101 lines
3.2 KiB
C++
101 lines
3.2 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_match_package.cc "example_match_package.cc" .
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*
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* \ingroup g_query
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*/
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/** \example example_match_package.cc
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*
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* This example demonstrates how to use paludis::match_package and
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* paludis::match_package_in_set.
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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_match_package", "EXAMPLE_MATCH_PACKAGE_OPTIONS", "EXAMPLE_MATCH_PACKAGE_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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/* Fetch all installed packages. */
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std::shared_ptr<const PackageIDSequence> ids((*env)[selection::AllVersionsSorted(
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generator::All() |
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filter::InstalledAtSlash())]);
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/* Fetch the 'system' and 'world' sets. Ordinarily we should check for
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* zero pointers here, but these two sets will always exist. */
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std::shared_ptr<const SetSpecTree> system(env->set(SetName("system"))),
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world(env->set(SetName("world")));
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/* For each ID: */
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for (PackageIDSequence::ConstIterator i(ids->begin()), i_end(ids->end()) ;
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i != i_end ; ++i)
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{
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/* Is it paludis? */
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if (match_package(*env, make_package_dep_spec({ }).package(
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QualifiedPackageName("sys-apps/paludis")), *i, nullptr, { }))
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cout << left << setw(50) << (stringify(**i) + ":") << " " << "paludis" << endl;
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/* No. Is it in system or world? */
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else if (match_package_in_set(*env, *system, *i, { }))
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cout << left << setw(50) << (stringify(**i) + ":") << " " << "system" << endl;
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else if (match_package_in_set(*env, *world, *i, { }))
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cout << left << setw(50) << (stringify(**i) + ":") << " " << "world" << endl;
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else
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cout << left << setw(50) << (stringify(**i) + ":") << " " << "nothing" << 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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