Added support to replace packages with another one. Package metadata

uses an array of strings that lists the packages that should be
removed before new package can be installed.

In the build templates one can use: replaces="foo foo-blah foo-libs".

--HG--
extra : convert_revision : xtraeme%40gmail.com-20091017022643-rdyrp9kvmx3m0p0h

shutils/metadata.sh

@@ -311,6 +311,16 @@ _EOF
 		echo "</array>" >> $TMPFPROPS
 	fi
 
+	# Replace package(s).
+	if [ -n "$replaces" ]; then
+		echo "<key>replaces</key>" >> $TMPFPROPS
+		echo "<array>" >> $TMPFPROPS
+		for f in ${replaces}; do
+			echo "<string>$f</string>" >> $TMPFPROPS
+		done
+		echo "</array>" >> $TMPFPROPS
+	fi
+
 	# Terminate the property list file.
 	echo "</dict>" >> $TMPFPROPS
 	echo "</plist>" >> $TMPFPROPS

shutils/tmpl_funcs.sh

@@ -76,7 +76,7 @@ reset_tmpl_vars()
 			only_for_archs conf_files keep_libtool_archives \
 			noarch subpackages sourcepkg gtk_iconcache_dirs \
 			abi_depends api_depends triggers openrc_services \
-			XBPS_EXTRACT_DONE XBPS_CONFIGURE_DONE \
+			replaces XBPS_EXTRACT_DONE XBPS_CONFIGURE_DONE \
 			XBPS_BUILD_DONE XBPS_INSTALL_DONE FILESDIR DESTDIR \
 			SRCPKGDESTDIR PATCHESDIR"