);
 148 };
 149
 150 void RootHelpTopic::writeHelp(const HelpWriterContext &context) const
 151 {
 152     if (context.outputFormat() != eHelpOutputFormat_Console)
 153     {
 154         // TODO: Implement once the situation with Redmine issue #969 is more
 155         // clear.
 156         GMX_THROW(NotImplementedError(
 157                           "Root help is not implemented for this output format"));
 158     }
 159     {
 160         CommandLineCommonOptionsHolder optionsHolder;
 161         CommandLineHelpContext         cmdlineContext(context);
 162         optionsHolder.initOptions();
 163         cmdlineContext.setModuleDisplayName(binaryName_);
 164         // TODO: Add <command> [<args>] into the synopsis.
 165         // TODO: Propagate the -hidden option here.
 166         CommandLineHelpWriter(*optionsHolder.options())
 167             .writeHelp(cmdlineContext);
 168     }
 169     // TODO: Consider printing a list of "core" commands. Would require someone
 170     // to determine such a set...
 171     writeSubTopicList(context,
 172                       "Additional help is available on the following topics:");
 173     context.writeTextBlock(
 174             "To access the help, use '[PROGRAM] help <topic>'.[BR]"
 175             "For help on a command, use '[PROGRAM] help <command>'.");
 176 }
 177
 178 /********************************************************************
 179  * CommandsHelpTopic
 180  */
 181
 182 /*! \brief
 183  * Help topic for listing the commands.
 184  *
 185  * \ingroup module_commandline
 186  */
 187 class CommandsHelpTopic : public HelpTopicInterface
 188 {
 189     public:
 190         /*! \brief
 191          * Creates a command list help topic.
 192          *
 193          * \param[in]     helpModule Help module to get module information from.
 194          *
 195          * Does not throw.
 196          */
 197         explicit CommandsHelpTopic(const CommandLineHelpModuleImpl &helpModule)
 198             : helpModule_(helpModule)
 199         {
 200         }
 201
 202         virtual const char *name() const { return "commands"; }
 203         virtual const char *title() const { return "List of available commands"; }
 204         virtual bool hasSubTopics() const { return false; }
 205         virtual const HelpTopicInterface *findSubTopic(const char * /*name*/) const
 206         {
 207             return NULL;
 208         }
 209
 210         virtual void writeHelp(const HelpWriterContext &context) const;
 211
 212     private:
 213         const CommandLineHelpModuleImpl &helpModule_;
 214
 215         GMX_DISALLOW_COPY_AND_ASSIGN(CommandsHelpTopic);
 216 };
 217
 218 void CommandsHelpTopic::writeHelp(const HelpWriterContext &context) const
 219 {
 220     if (context.outputFormat() != eHelpOutputFormat_Console)
 221     {
 222         GMX_THROW(NotImplementedError(
 223                           "Module list is not implemented for this output format"));
 224     }
 225     int maxNameLength = 0;
 226     const CommandLineModuleMap           &modules = helpModule_.modules_;
 227     CommandLineModuleMap::const_iterator  module;
 228     for (module = modules.begin(); module != modules.end(); ++module)
 229     {
 230         int nameLength = static_cast<int>(module->first.length());
 231         if (module->second->shortDescription() != NULL
 232             && nameLength > maxNameLength)
 233         {
 234             maxNameLength = nameLength;
 235         }
 236     }
 237     context.writeTextBlock(
 238             "Usage: [PROGRAM] [<options>] <command> [<args>][PAR]"
 239             "Available commands:");
 240     File              &file = context.outputFile();
 241     TextTableFormatter formatter;
 242     formatter.addColumn(NULL, maxNameLength + 1, false);
 243     formatter.addColumn(NULL, 72 - maxNameLength, true);
 244     formatter.setFirstColumnIndent(4);
 245     for (module = modules.begin(); module != modules.end(); ++module)
 246     {
 247         const char *name        = module->first.c_str();
 248         const char *description = module->second->shortDescription();
 249         if (description != NULL)
 250         {
 251             formatter.clear();
 252             formatter.addColumnLine(0, name);
 253             formatter.addColumnLine(1, description);
 254             file.writeString(formatter.formatRow());
 255         }
 256     }
 257     context.writeTextBlock(
 258             "For help on a command, use '[PROGRAM] help <command>'.");
 259 }
 260
 261 /********************************************************************
 262  * ModuleHelpTopic
 263  */
 264
 265 /*! \brief
 266  * Help topic wrapper for a command-line module.
 267  *
 268  * This class implements HelpTopicInterface such that it wraps a
 269  * CommandLineModuleInterface, allowing subcommand "help <command>"
 270  * to produce the help for "<command>".
 271  *
 272  * \ingroup module_commandline
 273  */
 274 class ModuleHelpTopic : public HelpTopicInterface
 275 {
 276     public:
 277         //! Constructs a help topic for a specific module.
 278         ModuleHelpTopic(const CommandLineModuleInterface &module,
 279                         const CommandLineHelpModuleImpl  &helpModule)
 280             : module_(module), helpModule_(helpModule)
 281         {
 282         }
 283
 284         virtual const char *name() const { return module_.name(); }
 285         virtual const char *title() const { return NULL; }
 286         virtual bool hasSubTopics() const { return false; }
 287         virtual const HelpTopicInterface *findSubTopic(const char * /*name*/) const
 288         {
 289             return NULL;
 290         }
 291         virtual void writeHelp(const HelpWriterContext &context) const;
 292
 293     private:
 294         const CommandLineModuleInterface &module_;
 295         const CommandLineHelpModuleImpl  &helpModule_;
 296
 297         GMX_DISALLOW_COPY_AND_ASSIGN(ModuleHelpTopic);
 298 };
 299
 300 void ModuleHelpTopic::writeHelp(const HelpWriterContext & /*context*/) const
 301 {
 302     CommandLineHelpContext context(*helpModule_.context_);
 303     const char *const      program = helpModule_.binaryName_.c_str();
 304     context.setModuleDisplayName(formatString("%s %s", program, module_.name()));
 305     module_.writeHelp(context);
 306 }
 307
 308 /********************************************************************
 309  * HelpExportInterface
 310  */
 311
 312 /*! \brief
 313  * Callbacks for exporting help information for command-line modules.
 314  *
 315  * \ingroup module_commandline
 316  */
 317 class HelpExportInterface
 318 {
 319     public:
 320         //! Shorthand for a list of modules contained in a group.
 321         typedef CommandLineModuleGroupData::ModuleList ModuleGroupContents;
 322
 323         virtual ~HelpExportInterface() {};
 324
 325         /*! \brief
 326          * Called once before exporting individual modules.
 327          *
 328          * Can, e.g., open shared output files (e.g., if the output is written
 329          * into a single file, or if a separate index is required) and write
 330          * headers into them.
 331          */
 332         virtual void startModuleExport() = 0;
 333         /*! \brief
 334          * Called to export the help for each module.
 335          *
 336          * \param[in] module      Module for which the help should be exported.
 337          * \param[in] tag         Unique tag for the module (gmx-something).
 338          * \param[in] displayName Display name for the module (gmx something).
 339          */
 340         virtual void exportModuleHelp(
 341             const CommandLineModuleInterface &module,
 342             const std::string                &tag,
 343             const std::string                &displayName) = 0;
 344         /*! \brief
 345          * Called after all modules have been exported.
 346          *
 347          * Can close files opened in startModuleExport(), write footers to them
 348          * etc.
 349          */
 350         virtual void finishModuleExport() = 0;
 351
 352         /*! \brief
 353          * Called once before exporting module groups.
 354          *
 355          * Can, e.g., open a single output file for listing all the groups.
 356          */
 357         virtual void startModuleGroupExport() = 0;
 358         /*! \brief
 359          * Called to export the help for each module group.
 360          *
 361          * \param[in] title    Title for the group.
 362          * \param[in] modules  List of modules in the group.
 363          */
 364         virtual void exportModuleGroup(const char                *title,
 365                                        const ModuleGroupContents &modules) = 0;
 366         /*! \brief
 367          * Called after all module groups have been exported.
 368          *
 369          * Can close files opened in startModuleGroupExport(), write footers to them
 370          * etc.
 371          */
 372         virtual void finishModuleGroupExport() = 0;
 373 };
 374
 375 /*! \internal \brief
 376  * Adds hyperlinks to modules within this binary.
 377  *
 378  * \param[in,out] links      Links are added here.
 379  * \param[in]     helpModule Help module to get module information from.
 380  * \throws        std::bad_alloc if out of memory.
 381  *
 382  * Initializes a HelpLinks object with links to modules defined in
 383  * \p helpModule.
 384  *
 385  * \ingroup module_commandline
 386  */
 387 void initProgramLinks(HelpLinks *links, const CommandLineHelpModuleImpl &helpModule)
 388 {
 389     const char *const                    program = helpModule.binaryName_.c_str();
 390     CommandLineModuleMap::const_iterator module;
 391     for (module = helpModule.modules_.begin();
 392          module != helpModule.modules_.end();
 393          ++module)
 394     {
 395         if (module->second->shortDescription() != NULL)
 396         {
 397             std::string linkName("[gmx-" + module->first + "]");
 398             std::string targetName(
 399                     formatString("%s-%s", program, module->first.c_str()));
 400             std::string displayName(
 401                     formatString("[TT]%s %s[tt]", program, module->first.c_str()));
 402             links->addLink(linkName, targetName, displayName);
 403         }
 404     }
 405 }
 406
 407 /********************************************************************
 408  * HelpExportMan
 409  */
 410
 411 /*! \internal \brief
 412  * Implements export for man pages.
 413  *
 414  * \ingroup module_commandline
 415  */
 416 class HelpExportMan : public HelpExportInterface
 417 {
 418     public:
 419         //! Initializes man page exporter.
 420         explicit HelpExportMan(const CommandLineHelpModuleImpl &helpModule)
 421             : links_(eHelpOutputFormat_Man)
 422         {
 423             initProgramLinks(&links_, helpModule);
 424         }
 425
 426         virtual void startModuleExport() {}
 427         virtual void exportModuleHelp(
 428             const CommandLineModuleInterface &module,
 429             const std::string                &tag,
 430             const std::string                &displayName);
 431         virtual void finishModuleExport() {}
 432
 433         virtual void startModuleGroupExport();
 434         virtual void exportModuleGroup(const char                *title,
 435                                        const ModuleGroupContents &modules);
 436         virtual void finishModuleGroupExport();
 437
 438     private:
 439         HelpLinks                links_;
 440         boost::scoped_ptr<File>  man7File_;
 441         std::string              man7Footer_;
 442 };
 443
 444 void HelpExportMan::exportModuleHelp(
 445         const CommandLineModuleInterface &module,
 446         const std::string                &tag,
 447         const std::string                &displayName)
 448 {
 449     File file("man1/" + tag + ".1", "w");
 450
 451     // TODO: It would be nice to remove the VERSION prefix from the version
 452     // string to make it shorter.
 453     file.writeLine(formatString(".TH %s 1 \"\" \"%s\" \"GROMACS Manual\"\n",
 454                                 tag.c_str(), gmx_version()));
 455     file.writeLine(".SH NAME");
 456     file.writeLine(formatString("%s - %s", tag.c_str(),
 457                                 module.shortDescription()));
 458     file.writeLine();
 459
 460     CommandLineHelpContext context(&file, eHelpOutputFormat_Man, &links_);
 461     context.setModuleDisplayName(displayName);
 462     module.writeHelp(context);
 463
 464     file.writeLine(".SH SEE ALSO");
 465     file.writeLine(".BR gromacs(7)");
 466     file.writeLine();
 467     file.writeLine("More information about \\fBGROMACS\\fR is available at <\\fIhttp://www.gromacs.org/\\fR>.");
 468 }
 469
 470 void HelpExportMan::startModuleGroupExport()
 471 {
 472     const char *const programListPlaceholder = "@PROGMANPAGES@";
 473
 474     const std::string man7Template = gmx::File::readToString("man7/gromacs.7.in");
 475     const size_t      index        = man7Template.find(programListPlaceholder);
 476     GMX_RELEASE_ASSERT(index != std::string::npos,
 477                        "gromacs.7.in must contain a @PROGMANPAGES@ line");
 478     std::string header = man7Template.substr(0, index);
 479     man7Footer_ = man7Template.substr(index + std::strlen(programListPlaceholder));
 480     header      = replaceAll(header, "@VERSION@", gmx_version());
 481     man7File_.reset(new File("man7/gromacs.7", "w"));
 482     man7File_->writeLine(header);
 483 }
 484
 485 void HelpExportMan::exportModuleGroup(const char                *title,
 486                                       const ModuleGroupContents &modules)
 487 {
 488     man7File_->writeLine(formatString(".Sh \"%s\"", title));
 489     man7File_->writeLine(formatString(".IX Subsection \"%s\"", title));
 490     man7File_->writeLine(".Vb");
 491     man7File_->writeLine(".ta 16n");
 492
 493     ModuleGroupContents::const_iterator module;
 494     for (module = modules.begin(); module != modules.end(); ++module)
 495     {
 496         const std::string &tag(module->first);
 497         man7File_->writeLine(formatString("\\&  %s\t%s",
 498                                           tag.c_str(), module->second));
 499     }
 500
 501     man7File_->writeLine(".Ve");
 502 }
 503
 504 void HelpExportMan::finishModuleGroupExport()
 505 {
 506     man7File_->writeLine(man7Footer_);
 507     man7File_->close();
 508 }
 509
 510 /********************************************************************
 511  * HelpExportHtml
 512  */
 513
 514 /*! \internal \brief
 515  * Implements export for HTML help.
 516  *
 517  * \ingroup module_commandline
 518  */
 519 class HelpExportHtml : public HelpExportInterface
 520 {
 521     public:
 522         //! Initializes HTML exporter.
 523         explicit HelpExportHtml(const CommandLineHelpModuleImpl &helpModule);
 524
 525         virtual void startModuleExport();
 526         virtual void exportModuleHelp(
 527             const CommandLineModuleInterface &module,
 528             const std::string                &tag,
 529             const std::string                &displayName);
 530         virtual void finishModuleExport();
 531
 532         virtual void startModuleGroupExport();
 533         virtual void exportModuleGroup(const char                *title,
 534                                        const ModuleGroupContents &modules);
 535         virtual void finishModuleGroupExport();
 536
 537     private:
 538         void setupHeaderAndFooter();
 539
 540         void writeHtmlHeader(File *file, const std::string &title) const;
 541         void writeHtmlFooter(File *file) const;
 542
 543         HelpLinks                links_;
 544         boost::scoped_ptr<File>  indexFile_;
 545         std::string              header_;
 546         std::string              footer_;
 547 };
 548
 549 HelpExportHtml::HelpExportHtml(const CommandLineHelpModuleImpl &helpModule)
