Added function commaAndify to turn a list of strings into a proper English foo, bar, and baz string.

src/utils.py

@@ -259,4 +259,15 @@ def findBinaryInPath(s):
             break
     return cmdLine
 
+def commaAndify(L):
+    if len(L) == 0:
+        return ''
+    elif len(L) == 1:
+        return L[0]
+    elif len(L) == 2:
+        return '%s and %s' % (L[0], L[1])
+    else:
+        L[-1] = 'and %s' % L[-1]
+        return ', '.join(L)
+
 # vim:set shiftwidth=4 tabstop=8 expandtab textwidth=78:

test/test_utils.py

@@ -128,8 +128,17 @@ class UtilsTest(unittest.TestCase):
         self.assertEqual(f('fooba/rba/z'), 'foorz')
 
     def testFindBinaryInPath(self):
+        if os.name == 'posix':
             self.assertEqual(None, utils.findBinaryInPath('asdfhjklasdfhjkl'))
             self.assertEqual('/bin/sh', utils.findBinaryInPath('sh'))
 
+    def testCommaAndify(self):
+        L = ['foo']
+        self.assertEqual(utils.commaAndify(L), 'foo')
+        L.append('bar')
+        self.assertEqual(utils.commaAndify(L), 'foo and bar')
+        L.append('baz')
+        self.assertEqual(utils.commaAndify(L), 'foo, bar, and baz')
+
 # vim:set shiftwidth=4 tabstop=8 expandtab textwidth=78: