[patch] add an iuse_expand() function to eutils.eclass

eutils.eclass.patch (text/plain), 669 bytes, created by Zac Medico on 2006-05-30 18:14:51 UTC

--- eutils.eclass.orig	2006-05-26 23:20:11.000000000 -0700
+++ eutils.eclass	2006-05-30 18:00:58.000000000 -0700
@@ -1669,3 +1669,17 @@
 		newbin "${tmpwrapper}" "${wrapper}"
 	fi
 }
+
+# iuse_expand
+#
+# Grab all IUSE_* variables from the environment, automatically expand them,
+# and add them to IUSE.  The IUSE_* variable names should end with the name
+# of a USE_EXPAND variable such as VIDEO_CARDS.
+iuse_expand()
+	local exp_var exp_var_prefix exp_var_val
+	for exp_var in ${!IUSE_*}; do
+		exp_var_prefix="$(echo ${exp_var/IUSE_/} | tr '[A-Z]' '[a-z]')_"
+		for exp_var_val in ${!exp_var}; do
+			IUSE="${IUSE} ${exp_var_prefix}${exp_var_val}"
+		done
+	done