 550     : links_(eHelpOutputFormat_Html)
 551 {
 552     initProgramLinks(&links_, helpModule);
 553     File             linksFile("links.dat", "r");
 554     std::string      line;
 555     while (linksFile.readLine(&line))
 556     {
 557         links_.addLink(line, "../online/" + line, line);
 558     }
 559     linksFile.close();
 560     setupHeaderAndFooter();
 561 }
 562
 563 void HelpExportHtml::setupHeaderAndFooter()
 564 {
 565     header_ = gmx::File::readToString("header.html.in");
 566     header_ = replaceAll(header_, "@VERSION@", gmx_version());
 567     gmx::File::writeFileFromString("header.html", header_);
 568     header_ = replaceAll(header_, "@ROOTPATH@", "../");
 569     footer_ = gmx::File::readToString("footer.html");
 570 }
 571
 572 void HelpExportHtml::startModuleExport()
 573 {
 574     indexFile_.reset(new File("final/programs/byname.html", "w"));
 575     writeHtmlHeader(indexFile_.get(), "GROMACS Programs by Name");
 576     indexFile_->writeLine("<H3>GROMACS Programs Alphabetically</H3>");
 577 }
 578
 579 void HelpExportHtml::exportModuleHelp(
 580         const CommandLineModuleInterface &module,
 581         const std::string                &tag,
 582         const std::string                &displayName)
 583 {
 584     File file("final/programs/" + tag + ".html", "w");
 585     writeHtmlHeader(&file, displayName);
 586
 587     CommandLineHelpContext context(&file, eHelpOutputFormat_Html, &links_);
 588     context.setModuleDisplayName(displayName);
 589     module.writeHelp(context);
 590
 591     writeHtmlFooter(&file);
 592     file.close();
 593
 594     indexFile_->writeLine(formatString("<a href=\"%s.html\">%s</a> - %s<br>",
 595                                        tag.c_str(), displayName.c_str(),
 596                                        module.shortDescription()));
 597 }
 598
 599 void HelpExportHtml::finishModuleExport()
 600 {
 601     writeHtmlFooter(indexFile_.get());
 602     indexFile_->close();
 603 }
 604
 605 void HelpExportHtml::startModuleGroupExport()
 606 {
 607     indexFile_.reset(new File("final/programs/bytopic.html", "w"));
 608     writeHtmlHeader(indexFile_.get(), "GROMACS Programs by Topic");
 609     indexFile_->writeLine("<H3>GROMACS Programs by Topic</H3>");
 610 }
 611
 612 void HelpExportHtml::exportModuleGroup(const char                *title,
 613                                        const ModuleGroupContents &modules)
 614 {
 615     indexFile_->writeLine(formatString("<H4>%s</H4>", title));
 616
 617     ModuleGroupContents::const_iterator module;
 618     for (module = modules.begin(); module != modules.end(); ++module)
 619     {
 620         const std::string     &tag(module->first);
 621         std::string            displayName(tag);
 622         std::replace(displayName.begin(), displayName.end(), '-', ' ');
 623         indexFile_->writeLine(formatString("<a href=\"%s.html\">%s</a> - %s<br>",
 624                                            tag.c_str(), displayName.c_str(),
 625                                            module->second));
 626     }
 627 }
 628
 629 void HelpExportHtml::finishModuleGroupExport()
 630 {
 631     writeHtmlFooter(indexFile_.get());
 632     indexFile_->close();
 633 }
 634
 635 void HelpExportHtml::writeHtmlHeader(File *file, const std::string &title) const
 636 {
 637     file->writeLine(replaceAll(header_, "@TITLE@", title));
 638 }
 639
 640 void HelpExportHtml::writeHtmlFooter(File *file) const
 641 {
 642     file->writeLine(footer_);
 643 }
 644
 645 /********************************************************************
 646  * HelpExportCompletion
 647  */
 648
 649 /*! \internal \brief
 650  * Implements export for command-line completion.
 651  *
 652  * \ingroup module_commandline
 653  */
 654 class HelpExportCompletion : public HelpExportInterface
 655 {
 656     public:
 657         //! Initializes completion exporter.
 658         explicit HelpExportCompletion(const CommandLineHelpModuleImpl &helpModule);
 659
 660         virtual void startModuleExport();
 661         virtual void exportModuleHelp(
 662             const CommandLineModuleInterface &module,
 663             const std::string                &tag,
 664             const std::string                &displayName);
 665         virtual void finishModuleExport();
 666
 667         virtual void startModuleGroupExport() {}
 668         virtual void exportModuleGroup(const char                * /*title*/,
 669                                        const ModuleGroupContents & /*modules*/) {}
 670         virtual void finishModuleGroupExport() {}
 671
 672     private:
 673         ShellCompletionWriter    bashWriter_;
 674         std::vector<std::string> modules_;
 675 };
 676
 677 HelpExportCompletion::HelpExportCompletion(
 678         const CommandLineHelpModuleImpl &helpModule)
 679     : bashWriter_(helpModule.binaryName_, eShellCompletionFormat_Bash)
 680 {
 681 }
 682
 683 void HelpExportCompletion::startModuleExport()
 684 {
 685     bashWriter_.startCompletions();
 686 }
 687
 688 void HelpExportCompletion::exportModuleHelp(
 689         const CommandLineModuleInterface &module,
 690         const std::string                 & /*tag*/,
 691         const std::string                 & /*displayName*/)
 692 {
 693     modules_.push_back(module.name());
 694     {
 695         CommandLineHelpContext context(&bashWriter_);
 696         // We use the display name to pass the name of the module to the
 697         // completion writer.
 698         context.setModuleDisplayName(module.name());
 699         module.writeHelp(context);
 700     }
 701 }
 702
 703 void HelpExportCompletion::finishModuleExport()
 704 {
 705     CommandLineCommonOptionsHolder optionsHolder;
 706     optionsHolder.initOptions();
 707     bashWriter_.writeWrapperCompletions(modules_, *optionsHolder.options());
 708     bashWriter_.finishCompletions();
 709 }
 710
 711 }   // namespace
 712
 713 /********************************************************************
 714  * CommandLineHelpModuleImpl implementation
 715  */
 716 CommandLineHelpModuleImpl::CommandLineHelpModuleImpl(
 717         const ProgramContextInterface    &programContext,
 718         const std::string                &binaryName,
 719         const CommandLineModuleMap       &modules,
 720         const CommandLineModuleGroupList &groups)
 721     : rootTopic_(new RootHelpTopic(binaryName)), programContext_(programContext),
 722       binaryName_(binaryName), modules_(modules), groups_(groups),
 723       context_(NULL), moduleOverride_(NULL), bHidden_(false),
 724       outputOverride_(NULL)
 725 {
 726 }
 727
 728 void CommandLineHelpModuleImpl::exportHelp(HelpExportInterface *exporter) const
 729 {
 730     // TODO: Would be nicer to have the file names supplied by the build system
 731     // and/or export a list of files from here.
 732     const char *const program = binaryName_.c_str();
 733
 734     exporter->startModuleExport();
 735     CommandLineModuleMap::const_iterator module;
 736     for (module = modules_.begin(); module != modules_.end(); ++module)
 737     {
 738         if (module->second->shortDescription() != NULL)
 739         {
 740             const char *const moduleName = module->first.c_str();
 741             std::string       tag(formatString("%s-%s", program, moduleName));
 742             std::string       displayName(tag);
 743             std::replace(displayName.begin(), displayName.end(), '-', ' ');
 744             exporter->exportModuleHelp(*module->second, tag, displayName);
 745         }
 746     }
 747     exporter->finishModuleExport();
 748
 749     exporter->startModuleGroupExport();
 750     CommandLineModuleGroupList::const_iterator group;
 751     for (group = groups_.begin(); group != groups_.end(); ++group)
 752     {
 753         exporter->exportModuleGroup((*group)->title(), (*group)->modules());
 754     }
 755     exporter->finishModuleGroupExport();
 756 }
 757
 758 /********************************************************************
 759  * CommandLineHelpModule
 760  */
 761
 762 CommandLineHelpModule::CommandLineHelpModule(
 763         const ProgramContextInterface    &programContext,
 764         const std::string                &binaryName,
 765         const CommandLineModuleMap       &modules,
 766         const CommandLineModuleGroupList &groups)
 767     : impl_(new Impl(programContext, binaryName, modules, groups))
 768 {
 769 }
 770
 771 CommandLineHelpModule::~CommandLineHelpModule()
 772 {
 773 }
 774
 775 HelpTopicPointer CommandLineHelpModule::createModuleHelpTopic(
 776         const CommandLineModuleInterface &module) const
 777 {
 778     return HelpTopicPointer(new ModuleHelpTopic(module, *impl_));
 779 }
 780
 781 void CommandLineHelpModule::addTopic(HelpTopicPointer topic)
 782 {
 783     impl_->rootTopic_->addSubTopic(move(topic));
 784 }
 785
 786 void CommandLineHelpModule::setShowHidden(bool bHidden)
 787 {
 788     impl_->bHidden_ = bHidden;
 789 }
 790
 791 void CommandLineHelpModule::setModuleOverride(
 792         const CommandLineModuleInterface &module)
 793 {
 794     impl_->moduleOverride_ = &module;
 795 }
 796
 797 void CommandLineHelpModule::setOutputRedirect(File *output)
 798 {
 799     impl_->outputOverride_ = output;
 800 }
 801
 802 int CommandLineHelpModule::run(int argc, char *argv[])
 803 {
 804     // Add internal topics lazily here.
