ConversionSupport.pm

package Bio::EnsEMBL::Utils::ConversionSupport;

=head1 NAME

Bio::EnsEMBL::Utils::ConversionSupport - Utility module for Vega release and
schema conversion scripts

=head1 SYNOPSIS

    my $serverroot = '/path/to/ensembl';
    my $suport = new Bio::EnsEMBL::Utils::ConversionSupport($serverroot);

    # parse common options
    $support->parse_common_options;

    # parse extra options for your script
    $support->parse_extra_options('string_opt=s', 'numeric_opt=n');

    # ask user if he wants to run script with these parameters
    $support->confirm_params;

    # see individual method documentation for more stuff

=head1 DESCRIPTION

This module is a collection of common methods and provides helper functions 
for the Vega release and schema conversion scripts. Amongst others, it reads
options from a config file, parses commandline options and does logging.

=head1 LICENCE

This code is distributed under an Apache style licence:
Please see http://www.ensembl.org/code_licence.html for details

=head1 AUTHOR

Patrick Meidl <pm2@sanger.ac.uk>

=head1 CONTACT

Post questions to the EnsEMBL development list ensembl-dev@ebi.ac.uk

=cut

use strict;
use warnings;
no warnings 'uninitialized';

use Getopt::Long;
use Text::Wrap;
use Bio::EnsEMBL::Utils::Exception qw(throw warning);
use FindBin qw($Bin $Script);
use POSIX qw(strftime);
use Cwd qw(abs_path);
use DBI;
use Data::Dumper;

=head2 new

  Arg[1]      : String $serverroot - root directory of your ensembl sandbox
  Example     : my $support = new Bio::EnsEMBL::Utils::ConversionSupport(
                                        '/path/to/ensembl');
  Description : constructor
  Return type : Bio::EnsEMBL::Utils::ConversionSupport object
  Exceptions  : thrown if no serverroot is provided
  Caller      : general

=cut

sub new {
    my $class = shift;
    (my $serverroot = shift) or throw("You must supply a serverroot.");
    my $self = {
        '_serverroot'   => $serverroot,
        '_param'        => { interactive => 1 },
        '_warnings'     => 0,
    };
    bless ($self, $class);
    return $self;
}

=head2 parse_common_options

  Example     : $support->parse_common_options;
  Description : This method reads options from a configuration file and parses
                some commandline options that are common to all scripts (like
                db connection settings, help, dry-run). Commandline options
                will override config file settings. 

                All options will be accessible via $self->param('name').
  Return type : true on success 
  Exceptions  : thrown if configuration file can't be opened
  Caller      : general

=cut

sub parse_common_options {
    my $self = shift;

    # read commandline options
    my %h;
    Getopt::Long::Configure("pass_through");
    &GetOptions( \%h,
        'dbname|db_name=s',
        'host|dbhost|db_host=s',
        'port|dbport|db_port=n',
        'user|dbuser|db_user=s',
        'pass|dbpass|db_pass=s',
        'conffile|conf=s',
        'logfile|log=s',
        'logpath=s',
        'logappend|log_append=s',
        'verbose|v=s',
        'interactive|i=s',
        'dry_run|dry|n=s',
        'help|h|?',
    );


    # reads config file
    my $conffile = $h{'conffile'} || $self->serverroot . "/sanger-plugins/vega/conf/ini-files/Conversion.ini";
    $conffile = abs_path($conffile);
    if (-e $conffile) {
        open(CONF, $conffile) or throw( 
            "Unable to open configuration file $conffile for reading: $!");
        my $serverroot = $self->serverroot;
        while (<CONF>) {
            chomp;

            # remove comments
            s/^[#;].*//;
            s/\s+[;].*$//;

            # read options into internal parameter datastructure, removing whitespace
            next unless (/(\w\S*)\s*=\s*(\S*)\s*/);
            my $name = $1;
            my $val = $2;
            if ($val =~ /\$SERVERROOT/) {
                $val =~ s/\$SERVERROOT/$serverroot/g;
                $val = abs_path($val);
            }
            $self->param($name, $val);
        }
        $self->param('conffile', $conffile);
    } elsif ($conffile) {
        warning("Unable to open configuration file $conffile for reading: $!");
    }

    
    # override configured parameter with commandline options
    map { $self->param($_, $h{$_}) } keys %h;
    return(1);
}

=head2 parse_extra_options

  Arg[1-N]    : option descriptors that will be passed on to Getopt::Long
  Example     : $support->parse_extra_options('string_opt=s', 'numeric_opt=n');
  Description : Parse extra commandline options by passing them on to
                Getopt::Long and storing parameters in $self->param('name).
  Return type : true on success
  Exceptions  : none (caugth by $self->error)
  Caller      : general

=cut

sub parse_extra_options {
    my ($self, @params) = @_;
    Getopt::Long::Configure("no_pass_through");
    eval {
        # catch warnings to pass to $self->error
        local $SIG{__WARN__} = sub { die @_; };
        &GetOptions(\%{ $self->{'_param'} }, @params);
    };
    $self->error($@) if $@;
    return(1);
}

=head2 allowed_params

  Arg[1-N]    : (optional) List of allowed parameters to set
  Example     : my @allowed = $self->allowed_params(qw(param1 param2));
  Description : Getter/setter for allowed parameters. This is used by
                $self->confirm_params() to avoid cluttering of output with
                conffile entries not relevant for a given script. You can use
                $self->get_common_params() as a shortcut to set them.
  Return type : Array - list of allowed parameters
  Exceptions  : none
  Caller      : general

=cut

sub allowed_params {
    my $self = shift;

    # setter
    if (@_) {
        @{ $self->{'_allowed_params'} } = @_;
    }