plotpipe: 3 columns = x,y,color. Color must be numeric.

plotpipe/plotpipe

@@ -1,8 +1,5 @@
-#!/bin/bash
+#!/usr/bin/perl
 
-#!/bin/bash
-
-: <<=cut
 =pod
 
 =head1 NAME
@@ -63,4 +60,16 @@ B<gnuplot>
 
 =cut
 
-gnuplot -p -e 'plot "/dev/stdin"'
+$line1 = <>;
+@col = split /\s+/, $line1;
+if($#col == 1) {
+    # 2 col
+    open GNUPLOT,"|-", q(gnuplot -p -e 'plot "/dev/stdin"') or die;
+} elsif($#col == 2) {
+    # 3 col (3rd = color)
+    open GNUPLOT,"|-", q(gnuplot -p -e 'plot "/dev/stdin" using 1:2:3 with points palette') or die;
+} else {
+    die "$#col,@col,$line1";
+}
+print GNUPLOT $line1, <>;
+close GNUPLOT;

stdout/stdout

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 : <<=cut
 =encoding utf8

vid/vid

@@ -33,7 +33,7 @@ Play videos matching B<Documentary> but not B<BBC>:
 
 =head1 AUTHOR
 
-Copyright (C) 2018 Ole Tange,
+Copyright (C) 2018-2019 Ole Tange,
 http://ole.tange.dk and Free Software Foundation, Inc.