2 files changed, 66 insertions, 15 deletions

diff --git a/doc/docsrc_common/pardoc-distro.xml b/doc/docsrc_common/pardoc-distro.xml
index 317a2a5..00711b5 100644
--- a/doc/docsrc_common/pardoc-distro.xml
+++ b/doc/docsrc_common/pardoc-distro.xml
@@ -34,4 +34,7 @@
 <para id="Yocto_VER"><phrase>&DISTRO;</phrase></para>
 <para id="Yocto_NAME"><phrase>&DISTRO_NAME_NO_CAP;</phrase></para>
 <para id="ULINK_YOCTO_RELEASE_NOTES"><ulink url='&YOCTO_RELEASE_NOTES;'>&YOCTO_RELEASE_NOTES;</ulink></para>
+<para id="prev_baseline"><phrase>el5_baseline</phrase></para>
+<para id="prev_lic_file"><phrase>doc/book-enea-linux-open-source/doc/licenses.xml</phrase></para>
+<para id="new_lic_file"><phrase>doc/book-enea-linux-open-source/doc/licenses.xml</phrase></para>
 </section>
diff --git a/doc/gen_pkgdiff.py b/doc/gen_pkgdiff.py
index 7dd8c73..5a13311 100644
--- a/doc/gen_pkgdiff.py
+++ b/doc/gen_pkgdiff.py
@@ -1,14 +1,30 @@
 ###############################################################################
 #
-# Diff two licenses.xml files. Splits the result in three sets:
+# Diff two licenses.xml files. There are two cases:
+# * Two arguments
+#    In this case, the two arguments are the two files to compare
+#
+# * No arguments
+#     In this casem the license files are specified by the following
+#     parameters in pardoc-distro.xml:
+#     - prev_baseline
+#     - prev_lic_file
+#     - new_lic_file
+#
+# The result is presented as three sets:
 # 1) Removed
-#   Packages present in the old file, but not in the new.
+#   Packages present in the previous file, but not in the new.
 #
 # 2) Added
-#   Packages present in the new file, but not in the old.
+#   Packages present in the new file, but not in the previous.
 #
 # 3) Changed
-#   Packages present in both files, but with different versions.
+#   Packages present in both files, but with different versions. If more than
+#   one version of a package is included, then all difference in the version
+#   set causes the package to be listed as changed.
+#   E.g.
+#    (v1) -> (v2)
+#    (v1, v2) -> (v2, v3)
 #
 # Note that packages with the unchanged version is not listed.
 #
@@ -17,13 +33,30 @@
 #
 ###############################################################################
 
+import os
 import sys
-import subprocess
+import subprocess as sp
 import xml.etree.ElementTree as ET
+import re
+
+repo_root   = sp.check_output(["git", "rev-parse", "--show-toplevel"]).rstrip()
+script_root = os.path.dirname(os.path.realpath(__file__))
+param_file  = os.path.join(script_root, "docsrc_common/pardoc-distro.xml")
+
+def get_param(param_name):
+    pat = re.compile("%s.*>([^<>]+)</" % param_name)
+
+    with open(param_file) as f:
+        for line in f:
+            m = pat.search(line)
+            if m:
+                return m.group(1)
+
+    return None
 
 def get_pkgs(file_spec):
     if file_spec.find(":") >= 0:
-        s = subprocess.check_output(("git", "show", file_spec))
+        s = sp.check_output(("git", "show", file_spec))
     else:
         f = open(file_spec)
         s = f.read()
@@ -65,22 +98,37 @@ def get_pkgs(file_spec):
 
 #----------------------------------------
 
-if len(sys.argv) != 3:
+
+if len(sys.argv) == 3:
+    new_file, prev_file = sys.argv[1:3]
+
+elif len(sys.argv) == 1:
+    prev_baseline = get_param("prev_baseline")
+    prev_lic_file = get_param("prev_lic_file")
+    new_lic_file  = get_param("new_lic_file")
+
+    new_file = os.path.relpath(os.path.join(repo_root, new_lic_file))
+    prev_file = "%s:%s" % (prev_baseline, prev_lic_file)
+    print prev_file
+    print new_file
+
+else:
     sys.stderr.write("Usage:\n")
-    sys.stderr.write("  %s " % sys.argv[0])
+    sys.stderr.write("  1) %s\n" % sys.argv[0])
+    sys.stderr.write("  2) %s " % sys.argv[0])
     sys.stderr.write("<new license file> <old license file>\n")
     sys.stderr.write("\n")
-    sys.stderr.write("  E.g.:\n")
-    sys.stderr.write("    %s " % sys.argv[0])
-    sys.stderr.write("licenses-5.0-ppc.xml licenses.xml\n")
+    sys.stderr.write("In case 1, the files are specified using the following\n")
+    sys.stderr.write("parameters in pardoc-distro.xml:\n")
+    sys.stderr.write("  - prev_baseline\n")
+    sys.stderr.write("  - prev_lic_file\n")
+    sys.stderr.write("  - new_lic_file\n")
     exit()
 
-new_file, old_file = sys.argv[1:3]
-
 sys.stderr.write("New license file  : %s\n" % new_file)
-sys.stderr.write("Prev license file : %s\n" % old_file)
+sys.stderr.write("Prev license file : %s\n" % prev_file)
 
-old_pset, old_pdict = get_pkgs(old_file)
+old_pset, old_pdict = get_pkgs(prev_file)
 new_pset, new_pdict = get_pkgs(new_file)
 
 added   = new_pset - old_pset # Set subtraction