134 lines
4.0 KiB
C++
134 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_contents.cc "example_contents.cc" .
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*
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* \ingroup g_contents
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*/
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/** \example example_contents.cc
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*
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* This example demonstrates how to use contents. It displays details about
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* the files installed by 'sys-apps/paludis'.
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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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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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namespace
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{
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/* This visitor displays information about ContentsEntry subclasses. */
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class ContentsPrinter
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{
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public:
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void visit(const ContentsFileEntry & d)
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{
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cout << left << setw(10) << "file" << d.location_key()->parse_value() << endl;
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}
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void visit(const ContentsDirEntry & d)
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{
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cout << left << setw(10) << "dir" << d.location_key()->parse_value() << endl;
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}
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void visit(const ContentsSymEntry & d)
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{
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cout << left << setw(10) << "sym" << d.location_key()->parse_value()
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<< " -> " << d.target_key()->parse_value() << endl;
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}
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void visit(const ContentsOtherEntry & d)
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{
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cout << left << setw(10) << "other" << d.location_key()->parse_value() << endl;
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}
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};
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}
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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_contents", "EXAMPLE_CONTENTS_OPTIONS", "EXAMPLE_CONTENTS_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 installed 'sys-apps/paludis'. */
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std::shared_ptr<const PackageIDSequence> ids((*env)[selection::AllVersionsSorted(
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generator::Package(QualifiedPackageName("sys-apps/paludis")) |
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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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/* Do we have contents key?*/
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auto contents((*i)->contents());
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if (! contents)
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{
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cout << "ID '" << **i << "' does not provide a contents key." << endl;
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}
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else
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{
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cout << "ID '" << **i << "' provides contents key:" << endl;
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/* Visit the contents key's value's entries with our visitor. We use
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* indirect_iterator because choices->begin() and ->end() return
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* iterators to std::shared_ptr<>s rather than raw objects. */
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ContentsPrinter p;
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std::for_each(
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indirect_iterator(contents->begin()),
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indirect_iterator(contents->end()),
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accept_visitor(p));
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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_status;
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}
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