5 use List::Util qw( min max sum );
6 use open qw( :std :utf8 );
10 use Getopt::Long '2.33', qw( :config gnu_getopt );
11 sub podexit { require Pod::Usage; Pod::Usage::pod2usage(-exitval => 0, @_) }
17 'usage|h' => sub { podexit() },
18 'help' => sub { podexit(-verbose => 2) },
19 ) or exit 64; # EX_USAGE
20 $opt{width} ||= $ENV{COLUMNS} || 80;
23 my @lines = readline or exit;
25 my @values = map { s/^\h* ( -? [0-9]* (?:\.[0-9]+)? )//x and $1 } @lines;
26 my @order = sort { $b <=> $a } grep { length } @values;
28 my $trimpos = abs $opt{trim};
29 $trimpos == 1 ? ($_ = substr($_, 0, 1)) :
30 (length > $trimpos and substr($_, $trimpos - 1) = '…') for @lines;
33 my $maxval = $order[0];
34 my $minval = min $order[-1], 0;
35 my $lenval = max map { length } @order;
36 my $len = defined $opt{trim} && $opt{trim} < 0 ? -$opt{trim} + 1 :
37 1 + max map { length } @lines; # left padding
38 my $size = ($maxval - $minval) &&
39 ($opt{width} - $lenval - $len) / ($maxval - $minval); # bar multiplication
42 if ($opt{markers} // 1) {
43 sub orderpos { (($order[$_[0]] + $order[$_[0] + .5]) / 2 - $minval) * $size }
44 $barmark[ (sum(@order) / @order - $minval) * $size ] = '='; # average
45 $barmark[ orderpos($#order / 2) ] = '+'; # mean
46 $barmark[ -$minval * $size ] = '|' if $minval < 0; # zero
47 defined and $opt{color} and $_ = "\e[36m$_\e[0m" for @barmark;
50 for my $nr (0 .. $#lines) {
51 my $val = $values[$nr];
53 my $color = !$opt{color} ? 0 :
54 $val == $order[0] ? 32 : # max
55 $val == $order[-1] ? 31 : # min
57 printf "\e[%sm", $color if $color;
58 printf "%*s", $lenval, $val;
59 print "\e[0m" if $color;
61 printf '%-*s', $len, $lines[$nr];
62 print $barmark[$_] // '-' for 1 .. (($val || 0) - $minval) * $size;
70 graph - append bar chart to input numbers
74 B<graph> [<options>] [<input>]
78 Each line starting with a number is given a bar to visualise relative sizes.
86 Disable colored output of values and bar markers.
88 =item -l, --length=[-]<size>
90 Trim line contents (between number and bars)
91 to a maximum number of characters.
92 The exceeding part is replaced by an abbreviation sign.
94 Prepend a dash (i.e. make negative) to enforce padding
95 regardless of encountered contents.
99 Statistical positions to indicate on bars.
100 Cannot be customized yet,
101 only disabled by providing an empty argument.
103 Any value enables all marker characters:
110 the sum of all values divided by the number of counted lines.
115 the middle value or average between middle values.
119 =item -w, --width=<columns>
121 Override the maximum number of columns to use.
122 Appended graphics will extend to fill up the entire screen.
128 Commonly used after counting, such as users on the current server:
130 users | sed 's/ /\n/g' | sort | uniq -c | graph
132 Letter frequencies in text files:
134 cat /usr/share/games/fortunes/*.u8 |
135 perl -CO -nE 'say for grep length, split /\PL*/, uc' |
136 sort | uniq -c | graph
138 Memory usage of user processes:
140 ps xo %mem,pid,cmd | graph -l40
142 Sizes (in megabytes) of all root files and directories:
146 Number of HTTP requests per day:
148 cat log/access.log | cut -d\ -f4 | cut -d: -f1 | uniq -c | graph
150 Any kind of database query with leading counts:
152 echo 'SELECT count(*),schemaname FROM pg_tables GROUP BY 2' |
155 Git statistics, such commit count by year:
157 git log --pretty=%ci | cut -b-4 | uniq -c | graph
159 Or the most frequent authors:
161 git shortlog -sn | graph | head -3
165 Mischa POSLAWSKY <perl@shiar.org>