-#!/usr/bin/env perl
-use 5.018;
+#!/usr/bin/perl -CA
+use 5.014;
use warnings;
use utf8;
use List::Util qw( min max sum );
use open qw( :std :utf8 );
-use experimental qw( lexical_subs );
+use re '/msx';
-our $VERSION = '1.04';
+our $VERSION = '1.08';
-use Getopt::Long '2.33', qw( :config gnu_getopt );
-sub podexit {
- require Pod::Usage;
- Pod::Usage::pod2usage(-exitval => 0, -perldocopt => '-oman', @_);
-}
my %opt;
+if (@ARGV) {
+require Getopt::Long;
+Getopt::Long->import('2.33', qw( :config gnu_getopt ));
GetOptions(\%opt,
+ 'ascii|a!',
'color|c!',
'C' => sub { $opt{color} = 0 },
'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 $optname",
" (number or percentage expected)\n"
);
'value-length=i',
'hidemin=i',
'hidemax=i',
- 'limit|L=s' => sub {
+ 'minval=f',
+ 'maxval=f',
+ 'limit|L:s' => sub {
my ($optname, $optval) = @_;
$optval ||= 0;
+ $optval =~ /\A-[0-9]+\z/ and $optval .= '-'; # tail shorthand
($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"
);
},
+ 'header!',
'markers|m=s',
+ 'graph-format=s' => sub {
+ $opt{'graph-format'} = substr $_[1], 0, 1;
+ },
+ 'spark|_!',
+ 'indicators:s',
+ 'palette=s' => sub {
+ $opt{palette} = {
+ '' => [],
+ fire => [qw( 90 31 91 33 93 97 96 )],
+ fire256=> [map {"38;5;$_"} qw(
+ 235 52 88 124 160 196
+ 202 208 214 220 226 227 228 229 230 231 159
+ )],
+ whites => [qw( 1;30 0;37 1;37 )],
+ greys => [map {"38;5;$_"} 0, 232..255, 15],
+ random => [map {"38;5;$_"} List::Util::shuffle(17..231)],
+ rainbow=> [map {"38;5;$_"}
+ 196, # r
+ (map { 196 + $_*6 } 0..4), # +g
+ (map { 226 - $_*6*6 } 0..4), # -r
+ (map { 46 + $_ } 0..4), # +b
+ (map { 51 - $_*6 } 0..4), # -g
+ (map { 21 + $_*6*6 } 0..4), # +r
+ (map { 201 - $_ } 0..4), # -b
+ 196,
+ ],
+ }->{$_[1]} // do {
+ my @vals = split /[^0-9;]/, $_[1]
+ or die "Empty palette resulting from \"$_[1]\"\n";
+ \@vals;
+ };
+ },
'stat|s!',
+ 'signal-stat=s',
'unmodified|u!',
'width|w=i',
- 'usage|h' => sub { podexit() },
- 'help' => sub { podexit(-verbose => 2) },
+ 'version|V' => sub {
+ my $mascot = $opt{ascii} ? '=^,^=' : 'ฅ^•ﻌ•^ฅ';
+ say "barcat $mascot version $VERSION";
+ exit;
+ },
+ 'usage|h' => sub {
+ /^=/ ? last : print for readline *DATA; # text between __END__ and pod
+ exit;
+ },
+ 'help|?' => sub {
+ require Pod::Usage;
+ Pod::Usage::pod2usage(
+ -exitval => 0, -perldocopt => '-oman', -verbose => 2,
+ );
+ },
) or exit 64; # EX_USAGE
+}
-$opt{width} ||= $ENV{COLUMNS} || 80;
+$opt{width} ||= $ENV{COLUMNS} || qx(tput cols) || 80 unless $opt{spark};
$opt{color} //= -t *STDOUT; # enable on tty
+$opt{'graph-format'} //= '-';
$opt{trim} *= $opt{width} / 100 if $opt{trimpct};
-$opt{units} = [split //, ' kMGTPEZYyzafpnμm'] if $opt{'human-readable'};
+$opt{units} = [split //, ' kMGTPEZYyzafpn'.($opt{ascii} ? 'u' : 'μ').'m']
+ if $opt{'human-readable'};
$opt{anchor} //= qr/\A/;
$opt{'value-length'} = 6 if $opt{units};
+$opt{'value-length'} = 1 if $opt{unmodified};
+$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{indicators} = [split //, $opt{indicators} ||
+ ($opt{ascii} ? ' .oO' : $opt{spark} ? ' ▁▂▃▄▅▆▇█' : ' ▏▎▍▌▋▊▉█')
+] if defined $opt{indicators} or $opt{spark};
+$opt{hidemin} = ($opt{hidemin} || 1) - 1;
+$opt{input} = (@ARGV && $ARGV[0] =~ m/\A[-0-9]/) ? \@ARGV : undef
+ and undef $opt{interval};
+
+$opt{'sum-format'} = sub { sprintf '%.8g', $_[0] };
+$opt{'calc-format'} = sub { sprintf '%*.*f', 0, 2, $_[0] };
+$opt{'value-format'} = $opt{units} && sub {
+ my $unit = (
+ log(abs $_[0] || 1) / log(10)
+ - 3 * (abs($_[0]) < .9995) # shift to smaller unit if below 1
+ + 1e-15 # float imprecision
+ );
+ my $decimal = ($unit % 3) == ($unit < 0);
+ $unit -= log($decimal ? .995 : .9995) / log(10); # rounded
+ $decimal = ($unit % 3) == ($unit < 0);
+ $decimal &&= $_[0] !~ /^-?0*[0-9]{1,3}$/; # integer 0..999
+ sprintf('%*.*f%1s',
+ 3 + ($_[0] < 0), # digits plus optional negative sign
+ $decimal, # tenths
+ $_[0] / 1000 ** int($unit/3), # number
+ $#{$opt{units}} * 1.5 < abs $unit ? sprintf('e%d', $unit) :
+ $opt{units}->[$unit/3] # suffix
+ );
+};
+
my (@lines, @values, @order);
+$SIG{$_} = \&show_stat for $opt{'signal-stat'} || ();
+$SIG{ALRM} = sub {
+ show_lines();
+ alarm $opt{interval} if defined $opt{interval} and $opt{interval} > 0;
+};
+$SIG{INT} = \&show_exit;
+
if (defined $opt{interval}) {
$opt{interval} ||= 1;
- $SIG{ALRM} = sub {
- show_lines();
- alarm $opt{interval};
- };
- alarm $opt{interval};
+ alarm $opt{interval} if $opt{interval} > 0;
eval {
require Tie::Array::Sorted;
} or warn $@, "Expect slowdown with large datasets!\n";
}
-$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) {
+my $valmatch = qr<
+ $opt{anchor} ( \h* -? [0-9]* [.]? [0-9]+ (?: e[+-]?[0-9]+ )? |)
+>x;
+while (defined ($_ = $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 $valnum if $opt{unmodified};
if ($trimpos <= 1) {
- $_ = substr $_, 0, 1;
+ $_ = substr $_, 0, 2;
}
elsif (length > $trimpos) {
- substr($_, $trimpos - 1) = '…';
+ # cut and replace (intentional lvalue for speed, contrary to PBP)
+ substr($_, $trimpos - 1) = $opt{ascii} ? '>' : '…';
}
}
push @lines, $_;
+ show_lines() if defined $opt{interval} and $opt{interval} < 0
+ and $. % $opt{interval} == 0;
+}
+
+if ($opt{'zero-missing'}) {
+ push @values, (0) x 10;
}
$SIG{INT} = 'DEFAULT';
sub show_lines {
-state $nr = $opt{hidemin} ? $opt{hidemin} - 1 : 0;
-@lines and @lines > $nr or return;
-@lines or return;
-@lines > $nr or return unless $opt{hidemin};
+state $nr =
+ $opt{hidemin} < 0 ? max(0, @lines + $opt{hidemin} + 1) :
+ $opt{hidemin};
+@lines > $nr or return;
+
+my $limit = $#lines;
+if (defined $opt{hidemax}) {
+ if ($opt{hidemin} and $opt{hidemin} < 0) {
+ $limit -= $opt{hidemax} - 1;
+ }
+ elsif ($opt{hidemax} <= $limit) {
+ $limit = $opt{hidemax} - 1;
+ }
+}
@order = sort { $b <=> $a } @order unless tied @order;
-my $maxval = ($opt{hidemax} ? max grep { length } @values[0 .. $opt{hidemax} - 1] : $order[0]) // 0;
-my $minval = min $order[-1] // (), 0;
+my $maxval = $opt{maxval} // (
+ $opt{hidemax} ? max grep { length } @values[$nr .. $limit] :
+ $order[0]
+) // 0;
+my $minval = $opt{minval} // min $order[-1] // (), 0;
+my $range = $maxval - $minval;
my $lenval = $opt{'value-length'} // max map { length } @order;
my $len = defined $opt{trim} && $opt{trim} <= 0 ? -$opt{trim} + 1 :
max map { length $values[$_] && length $lines[$_] }
0 .. min $#lines, $opt{hidemax} || (); # left padding
-my $size = ($maxval - $minval) &&
- ($opt{width} - $lenval - $len) / ($maxval - $minval); # bar multiplication
+my $size = defined $opt{width} && $range &&
+ ($opt{width} - $lenval - $len - !!$opt{indicators}) / $range; # bar multiplication
my @barmark;
-if ($opt{markers} // 1 and $size > 0) {
- my sub orderpos { (($order[$_[0]] + $order[$_[0] + .5]) / 2 - $minval) * $size }
- $barmark[ (sum(@order) / @order - $minval) * $size ] = '='; # average
- $barmark[ orderpos($#order * .31731) ] = '>';
- $barmark[ orderpos($#order * .68269) ] = '<';
- $barmark[ orderpos($#order / 2) ] = '+'; # mean
- $barmark[ -$minval * $size ] = '|' if $minval < 0; # zero
- color(36) for @barmark;
+if ($opt{markers} and $size > 0) {
+ for my $markspec (split /\h/, $opt{markers}) {
+ my ($char, $func) = split //, $markspec, 2;
+ my $pos = eval {
+ if ($func eq 'avg') {
+ return sum(@order) / @order;
+ }
+ elsif ($func =~ /\A([0-9.]+)v\z/) {
+ die "Invalid marker $char: percentile $1 out of bounds\n" if $1 > 100;
+ my $index = $#order * $1 / 100;
+ return ($order[$index] + $order[$index + .5]) / 2;
+ }
+ elsif ($func =~ /\A-?[0-9.]+\z/) {
+ return $func;
+ }
+ else {
+ die "Unknown marker $char: $func\n";
+ }
+ };
+ defined $pos or do {
+ warn $@ if $@;
+ next;
+ };
+ $pos -= $minval;
+ $pos >= 0 or next;
+ color(36) for $barmark[$pos * $size] = $char;
+ }
state $lastmax = $maxval;
if ($maxval > $lastmax) {
($lastmax - $minval) * $size + .5,
'-' x (($values[$nr - 1] - $minval) * $size);
print color(92);
- say '+' x (($maxval - $lastmax - $minval) * $size + .5);
+ say '+' x (($range - $lastmax) * $size + .5);
print color(0);
$lastmax = $maxval;
}
}
-@lines > $nr or return if $opt{hidemin};
-
-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',
- $float && ($unit % 3) == ($unit < 0), # tenths
- $_[0] / 1000 ** int($unit/3), # number
- $#{$opt{units}} * 1.5 < abs $unit ? "e$unit" : $opt{units}->[$unit/3]
- );
-}
+say(
+ color(31), sprintf('%*s', $lenval, $minval),
+ color(90), '-', color(36), '+',
+ color(32), sprintf('%*s', $size * $range - 3, $maxval),
+ color(90), '-', color(36), '+',
+ color(0),
+) if $opt{header};
-while ($nr <= $#lines) {
- $nr >= $opt{hidemax} and last if defined $opt{hidemax};
+while ($nr <= $limit) {
my $val = $values[$nr];
+ my $rel = length $val && $range && ($val - $minval) / $range;
+ my $color = !length $val || !$opt{palette} ? undef :
+ $val == $order[0] ? $opt{palette}->[-1] : # max
+ $val == $order[-1] ? $opt{palette}->[0] : # min
+ $opt{palette}->[ $rel * ($#{$opt{palette}} - 1) + 1 ];
+ my $indicator = $opt{indicators} && $opt{indicators}->[
+ !$val || !$#{$opt{indicators}} ? 0 : # blank
+ $#{$opt{indicators}} < 2 ? 1 :
+ $val >= $order[0] ? -1 :
+ $rel * ($#{$opt{indicators}} - 1e-14) + 1
+ ];
+
+ if ($opt{spark}) {
+ say '' if $opt{width} and $nr and $nr % $opt{width} == 0;
+ print color($color), $_ for $indicator;
+ next;
+ }
+ print $indicator if defined $indicator;
+
if (length $val) {
- 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 = $opt{'value-format'} ? $opt{'value-format'}->($val) :
+ sprintf "%*s", $lenval, $val;
color($color) for $val;
}
my $line = $lines[$nr] =~ s/\n/$val/r;
+ if (not length $val) {
+ say $line;
+ next;
+ }
printf '%-*s', $len + length($val), $line;
- print $barmark[$_] // '-' for 1 .. $size && (($values[$nr] || 0) - $minval) * $size + .5;
