Do not report A. as a proper noun in copyrights

A single uppercase letter followed by a dot is a not proper noun.
This is a source of false positive detection otherwise.

Signed-off-by: Philippe Ombredanne <[email protected]>

Author: pombredanne

src/cluecode/copyrights.py

@@ -600,6 +600,9 @@ def from_node(
     # parens such as (1) or (a) is a sign of junk but of course NOT (c)
     (r'^\(([abdefghi\d]|ii|iii)\)$', 'JUNK'),
 
+    # Single uppercase letters followed by a period
+    (r'^[A-Z]\.$', 'JUNK'),
+
     # found in crypto certificates and LDAP
     (r'^O=$', 'JUNK'),
     (r'^OU=?$', 'JUNK'),

tests/cluecode/data/copyrights/copyright-discussion-false-positive.txt

@@ -0,0 +1,37 @@
+# order to be recognized.  For example, each of these is fine:
+#
+#   Copyright @copyright{} 1990-2005, 2007-2009 Free Software
+#   Foundation, Inc.
+#
+#   # Copyright (C) 1990-2005, 2007-2009 Free Software
+#   # Foundation, Inc.
+#
+#   /*
+#    * Copyright © 90,2005,2007-2009
+#    * Free Software Foundation, Inc.
+#    */
+#
+# However, the following format is not recognized because the line
+# prefix changes after the first line:
+#
+#   ## Copyright (C) 1990-2005, 2007-2009 Free Software
+#   #  Foundation, Inc.
+#
+# However, any correctly formatted copyright statement following
+# a non-matching copyright statements would be recognized.
+#
+#   2. Its format is "Copyright (C)", then a list of copyright years,
+#      and then the name of the copyright holder.
+#   3. The "(C)" takes one of the following forms or is omitted
+#      entirely:
+#
+#        A. (C)
+#        B. (c)
+#        C. @copyright{}
+#        D. ©
+#        E. ©
+#
+#   4. The "Copyright" appears at the beginning of a line, except that it
+#      may be prefixed by any sequence (e.g., a comment) of no more than
+#      5 characters -- including white space.
+

tests/cluecode/data/copyrights/copyright-discussion-false-positive.txt.yml

@@ -0,0 +1,7 @@
+what:
+  - copyrights
+copyrights:
+  - Copyright 1990-2005, 2007-2009 Free Software Foundation, Inc.
+  - Copyright (c) 1990-2005, 2007-2009 Free Software Foundation, Inc.
+  - Copyright (c) 90,2005,2007-2009 Free Software Foundation, Inc.
+  - Copyright (c) 1990-2005, 2007-2009 Free Software Foundation, Inc.