field (-f) option to select later values

[barcat.git] / graph

diff --git a/graph b/graph
index 8bf473ddd4e8440b69771479ad4e2506dd92dfcc..fd49acfee092c438801bb21d332037534de0e041 100755 (executable)
--- a/graph
+++ b/graph
@@ -16,7 +16,9 @@ sub podexit {
 my %opt;
 GetOptions(\%opt,
        'color|c!',
-       'follow|f:i',
+       'C' => sub { $opt{color} = 0 },
+       'field|f=i',
+       'interval|t:i',
        'trim|length|l=s' => sub {
                my ($optname, $optval) = @_;
                $optval =~ s/%$// and $opt{trimpct}++;
@@ -37,22 +39,23 @@ $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
 
 my (@lines, @values);
+my $anchor = $opt{field} ? qr/(?:\S*\h+){$opt{field}}\K/ : qr/^/;
 while (readline) {
        s/\r?\n\z//;
        s/^\h*// unless $opt{unmodified};
-       push @values, s/^ ( \h* -? [0-9]* \.? [0-9]+ |)//x && $1;
+       push @values, s/$anchor ( \h* -? [0-9]* \.? [0-9]+ |)/\n/x && $1;
        if (defined $opt{trim}) {
                my $trimpos = abs $opt{trim};
                if ($trimpos <= 1) {
@@ -77,7 +80,7 @@ my $maxval = $order[0];
 my $minval = min $order[-1], 0;
 my $lenval = max map { length } @order;
 my $len    = defined $opt{trim} && $opt{trim} <= 0 ? -$opt{trim} + 1 :
-       1 + max map { length } @lines;  # left padding
+       max map { length $values[$_] && length $lines[$_] } 0 .. $#lines;  # left padding
 my $size   = ($maxval - $minval) &&
        ($opt{width} - $lenval - $len) / ($maxval - $minval);  # bar multiplication
 
@@ -112,12 +115,12 @@ while ($nr <= $#lines) {
                        $val == $order[0] ? 32 : # max
                        $val == $order[-1] ? 31 : # min
                        90;
-               printf "\e[%sm", $color if $color;
-               printf "%*s", $lenval, $val;
-               print "\e[0m" if $color;
+               $val = sprintf "%*s", $lenval, $val;
+               $val = "\e[${color}m$val\e[0m" if $color;
        }
-       printf '%-*s', $len, $lines[$nr];
-       print $barmark[$_] // '-' for 1 .. $size && (($val || 0) - $minval) * $size;
+       $lines[$nr] =~ s/\n/$val/;
+       printf '%-*s', $len + length($val), $lines[$nr];
+       print $barmark[$_] // '-' for 1 .. $size && (($values[$nr] || 0) - $minval) * $size;
        say '';
        $nr++;
 }
@@ -137,7 +140,9 @@ B<graph> [<options>] [<input>]
 
 =head1 DESCRIPTION
 
-Each line starting with a number is given a bar to visualise relative sizes.
+Visualizes relative sizes of values read from input (file(s) or STDIN).
+Contents are concatenated similar to I<cat>,
+but numbers are reformatted and a bar graph is appended to each line.
 
 =head1 OPTIONS
 
@@ -149,9 +154,15 @@ 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 -f, --field=<number>
 
-Interval to output partial progress.
+Compare values after a given number of whitespace separators.
+Unspecified or I<-f0> means values are at the start of each line.
+With I<-f1> the second word is taken instead.
+
+=item -t, --interval[=<seconds>]
+
+Interval time to output partial progress.
 
 =item -l, --length=[-]<size>[%]
 
@@ -241,13 +252,13 @@ 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
+    awk -F, '{RS="\r\n"} /^[12]/{print $1,$2}' | graph -f1
 
 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
+    sed -r 's,</wb:value>,\n,g; s,(<[^>]+>)+, ,g' | graph -f1
 
 Movies per year from prepared JSON data:
 
@@ -270,7 +281,7 @@ 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