X-Git-Url: http://git.shiar.nl/barcat.git/blobdiff_plain/11b7356d022a514eec11be18bdf63e4436a0321b..6b073cda9ed996cec5895eb2d9f0b0fd88e50312:/graph

diff --git a/graph b/graph
index 4bc6627..0d9db2e 100755
--- a/graph
+++ b/graph
@@ -1,32 +1,170 @@
 #!/usr/bin/env perl
 use 5.014;
 use warnings;
-use List::Util qw( max );
+use utf8;
+use List::Util qw( min max sum );
+use open qw( :std :utf8 );
 
-my $width = $ENV{COLUMNS} || 80;
+our $VERSION = '1.00';
 
-my @lines = readline;
+use Getopt::Long '2.33', qw( :config gnu_getopt );
+sub podexit { require Pod::Usage; Pod::Usage::pod2usage(-exitval => 0, @_) }
+GetOptions(\my %opt,
+	'color|c!',
+	'trim|length|l=i',
+	'markers|m=s',
+	'width|w=i',
+	'usage|h' => sub { podexit() },
+	'help'    => sub { podexit(-verbose => 2) },
+) or exit 64;  # EX_USAGE
+$opt{width} ||= $ENV{COLUMNS} || 80;
+$opt{color} //= 1;
+
+my @lines = readline or exit;
 chomp for @lines;
-my @values = map { s/^\h*([0-9]*)// and $1 } @lines;
-my @order  = sort { $b <=> $a } @values;
-my $lenval = 1 + int log($order[0]) / log 10;  # max string length
-my $len    = 1 + max map { length } @lines;  # left padding
-my $size   = ($width - $lenval - $len) / $order[0];  # bar multiplication
+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 $maxval = $order[0];
+my $minval = min $order[-1], 0;
+my $lenval = max map { length } @order;
+my $len    = defined $opt{trim} && $opt{trim} <= 0 ? -$opt{trim} + 1 :
+	1 + max map { length } @lines;  # left padding
+my $size   = ($maxval - $minval) &&
+	($opt{width} - $lenval - $len) / ($maxval - $minval);  # bar multiplication
 
-sub orderpos { ($order[$_[0]] + $order[$_[0] + .5]) / 2 * $size }
 my @barmark;
-$barmark[ orderpos($#order / 2) ] = '+';  # mean
+if ($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 / 2) ] = '+';  # mean
+	$barmark[ -$minval * $size ] = '|' if $minval < 0;  # zero
+	defined and $opt{color} and $_ = "\e[36m$_\e[0m" for @barmark;
+}
 
 for my $nr (0 .. $#lines) {
 	my $val = $values[$nr];
-	my $color =
-		$val == $order[0] ? 32 : # max
-		$val == $order[-1] ? 31 : # min
-		90;
-	printf "\e[%sm", $color if $color;
-	printf "%*s", $lenval, $val;
-	print "\e[0m" if $color;
+	if (length $val) {
+		my $color = !$opt{color} ? 0 :
+			$val == $order[0] ? 32 : # max
+			$val == $order[-1] ? 31 : # min
+			90;
+		printf "\e[%sm", $color if $color;
+		printf "%*s", $lenval, $val;
+		print "\e[0m" if $color;
+	}
 	printf '%-*s', $len, $lines[$nr];
-	print $barmark[$_] // '-' for 1 .. $val * $size;
+	print $barmark[$_] // '-' for 1 .. (($val || 0) - $minval) * $size;
 	say '';
 }
+
+__END__
+
+=head1 NAME
+
+graph - append bar chart to input numbers
+
+=head1 SYNOPSIS
+
+B<graph> [<options>] [<input>]
+
+=head1 DESCRIPTION
+
+Each line starting with a number is given a bar to visualise relative sizes.
+
+=head1 OPTIONS
+
+=over
+
+=item --no-color
+
+Disable colored output of values and bar markers.
+
+=item -l, --length=[-]<size>
+
+Trim line contents (between number and bars)
+to a maximum number of characters.
+The exceeding part is replaced by an abbreviation sign,
+unless C<--length=0>.
+
+Prepend a dash (i.e. make negative) to enforce padding
+regardless of encountered contents.
+
+=item -m, --markers=
+
+Statistical positions to indicate on bars.
+Cannot be customized yet,
+only disabled by providing an empty argument.
+
+Any value enables all marker characters:
+
+=over 2
+
+=item B<=>
+
+Average:
+the sum of all values divided by the number of counted lines.
+
+=item B<+>
+
+Median:
+the middle value or average between middle values.
+
+=back
+
+=item -w, --width=<columns>
+
+Override the maximum number of columns to use.
+Appended graphics will extend to fill up the entire screen.
+
+=back
+
+=head1 EXAMPLES
+
+Commonly used after counting, such as users on the current server:
+
+    users | sed 's/ /\n/g' | sort | uniq -c | graph
+
+Letter frequencies in text files:
+
+    cat /usr/share/games/fortunes/*.u8 |
+    perl -CO -nE 'say for grep length, split /\PL*/, uc' |
+    sort | uniq -c | graph
+
+Memory usage of user processes:
+
+    ps xo %mem,pid,cmd | graph -l40
+
+Sizes (in megabytes) of all root files and directories:
+
+    du -d0 -m * | graph
+
+Number of HTTP requests per day:
+
+    cat log/access.log | cut -d\  -f4 | cut -d: -f1 | uniq -c | graph
+
+Any kind of database query with leading counts:
+
+    echo 'SELECT count(*),schemaname FROM pg_tables GROUP BY 2' |
+    psql -t | graph
+
+Git statistics, such commit count by year:
+
+    git log --pretty=%ci | cut -b-4 | uniq -c | graph
+
+Or the most frequent authors:
+
+    git shortlog -sn | graph | head -3
+
+=head1 AUTHOR
+
+Mischa POSLAWSKY <perl@shiar.org>
+
+=head1 LICENSE
+
+GPL3+.