From acbb0ba1957fed082cbf9a589659b236dc6e4f46 2017-05-11 19:17:40
From: Sang Min Park <sangmin.park@twosigma.com>
Date: 2017-05-11 19:17:40
Subject: [PATCH] Sort and unique %config results

---

diff --git a/IPython/core/magics/config.py b/IPython/core/magics/config.py
index 230a2c6..044614b 100644
--- a/IPython/core/magics/config.py
+++ b/IPython/core/magics/config.py
@@ -108,8 +108,9 @@ class ConfigMagics(Magics):
         # some IPython objects are Configurable, but do not yet have
         # any configurable traits.  Exclude them from the effects of
         # this magic, as their presence is just noise:
-        configurables = [ c for c in self.shell.configurables
-                          if c.__class__.class_traits(config=True) ]
+        configurables = sorted(set([ c for c in self.shell.configurables
+                                     if c.__class__.class_traits(config=True)
+                                     ]), key=lambda x: x.__class__.__name__)
         classnames = [ c.__class__.__name__ for c in configurables ]
 
         line = s.strip()
diff --git a/IPython/core/tests/test_magic.py b/IPython/core/tests/test_magic.py
index dd26ba9..0ab5bb7 100644
--- a/IPython/core/tests/test_magic.py
+++ b/IPython/core/tests/test_magic.py
@@ -80,6 +80,24 @@ def test_config():
     ## should not raise.
     _ip.magic('config')
 
+def test_config_available_configs():
+    """ test that config magic prints available configs in unique and
+    sorted order. """
+    with capture_output() as captured:
+        _ip.magic('config')
+
+    stdout = captured.stdout
+    config_classes = stdout.strip().split('\n')[1:]
+    nt.assert_list_equal(config_classes, sorted(set(config_classes)))
+
+def test_config_print_class():
+    """ test that config with a classname prints the class's options. """
+    with capture_output() as captured:
+        _ip.magic('config TerminalInteractiveShell')
+
+    stdout = captured.stdout
+    nt.assert_in("TerminalInteractiveShell options", stdout)
+
 def test_rehashx():
     # clear up everything
     _ip.alias_manager.clear_aliases()