Add optfeature to eutils.eclass wrt bug 498988, ACKed by WilliamH

1 files changed, 46 insertions, 1 deletions

diff --git a/eclass/eutils.eclass b/eclass/eutils.eclass
index 53ae2e45f4ac..82c6117ed40f 100644
--- a/eclass/eutils.eclass
+++ b/eclass/eutils.eclass
@@ -1,6 +1,6 @@
 # Copyright 1999-2013 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
-# $Header: /var/cvsroot/gentoo-x86/eclass/eutils.eclass,v 1.431 2014/01/08 06:46:18 vapier Exp $
+# $Header: /var/cvsroot/gentoo-x86/eclass/eutils.eclass,v 1.432 2014/03/15 00:47:42 creffett Exp $
 
 # @ECLASS: eutils.eclass
 # @MAINTAINER:
@@ -1729,4 +1729,49 @@ einstalldocs() {
 
 check_license() { die "you no longer need this as portage supports ACCEPT_LICENSE itself"; }
 
+# @FUNCTION: optfeature
+# @USAGE: <short description> <package atom to match> [other atoms]
+# @DESCRIPTION:
+# Print out a message suggesting an optional package (or packages) which
+# provide the described functionality
+#
+# The following snippet would suggest app-misc/foo for optional foo support,
+# app-misc/bar or app-misc/baz[bar] for optional bar support
+# and either both app-misc/a and app-misc/b or app-misc/c for alphabet support.
+# @CODE:
+# 		optfeature "foo support" app-misc/foo
+# 		optfeature "bar support" app-misc/bar app-misc/baz[bar]
+#		optfeature "alphabet support" "app-misc/a app-misc/b" app-misc/c
+#
+optfeature() {
+	debug-print-function ${FUNCNAME} "$@"
+	local i j msg
+	local desc=$1
+	local flag=0
+	shift
+	for i; do
+		for j in $i; do
+			if has_version "$j"; then
+				flag=1
+			else
+				flag=0
+				break
+			fi
+		done
+		if [[ $flag -eq 1 ]]; then
+			break
+		fi
+	done
+	if [[ $flag -eq 0 ]]; then
+		for i; do
+			msg=" "
+			for j in $i; do
+				msg="${msg} ${j} and"
+			done
+			msg="${msg:0: -4} for ${desc}"
+			elog "${msg}"
+		done
+	fi
+}
+
 fi