#!/usr/bin/perl
use strict;
use warnings;
use constant { MAX => 1, SIGIL => 0 };

$| = 1;
chomp( my $term_lines   = 0+`tput lines` );
chomp( my $term_columns = 0+`tput cols` );

@ARGV % 2 == 0 or die "$0: SIGIL SCALE ...\n";
my @trackers = map [ @ARGV[$_*2, 1+($_*2) ] ], 0 .. $#ARGV / 2;

my @lines;
while (<STDIN>) {
    my @F = /(\d+)/g or next;
    push @lines, \ @F;
    shift @lines if @lines >= $term_lines;

    # Drop my colored dots onto the field.
    my @cols = (' ') x $term_columns;
    for my $ix ( 0 .. $#trackers ) {
        my $tracker = $trackers[$ix];
        my $max   = \ $tracker->[MAX];
        my $sigil = $tracker->[SIGIL];
        my $datum = $F[$ix];

        if ( $$max < $datum ) {
          $$max = $datum;
        }
        my $scale = $$max;
        my $adjusted = $scale == 0 ? 0 : $datum / $scale;

        my $start_col = $#cols * $adjusted;
        for my $char ( 0 .. length($sigil)-1 ) {
          $cols[ $start_col + $char ] = "\e[" . (31 + $ix) . 'm' . sub
+str( $sigil, $char, 1 ) . "\e[0m";
        }
        # print "ix:$ix,col:$$col,max:$$max,sigil:$sigil,datum:$datum,
+scale:$scale,adjusted:$adjusted,col_idx:$col_idx\n";
    }

    splice @cols, $term_columns - 1 if @cols > $term_columns;
    print join( '', @cols ) . "\n";
}

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In reply to Lookee - Streaming graph for a console by diotalevi

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