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.\" ========================================================================
.\"
.IX Title "Options 3pm"
.TH Options 3pm "2012-06-10" "perl v5.14.2" "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"
XMLTV::Options \- Command\-line parsing for XMLTV grabbers
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Utility library that implements command-line parsing and handles a lot
of functionality that is common to all \s-1XMLTV\s0 grabbers.
.SH "EXPORTED FUNCTIONS"
.IX Header "EXPORTED FUNCTIONS"
All these functions are exported on demand.
.SH "USAGE"
.IX Header "USAGE"
.IP "\fBParseOptions\fR" 4
.IX Item "ParseOptions"
ParseOptions shall be called by a grabber to parse the command-line
options supplied by the user. It takes a single hashref as a parameter.
The entries in the hash configure the behaviour of ParseOptions.
.Sp
.Vb 10
\&  my( $opt, $conf ) = ParseOptions( {
\&    grabber_name => \*(Aqtv_grab_test\*(Aq,
\&    version => \*(Aq$Id: Options.pm,v 1.24 2012/06/10 11:43:56 knowledgejunkie Exp $\*(Aq,
\&    description => \*(AqSweden (tv.swedb.se)\*(Aq,
\&    capabilities => [qw/baseline manualconfig apiconfig lineups/],
\&    stage_sub => \e&config_stage,
\&    listchannels_sub => \e&list_channels,
\&    list_lineups_sub => \e&list_lineups,
\&    get_lineup_sub => \e&get_lineup,
\&  } );
.Ve
.Sp
ParseOptions returns two hashrefs:
.RS 4
.IP "\(bu" 4
A hashref with the values for all command-line options in the
format returned by Getopt::Long (See \*(L"Storing options in a hash\*(R" in
Getopt::Long). This includes both options that the grabber
must handle as well as options that ParseOptions handles for the grabber.
.IP "\(bu" 4
A hashref to the data loaded from the configuration file.
See XMLTV::Configure for the format of \f(CW$conf\fR.
.RE
.RS 4
.Sp
ParseOptions handles the following options automatically without returning:
.IP "\-\-help" 4
.IX Item "--help"
.PD 0
.IP "\-\-capabilities" 4
.IX Item "--capabilities"
.IP "\-\-version" 4
.IX Item "--version"
.IP "\-\-description" 4
.IX Item "--description"
.IP "\-\-preferredmethod" 4
.IX Item "--preferredmethod"
.PD
Handled automatically if the preferredmethod capability has been set and
the preferredmethod option has been specified in the call to ParseOptions.
.RE
.RS 4
.Sp
ParseOptions also takes care of the following options without returning,
by calling the stage_sub, listchannels_sub, list_lineups_sub and get_lineup_sub
callbacks supplied by the grabber:
.IP "\-\-configure" 4
.IX Item "--configure"
.PD 0
.IP "\-\-configure\-api" 4
.IX Item "--configure-api"
.IP "\-\-stage" 4
.IX Item "--stage"
.IP "\-\-list\-channels" 4
.IX Item "--list-channels"
.IP "\-\-list\-lineups" 4
.IX Item "--list-lineups"
.IP "\-\-get\-lineup" 4
.IX Item "--get-lineup"
.RE
.RS 4
.PD
.Sp
ParseOptions will thus only return to the grabber when the grabber shall
actually grab data.
.Sp
If the \-\-output option is specified, \s-1STDOUT\s0 will be redirected to
the specified file.
.Sp
The grabber must check the following options on its own:
.IP "\-\-days" 4
.IX Item "--days"
.PD 0
.IP "\-\-offset" 4
.IX Item "--offset"
.IP "\-\-quiet" 4
.IX Item "--quiet"
.IP "\-\-debug" 4
.IX Item "--debug"
.RE
.RS 4
.PD
.Sp
and any other options that are grabber specific. This can be done by reading
\&\f(CW$opt\fR\->{days} etc.
.RE
.IP "\fBChanging the behaviour of ParseOptions\fR" 4
.IX Item "Changing the behaviour of ParseOptions"
The behaviour of ParseOptions can be influenced by passing named arguments
in the hashref. The following arguments are supported:
.RS 4
.IP "grabber_name" 4
.IX Item "grabber_name"
Required. The name of the grabber (e.g. tv_grab_se_swedb). This is used
when printing the synopsis.
.IP "description" 4
.IX Item "description"
Required. The description for the grabber. This is returned in response to
the \-\-description option and shall say which region the grabber returns data
for. Examples: \*(L"Sweden\*(R", or \*(L"Sweden (tv.swedb.se)\*(R" if there are several grabbers
for a region or country).
.IP "version" 4
.IX Item "version"
Required. This shall be a cvs Id field.
.IP "capabilities" 4
.IX Item "capabilities"
Required. The capabilities that the grabber shall support. Only capabilities
that XMLTV::Options knows how to handle can be specified. Example:
.Sp
.Vb 1
\&  capabilities => [qw/baseline manualconfig apiconfig/],
.Ve
.Sp
Note that XMLTV::Options guarantees that the grabber supports the manualconfig
and apiconfig capabilities. The capabilities share and cache can be
specified if the grabber supports them. XMLTV::Options will then automatically
accept the command-line parameters \-\-share and \-\-cache respectively.
.IP "stage_sub" 4
.IX Item "stage_sub"
Required. A coderef that takes a stage-name
and a configuration hashref as a parameter and returns an
xml-string that describes the configuration necessary for that stage.
The xml-string shall follow the xmltv\-configuration.dtd.
.IP "listchannels_sub" 4
.IX Item "listchannels_sub"
Required. A coderef that takes a configuration
hash as returned by XMLTV::Configure::LoadConfig as the first parameter
and an option hash as returned by
ParseOptions as the second parameter, and returns an xml-string
containing a list of all the channels that the grabber can deliver
data for using the supplied configuration. Note that the listsub
shall not use any channel-configuration from the hashref.
.IP "load_old_config_sub" 4
.IX Item "load_old_config_sub"
Optional. Default undef. A coderef that takes a filename as a parameter
and returns a configuration hash in the same format as returned by
XMLTV::Configure::LoadConfig. load_old_config_sub is called if
XMLTV::Configure::LoadConfig fails to parse the configuration file. This
allows the grabber to load configuration files created with an older
version of the grabber.
.IP "list_lineups_sub" 4
.IX Item "list_lineups_sub"
Optional. A coderef that takes a configuration
hash as returned by XMLTV::Configure::LoadConfig as the first parameter
and an option hash as returned by ParseOptions as the second parameter,
and returns an xml-string containing a list of all the channel lineups
that the grabber can deliver data for using the supplied configuration.
Note that the listsub shall not use any channel-configuration from the
hashref. The xml-string shall follow the xmltv\-lineups.xsd schema.
.IP "get_lineup_sub" 4
.IX Item "get_lineup_sub"
Optional. A coderef that returns an xml-string describing the configured
lineup. The xml-string shall follow the xmltv\-lineups.xsd schema.
.IP "preferredmethod" 4
.IX Item "preferredmethod"
Optional. A value to return when the grabber is called with the 
\&\-\-preferredmethod parameter. Example:
.Sp
.Vb 11
\&  my( $opt, $conf ) = ParseOptions( {
\&    grabber_name => \*(Aqtv_grab_test\*(Aq,
\&    version => \*(Aq$Id: Options.pm,v 1.24 2012/06/10 11:43:56 knowledgejunkie Exp $\*(Aq,
\&    description => \*(AqSweden (tv.swedb.se)\*(Aq,
\&    capabilities => [qw/baseline manualconfig apiconfig preferredmethod/],
\&    stage_sub => \e&config_stage,
\&    listchannels_sub => \e&list_channels,
\&    preferredmethod => \*(Aqallatonce\*(Aq,
\&    list_lineups_sub => \e&list_lineups,
\&    get_lineup_sub => \e&get_lineup,
\&  } );
.Ve
.IP "defaults" 4
.IX Item "defaults"
Optional. Default {}. A hashref that contains default values for the
command-line options. It shall be in the same format as returned by
Getopt::Long (See \*(L"Storing options in a hash\*(R" in  Getopt::Long).
.IP "extra_options" 4
.IX Item "extra_options"
Optional. Default []. An arrayref containing option definitions in the
format accepted by Getopt::Long. This can be used to support grabber-specific
options. The use of grabber-specific options is discouraged.
.RE
.RS 4
.RE
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (C) 2005,2006 Mattias Holmlund.
.PP
This program is free software; you can redistribute it and/or
modify it under the terms of the \s-1GNU\s0 General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
.PP
This program is distributed in the hope that it will be useful,
but \s-1WITHOUT\s0 \s-1ANY\s0 \s-1WARRANTY\s0; without even the implied warranty of
\&\s-1MERCHANTABILITY\s0 or \s-1FITNESS\s0 \s-1FOR\s0 A \s-1PARTICULAR\s0 \s-1PURPOSE\s0.  See the
\&\s-1GNU\s0 General Public License for more details.
.PP
You should have received a copy of the \s-1GNU\s0 General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, \s-1MA\s0  02110\-1301, \s-1USA\s0.