Improve rpm group completion.

Displayed completions are still wrong but now at least real ones containing
spaces do work and unusual input does not cause grep errors.
http://lists.alioth.debian.org/pipermail/bash-completion-devel/2009-May/001486.html

CHANGES

@@ -87,6 +87,7 @@ bash-completion (1.x)
   * Split FreeBSD pkg_* completion to contrib/pkg_install.
   * Split FreeBSD portupgrade and friends completion to contrib/portupgrade.
   * Split Slackware pkgtools completion to contrib/pkgtools.
+  * Improve rpm group completion (displayed completions are still wrong).
 
   [ Todd Zullinger ]
   * Make yum complete on filenames after install, deplist, update and upgrade

contrib/rpm

@@ -22,13 +22,11 @@ _rpm_installed_packages()
 
 _rpm_groups()
 {
-	local IFS=$'\t'
-	# remove trailing backslash, or grep will complain
-	cur=${cur%"\\"}
-	COMPREPLY=( $( rpm -qa $nodig $nosig --queryformat '%{group}\n' | \
-		       grep "^$cur" ) )
-	# backslash escape spaces and translate newlines to tabs
-	COMPREPLY=( $( echo "${COMPREPLY[@]}" | sed 's/ /\\ /g' | tr '\n' '\t' ) )
+	# TODO: shown completions are wrong but real ones work nevertheless
+	# http://lists.alioth.debian.org/pipermail/bash-completion-devel/2009-May/001486.html
+	local IFS=$'\n'
+	COMPREPLY=( $( compgen -W "$( rpm -qa $nodig $nosig --queryformat \
+		'%{group}\n' )" -- $cur ) )
 }
 
 _rpm_nodigsig()