From 393b2393a5a5effcc325cfeb92e5222c99f750f2 Mon Sep 17 00:00:00 2001
From: Mike Naberezny <mike@naberezny.com>
Date: Fri, 3 Feb 2012 20:25:55 -0800
Subject: [PATCH] Show help when cd is not given an argument

---
 src/py65/monitor.py            | 3 +++
 src/py65/tests/test_monitor.py | 8 ++++++++
 2 files changed, 11 insertions(+)

diff --git a/src/py65/monitor.py b/src/py65/monitor.py
index 1c4b9ed..fa6bc92 100644
--- a/src/py65/monitor.py
+++ b/src/py65/monitor.py
@@ -457,6 +457,9 @@ class Monitor(cmd.Cmd):
         self._output("Change the working directory.")
 
     def do_cd(self, args):
+        if args == '':
+            return self.help_cd()
+
         try:
             os.chdir(args)
         except OSError, why:
diff --git a/src/py65/tests/test_monitor.py b/src/py65/tests/test_monitor.py
index 961afa8..0591e8d 100644
--- a/src/py65/tests/test_monitor.py
+++ b/src/py65/tests/test_monitor.py
@@ -149,6 +149,14 @@ class MonitorTests(unittest.TestCase):
         out = stdout.getvalue()
         self.assertTrue(out.startswith("cd <directory>"))
 
+    def test_do_cd_with_no_dir_shows_help(self):
+        stdout = StringIO()
+        mon = Monitor(stdout=stdout)
+        mon.do_cd("")
+
+        out = stdout.getvalue()
+        self.assertTrue(out.startswith("cd <directory>"))
+
     # delete_label
 
     def test_shortcut_for_delete_label(self):