X-Git-Url: http://git.shiar.nl/barcat.git/blobdiff_plain/294ed868ffd8f4220acf264e7273918c56d159e7..a755882b1f5e89f6bd691219fe6de170cc6fcda7:/barcat diff --git a/barcat b/barcat index e875d07..1a1112c 100755 --- a/barcat +++ b/barcat @@ -4,26 +4,35 @@ 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 = '1.08'; -use Getopt::Long '2.33', qw( :config gnu_getopt ); my %opt; +if (@ARGV) { +require Getopt::Long; +Getopt::Long->import('2.33', qw( :config gnu_getopt )); GetOptions(\%opt, - 'color|c!', - 'C' => sub { $opt{color} = 0 }, + 'ascii|a!', + 'color|C!', + 'M' => 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 $_[0]/r; + s/\A[0-9]+\z/(?:\\S*\\h+){$_}\\K/; + s{\A[+]([0-9]*)\z}{ + (!!$1 && '(?:\d+\D+\b){'.$1.'}\K') . '\s* (?=\d)' + }e; + $opt{anchor} = qr/$_/; + } or die $@ =~ s/(?:\ at\ \N+)?\Z/ for option $_[0]/r; }, 'human-readable|H!', + 'sexagesimal!', 'interval|t:i', 'trim|length|l=s' => sub { my ($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 $optname", " (number or percentage expected)\n" ); @@ -37,8 +46,9 @@ GetOptions(\%opt, 'limit|L:s' => sub { my ($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" ); @@ -48,59 +58,46 @@ GetOptions(\%opt, 'graph-format=s' => sub { $opt{'graph-format'} = substr $_[1], 0, 1; }, - 'spark:s' => sub { - $opt{spark} = [split //, $_[1] || ' ▁▂▃▄▅▆▇█']; - }, + 'spark|_!', + 'indicators:s', 'palette=s' => sub { $opt{palette} = { + '' => [], fire => [qw( 90 31 91 33 93 97 96 )], - fire88 => [map {"38;5;$_"} qw( - 80 32 48 64 68 72 76 77 78 79 47 - )], fire256=> [map {"38;5;$_"} qw( 235 52 88 124 160 196 202 208 214 220 226 227 228 229 230 231 159 )], - ramp88 => [map {"38;5;$_"} qw( - 64 65 66 67 51 35 39 23 22 26 25 28 - )], whites => [qw( 1;30 0;37 1;37 )], - greys => [map {"38;5;$_"} 52, 235..255, 47], - }->{$_[1]} // [ split /[^0-9;]/, $_[1] ]; + greys => [map {"38;5;$_"} 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', - 'version' => sub { - say "barcat version $VERSION"; + 'version|V' => sub { + my $mascot = $opt{ascii} ? '=^,^=' : 'ฅ^•ﻌ•^ฅ'; + say "barcat $mascot version $VERSION"; exit; }, 'usage|h' => sub { - local $/; - 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/[.,](?=\n)//g; # trailing punctuation - $pod =~ s/^=item \K(?=--)/____/gm; # align long options - # abbreviate indicators - $pod =~ s/\Q>.../s>/g; - $pod =~ s/<(?:number|count|seconds)>/N/g; - $pod =~ s//\Uchar$1/g; - $pod =~ s/\Q | /|/g; - $pod =~ s/(?/\U$1/g; # uppercase - - require Pod::Usage; - my $parser = Pod::Usage->new(USAGE_OPTIONS => { - -indent => 2, -width => 78, - }); - $parser->select('SYNOPSIS', 'OPTIONS'); - $parser->output_string(\my $contents); - $parser->parse_string_document($pod); - - $contents =~ s/\n(?=\n\h)//msg; # strip space between items - $contents =~ s/^ \K____/ /gm; # nbsp substitute - print $contents; + /^=/ ? last : print for readline *DATA; # text between __END__ and pod exit; }, 'help|?' => sub { @@ -110,22 +107,52 @@ GetOptions(\%opt, ); }, ) or exit 64; # EX_USAGE +} $opt{width} ||= $ENV{COLUMNS} || qx(tput cols) || 80 unless $opt{spark}; -$opt{color} //= -t *STDOUT; # enable on tty +$opt{color} //= $ENV{NO_COLOR} ? 0 : -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 && $ARGV[0] =~ m/\A[-0-9]/ ? \@ARGV : undef +$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{sexagesimal} ? sub { + my $s = $_[0] + .5; + sprintf('%d:%02d:%02d', $s/3600, $s/60%60, $s%60); +} : $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'} || (); @@ -146,21 +173,23 @@ 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 > $trimpos) { - substr($_, $trimpos - 1) = '…'; + # cut and replace (intentional lvalue for speed, contrary to PBP) + substr($_, $trimpos - 1) = $opt{ascii} ? '>' : '…'; } } push @lines, $_; @@ -180,25 +209,26 @@ sub color { $_ = color(@_) . $_ . color(0) if defined; } -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] - ); -} - sub show_lines { -state $nr = $opt{hidemin}; -@lines or return; +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{maxval} // ( - $opt{hidemax} ? max grep { length } @values[0 .. $opt{hidemax} - 1] : + $opt{hidemax} ? max grep { length } @values[$nr .. $limit] : $order[0] ) // 0; my $minval = $opt{minval} // min $order[-1] // (), 0; @@ -207,8 +237,8 @@ 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 = $range && - ($opt{width} - $lenval - $len) / $range; # bar multiplication +my $size = defined $opt{width} && $range && + ($opt{width} - $lenval - $len - !!$opt{indicators}) / $range; # bar multiplication my @barmark; if ($opt{markers} and $size > 0) { @@ -219,13 +249,22 @@ if ($opt{markers} and $size > 0) { return sum(@order) / @order; } elsif ($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; } - else { + elsif ($func =~ /\A-?[0-9.]+\z/) { return $func; } - } - $minval; + 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; } @@ -252,32 +291,37 @@ say( 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 $rel = length $val && $range && min(1, ($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} && $opt{indicators}->[ + !length($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), $opt{spark}->[ - !$val ? 0 : # blank - $val == $order[0] ? -1 : # max - $val == $order[-1] ? 1 : # min - $#{$opt{spark}} < 3 ? 1 : - $rel * ($#{$opt{spark}} - 3) + 2.5 - ]; + print color($color), $_ for $indicator; next; } + print $indicator if defined $indicator; if (length $val) { - $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 $barmark[$_] // $opt{'graph-format'} for 1 .. $size && (($values[$nr] || 0) - $minval) * $size + .5; @@ -288,26 +332,34 @@ continue { } say $opt{palette} ? color(0) : '' if $opt{spark}; + return $nr; } sub show_stat { if ($opt{hidemin} or $opt{hidemax}) { - printf '%s of ', sum(grep { length } - @values[$opt{hidemin} .. ($opt{hidemax} || @lines) - 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', color(1) . sprintf('%.8g', $total) . color(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) . $order[-1] . color(0), - color(36) . (sprintf '%*.*f', 0, 2, $total / @order) . color(0), - color(32) . $order[0] . color(0), + color(31) . ($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 { @@ -320,11 +372,46 @@ sub show_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 + --sexagesimal Convert seconds to HH:MM:SS time format + -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 @@ -347,13 +434,21 @@ you'll need a larger animal like I. =over -=item -c, --[no-]color +=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. +Can also be disabled by setting I<-M> +or the I environment variable. -=item -f, --field=( | ) +=item -f, --field=([+] | ) Compare values after a given number of whitespace separators, or matching a regular expression. @@ -364,6 +459,7 @@ A string can indicate the starting position of a value (such as I<-f:> if preceded by colons), or capture the numbers itself, for example I<-f'(\d+)'> for the first digits anywhere. +A shorthand for this is I<+0>, or I<+N> to find the Nth number. =item --header @@ -376,6 +472,10 @@ turning long numbers like I<12356789> into I<12.4M>. Also changes an exponent I<1.602176634e-19> to I<160.2z>. Short integers are aligned but kept without decimal point. +=item --sexagesimal + +Convert seconds to HH:MM:SS time format. + =item -t, --interval[=( | -)] Output partial progress every given number of seconds or input lines. @@ -391,9 +491,13 @@ unless C<--length=0>. Prepend a dash (i.e. make negative) to enforce padding regardless of encountered contents. -=item -L, --limit[=( | -[])] +=item -L, --limit[=( | - | -[])] Stop output after a number of lines. +A single value indicates the last line number (like C), +or first line counting from the bottom if negative (like C). +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. @@ -454,16 +558,17 @@ relative to the size of values. Predefined color schemes are named I and I, or I and I for 256-color variants. -=item --spark[=] +=item -_, --spark Replace lines by I, -single characters corresponding to input values. -A specified sequence of unicode characters will be used for -Of a specified sequence of unicode characters, -the first one will be used for non-values, -the last one for the maximum, -the second (if any) for the minimum, -and any remaining will be distributed over the range of values. +single characters (configured by C<--indicators>) +corresponding to input values. + +=item --indicators[=] + +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 @@ -490,10 +595,10 @@ Overview of available options. =item --help -Full documentation -rendered by perldoc. +Full pod documentation +as rendered by perldoc. -=item --version +=item -V, --version Version information. @@ -509,9 +614,23 @@ Compare file sizes (with human-readable numbers): du -d0 -b * | barcat -H +Same from formatted results, selecting the first numeric value: + + tree -s --noreport | barcat -H -f+ + +Compare media metadata, like image size or play time: + + exiftool -T -p '$megapixels ($imagesize) $filename' * | barcat + + exiftool -T -p '$duration# $avgbitrate# $filename' * | barcat --sexagesimal + + find -type f -print0 | xargs -0 -L1 \ + ffprobe -show_format -of json -v error | + jq -r '.format|.duration+" "+.bit_rate+" "+.filename' | barcat --sex + 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: @@ -529,7 +648,7 @@ 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: @@ -538,37 +657,39 @@ Any kind of database query with counts, preserving returned alignment: In PostgreSQL from within the client: - postgres=> SELECT sin(generate_series(0, 3, .1)) \g |barcat + > 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 | + 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 | - perl -054 -nlE 'say if s/^"year"://' | uniq -c | barcat - -But please get I to process JSON -and replace the manual selection by C<< jq '.[].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 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,,\n,g; s,(<[^>]+>)+, ,g' | barcat -f1 -H + xmlstarlet sel -t -m '*/*' -v wb:date -o ' ' -v wb:value -n | + barcat -f1 -H + +Population and other information for all countries: + + curl http://download.geonames.org/export/dump/countryInfo.txt | + grep -v '^#\s' | column -tns$'\t' | barcat -f+2 -u -l150 -s And of course various Git statistics, such commit count by year: @@ -578,16 +699,20 @@ Or the top 3 most frequent authors with statistics over all: git shortlog -sn | barcat -L3 -s -Sparkline graphics of simple input given as inline parameters: - - barcat --spark= 3 1 4 1 5 0 9 2 4 - 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