parse values while reading lines

[barcat.git] / graph

diff --git a/graph b/graph
index b41f0c08855f1fbd73a17bedfb2ac1c5bfcfdedd..cb8a4061c10c5d5bcf68ca9f8154590eb667e0bc 100755 (executable)
--- a/graph
+++ b/graph
@@ -5,7 +5,7 @@ use utf8;
 use List::Util qw( min max sum );
 use open qw( :std :utf8 );
 
-our $VERSION = '1.00';
+our $VERSION = '1.01';
 
 use Getopt::Long '2.33', qw( :config gnu_getopt );
 sub podexit { require Pod::Usage; Pod::Usage::pod2usage(-exitval => 0, @_) }
@@ -20,16 +20,24 @@ GetOptions(\my %opt,
 $opt{width} ||= $ENV{COLUMNS} || 80;
 $opt{color} //= 1;
 
-my @lines = readline or exit;
-chomp for @lines;
-my @values = map { s/^\h* ( -? [0-9]* (?:\.[0-9]+)? )//x and $1 } @lines;
-my @order  = sort { $b <=> $a } grep { length } @values;
-if (defined $opt{trim}) {
-       my $trimpos = abs $opt{trim};
-       $trimpos <= 1 ? ($_ = substr($_, 0, 1)) :
-       (length > $trimpos and substr($_, $trimpos - 1) = '…') for @lines;
+my (@lines, @values);
+while (readline) {
+       chomp;
+       push @values, s/^\h* ( -? [0-9]* (?:\.[0-9]+)? )//x && $1;
+       if (defined $opt{trim}) {
+               my $trimpos = abs $opt{trim};
+               if ($trimpos <= 1) {
+                       $_ = substr $_, 0, 1;
+               }
+               elsif (length > $trimpos) {
+                       substr($_, $trimpos - 1) = '…';
+               }
+       }
+       push @lines, $_;
 }
+@lines or exit;
 
+my @order  = sort { $b <=> $a } grep { length } @values;
 my $maxval = $order[0];
 my $minval = min $order[-1], 0;
 my $lenval = max map { length } @order;
@@ -39,9 +47,11 @@ my $size   = ($maxval - $minval) &&
        ($opt{width} - $lenval - $len) / ($maxval - $minval);  # bar multiplication
 
 my @barmark;
-if ($opt{markers} // 1) {
+if ($opt{markers} // 1 and $size > 0) {
        sub orderpos { (($order[$_[0]] + $order[$_[0] + .5]) / 2 - $minval) * $size }
        $barmark[ (sum(@order) / @order - $minval) * $size ] = '=';  # average
+       $barmark[ orderpos($#order * .31731) ] = '>';
+       $barmark[ orderpos($#order * .68269) ] = '<';
        $barmark[ orderpos($#order / 2) ] = '+';  # mean
        $barmark[ -$minval * $size ] = '|' if $minval < 0;  # zero
        defined and $opt{color} and $_ = "\e[36m$_\e[0m" for @barmark;
@@ -59,7 +69,7 @@ for my $nr (0 .. $#lines) {
                print "\e[0m" if $color;
        }
        printf '%-*s', $len, $lines[$nr];
-       print $barmark[$_] // '-' for 1 .. (($val || 0) - $minval) * $size;
+       print $barmark[$_] // '-' for 1 .. $size && (($val || 0) - $minval) * $size;
        say '';
 }
 
@@ -112,9 +122,20 @@ the sum of all values divided by the number of counted lines.
 
 =item B<+>
 
-Median:
+Mean, median:
 the middle value or average between middle values.
 
+=item B<<>
+
+Standard deviation left of the mean.
+Only 16% of all values are lower.
+
+=item B<< > >>
+
+Standard deviation right of the mean.
+The part between B<< <--> >> encompass all I<normal> results,
+or 68% of all entries.
+
 =back
 
 =item -w, --width=<columns>