minimum limit to override start line number

[barcat.git] / barcat

diff --git a/barcat b/barcat
index 2901486fa5b155092681b72bd531970e2a19dc46..c4244d4e61d5e99d4c80d6432387782f27d4296d 100755 (executable)
--- a/barcat
+++ b/barcat
@@ -29,6 +29,10 @@ GetOptions(\%opt,
                $opt{trim} = $optval;
        },
        'value-length=i',
+       'hidemin=i',
+       'hidemax|limit|L=i' => sub {
+               $opt{$_[1] < 0 ? 'hidemin' : 'hidemax'} = abs $_[1];
+       },
        'markers|m=s',
        'unmodified|u!',
        'width|w=i',
@@ -75,15 +79,16 @@ $SIG{INT} = 'DEFAULT';
 
 sub show_lines {
 
-state $nr = 0;
+state $nr = $opt{hidemin} ? $opt{hidemin} - 1 : 0;
 @lines and @lines > $nr or return;
 
 my @order  = sort { $b <=> $a } grep { length } @values;
-my $maxval = $order[0];
+my $maxval = $opt{hidemax} ? max @values[0 .. $opt{hidemax} - 1] : $order[0];
 my $minval = min $order[-1], 0;
 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 .. $#lines;  # left padding
+       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
 
@@ -112,6 +117,7 @@ if ($opt{markers} // 1 and $size > 0) {
 }
 
 while ($nr <= $#lines) {
+       $nr >= $opt{hidemax} and last if $opt{hidemax};
        my $val = $values[$nr];
        if (length $val) {
                my $color = !$opt{color} ? 0 :
@@ -125,6 +131,7 @@ while ($nr <= $#lines) {
        printf '%-*s', $len + length($val), $line;
        print $barmark[$_] // '-' for 1 .. $size && (($values[$nr] || 0) - $minval) * $size + .5;
        say '';
+
        $nr++;
 }
 
@@ -183,6 +190,12 @@ unless C<--length=0>.
 Prepend a dash (i.e. make negative) to enforce padding
 regardless of encountered contents.
 
+=item -L, --limit=[-]<count>
+
+Stop output after a number of lines.
+All input is still counted and analyzed for statistics,
+but disregarded for padding and bar size.
+
 =item -m, --markers=
 
 Statistical positions to indicate on bars.
@@ -289,7 +302,7 @@ Git statistics, such commit count by year:
 
 Or the most frequent authors:
 
-    git shortlog -sn | barcat | head -3
+    git shortlog -sn | barcat -L3
 
 Latency history: