Patch for xpath script in Gentoo (comments in spanish)

parche_xpath.diff

# Parche para el script ejecutable de xpath. Aplíquese en Gentoo o en cualquier
# instalación cuyo hash de archivo sea acb44c08365e33b1bd0feab421c75167 (se comprueba
# con "md5sum /ruta/hacia/xpath")
#
# Como aplicarlo
# ==============
# wget https://gist.githubusercontent.com/aaferrari/2bee720d1b8bac7a09ee/raw/parche_xpath.diff\
# && sudo patch /usr/bin/xpath parche_xpath.diff
#
# Como revertirlo
# ===============
# sudo patch -R /usr/bin/xpath parche_path.diff
#
# Acerca de este parche
# =====================
# El código para elaborar este parche fue extraído del paquete
# http://ftp.univ-nantes.fr/ubuntu/pool/main/libx/libxml-xpath-perl/libxml-xpath-perl_1.13-7_all.deb
--- /usr/bin/xpath	2014-11-27 01:02:45.585259229 -0300
+++ /home/usuario/xpath	2010-01-18 04:58:18.000000000 -0300
@@ -2,76 +2,117 @@
 
 eval 'exec /usr/bin/perl -w -S $0 ${1+"$@"}'
     if 0; # not running under some shell
+
+eval 'exec /usr/bin/perl -w -S $0 ${1+"$@"}'
+    if 0; # not running under some shell
 use strict;
 
 $| = 1;
 
-unless (@ARGV >= 1) {
-	print STDERR qq(Usage:
-$0 [filename] query
-				
-	If no filename is given, supply XML on STDIN.
-);
-	exit;
-}
-
 use XML::XPath;
 
-my $xpath;
-
+my @paths;
 my $pipeline;
+my $SUFFIX = "\n";
+my $PREFIX = "";
+my $quiet = 0;
 
-if ($ARGV[0] eq '-p') {
-	# pipeline mode
-	$pipeline = 1;
-	shift @ARGV;
-}
-if (@ARGV >= 2) {
-	$xpath = XML::XPath->new(filename => shift(@ARGV));
-}
-else {
-	$xpath = XML::XPath->new(ioref => \*STDIN);
+
+PARSE: while ((@ARGV >= 1) && ($ARGV[0] =~ /^-./ )) {
+	OPTIONS: {
+		if ($ARGV[0] eq "-e") {
+			shift;
+			push @paths, shift;
+			last OPTIONS;
+		}
+		if ($ARGV[0] eq "-p") {
+			shift;
+			$PREFIX = shift;
+			last OPTIONS;
+		}
+		if ($ARGV[0] eq "-s") {
+			shift;
+			$SUFFIX = shift;
+			last OPTIONS;
+		}
+		if ($ARGV[0] eq "-q") {
+			$quiet = 1;
+			shift;
+			last OPTIONS;
+		}
+		print STDERR "Unknown option ignore: ", shift;
+	}
 }
 
-my $nodes = $xpath->find(shift @ARGV);
+unless (@paths >= 1) {
+	print STDERR qq(Usage:
+$0 [options] -e query [-e query...] [filename...]
 
-unless ($nodes->isa('XML::XPath::NodeSet')) {
-NOTNODES:
-	print STDERR "Query didn't return a nodeset. Value: ";
-	print $nodes->value, "\n";
+	If no filenams are given, supply XML on STDIN.
+	You must provide at least one query. Each supplementary
+	query is done in order, the previous query giving the
+	context of the next one.
+
+	Options:
+
+	-q		quiet. Only output the resulting PATH
+	-s suffix	use suffix instead of linefeed.
+	-p postfix	use prefix instead of nothing.
+);
 	exit;
 }
 
-if ($pipeline) {
-	$nodes = find_more($nodes);
-	goto NOTNODES unless $nodes->isa('XML::XPath::NodeSet');
-}
+do
+{
+	my $xpath;
+	my @curpaths = @paths;
+	my $filename;
+	if (@ARGV >= 1) {
+		$filename = shift @ARGV;
+		$xpath = XML::XPath->new(filename => $filename);
+	}
+	else {
+		$filename = 'stdin';
+		$xpath = XML::XPath->new(ioref => \*STDIN);
+	}
 
-if ($nodes->size) {
-	print STDERR "Found ", $nodes->size, " nodes:\n";
-	foreach my $node ($nodes->get_nodelist) {
-		print STDERR "-- NODE --\n";
-		print $node->toString;
+	my $nodes = $xpath->find(shift @curpaths);
+
+	if ($nodes->isa('XML::XPath::NodeSet')) {
+		while (@curpaths >= 1) {
+			$nodes = find_more($xpath, shift @curpaths, $nodes);
+			last unless $nodes->isa('XML::XPath::NodeSet');
+		}
+	}
+
+	if ($nodes->isa('XML::XPath::NodeSet')) {
+		if ($nodes->size) {
+			print STDERR "Found ", $nodes->size, " nodes in $filename:\n" unless $quiet;
+			foreach my $node ($nodes->get_nodelist) {
+				print STDERR "-- NODE --\n" unless $quiet;
+				print $PREFIX, $node->toString, $SUFFIX;
+			}
+		}
+		else {
+			print STDERR "No nodes found in $filename\n" unless $quiet;
+		}
+	}
+	else {
+		print STDERR "Query didn't return a nodeset. Value: ";
+		print $nodes->value, "\n";
 	}
-}
-else {
-	print STDERR "No nodes found";
-}
 
-print STDERR "\n";
+} until (@ARGV < 1);
 
 exit;
 
 sub find_more {
+	my $xpath = shift;
+	my $find = shift;
 	my ($nodes) = @_;
-	if (!@ARGV) {
-		return $nodes;
-	}
 	
 	my $newnodes = XML::XPath::NodeSet->new;
 	
-	my $find = shift @ARGV;
-	
 	foreach my $node ($nodes->get_nodelist) {
 		my $new = $xpath->find($find, $node);
 		if ($new->isa('XML::XPath::NodeSet')) {
@@ -82,5 +123,83 @@
 		}
 	}
 	
-	return find_more($newnodes);
+	return $newnodes;
 }
+
+__END__
+
+=head1 NAME
+
+xpath - a script to query XPath statements in XML documents.
+
+=head1 SYNOPSIS
+
+B<xpath [-s suffix] [-p prefix] [-q] -e query [-e query] ... [file] ...>
+
+=head1 DESCRIPTION
+
+B<xpath> uses the L<XML::XPath|XML::XPath> perl module to make XPath queries
+to any XML document. The L<XML::XPath|XML::XPath> module aims to comply exactly
+to the XPath specification at C<http://www.w3.org/TR/xpath> and yet
+allows extensions to be added in the form of functions.
+
+The script takes any number of XPath pointers and tries to apply them
+to each XML document given on the command line. If no file arguments
+are given, the query is done using C<STDIN> as an XML document.
+
+When multiple queries exist, the result of the last query is used as
+context for the next query and only the result of the last one is output.
+The context of the first query is always the root of the current document.
+
+=head1 OPTIONS
+
+=head2 B<-q>
+
+Be quiet. Output only errors (and no separator) on stderr.
+
+=head2 B<-s suffix>
+
+Place C<suffix> at the end of each entry. Default is a linefeed.
+
+=head2 B<-p prefix>
+
+Place C<prefix> preceding each entry. Default is nothing.
+
+=head1 BUGS
+
+The author of this man page is not very fluant in english. Please,
+send him (L<fabien@tzone.org>) any corrections concerning this text.
+
+See also L<XML::XPath(3pm)>.
+
+=head1 SEE ALSO
+
+L<XML::XPath(3pm)>.
+
+=head1 HISTORY
+
+This module is copyright 2000 Fastnet Software Ltd. This is free
+software, and as such comes with NO WARRANTY. No dates are used in this
+module. You may distribute this module under the terms of either the
+Gnu GPL,  or under specific licencing from Fastnet Software Ltd.
+Special free licencing consideration will be given to similarly free
+software. Please don't flame me for this licence - I've put a lot of
+hours into this code, and if someone uses my software in their product
+I expect them to have the courtesy to contact me first.
+
+Full support for this module is available from Fastnet Software Ltd on
+a pay per incident basis. Alternatively subscribe to the Perl-XML
+mailing list by mailing lyris@activestate.com with the text:
+
+	SUBSCRIBE Perl-XML
+
+in the body of the message. There are lots of friendly people on the
+list, including myself, and we'll be glad to get you started.
+
+Matt Sergeant, matt@sergeant.org
+
+This man page was added as well as some serious modifications to the script
+by Fabien Ninoles <fabien@debian.org> for the Debian Project.
+
+=cut
+