X-Git-Url: http://git.shiar.nl/barcat.git/blobdiff_plain/c53a0e13374a11b34c052685fb6711dd1bd7d8f1..9eb6da139e4958a8f31c03e62073f1a0f6e20898:/barcat

diff --git a/barcat b/barcat
index 0cfdb2d..0f0cfb8 100755
--- a/barcat
+++ b/barcat
@@ -26,6 +26,7 @@ GetOptions(\%opt,
 			$opt{anchor} = qr/$_/;
 		} or die $@ =~ s/(?:\ at\ \N+)?\Z/ for option $_[0]/r;
 	},
+	'count|c!',
 	'human-readable|H!',
 	'sexagesimal!',
 	'reformat!',
@@ -189,7 +190,7 @@ $opt{'value-format'} = $opt{sexagesimal} ? sub {
 $opt{'value-format'} ||= sub { sprintf '%.8g', $_[0] };
 
 
-my (@lines, @values, @order);
+my (@lines, @values, @order, %uniq);
 
 $SIG{$_} = \&show_stat for $opt{'signal-stat'} || ();
 $SIG{ALRM} = sub {
@@ -205,17 +206,29 @@ if (defined $opt{interval}) {
 	eval {
 		require Tie::Array::Sorted;
 		tie @order, 'Tie::Array::Sorted', sub { $_[1] <=> $_[0] };
-	} or warn $@, "Expect slowdown with large datasets!\n";
+	} or warn $@, "Expect slowdown with large datasets!\n"
+		unless $opt{count};
 }
 
 my $float = qr<[0-9]* [.]? [0-9]+ (?: e[+-]?[0-9]+ )?>; # positive numberish
-my $valmatch = qr< $opt{anchor} ( \h* -? $float |) >x;
+my $valmatch = qr< $opt{anchor} ( \h* -? $float |) >;
 while (defined ($_ = $opt{input} ? shift @{ $opt{input} } : readline)) {
 	s/\r?\n\z//;
-	s/\A\h*// unless $opt{unmodified};
-	my $valnum = s/$valmatch/\n/ && $1;
-	push @values, $valnum;
-	push @order, $valnum if length $valnum;
+	my $valnum;
+	if ($opt{count}) {
+		($valnum) = m/$opt{anchor} (\S*)/;
+		$valnum //= '';
+		$uniq{$valnum}++ and next;
+		push @values, $valnum;
+		s/\A/\n /;
+	}
+	else {
+		s/\A\h*// unless $opt{unmodified};
+		$valnum = s/$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 $valnum if $opt{unmodified};
@@ -228,6 +241,8 @@ while (defined ($_ = $opt{input} ? shift @{ $opt{input} } : readline)) {
 		}
 	}
 	push @lines, $_;
+}
+continue {
 	show_lines() if defined $opt{interval} and $opt{interval} < 0
 		and $. % $opt{interval} == 0;
 }
@@ -247,6 +262,11 @@ state $nr = $opt{hidemin} ? $opt{hidemin}->($#lines) : 0;
 
 my $limit = $opt{hidemax} ? $opt{hidemax}->($#lines, $nr) : $#lines;
 
+if ($opt{count}) {
+	$_ = $uniq{$_} for @values[$nr .. $limit];
+	@order = @values;
+}
+
 @order = sort { $b <=> $a } @order unless tied @order;
 my $maxval = $opt{maxval} // (
 	$opt{hidemax} ? max grep { length } @values[$nr .. $limit] :
@@ -374,6 +394,7 @@ continue {
 	$nr++;
 }
 say $opt{palette} ? color(0) : '' if $opt{spark};
+%uniq = () if $opt{interval} and $opt{count};
 
 	return $nr;
 }
@@ -438,6 +459,8 @@ Usage:                                               /\_/\
 Options:
   -a, --[no-]ascii         Restrict user interface to ASCII characters
   -C, --[no-]color         Force colored output of values and bar markers
+  -c, --count              Omit repetitions and count the number of
+                           occurrences
   -f, --field=([+]N|REGEXP)
                            Compare values after a given number of whitespace
                            separators
@@ -509,6 +532,12 @@ disabled otherwise such as when piped or redirected.
 Can also be disabled by setting B<-M>
 or the I<NO_COLOR> environment variable.
 
+=item B<-c>, B<--count>
+
+Omit repetitions and count the number of occurrences.
+Similar to piping input to C<sort | uniq -c>
+but keeping the order of first appearances.
+
 =item B<-f>, B<--field>=([B<+>]I<number> | I<regexp>)
 
 Compare values after a given number of whitespace separators,
@@ -742,19 +771,19 @@ Monitor network latency from prefixed results:
 
     ping google.com | barcat -f'time=\K' -t
 
-Commonly used after counting, for example users on the current server:
-
-    users | tr ' ' '\n' | sort | uniq -c | barcat
-
-Letter frequencies in text files:
+Commonly used after counting, eg letter frequencies in text files:
 
     cat /usr/share/games/fortunes/*.u8 |
     perl -CS -nE 'say for grep length, split /\PL*/, uc' |
     sort | uniq -c | barcat
 
+Users on the current server while preserving order:
+
+    users | tr ' ' '\n' | barcat -c
+
 Number of HTTP requests per day:
 
-    cat httpd/access.log | cut -d\  -f4 | cut -d: -f1 | uniq -c | barcat
+    barcat -cf'\[([^:]+)' httpd/access.log
 
 Any kind of database query results, preserving returned alignment: