make letter_dir_for aware of '*' wildcard name

Author: boegel

easybuild/framework/easyconfig/easyconfig.py

@@ -1291,9 +1291,14 @@ def letter_dir_for(name):
     This usually just the 1st letter of the software name (in lowercase),
     except for funky software names, e.g. ones starting with a digit.
     """
-    letter = name.lower()[0]
-    if letter < 'a' or letter > 'z':
-        letter = '0'
+    # wildcard name should result in wildcard letter
+    if name == '*':
+        letter = '*'
+    else:
+        letter = name.lower()[0]
+        # outside of a-z range, use '0'
+        if letter < 'a' or letter > 'z':
+            letter = '0'
 
     return letter
 

test/framework/easyconfig.py

@@ -997,6 +997,7 @@ def test_letter_dir(self):
             '3to2': '0',
             '7zip': '0',
             '_bleh_': '0',
+            '*': '*',
         }
         for name, letter in test_cases.items():
             self.assertEqual(letter_dir_for(name), letter)