add decrement_release function and test for it

share/eterbuild/functions/spec

@@ -120,6 +120,13 @@ set_version()
 	fi
 }
 
+# decrement release with workaround about non textual release
+decrement_release()
+{
+	local NUMPART=$(echo $1 | sed -e "s|[^0-9].*||g")
+	[ -n "$NUMPART" ] || NUMPART=1
+	echo $(($NUMPART - 1))
+}
 
 subst_namever()
 {

tests/decrement_release.sh

+#!/bin/sh
+
+. `dirname $0`/../share/eterbuild/functions/common
+load_mod spec
+
+check()
+{
+	[ "$2" != "$3" ] && echo "FATAL with '$1': result '$2' do not match with '$3'" || echo "OK for '$1' with '$2'"
+}
+
+check_dec()
+{
+	check $1 `decrement_release $1` $2
+}
+
+check_dec 39 38
+check_dec 39.1 38
+check_dec 39cvs 38
+check_dec 39.1cvs 38
+check_dec cvs 0