shorthand -C to disable color

[barcat.git] / graph

diff --git a/graph b/graph
index e76ec645492b138a49ddfb11a52f1adf2e4b2088..814486885f5245974c44a5f58c4cc9e93b8f5ded 100755 (executable)
--- a/graph
+++ b/graph
@@ -1,9 +1,10 @@
 #!/usr/bin/env perl
-use 5.014;
+use 5.018;
 use warnings;
 use utf8;
 use List::Util qw( min max sum );
 use open qw( :std :utf8 );
+use experimental qw( lexical_subs );
 
 our $VERSION = '1.02';
 
@@ -12,10 +13,20 @@ sub podexit {
        require Pod::Usage;
        Pod::Usage::pod2usage(-exitval => 0, -perldocopt => '-oman', @_);
 }
-GetOptions(\my %opt,
+my %opt;
+GetOptions(\%opt,
        'color|c!',
-       'follow|f:i',
-       'trim|length|l=i',
+       'C' => sub { $opt{color} = 0 },
+       'interval|t:i',
+       'trim|length|l=s' => sub {
+               my ($optname, $optval) = @_;
+               $optval =~ s/%$// and $opt{trimpct}++;
+               $optval =~ m/^-?[0-9]+$/ or die(
+                       "Value \"$optval\" invalid for option $optname",
+                       " (number or percentage expected)\n"
+               );
+               $opt{trim} = $optval;
+       },
        'markers|m=s',
        'unmodified|u!',
        'width|w=i',
@@ -25,14 +36,15 @@ GetOptions(\my %opt,
 
 $opt{width} ||= $ENV{COLUMNS} || 80;
 $opt{color} //= -t *STDOUT;  # enable on tty
+$opt{trim}   *= $opt{width} / 100 if $opt{trimpct};
 
-if (defined $opt{follow}) {
-       $opt{follow} ||= 1;
+if (defined $opt{interval}) {
+       $opt{interval} ||= 1;
        $SIG{ALRM} = sub {
                show_lines();
-               alarm $opt{follow};
+               alarm $opt{interval};
        };
-       alarm $opt{follow};
+       alarm $opt{interval};
 }
 
 $SIG{INT} = 'IGNORE';  # continue after assumed eof
@@ -53,13 +65,13 @@ while (readline) {
        }
        push @lines, $_;
 }
-@lines or exit;
 
 $SIG{INT} = 'DEFAULT';
 
 sub show_lines {
 
 state $nr = 0;
+@lines and @lines > $nr or return;
 
 my @order  = sort { $b <=> $a } grep { length } @values;
 my $maxval = $order[0];
@@ -138,11 +150,11 @@ 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, --follow[=<seconds>]
+=item -t, --interval[=<seconds>]
 
-Interval to output partial progress.
+Interval time to output partial progress.
 
-=item -l, --length=[-]<size>
+=item -l, --length=[-]<size>[%]
 
 Trim line contents (between number and bars)
 to a maximum number of characters.
@@ -226,6 +238,28 @@ Any kind of database query with leading counts:
     echo 'SELECT count(*),schemaname FROM pg_tables GROUP BY 2' |
     psql -t | graph -u
 
+Exchange rate USD/EUR history from CSV download provided by ECB:
+
+    curl https://sdw.ecb.europa.eu/export.do \
+         -Gd 'node=SEARCHRESULTS&q=EXR.D.USD.EUR.SP00.A&exportType=csv' |
+    awk -F, '{RS="\r\n"} /^[12]/{print $2,$1}' | graph
+
+Total population history from the World Bank dataset (XML):
+
+    curl http://api.worldbank.org/v2/country/1W/indicator/SP.POP.TOTL |
+    xmllint --xpath '//*[local-name()="date" or local-name()="value"]' - |
+    awk -F'<[^>]+>' 'BEGIN {RS="</wb:value>"} {print $4,$2}' | graph
+
+Movies per year from prepared JSON data:
+
+    curl https://github.com/prust/wikipedia-movie-data/raw/master/movies.json |
+    jq '.[].year' | uniq -c | graph
+
+Pokémon height comparison:
+
+       curl https://github.com/Biuni/PokemonGO-Pokedex/raw/master/pokedex.json |
+       jq -r '.pokemon[] | [.height,.num,.name] | join(" ")' | graph
+
 Git statistics, such commit count by year:
 
     git log --pretty=%ci | cut -b-4 | uniq -c | graph
@@ -237,7 +271,7 @@ Or the most frequent authors:
 Latency history:
 
     ping google.com |
-    perl -pe '$|=1; print s/ time=(.*)// ? "$1 for " : "> "' | graph -f
+    perl -pe '$|=1; print s/ time=(.*)// ? "$1 for " : "> "' | graph -t
 
 =head1 AUTHOR