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.\" ========================================================================
.\"
.IX Title "OpenBSD::Search 3p"
.TH OpenBSD::Search 3p "2008-05-30" "perl v5.8.8" "Perl Programmers Reference Guide"
.SH "NAME"
OpenBSD::Search \- package names matching framework
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&   use OpenBSD::Search;
.Ve
.PP
.Vb 3
\&   # pkgspec objects
\&   my $search_object = OpenBSD::Search::PkgSpec->new($pattern);
\&   my $filter_object = OpenBSD::Search::Filter->keep_most_recent;
.Ve
.PP
.Vb 1
\&   # need repository to apply to
.Ve
.PP
.Vb 1
\&   use OpenBSD::PackageRepository::Installed;
.Ve
.PP
.Vb 1
\&   my $inst = OpenBSD::PackageRepository::Installed->new;
.Ve
.PP
.Vb 1
\&   my @list = $inst->match($search_object, $filter_object);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\f(CW\*(C`OpenBSD::Search\*(C'\fR provides a search infrastructure 
for \f(CW\*(C`OpenBSD::PackageRepository\*(C'\fR objects.
.PP
A given repository can be searched for existing packages using
\&\f(CW\*(C`$repo\->match($search1, $search2);\*(C'\fR
.PP
A repository list can be searched in a similar way: the search
proceeds through each repository in the list, and stops as soon
as it finds a non-empty match (similar to \f(CW\*(C`ld \-L\*(C'\fR rules).
.PP
The first search object \f(CW$search\fR is used to find the basic set
of matching packages, and further objects are used to weed out
unwanted elements from the list.
.PP
Complex searches must be built as lists of filter objects, in
order to preserve RepositoryList semantics, and ensure the correct
non-empty first match is returned.
.PP
The infrastructure provides the following objects:
.IP "OpenBSD::Search::PkgSpec" 4
.IX Item "OpenBSD::Search::PkgSpec"
\&\f(CW\*(C`OpenBSD::PkgSpec\*(C'\fR filters.
.IP "OpenBSD::Search::Stem" 4
.IX Item "OpenBSD::Search::Stem"
finds all packages with a given stem.
.IP "OpenBSD::Search::PartialStem" 4
.IX Item "OpenBSD::Search::PartialStem"
finds all packages including a partial stem.
.IP "OpenBSD::Search::Filter" 4
.IX Item "OpenBSD::Search::Filter"
filters package list through further tests.