+ print $barmark[$_] // $opt{'graph-format'}
+ for 1 .. $size && (($values[$nr] || 0) - $minval) * $size + .5;
say '';
-
+}
+continue {
$nr++;
}
+say $opt{palette} ? color(0) : '' if $opt{spark};
+ return $nr;
}
-show_lines();
-if ($opt{stat}) {
+sub show_stat {
if ($opt{hidemin} or $opt{hidemax}) {
- $opt{hidemin} ||= 1;
- $opt{hidemax} ||= @lines;
- printf '%s of ', sum(@values[$opt{hidemin} - 1 .. $opt{hidemax} - 1]) // 0;
+ my $linemin = $opt{hidemin};
+ my $linemax = ($opt{hidemax} || @lines) - 1;
+ if ($linemin < 0) {
+ $linemin += @lines;
+ $linemax = @lines - $linemax;
+ }
+ printf '%.8g of ', $opt{'sum-format'}->(
+ sum(grep {length} @values[$linemin .. $linemax]) // 0
+ );
}
if (@order) {
my $total = sum @order;
- printf '%s total', $total;
- printf ' in %d values', scalar @values;
- printf ' (%s min, %*.*f avg, %s max)',
- $order[-1], 0, 2, $total / @order, $order[0];
+ printf '%s total', color(1) . $opt{'sum-format'}->($total) . color(0);
+ printf ' in %d values', scalar @order;
+ printf ' over %d lines', scalar @lines if @order != @lines;
+ printf(' (%s min, %s avg, %s max)',
+ color(31) . ($opt{'value-format'} || sub {$_[0]})->($order[-1]) . color(0),
+ color(36) . ($opt{'value-format'} || $opt{'calc-format'})->($total / @order) . color(0),
+ color(32) . ($opt{'value-format'} || sub {$_[0]})->($order[0]) . color(0),
+ );
}
say '';
+ return 1;
}
+sub show_exit {
+ show_lines();
+ show_stat() if $opt{stat};
+ exit 130 if @_; # 0x80+signo
+ exit;
+}
+
+show_exit();
+
__END__
+Usage: /\_/\
+ barcat [OPTIONS] [FILES|NUMBERS] (=•.•=)
+ (u u)
+Options:
+ -a, --[no-]ascii Restrict user interface to ASCII characters
+ -c, --[no-]color Force colored output of values and bar markers
+ -f, --field=(N|REGEXP) Compare values after a given number of whitespace
+ separators
+ --header Prepend a chart axis with minimum and maximum
+ values labeled
+ -H, --human-readable Format values using SI unit prefixes
+ -t, --interval[=(N|-LINES)]
+ Output partial progress every given number of
+ seconds or input lines
+ -l, --length=[-]SIZE[%] Trim line contents (between number and bars)
+ -L, --limit[=(N|-LAST|START-[END])]
+ Stop output after a number of lines
+ --graph-format=CHAR Glyph to repeat for the graph line
+ -m, --markers=FORMAT Statistical positions to indicate on bars
+ --min=N, --max=N Bars extend from 0 or the minimum value if lower
+ --palette=(PRESET|COLORS)
+ Override colors of parsed numbers
+ -_, --spark Replace lines by sparklines
+ --indicators[=CHARS] Prefix a unicode character corresponding to each
+ value
+ -s, --stat Total statistics after all data
+ -u, --unmodified Do not reformat values, keeping leading whitespace
+ --value-length=SIZE Reserved space for numbers
+ -w, --width=COLUMNS Override the maximum number of columns to use
+ -h, --usage Overview of available options
+ --help Full pod documentation
+ -V, --version Version information
+
=encoding utf8
=head1 NAME
-barcat - graph to visualize input values
+barcat - concatenate texts with graph to visualize values
=head1 SYNOPSIS
-B<barcat> [<options>] [<input>]
+B<barcat> [<options>] [<file>... | <numbers>]
=head1 DESCRIPTION
-Visualizes relative sizes of values read from input (file(s) or STDIN).
