1 files changed, 97 insertions, 0 deletions
diff --git a/contrib/perl5/lib/Text/Tabs.pm b/contrib/perl5/lib/Text/Tabs.pm
new file mode 100644
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+++ b/contrib/perl5/lib/Text/Tabs.pm
@@ -0,0 +1,97 @@
+
+package Text::Tabs;
+
+require Exporter;
+
+@ISA = (Exporter);
+@EXPORT = qw(expand unexpand $tabstop);
+
+use vars qw($VERSION $tabstop $debug);
+$VERSION = 96.121201;
+
+use strict;
+
+BEGIN	{
+	$tabstop = 8;
+	$debug = 0;
+}
+
+sub expand
+{
+	my @l = @_;
+	for $_ (@l) {
+		1 while s/(^|\n)([^\t\n]*)(\t+)/
+			$1. $2 . (" " x 
+				($tabstop * length($3)
+				- (length($2) % $tabstop)))
+			/sex;
+	}
+	return @l if wantarray;
+	return $l[0];
+}
+
+sub unexpand
+{
+	my @l = @_;
+	my @e;
+	my $x;
+	my $line;
+	my @lines;
+	my $lastbit;
+	for $x (@l) {
+		@lines = split("\n", $x, -1);
+		for $line (@lines) {
+			$line = expand($line);
+			@e = split(/(.{$tabstop})/,$line,-1);
+			$lastbit = pop(@e);
+			$lastbit = '' unless defined $lastbit;
+			$lastbit = "\t"
+				if $lastbit eq " "x$tabstop;
+			for $_ (@e) {
+				if ($debug) {
+					my $x = $_;
+					$x =~ s/\t/^I\t/gs;
+					print "sub on '$x'\n";
+				}
+				s/  +$/\t/;
+			}
+			$line = join('',@e, $lastbit);
+		}
+		$x = join("\n", @lines);
+	}
+	return @l if wantarray;
+	return $l[0];
+}
+
+1;
+__END__
+
+
+=head1 NAME
+
+Text::Tabs -- expand and unexpand tabs per the unix expand(1) and unexpand(1)
+
+=head1 SYNOPSIS
+
+use Text::Tabs;
+
+$tabstop = 4;
+@lines_without_tabs = expand(@lines_with_tabs);
+@lines_with_tabs = unexpand(@lines_without_tabs);
+
+=head1 DESCRIPTION
+
+Text::Tabs does about what the unix utilities expand(1) and unexpand(1)
+do.  Given a line with tabs in it, expand will replace the tabs with
+the appropriate number of spaces.  Given a line with or without tabs in
+it, unexpand will add tabs when it can save bytes by doing so.  Invisible
+compression with plain ascii!
+
+=head1 BUGS
+
+expand doesn't handle newlines very quickly -- do not feed it an
+entire document in one string.  Instead feed it an array of lines.
+
+=head1 AUTHOR
+
+David Muir Sharnoff <muir@idiom.com>