103 lines
3.5 KiB
C++
103 lines
3.5 KiB
C++
/* vim: set sw=4 sts=4 et foldmethod=syntax : */
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/** \file
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*
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* Example \ref example_repository.cc "example_repository.cc" .
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*
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* \ingroup g_repository
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*/
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/** \example example_repository.cc
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*
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* This example demonstrates how to use Repository.
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*/
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#include <paludis/paludis.hh>
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#include "example_command_line.hh"
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#include <iostream>
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#include <iomanip>
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#include <cstdlib>
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using namespace paludis;
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using namespace examples;
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using std::cout;
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using std::endl;
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using std::left;
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using std::setw;
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int main(int argc, char * argv[])
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{
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int exit_status(0);
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try
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{
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CommandLine::get_instance()->run(argc, argv,
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"example_environment", "EXAMPLE_ENVIRONMENT_OPTIONS", "EXAMPLE_ENVIRONMENT_CMDLINE");
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/* We start with an Environment, respecting the user's '--environment' choice. */
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std::shared_ptr<Environment> env(EnvironmentFactory::get_instance()->create(
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CommandLine::get_instance()->a_environment.argument()));
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/* For each repository... */
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for (auto r(env->begin_repositories()), r_end(env->end_repositories()) ;
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r != r_end ; ++r)
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{
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/* A repository is identified by its name. */
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cout << left << (*r)->name() << ":" << endl;
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/* Like a PackageID, a Repository has metadata. Usually metadata
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* keys will be available for all of the configuration options for
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* that repository; some repositories also provide more (ebuild
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* format repositories, for example, provide info_pkgs too). See
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* \ref example_metadata_key.cc "example_metadata_key.cc" for how to
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* display a metadata key in detail. */
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cout << left << setw(30) << " Metadata keys:" << endl;
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for (Repository::MetadataConstIterator k((*r)->begin_metadata()), k_end((*r)->end_metadata()) ;
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k != k_end ; ++k)
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cout << " " << (*k)->human_name() << endl;
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/* Repositories support various methods for querying categories,
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* packages, IDs and so on. These methods are used by
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* Environment::operator[], but are also sometimes of direct use to
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* clients. */
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std::shared_ptr<const CategoryNamePartSet> cats((*r)->category_names({ }));
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cout << left << setw(30) << " Number of categories:" << " " << cats->size() << endl;
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std::shared_ptr<const PackageIDSequence> ids((*r)->package_ids(QualifiedPackageName("sys-apps/paludis"), { }));
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cout << left << setw(30) << " IDs for sys-apps/paludis:" << " " <<
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join(indirect_iterator(ids->begin()), indirect_iterator(ids->end()), " ") << endl;
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cout << endl;
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}
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}
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catch (const Exception & e)
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{
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/* Paludis exceptions can provide a handy human-readable backtrace and
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* an explanation message. Where possible, these should be displayed. */
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cout << endl;
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cout << "Unhandled exception:" << endl
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<< " * " << e.backtrace("\n * ")
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<< e.message() << " (" << e.what() << ")" << endl;
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return EXIT_FAILURE;
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}
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catch (const std::exception & e)
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{
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cout << endl;
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cout << "Unhandled exception:" << endl
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<< " * " << e.what() << endl;
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return EXIT_FAILURE;
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}
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catch (...)
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{
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cout << endl;
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cout << "Unhandled exception:" << endl
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<< " * Unknown exception type. Ouch..." << endl;
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return EXIT_FAILURE;
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}
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return exit_status;
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}
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