X-Git-Url: http://git.shiar.nl/barcat.git/blobdiff_plain/e8e86ee4ef87d10f2ec46c09f2c7ccd51adb0cb2..0efc8a341754dc7b8629008d0e7dbcba46d31af5:/barcat

diff --git a/barcat b/barcat
index 9c4741a..5863c4c 100755
--- a/barcat
+++ b/barcat
@@ -77,7 +77,10 @@ if (defined $opt{interval}) {
 	} or warn $@, "Expect slowdown with large datasets!\n";
 }
 
-$SIG{INT} = 'IGNORE';  # continue after assumed eof
+$SIG{INT} = sub {
+	$SIG{INT} = 'DEFAULT';  # reset for subsequent attempts
+	'IGNORE' # continue after assumed eof
+};
 
 my $valmatch = qr/$opt{anchor} ( \h* -? [0-9]* \.? [0-9]+ (?: e[+-]?[0-9]+ )? |)/x;
 while (readline) {
@@ -99,6 +102,12 @@ while (readline) {
 
 $SIG{INT} = 'DEFAULT';
 
+sub color {
+	$opt{color} and defined $_[0] or return '';
+	return "\e[$_[0]m" if defined wantarray;
+	$_ = color(@_) . $_ . color(0) if defined;
+}
+
 sub show_lines {
 
 state $nr = $opt{hidemin} ? $opt{hidemin} - 1 : 0;
@@ -124,18 +133,18 @@ if ($opt{markers} // 1 and $size > 0) {
 	$barmark[ orderpos($#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;
+	color(36) for @barmark;
 
 	state $lastmax = $maxval;
 	if ($maxval > $lastmax) {
 		print ' ' x ($lenval + $len);
-		printf "\e[90m" if $opt{color};
+		printf color(90);
 		printf '%-*s',
 			($lastmax - $minval) * $size + .5,
 			'-' x (($values[$nr - 1] - $minval) * $size);
-		print "\e[92m" if $opt{color};
+		print color(92);
 		say '+' x (($maxval - $lastmax - $minval) * $size + .5);
-		print "\e[0m" if $opt{color};
+		print color(0);
 		$lastmax = $maxval;
 	}
 }
@@ -143,13 +152,12 @@ if ($opt{markers} // 1 and $size > 0) {
 @lines > $nr or return if $opt{hidemin};
 
 sub sival {
-	my $unit = int(log($_[0]) / log(1000) - ($_[0] < 1));
-	my $float = $_[0] !~ /^ (?: 0*\.)? [0-9]{1,3} $/x;
-	sprintf('%*.*f%*s',
-		$float ? 5 : 3, $float,  # length and tenths
-		$_[0] / 1000 ** $unit,   # number
-		$float ? 0 : 3,          # unit size
-		$#{$opt{units}} >> 1 < abs $unit ? "e$unit" : $opt{units}->[$unit]
+	my $unit = int(log(abs $_[0] || 1) / log(10) - 3*($_[0] < 1) + 1e-15);
+	my $float = $_[0] !~ /^0*[-0-9]{1,3}$/;
+	sprintf('%3.*f%1s',
+		$float && ($unit % 3) == ($unit < 0),  # tenths
+		$_[0] / 1000 ** int($unit/3),   # number
+		$#{$opt{units}} * 1.5 < abs $unit ? "e$unit" : $opt{units}->[$unit/3]
 	);
 }
 
@@ -157,12 +165,12 @@ while ($nr <= $#lines) {
 	$nr >= $opt{hidemax} and last if defined $opt{hidemax};
 	my $val = $values[$nr];
 	if (length $val) {
-		my $color = !$opt{color} ? 0 :
+		my $color = !$opt{color} ? undef :
 			$val == $order[0] ? 32 : # max
 			$val == $order[-1] ? 31 : # min
 			90;
 		$val = $opt{units} ? sival($val) : sprintf "%*s", $lenval, $val;
-		$val = "\e[${color}m$val\e[0m" if $color;
+		color($color) for $val;
 	}
 	my $line = $lines[$nr] =~ s/\n/$val/r;
 	printf '%-*s', $len + length($val), $line;
@@ -192,6 +200,7 @@ if ($opt{stat}) {
 }
 
 __END__
+=encoding utf8
 
 =head1 NAME
 
@@ -315,15 +324,15 @@ Draw a sine wave:
 
     seq 30 | awk '{print sin($1/10)}' | barcat
 
-Compare file sizes:
+Compare file sizes (with human-readable numbers):
 
-    du -d0 -m * | barcat
+    du -d0 -b * | barcat -H
 
-Memory usage of user processes:
+Memory usage of user processes with long names truncated:
 
     ps xo %mem,pid,cmd | barcat -l40
 
-Monitor network latency:
+Monitor network latency from prefixed results:
 
     ping google.com | barcat -f'time=\K' -t
 
@@ -334,22 +343,30 @@ Commonly used after counting, for example users on the current server:
 Letter frequencies in text files:
 
     cat /usr/share/games/fortunes/*.u8 |
-    perl -CO -nE 'say for grep length, split /\PL*/, uc' |
+    perl -CS -nE 'say for grep length, split /\PL*/, uc' |
     sort | uniq -c | barcat
 
 Number of HTTP requests per day:
 
     cat log/access.log | cut -d\  -f4 | cut -d: -f1 | uniq -c | barcat
 
-Any kind of database query with leading counts:
+Any kind of database query with counts, preserving returned alignment:
 
     echo 'SELECT count(*),schemaname FROM pg_tables GROUP BY 2' |
     psql -t | barcat -u
 
+Earthquakes worldwide magnitude 1+ in the last 24 hours:
+
+    https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/1.0_day.csv |
+    column -tns, | graph -f4 -u -l80%
+
 External datasets, like movies per year:
 
     curl https://github.com/prust/wikipedia-movie-data/raw/master/movies.json |
-    jq '.[].year' | uniq -c | barcat
+    perl -054 -nlE 'say if s/^"year"://' | uniq -c | barcat
+
+But please get I<jq> to process JSON
+and replace the manual selection by C<< jq '.[].year' >>.
 
 Pokémon height comparison:
 
@@ -377,6 +394,12 @@ Or the top 3 most frequent authors with statistics over all:
 
     git shortlog -sn | barcat -L3 -s
 
+Activity of the last days (substitute date C<-v-{}d> on BSD):
+
+    ( git log --pretty=%ci --since=30day | cut -b-10
+      seq 0 30 | xargs -i date +%F -d-{}day ) |
+    sort | uniq -c | awk '$1--' | graph
+
 =head1 AUTHOR
 
 Mischa POSLAWSKY <perl@shiar.org>