 805     addTopic(HelpTopicPointer(new CommandsHelpTopic(*impl_)));
 806
 807     const char *const exportFormats[] = { "man", "html", "completion" };
 808     std::string       exportFormat;
 809     Options           options(NULL, NULL);
 810     options.addOption(StringOption("export").store(&exportFormat)
 811                           .enumValue(exportFormats));
 812     CommandLineParser(&options).parse(&argc, argv);
 813     if (!exportFormat.empty())
 814     {
 815         boost::scoped_ptr<HelpExportInterface> exporter;
 816         if (exportFormat == "man")
 817         {
 818             exporter.reset(new HelpExportMan(*impl_));
 819         }
 820         else if (exportFormat == "html")
 821         {
 822             exporter.reset(new HelpExportHtml(*impl_));
 823         }
 824         else if (exportFormat == "completion")
 825         {
 826             exporter.reset(new HelpExportCompletion(*impl_));
 827         }
 828         else
 829         {
 830             GMX_THROW(NotImplementedError("This help format is not implemented"));
 831         }
 832         impl_->exportHelp(exporter.get());
 833         return 0;
 834     }
 835
 836     File *outputFile = &File::standardOutput();
 837     if (impl_->outputOverride_ != NULL)
 838     {
 839         outputFile = impl_->outputOverride_;
 840     }
 841     HelpLinks                                 links(eHelpOutputFormat_Console);
 842     initProgramLinks(&links, *impl_);
 843     boost::scoped_ptr<CommandLineHelpContext> context(
 844             new CommandLineHelpContext(outputFile,
 845                                        eHelpOutputFormat_Console, &links));
 846     context->setShowHidden(impl_->bHidden_);
 847     if (impl_->moduleOverride_ != NULL)
 848     {
 849         context->setModuleDisplayName(impl_->programContext_.displayName());
 850         impl_->moduleOverride_->writeHelp(*context);
 851         return 0;
 852     }
 853     impl_->context_ = context.get();
 854
 855     HelpManager helpManager(*impl_->rootTopic_, context->writerContext());
 856     try
 857     {
 858         for (int i = 1; i < argc; ++i)
 859         {
 860             helpManager.enterTopic(argv[i]);
 861         }
 862     }
 863     catch (const InvalidInputError &ex)
 864     {
 865         fprintf(stderr, "%s\n", ex.what());
 866         return 2;
 867     }
 868     helpManager.writeCurrentTopic();
 869     return 0;
 870 }
 871
 872 void CommandLineHelpModule::writeHelp(const CommandLineHelpContext &context) const
 873 {
 874     const HelpWriterContext &writerContext = context.writerContext();
 875     // TODO: Implement.
 876     if (writerContext.outputFormat() != eHelpOutputFormat_Console)
 877     {
 878         return;
 879     }
 880     writerContext.writeTextBlock(
 881             "Usage: [PROGRAM] help [<command>|<topic> [<subtopic> [...]]]");
 882     // TODO: More information.
 883 }
 884
 885 } // namespace gmx