+#
+# sam2fq
+#
+
+sub sam2fq {
+ my %opts = (n=>20, p=>'');
+ getopts('n:p:', \%opts);
+ die("Usage: samtools.pl sam2fq [-n 20] [-p <prefix>] <inp.sam>\n") if (@ARGV == 0 && -t STDIN);
+ if ($opts{p} && $opts{n} > 1) {
+ my $pre = $opts{p};
+ my @fh;
+ for (0 .. $opts{n}-1) {
+ open($fh[$_], sprintf("| gzip > $pre.%.3d.fq.gz", $_)) || die;
+ }
+ my $i = 0;
+ while (<>) {
+ next if (/^@/);
+ chomp;
+ my @t = split("\t");
+ next if ($t[9] eq '*');
+ my ($name, $seq, $qual);
+ if ($t[1] & 16) { # reverse strand
+ $seq = reverse($t[9]);
+ $qual = reverse($t[10]);
+ $seq =~ tr/ACGTacgt/TGCAtgca/;
+ } else {
+ ($seq, $qual) = @t[9,10];
+ }
+ $name = $t[0];
+ $name .= "/1" if ($t[1] & 0x40);
+ $name .= "/2" if ($t[1] & 0x80);
+ print {$fh[$i]} "\@$name\n$seq\n";
+ if ($qual ne '*') {
+ print {$fh[$i]} "+\n$qual\n";
+ }
+ $i = 0 if (++$i == $opts{n});
+ }
+ close($fh[$_]) for (0 .. $opts{n}-1);
+ } else {
+ die("To be implemented.\n");
+ }
+}
+
+#
+# sra2hdr
+#
+
+# This subroutine does not use an XML parser. It requires that the SRA
+# XML files are properly formated.
+sub sra2hdr {
+ my %opts = ();
+ getopts('', \%opts);
+ die("Usage: samtools.pl sra2hdr <SRA.prefix>\n") if (@ARGV == 0);
+ my $pre = $ARGV[0];
+ my $fh;
+ # read sample
+ my $sample = 'UNKNOWN';
+ open($fh, "$pre.sample.xml") || die;
+ while (<$fh>) {
+ $sample = $1 if (/<SAMPLE.*alias="([^"]+)"/i);
+ }
+ close($fh);
+ # read experiment
+ my (%exp2lib, $exp);
+ open($fh, "$pre.experiment.xml") || die;
+ while (<$fh>) {
+ if (/<EXPERIMENT.*accession="([^\s"]+)"/i) {
+ $exp = $1;
+ } elsif (/<LIBRARY_NAME>\s*(\S+)\s*<\/LIBRARY_NAME>/i) {
+ $exp2lib{$exp} = $1;
+ }
+ }
+ close($fh);
+ # read run
+ my ($run, @fn);
+ open($fh, "$pre.run.xml") || die;
+ while (<$fh>) {
+ if (/<RUN.*accession="([^\s"]+)"/i) {
+ $run = $1; @fn = ();
+ } elsif (/<EXPERIMENT_REF.*accession="([^\s"]+)"/i) {
+ print "\@RG\tID:$run\tSM:$sample\tLB:$exp2lib{$1}\n";
+ } elsif (/<FILE.*filename="([^\s"]+)"/i) {
+ push(@fn, $1);
+ } elsif (/<\/RUN>/i) {
+ if (@fn == 1) {
+ print STDERR "$fn[0]\t$run\n";
+ } else {
+ for (0 .. $#fn) {
+ print STDERR "$fn[$_]\t$run", "_", $_+1, "\n";
+ }
+ }
+ }
+ }
+ close($fh);
+}
+