+Visualizes relative sizes of values read from input
+(parameters, file(s) or STDIN).
Contents are concatenated similar to I<cat>,
but numbers are reformatted and a bar graph is appended to each line.
+Don't worry, barcat does not drink and divide.
+It can has various options for input and output (re)formatting,
+but remains limited to one-dimensional charts.
+For more complex graphing needs
+you'll need a larger animal like I<gnuplot>.
+
=head1 OPTIONS
=over
+=item -a, --[no-]ascii
+
+Restrict user interface to ASCII characters,
+replacing default UTF-8 by their closest approximation.
+Input is always interpreted as UTF-8 and shown as is.
+
=item -c, --[no-]color
Force colored output of values and bar markers.
Defaults on if output is a tty,
disabled otherwise such as when piped or redirected.
-=item -f, --field=(<number>|<regexp>)
+=item -f, --field=(<number> | <regexp>)
Compare values after a given number of whitespace separators,
or matching a regular expression.
or capture the numbers itself,
for example I<-f'(\d+)'> for the first digits anywhere.
+=item --header
+
+Prepend a chart axis with minimum and maximum values labeled.
+
=item -H, --human-readable
Format values using SI unit prefixes,
Also changes an exponent I<1.602176634e-19> to I<160.2z>.
Short integers are aligned but kept without decimal point.
-=item -t, --interval[=<seconds>]
+=item -t, --interval[=(<seconds> | -<lines>)]
-Interval time to output partial progress.
+Output partial progress every given number of seconds or input lines.
+An update can also be forced by sending a I<SIGALRM> alarm signal.
=item -l, --length=[-]<size>[%]
Prepend a dash (i.e. make negative) to enforce padding
regardless of encountered contents.
-=item -L, --limit=(<count>|<start>-[<end>])
+=item -L, --limit[=(<count> | -<last> | <start>-[<end>])]
Stop output after a number of lines.
+A single value indicates the last line number (like C<head>),
+or first line counting from the bottom if negative (like C<tail>).
+A specific range can be given by two values.
+
All input is still counted and analyzed for statistics,
but disregarded for padding and bar size.
-=item -m, --markers=
+=item --graph-format=<character>
-Statistical positions to indicate on bars.
-Cannot be customized yet,
-only disabled by providing an empty argument.
+Glyph to repeat for the graph line.
+Defaults to a dash C<->.
-Any value enables all marker characters:
+=item -m, --markers=<format>
+
+Statistical positions to indicate on bars.
+A single indicator glyph precedes each position:
=over 2
-=item B<=>
+=item <number>
-Average:
-the sum of all values divided by the number of counted lines.
+Exact value to match on the axis.
+A vertical bar at the zero crossing is displayed by I<|0>
+for negative values.
+For example I<:3.14> would show a colon at pi.
-=item B<+>
+=item <percentage>I<v>
-Mean, median:
+Ranked value at the given percentile.
+The default shows I<+> at I<50v> for the mean or median;
the middle value or average between middle values.
+One standard deviation right of the mean is at about I<68.3v>.
+The default includes I<< >31.73v <68.27v >>
+to encompass all I<normal> results, or 68% of all entries, by B<< <--> >>.
-=item B<<>
+=item I<avg>
-Standard deviation left of the mean.
-Only 16% of all values are lower.
+Matches the average;
+the sum of all values divided by the number of counted lines.
+Indicated by default as I<=>.
-=item B<< > >>
+=back
-Standard deviation right of the mean.
-The part between B<< <--> >> encompass all I<normal> results,
-or 68% of all entries.
+=item --min=<number>, --max=<number>
-=back
+Bars extend from 0 or the minimum value if lower,
+to the largest value encountered.
+These options can be set to customize this range.
+
+=item --palette=(<preset> | <color>...)
+
+Override colors of parsed numbers.
+Can be any CSI escape, such as I<90> for default dark grey,
+or alternatively I<1;30> for bright black.
+
+In case of additional colors,
+the last is used for values equal to the maximum, the first for minima.
+If unspecified, these are green and red respectively (I<31 90 32>).
+Multiple intermediate colors will be distributed
+relative to the size of values.
+
+Predefined color schemes are named I<whites> and I<fire>,
+or I<greys> and I<fire256> for 256-color variants.
