--- /dev/null
+#!/usr/bin/env perl
+
+# Copyright (C) 2007-2009 Martin A. Hansen.
+
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+# http://www.gnu.org/copyleft/gpl.html
+
+
+# >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> DESCRIPTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
+
+# Extract subsequences from an indexed sequence file.
+
+# >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
+
+
+use warnings;
+use strict;
+use Data::Dumper;
+use Maasha::Biopieces;
+use Maasha::Filesys;
+use Maasha::Fasta;
+use Maasha::Seq;
+
+
+# >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
+
+
+my ( $options, $in, $out, $index, $fh, $record, $index_beg, $index_len, $beg, $end, $len, $seq );
+
+$options = Maasha::Biopieces::parse_options(
+ [
+ { long => 'index', short => 'i', type => 'string', mandatory => 'yes', default => undef, allowed => undef, disallowed => undef },
+ { long => 'seq_name', short => 's', type => 'string', mandatory => 'no', default => undef, allowed => undef, disallowed => undef },
+ { long => 'beg', short => 'b', type => 'uint', mandatory => 'no', default => undef, allowed => undef, disallowed => 0 },
+ { long => 'end', short => 'e', type => 'uint', mandatory => 'no', default => undef, allowed => undef, disallowed => 0 },
+ { long => 'len', short => 'l', type => 'uint', mandatory => 'no', default => undef, allowed => undef, disallowed => 0 },
+ ]
+);
+
+$in = Maasha::Biopieces::read_stream( $options->{ "stream_in" } );
+$out = Maasha::Biopieces::write_stream( $options->{ "stream_out" } );
+
+if ( $options->{ 'beg' } ) {
+ $options->{ 'beg' }--;
+} else {
+ $options->{ 'beg' } = 0;
+}
+
+$index = Maasha::Fasta::index_retrieve( $options->{ 'index' } . ".index" );
+
+if ( $index->{ 'FILE_SIZE' } != Maasha::Filesys::file_size( $options->{ 'index' } . ".seq" ) ) {
+ Maasha::Common::error( qq(Filesize mismatch: $options->{ 'index' }.seq != $index->{ 'FILE_SIZE' }) );
+}
+
+$fh = Maasha::Filesys::file_read_open( $options->{ 'index' } . ".seq" );
+
+
+if ( $options->{ 'seq_name' } and exists $index->{ $options->{ 'seq_name' } } )
+{
+ ( $index_beg, $index_len ) = @{ $index->{ $options->{ 'seq_name' } } };
+
+ $beg = $options->{ 'beg' };
+ $end = $options->{ 'end' };
+ $len = $options->{ 'len' };
+
+ $seq = seq_get( $fh, $index_beg, $index_len, $beg, $end, $len );
+
+ if ( $seq )
+ {
+ $record->{ 'SEQ_NAME' } = $options->{ 'seq_name' };
+ $record->{ 'SEQ' } = $seq;
+ $record->{ 'SEQ_LEN' } = length $record->{ 'SEQ' };
+
+ Maasha::Biopieces::put_record( $record, $out );
+ }
+}
+
+
+while ( $record = Maasha::Biopieces::get_record( $in ) )
+{
+ if ( exists $index->{ $record->{ 'SEQ_NAME' } } )
+ {
+ ( $index_beg, $index_len ) = @{ $index->{ $record->{ 'SEQ_NAME' } } };
+
+ $beg = $record->{ 'BEG' } || $options->{ 'beg' };
+ $end = $record->{ 'END' } || $options->{ 'end' };
+ $len = $record->{ 'LEN' } || $options->{ 'len' };
+
+ $seq = seq_get( $fh, $index_beg, $index_len, $beg, $end, $len );
+
+ if ( $seq )
+ {
+ $record->{ 'SEQ' } = $seq;
+ $record->{ 'SEQ_LEN' } = length $record->{ 'SEQ' };
+ }
+ }
+
+ Maasha::Biopieces::put_record( $record, $out );
+}
+
+close $fh;
+
+Maasha::Biopieces::close_stream( $in );
+Maasha::Biopieces::close_stream( $out );
+
+
+# >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
+
+
+sub seq_get
+{
+ # Martin A. Hansen, September 2009.
+
+ # Adjust the index coordianates according to specified options,
+ # and retrieves the sequence thus specified. The sequence is
+ # returned.
+
+ my ( $fh, # filehandle to sequence file
+ $index_beg, # begin position of sequence entry
+ $index_len, # length of sequence entry
+ $opt_beg, # optional begin position - OPTIONAL
+ $opt_end, # optional end position - OPTIONAL
+ $opt_len, # optional length - OPTIONAL
+ ) = @_;
+
+ # Returns a string.
+
+ my ( $beg, $len, $seq );
+
+ $beg = $index_beg;
+
+ if ( $opt_beg ) {
+ $beg += $opt_beg;
+ }
+
+ if ( $opt_len )
+ {
+ $len = $opt_len;
+ }
+ elsif ( $opt_end )
+ {
+ $len = $opt_end - $opt_beg;
+ }
+ else
+ {
+ $len = $index_len - $opt_beg;
+ }
+
+ if ( $len > $index_len - $opt_beg ) {
+ $len = $index_len - $opt_beg;
+ }
+
+ return if $beg > $index_beg + $index_len - 1 or $len <= 0;
+
+ $seq = Maasha::Filesys::file_read( $fh, $beg, $len );
+
+ return $seq;
+}
+
+
+# >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
+
+
+BEGIN
+{
+ Maasha::Biopieces::status_set();
+}
+
+
+END
+{
+ Maasha::Biopieces::status_log();
+}
+
+
+# >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
+
+
+__END__