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.IX Title "Lintian::Lab::ManifestDiff 3"
.TH Lintian::Lab::ManifestDiff 3 "2019-04-04" "Lintian v2.12.0~bpo9+1" "Debian Package Checker"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
Lintian::Lab::ManifestDiff \-\- Difference representation between two Manifests
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& use Lintian::Lab::Manifest;
\& 
\& my $olist = Lintian::Lab::Manifest\->new (\*(Aqbinary\*(Aq);
\& my $nlist = Lintian::Lab::Manifest\->new (\*(Aqbinary\*(Aq);
\& $olist\->read_list (\*(Aqold/binary\-packages\*(Aq);
\& $nlist\->read_list (\*(Aqnew/binary\-packages\*(Aq);
\& my $diff = $olist\->diff($nlist);
\& foreach my $added (@{ $diff\->added }) {
\&    my $entry = $nlist\->get (@$added);
\&    # do something
\& }
\& foreach my $removed (@{ $diff\->removed }) {
\&    my $entry = $olist\->get (@$removed);
\&    # do something
\& }
\& foreach my $changed (@{ $diff\->changed }) {
\&    my $oentry = $olist\->get (@$changed);
\&    my $nentry = $nlist\->get (@$changed);
\&    # use/diff $oentry and $nentry as needed
\& }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Instances of this class provides access to the packages list used by
the Lab as caches.
.SH "METHODS"
.IX Header "METHODS"
.ie n .IP "$diff\->added" 4
.el .IP "\f(CW$diff\fR\->added" 4
.IX Item "$diff->added"
Returns a listref containing the keys of the elements that has been added.
.Sp
Each element is a listref of keys; this list (when dereferenced) can be
used with the manifest's get method to look up the item.
.ie n .IP "$diff\->removed" 4
.el .IP "\f(CW$diff\fR\->removed" 4
.IX Item "$diff->removed"
Returns a listref containing the keys of the elements that has been removed.
.Sp
Each element is a listref of keys; this list (when dereferenced) can
be used with the manifest's get method to look up the item.
.ie n .IP "$diff\->changed" 4
.el .IP "\f(CW$diff\fR\->changed" 4
.IX Item "$diff->changed"
Returns a listref containing the keys of the elements that has been changed.
.Sp
Each element is a listref of keys; this list (when dereferenced) can
be used with the manifest's get method to look up the item.
.ie n .IP "$diff\->nlist" 4
.el .IP "\f(CW$diff\fR\->nlist" 4
.IX Item "$diff->nlist"
Returns the \*(L"new\*(R" manifest used to create this diff.  Note the manifest is not
copied and may have been changed since the diff has been created.
.ie n .IP "$diff\->olist" 4
.el .IP "\f(CW$diff\fR\->olist" 4
.IX Item "$diff->olist"
Returns the \*(L"orig\*(R" manifest used to create this diff.  Note the manifest is not
copied and may have been changed since the diff has been created.
.PP
Originally written by Niels Thykier <niels@thykier.net> for Lintian.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIlintian\fR\|(1)