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Date:      Sat, 19 Feb 2011 16:42:00 -0800
From:      Chip Camden <sterling@camdensoftware.com>
To:        FreeBSD Mailing List <freebsd-questions@FreeBSD.ORG>
Subject:   Re: variable line-display pager?
Message-ID:  <20110220004200.GC2495@libertas.local.camdensoftware.com>
In-Reply-To: <20110220002300.GA21231@thought.org>
References:  <20110219233736.GA20393@thought.org> <20110219235240.GA2495@libertas.local.camdensoftware.com> <20110220002300.GA21231@thought.org>
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Quoth Gary Kline on Saturday, 19 February 2011:
> On Sat, Feb 19, 2011 at 03:52:40PM -0800, Chip Camden wrote:
> > Quoth Gary Kline on Saturday, 19 February 2011:
> > > Need help findind a way of using existing unix utilities to diplay
> > > chunks of N lines of a text files.  Here N <=3D the number of lines in
> > > the file.
> > >=20
> > > For instance, say that my xterm/console/"Konsole" is 80x53 lines.
> > > My text file is around 200 lines long and I want to use more or less
> > > or some GUI pager to display only 15 lines at one time.  Tapping the=
=20
> > > space bar would display another 15 lines and so on until EOF.  Is
> > > there a way of doing with with flags of the existing /usr/bin/less
> > > or is there some other pager that I can build?
> > >=20
> > > thanks,
> > >=20
> > > gary
> > >=20
> > >=20
> > >=20
> > > --=20
> > >  Gary Kline  kline@thought.org  http://www.thought.org  Public Servic=
e Unix
> > >            Journey Toward the Dawn, E-Book: http://www.thought.org
> > >           The 7.98a release of Jottings: http://jottings.thought.org
> > >=20
> > > _______________________________________________
> > > freebsd-questions@freebsd.org mailing list
> > > http://lists.freebsd.org/mailman/listinfo/freebsd-questions
> > > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freeb=
sd.org"
> >=20
> > The -z option is supposed to do this:
> >=20
> > less -z15 file.txt
> >=20
> > But it appears to work only on the second and successive pages.
>=20
>=20
>=20
> Oh.  So _that's_ why.  I tried less -m 15 [because the man pages
> sais z=3DN;  i just tried what you did with -z15.  Full page first
> time, 15 lines each spacebar thereafter.
>=20
> Zank you, Sir Chip.. Anybody else?   I'm loathe to use anything gui,
> but here's  where I'll be happy w ith something GUI THat i can
> squeeze my "15" or small-n lines' worth into.  Can'y believe that
> there is nothing for all theses years....  I mean, geewhiz!
> Any idea where I Should look in ports or how to google this?
>=20
>=20
> gary
>=20
> >=20
> > --=20
> > Sterling (Chip) Camden | sterling@camdensoftware.com | 2048D/3A978E4F
> > http://chipsquips.com  | http://camdensoftware.com   | http://chipstips=
.com
>=20
>=20
>=20
> --=20
>  Gary Kline  kline@thought.org  http://www.thought.org  Public Service Un=
ix
>            Journey Toward the Dawn, E-Book: http://www.thought.org
>           The 7.98a release of Jottings: http://jottings.thought.org
>=20
> _______________________________________________
> freebsd-questions@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
> To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.o=
rg"

Is this sort of what you're looking for?

#!/usr/bin/env ruby
require 'optparse'

pagesize =3D 15

optparse =3D OptionParser.new do |opts|
  opts.banner =3D 'usage: npg [-n pagesize] file...'

  opts.on('-n', '--numlines pagesize', 'Specify page size in number of line=
s') do |n|
    pagesize =3D n
  end

end

begin
  optparse.parse!
rescue OptionParser::InvalidOption, OptionParser::MissingArgument =3D> e
  puts e
  puts optparse
  exit 1
end

loop do
  pagesize.times do
    if line =3D gets
      puts line
    else
      exit
    end
  end
  print "More..."
  STDIN.getc
end

--=20
Sterling (Chip) Camden | sterling@camdensoftware.com | 2048D/3A978E4F
http://chipsquips.com  | http://camdensoftware.com   | http://chipstips.com

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