+
+=item -_, --spark
+
+Replace lines by I<sparklines>,
+single characters (configured by C<--indicators>)
+corresponding to input values.
+
+=item --indicators[=<characters>]
+
+Prefix a unicode character corresponding to each value.
+The first specified character will be used for non-values,
+the remaining sequence will be distributed over the range of values.
+Unspecified, block fill glyphs U+2581-2588 will be used.
=item -s, --stat
=item -u, --unmodified
-Do not strip leading whitespace.
+Do not reformat values, keeping leading whitespace.
Keep original value alignment, which may be significant in some programs.
=item --value-length=<size>
Override the maximum number of columns to use.
Appended graphics will extend to fill up the entire screen.
+=item -h, --usage
+
+Overview of available options.
+
+=item --help
+
+Full pod documentation
+as rendered by perldoc.
+
+=item -V, --version
+
+Version information.
+
=back
=head1 EXAMPLES
Memory usage of user processes with long names truncated:
- ps xo %mem,pid,cmd | barcat -l40
+ ps xo rss,pid,cmd | barcat -l40
Monitor network latency from prefixed results:
Commonly used after counting, for example users on the current server:
- users | sed 's/ /\n/g' | sort | uniq -c | barcat
+ users | tr ' ' '\n' | sort | uniq -c | barcat
Letter frequencies in text files:
Number of HTTP requests per day:
- cat log/access.log | cut -d\ -f4 | cut -d: -f1 | uniq -c | barcat
+ cat httpd/access.log | cut -d\ -f4 | cut -d: -f1 | uniq -c | barcat
Any kind of database query with counts, preserving returned alignment:
echo 'SELECT count(*),schemaname FROM pg_tables GROUP BY 2' |
psql -t | barcat -u
-External datasets, like movies per year:
+In PostgreSQL from within the client:
+
+ > SELECT sin(generate_series(0, 3, .1)) \g |barcat
- curl https://github.com/prust/wikipedia-movie-data/raw/master/movies.json |
- perl -054 -nlE 'say if s/^"year"://' | uniq -c | barcat
+Earthquakes worldwide magnitude 1+ in the last 24 hours:
-But please get I<jq> to process JSON
-and replace the manual selection by C<< jq '.[].year' >>.
+ curl https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/1.0_day.csv |
+ column -tns, | barcat -f4 -u -l80%
+
+External datasets, like movies per year:
+
+ curl https://github.com/prust/wikipedia-movie-data/raw/master/movies.json -L |
+ jq .[].year | uniq -c | barcat
Pokémon height comparison:
- curl https://github.com/Biuni/PokemonGO-Pokedex/raw/master/pokedex.json |
+ curl https://github.com/Biuni/PokemonGO-Pokedex/raw/master/pokedex.json -L |
jq -r '.pokemon[] | [.height,.num,.name] | join(" ")' | barcat
USD/EUR exchange rate from CSV provided by the ECB:
curl https://sdw.ecb.europa.eu/export.do \
-Gd 'node=SEARCHRESULTS&q=EXR.D.USD.EUR.SP00.A&exportType=csv' |
- grep '^[12]' | barcat -f',\K' --value-length=7
+ barcat -f',\K' --value-length=7
-Total population history from the World Bank dataset (XML):
-External datasets, like total population in XML from the World Bank:
+Total population history in XML from the World Bank:
curl http://api.worldbank.org/v2/country/1W/indicator/SP.POP.TOTL |
- xmllint --xpath '//*[local-name()="date" or local-name()="value"]' - |
- sed -r 's,</wb:value>,\n,g; s,(<[^>]+>)+, ,g' | barcat -f1 -H
+ xmlstarlet sel -t -m '*/*' -v wb:date -o ' ' -v wb:value -n |
+ barcat -f1 -H
And of course various Git statistics, such commit count by year:
git shortlog -sn | barcat -L3 -s
+Activity graph 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--' | barcat --spark
+
+Sparkline graphics of simple input given as inline parameters:
+
+ barcat -_ 3 1 4 1 5 0 9 2 4
+
+Misusing the spark functionality to draw a lolcat line:
+
+ seq $(tput cols) | barcat --spark --indicator=- --palette=rainbow
+
=head1 AUTHOR
Mischa POSLAWSKY <perl@shiar.org>
git.shiar.nl / barcat.git / blobdiff