X-Git-Url: http://git.shiar.net/barcat.git/blobdiff_plain/844032711314e4fbd780d9fb434fa4d4cc0d0708..dff4fd804b4c4f7002ae4aa01514a5f47898554b:/barcat

diff --git a/barcat b/barcat
index a571a25..8796248 100755
--- a/barcat
+++ b/barcat
@@ -4,8 +4,9 @@ use warnings;
 use utf8;
 use List::Util qw( min max sum );
 use open qw( :std :utf8 );
+use re '/msx';
 
-our $VERSION = '1.06';
+our $VERSION = '1.07';
 
 use Getopt::Long '2.33', qw( :config gnu_getopt );
 my %opt;
@@ -15,15 +16,15 @@ GetOptions(\%opt,
 	'field|f=s' => sub {
 		eval {
 			local $_ = $_[1];
-			$opt{anchor} = /^[0-9]+$/ ? qr/(?:\S*\h+){$_}\K/ : qr/$_/;
-		} or die $@ =~ s/(?: at .+)?$/ for option $_[0]/r;
+			$opt{anchor} = /\A[0-9]+\z/ ? qr/(?:\S*\h+){$_}\K/ : qr/$_/;
+		} or die $@ =~ s/(?:\ at\ \N+)?\Z/ for option $_[0]/r;
 	},
 	'human-readable|H!',
 	'interval|t:i',
 	'trim|length|l=s' => sub {
 		my ($optname, $optval) = @_;
 		$optval =~ s/%$// and $opt{trimpct}++;
-		$optval =~ m/^-?[0-9]+$/ or die(
+		$optval =~ m/\A-?[0-9]+\z/ or die(
 			"Value \"$optval\" invalid for option $optname",
 			" (number or percentage expected)\n"
 		);
@@ -38,7 +39,7 @@ GetOptions(\%opt,
 		my ($optname, $optval) = @_;
 		$optval ||= 0;
 		($opt{hidemin}, $opt{hidemax}) =
-		$optval =~ m/\A (?: ([0-9]+)? - )? ([0-9]+)? \z/x or die(
+		$optval =~ m/\A (?: ([0-9]+)? - )? ([0-9]+)? \z/ or die(
 			"Value \"$optval\" invalid for option limit",
 			" (range expected)\n"
 		);
@@ -77,12 +78,12 @@ GetOptions(\%opt,
 		exit;
 	},
 	'usage|h' => sub {
-		local $/;
+		local $/ = undef;  # slurp
 		my $pod = readline *DATA;
-		$pod =~ s/^=over\K/ 25/m;  # indent options list
-		$pod =~ s/^=item \N*\n\n\N*\n\K(?:(?:^=over.*?^=back\n)?(?!=)\N*\n)*/\n/msg;
+		$pod =~ s/^=over\K/ 25/;  # indent options list
+		$pod =~ s/^=item\ \N*\n\n\N*\n\K (?:(?:^=over.*?^=back\n)?(?!=)\N*\n)*/\n/g;
 		$pod =~ s/[.,](?=\n)//g;  # trailing punctuation
-		$pod =~ s/^=item \K(?=--)/____/gm;  # align long options
+		$pod =~ s/^=item\ \K(?=--)/____/g;  # align long options
 		# abbreviate <variable> indicators
 		$pod =~ s/\Q>.../s>/g;
 		$pod =~ s/<(?:number|count|seconds)>/N/g;
@@ -99,7 +100,7 @@ GetOptions(\%opt,
 		$parser->parse_string_document($pod);
 
 		$contents =~ s/\n(?=\n\h)//msg;  # strip space between items
-		$contents =~ s/^  \K____/    /gm;  # nbsp substitute
+		$contents =~ s/^\ \ \K____/    /g;  # nbsp substitute
 		print $contents;
 		exit;
 	},
@@ -123,7 +124,7 @@ $opt{'signal-stat'} //= exists $SIG{INFO} ? 'INFO' : 'QUIT';
 $opt{markers} //= '=avg >31.73v <68.27v +50v |0';
 $opt{palette} //= $opt{color} && [31, 90, 32];
 $opt{hidemin} = ($opt{hidemin} || 1) - 1;
-$opt{input} = @ARGV && $ARGV[0] =~ m/\A[-0-9]/ ? \@ARGV : undef
+$opt{input} = (@ARGV && $ARGV[0] =~ m/\A[-0-9]/) ? \@ARGV : undef
 	and undef $opt{interval};
 
 my (@lines, @values, @order);
@@ -146,20 +147,22 @@ if (defined $opt{interval}) {
 }
 
 my $valmatch = qr<
-	$opt{anchor} ( \h* -? [0-9]* \.? [0-9]+ (?: e[+-]?[0-9]+ )? |)
+	$opt{anchor} ( \h* -? [0-9]* [.]? [0-9]+ (?: e[+-]?[0-9]+ )? |)
 >x;
 while (defined ($_ = $opt{input} ? shift @{ $opt{input} } : readline)) {
 	s/\r?\n\z//;
-	s/^\h*// unless $opt{unmodified};
-	push @values, s/$valmatch/\n/ && $1;
-	push @order, $1 if length $1;
-	if (defined $opt{trim} and defined $1) {
+	s/\A\h*// unless $opt{unmodified};
+	my $valnum = s/$valmatch/\n/ && $1;
+	push @values, $valnum;
+	push @order, $valnum if length $valnum;
+	if (defined $opt{trim} and defined $valnum) {
 		my $trimpos = abs $opt{trim};
-		$trimpos -= length $1 if $opt{unmodified};
+		$trimpos -= length $valnum if $opt{unmodified};
 		if ($trimpos <= 1) {
 			$_ = substr $_, 0, 2;
 		}
 		elsif (length > $trimpos) {
+			# cut and replace (intentional lvalue for speed, contrary to PBP)
 			substr($_, $trimpos - 1) = '…';
 		}
 	}
@@ -182,8 +185,8 @@ sub color {
 
 sub sival {
 	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',
+	my $float = $_[0] !~ /\A0*[-0-9]{1,3}\z/;
+	return 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]
@@ -288,6 +291,7 @@ continue {
 }
 say $opt{palette} ? color(0) : '' if $opt{spark};
 
+	return $nr;
 }
 
 sub show_stat {
@@ -308,6 +312,7 @@ sub show_stat {
 		);
 	}
 	say '';
+	return 1;
 }
 
 sub show_exit {
@@ -536,6 +541,10 @@ Any kind of database query with counts, preserving returned alignment:
     echo 'SELECT count(*),schemaname FROM pg_tables GROUP BY 2' |
     psql -t | barcat -u
 
+In PostgreSQL from within the client:
+
+	postgres=> SELECT sin(generate_series(0, 3, .1)) \g |barcat
+
 Earthquakes worldwide magnitude 1+ in the last 24 hours:
 
     https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/1.0_day.csv |