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.\" ========================================================================
.\"
.IX Title "Config::Model::Backend::DpkgSyntax 3pm"
.TH Config::Model::Backend::DpkgSyntax 3pm "2014-10-31" "perl v5.20.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Config::Model::Backend::DpkgSyntax \- Role to read and write files with Dpkg syntax
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\& package MyParser ;
\& use Log::Log4perl qw(:easy);
\& Log::Log4perl\->easy_init($WARN);
\& 
\& use Mouse ;
\& with \*(AqConfig::Model::Backend::DpkgSyntax\*(Aq;
\& 
\& package main ;
\& use IO::File ;
\& use Data::Dumper ;
\& 
\& my $data = [ [ qw/Name Foo Version 1.2/ ],
\&              [ qw/Name Bar Version 1.3/ ,
\&                Files => [qw/file1 file2/] ,
\&                Description => "A very\en\enlong description"
\&             ]
\&           ] ;
\& 
\& my $fhw = IO::File\->new ;
\& $fhw \-> open ( \*(Aqdpkg_file\*(Aq ,\*(Aq>\*(Aq ) ;
\& my $parser = MyParser\->new() ;
\& 
\& $parser\->write_dpkg_file($fhw,$data) ;
.Ve
.PP
\&\f(CW\*(C`dpkg_file\*(C'\fR will contain:
.PP
.Vb 2
\& Name: Foo
\& Version: 1.2
\&
\& Name: Bar
\& Version: 1.3
\& Files: file1,
\&        file2
\& Description: A very
\&  .
\&  long description
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module is a Moose role to read and write dpkg control files.
.PP
Debian control file are read and transformed in a list of list
matching the control file. The top level list of a list of section.
Each section is mapped to a list made of keywords and values. Since
this explanation is probably too abstract, here's an example of a file
written with Dpkg syntax:
.PP
.Vb 2
\& Name: Foo
\& Version: 1.1
\&
\& Name: Bar
\& # boy, new version
\& Version: 1.2
\&  Description: A very
\&  . 
\&  long description
.Ve
.PP
Once parsed, this file will be stored in the following list of list :
.PP
.Vb 6
\& (
\&   [ Name => \*(AqFoo\*(Aq, Version => \*(Aq1.1\*(Aq ],
\&   [ Name => \*(AqBar\*(Aq, Version => [ \*(Aq1.2\*(Aq \*(Aqboy, new version\*(Aq ], 
\&     Description => "A very\en\enlong description"
\&   ]
\& )
.Ve
.PP
Note: The description is changed into a paragraph without the Dpkg
syntax idiosyncrasies. The leading white space is removed and the single
dot is transformed in to a \*(L"\en\*(R". These characters will be restored
when the file is written back.
.PP
Last not but not least, this module can be re-used outside of \f(CW\*(C`Config::Model\*(C'\fR with some 
small modifications in exception handing. Ask the author
if you want this module shipped in its own distribution.
.SH ""
.IX Header ""
.SS "parse_dpkg_file ( file_handle, check, comment_allowed )"
.IX Subsection "parse_dpkg_file ( file_handle, check, comment_allowed )"
Read a control file from the file_handle and returns a nested list (or a list 
ref) containing data from the file.
.PP
The returned list is of the form :
.PP
.Vb 9
\& [
\&   # section 1
\&   [ keyword1 => value1, # for text or simple values
\&     keyword2 => value2, # etc 
\&   ],
\&   # section 2
\&   [ ... ]
\&   # etc ...
\& ]
.Ve
.PP
check is \f(CW\*(C`yes\*(C'\fR, \f(CW\*(C`skip\*(C'\fR or \f(CW\*(C`no\*(C'\fR.  \f(CW\*(C`comment_allowed\*(C'\fR is boolean (default 0)
.PP
When comments are provided in the dpkg files, the returned list is of
the form :
.PP
.Vb 7
\& [
\&   [ 
\&     keyword1 => [ value1, \*(Aqvalue1 comment\*(Aq] 
\&     keyword2 => value2, # no comment 
\&   ],
\&   [ ... ]
\& ]
.Ve
.SS "parse_dpkg_lines (lines, check, comment_allowed )"
.IX Subsection "parse_dpkg_lines (lines, check, comment_allowed )"
Parse the dpkg date from lines (which is an array ref) and return a data 
structure like parse_dpkg_file.
.SS "write_dpkg_file ( io_handle, list_ref, list_sep )"
.IX Subsection "write_dpkg_file ( io_handle, list_ref, list_sep )"
Munge the passed list ref into a string compatible with control files
and write it in the passed file handle.
.PP
The input is a list of list in a form similar to the one generated by
parse_dpkg_file:
.PP
.Vb 1
\& [ section [ keyword => value | value_list ] ]
.Ve
.PP
Except that the value may be a \s-1SCALAR\s0 or a list ref. In case, of a list ref, the list 
items will be joined with the value \f(CW\*(C`list_sep\*(C'\fR before being written. Values will be aligned
in case of multi-line output of a list.
.PP
For instance the following code :
.PP
.Vb 2
\& my $ref = [ [ Foo => \*(Aqfoo value\*(Aq , Bar => [ qw/v1 v2/ ] ];
\& write_dpkg_file ( $ioh, $ref, \*(Aq, \*(Aq )
.Ve
.PP
will yield:
.PP
.Vb 2
\& Foo: foo value
\& Bar: v1, v2
.Ve
.SH "AUTHOR"
.IX Header "AUTHOR"
Dominique Dumont, (ddumont at cpan dot org)
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Config::Model, 
Config::Model::AutoRead, 
Config::Model::Backend::Any,