Backport PR #4137: Restore autorestore option for storemagic

It is now StoreMagics.autorestore rather than StoreMagic.autorestore (note the extra s).

Closes  #4078

IPython/extensions/storemagic.py

@@ -25,10 +25,12 b' To automatically restore stored variables at startup, add this to your'
 import inspect, os, sys, textwrap
 
 # Our own
+from IPython.config.configurable import Configurable
 from IPython.core.error import UsageError
 from IPython.core.fakemodule import FakeModule
 from IPython.core.magic import Magics, magics_class, line_magic
 from IPython.testing.skipdoctest import skip_doctest
+from IPython.utils.traitlets import Bool
 
 #-----------------------------------------------------------------------------
 # Functions and classes
@@ -68,11 +70,24 b' def restore_data(ip):'
 
 
 @magics_class
-class StoreMagics(Magics):
+class StoreMagics(Magics, Configurable):
     """Lightweight persistence for python variables.
 
     Provides the %store magic."""
 
+    autorestore = Bool(False, config=True, help=
+        """If True, any %store-d variables will be automatically restored
+        when IPython starts.
+        """
+    )
+
+    def __init__(self, shell):
+        Configurable.__init__(self, config=shell.config)
+        Magics.__init__(self, shell=shell)
+        self.shell.configurables.append(self)
+        if self.autorestore:
+            restore_data(self.shell)
+
     @skip_doctest
     @line_magic
     def store(self, parameter_s=''):

IPython/extensions/tests/test_storemagic.py

@@ -1,5 +1,6 b''
 import tempfile, os
 
+from IPython.config.loader import Config
 import nose.tools as nt
 
 ip = get_ipython()
@@ -30,3 +31,20 b' def test_store_restore():'
     nt.assert_in(os.path.realpath(tmpd), ip.user_ns['_dh'])
     
     os.rmdir(tmpd)
+
+def test_autorestore():
+    ip.user_ns['foo'] = 95
+    ip.magic('store foo')
+    del ip.user_ns['foo']
+    c = Config()
+    c.StoreMagics.autorestore = False
+    orig_config = ip.config
+    try:
+        ip.config = c
+        ip.extension_manager.reload_extension('storemagic')
+        nt.assert_not_in('foo', ip.user_ns)
+        c.StoreMagics.autorestore = True
+        ip.extension_manager.reload_extension('storemagic')
+        nt.assert_equal(ip.user_ns['foo'], 95)
+    finally:
+        ip.config = orig_config

IPython/terminal/ipapp.py

@@ -47,6 +47,7 b' from IPython.core.magics import ScriptMagics'
 from IPython.core.shellapp import (
     InteractiveShellApp, shell_flags, shell_aliases
 )
+from IPython.extensions.storemagic import StoreMagics
 from IPython.terminal.interactiveshell import TerminalInteractiveShell
 from IPython.utils import warn
 from IPython.utils.path import get_ipython_dir, check_for_old_config
@@ -219,6 +220,7 b' class TerminalIPythonApp(BaseIPythonApplication, InteractiveShellApp):'
             PlainTextFormatter,
             IPCompleter,
             ScriptMagics,
+            StoreMagics,
         ]
 
     subcommands = Dict(dict(