118 lines
4.0 KiB
C++
118 lines
4.0 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_dep_spec_flattener.cc "example_dep_spec_flattener.cc" .
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*
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* \ingroup g_dep_spec
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*/
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/** \example example_dep_spec_flattener.cc
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*
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* This example demonstrates how to use DepSpecFlattener. It extracts various
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* metadata items from a package.
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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 <algorithm>
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#include <cstdlib>
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#include <set>
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#include <map>
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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::setw;
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using std::left;
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int main(int argc, char * argv[])
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{
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try
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{
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CommandLine::get_instance()->run(argc, argv,
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"example_dep_spec_flattener", "EXAMPLE_DEP_SPEC_FLATTENER_OPTIONS", "EXAMPLE_DEP_SPEC_FLATTENER_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 package IDs for 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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/* 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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cout << "Information about '" << **i << "':" << endl;
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/* Do we have a homepage? All PackageID key methods may return a
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* null pointer. */
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if ((*i)->homepage_key())
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{
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DepSpecFlattener<SimpleURISpecTree, SimpleURIDepSpec> homepages(env.get(), *i);
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(*i)->homepage_key()->parse_value()->top()->accept(homepages);
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cout << " " << left << setw(24) << "Homepages:" << " "
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<< join(indirect_iterator(homepages.begin()), indirect_iterator(homepages.end()), " ")
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<< endl;
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}
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/* And again for restricts. There's no global restrict key, since
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* it has no meaning outside of the repositories that support it.
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* Instead, we use PackageID::find_metadata to see if the key we
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* want exists, and then visitor_cast<> to see whether it's
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* of a suitable type (the key could be something other than a
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* MetadataSpecTreeKey<PlainTextSpecTree>). */
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if ((*i)->end_metadata() != (*i)->find_metadata("RESTRICT") &&
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visitor_cast<const MetadataSpecTreeKey<PlainTextSpecTree> >(**(*i)->find_metadata("RESTRICT")))
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{
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DepSpecFlattener<PlainTextSpecTree, PlainTextDepSpec> restricts(env.get(), *i);
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visitor_cast<const MetadataSpecTreeKey<PlainTextSpecTree> >(
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**(*i)->find_metadata("RESTRICT"))->parse_value()->top()->accept(restricts);
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cout << " " << left << setw(24) << "Restricts:" << " "
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<< join(indirect_iterator(restricts.begin()), indirect_iterator(restricts.end()), " ")
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<< endl;
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}
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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_SUCCESS;
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}
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