Add setupDir for making grace dir

grace/tac.py

@@ -17,3 +17,16 @@ def getTac(pipedef=None):
     if pipedef:
         template += '\nplumber.addPipe(%r, %r)\n' % pipedef
     return template
+
+
+
+def setupDir(dirname, pipedef):
+    """
+    Create a grace directory.
+    
+    @param dirname: XXX
+    @param pipedef: XXX
+    """
+    fp = FilePath(dirname)
+    fp.makedirs()
+    fp.child('grace.tac').setContent(getTac(pipedef))

grace/test/test_tac.py

@@ -4,7 +4,7 @@
 grace_root = FilePath(__file__).parent().parent()
 tac_template = grace_root.child('grace.tac')
 
-from grace.tac import getTac
+from grace.tac import getTac, setupDir
 
 
 class getTacTest(TestCase):
@@ -25,4 +25,22 @@ def test_onepipe(self):
         s = getTac(('src', 'dst'))
         expected = tac_template.getContent()
         expected += "\nplumber.addPipe('src', 'dst')\n"
-        self.assertEqual(s, expected)
+        self.assertEqual(s, expected)
+
+
+
+class setupDirTest(TestCase):
+
+
+    def test_dne(self):
+        """
+        If the directory does not exist, it will create the directory and
+        put a tac file in it.
+        """
+        tmp = FilePath(self.mktemp())
+        setupDir(tmp.path, ('foo', 'bar'))
+        self.assertTrue(tmp.exists(), "Should make the directory")
+        tac = tmp.child('grace.tac')
+        self.assertTrue(tac.exists(), "Should make the tac file")
+        self.assertEqual(tac.getContent(), getTac(('foo', 'bar')),
+                         "Should copy the tac template in")