specfile: Replace "current" string in release/version values

With this feature, it is not necessary to hardcode versions/releases
used in inter-dependencies.

    <RuntimeDependencies>
        <Dependency release="current">xorg-server-common</Dependency>
    </RuntimeDependencies>

The "current" value will be replaced by the release of the source
package that this spec file defines. This is done when building
the package so that binary packages and index files do not include
"current" string.

pisi/specfile.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2005 - 2007, TUBITAK/UEKAE
+# Copyright (C) 2005-2010, TUBITAK/UEKAE
 #
 # This program is free software; you can redistribute it and/or modify it under
 # the terms of the GNU General Public License as published by the Free
@@ -392,6 +392,24 @@ class SpecFile(xmlfile.XmlFile):
     t_Components = [ [component.Component], autoxml.optional, "Component"]
     t_Groups = [ [group.Group], autoxml.optional, "Group"]
 
+    def decode_hook(self, node, errs, where):
+        current_version = self.history[0].version
+        current_release = self.history[0].release
+
+        for package in self.packages:
+            deps = package.packageDependencies + package.packageAnyDependencies
+            for dep in deps:
+                for attr_name, attr_value in dep.__dict__.items():
+                    if attr_value != "current":
+                        continue
+
+                    if attr_name.startswith("version"):
+                        dep.__dict__[attr_name] = current_version
+
+                    elif attr_name.startswith("release"):
+                        dep.__dict__[attr_name] = current_release
+
+
     def getSourceVersion(self):
         return self.history[0].version