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

src/utils.py

@@ -165,7 +165,7 @@ def timeElapsed(elapsed, leadingZeroes=False, years=True, weeks=True,
         return ret[0]
     else:
         return ' and '.join([', '.join(ret[:-1]), ret[-1]])
-        
+
 def distance(s, t):
     """Returns the levenshtein edit distance between two strings."""
     n = len(s)
@@ -230,7 +230,7 @@ def perlReToPythonRe(s):
     except AttributeError:
         raise ValueError, 'Invalid flag: %s' % c
     return re.compile(regexp, flag)
-    
+
 def perlReToReplacer(s):
     """Converts a string representation of a Perl regular expression (i.e.,
     s/foo/bar/g or s/foo/bar/i) to a Python function doing the equivalent
@@ -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

@@ -104,7 +104,7 @@ class UtilsTest(unittest.TestCase):
             r = utils.dqrepr(s)
             self.assertEqual(s, eval(r), s)
             self.failUnless(r[0] == '"' and r[-1] == '"', s)
- 
+
     def testPerlReToPythonRe(self):
         r = utils.perlReToPythonRe('m/foo/')
         self.failUnless(r.search('foo'))
@@ -126,10 +126,19 @@ class UtilsTest(unittest.TestCase):
         self.assertEqual(f('foobarbaz'), 'foorz')
         f = utils.perlReToReplacer('s/ba\\///g')
         self.assertEqual(f('fooba/rba/z'), 'foorz')
-		
+
     def testFindBinaryInPath(self):
-        self.assertEqual(None, utils.findBinaryInPath('asdfhjklasdfhjkl'))
-        self.assertEqual('/bin/sh', utils.findBinaryInPath('sh'))
+        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: