added the --tsv and --stacked options.

Use Pod::Usage to keep usage message in sync with pod.

tsplot

@@ -2,6 +2,7 @@
 use strict;
 use TimeSeries;
 use Getopt::Long;
+use Pod::Usage;
 
 =head1 NAME
 
@@ -15,6 +16,7 @@ tsplotv
 [--stacked]
 [--style style]
 [--time_t]
+[--tsv]
 [file ...]
 
 =head1 DESCRIPTION
@@ -22,7 +24,8 @@ tsplotv
 This program expects time series data in column format, I.e.,
 each line contains a timestamp and the values for each series, except
 the first one which contains the column headers, which are used for the
-legend. Columns are separated by any amount of whitespace.
+legend. Columns are separated by any amount of whitespace unless the
+--tsv option is given which enables tab-separated columns.
 
 The default legend position is "top right", same as with gnuplot.
 Another frequently useful position (especially if you have lots of series)
@@ -47,25 +50,32 @@ my $output_format ='png';
 my $log_y =0;
 my $time_t =0;
 my $style = "lines";
+my $tsv   = 0;
+my $stacked = 0;
 GetOptions('output_format|output-format=s' => \$output_format,
 	   'log_y|log-y'		   => \$log_y,
 	   'time_t'			   => \$time_t,
 	   'style:s'			   => \$style,
+	   'tsv'			   => \$tsv,
+	   'stacked'			   => \$stacked,
           ) 
-    or die "Usage: $0 [--output_format format] [files...]\n";
+    or pod2usage(verbose => 0);
 
+my $sep = $tsv ? qr/\t/ : ' ';
 
 binmode STDOUT, ':raw';
 
 my $ts = TimeSeries->new(output_format => $output_format);
 while (<>) {
-    my @legend = split;
+    chomp;
+    my @legend = split($sep);
     shift @legend;	# first must be for timestamp
     $ts->legend(@legend);
     last;
 }
 while (<>) {
-    my ($timestamp, @values) = split();
+    chomp;
+    my ($timestamp, @values) = split($sep);
     if ($time_t) {
 	$ts->add($timestamp, @values);
     } else {
@@ -74,6 +84,7 @@ while (<>) {
 }
 $ts->log_y($log_y);
 $ts->style($style);
+$ts->stacked($stacked);
 
 my $g = $ts->plot();
 print $g