Move bind completion to configmodels.

When in miscmodels, the config module was unable to find the function.
It appears to be some sort of circular import issue:

```
  File "/home/rcorre/projects/contrib/qutebrowser/qutebrowser/app.py", line 44, in <module>
    from qutebrowser.completion.models import miscmodels
  File "/home/rcorre/projects/contrib/qutebrowser/qutebrowser/completion/models/miscmodels.py", line 24, in <module>
    from qutebrowser.completion.models import completionmodel, listcategory, util
  File "/home/rcorre/projects/contrib/qutebrowser/qutebrowser/completion/models/util.py", line 24, in <module>
    from qutebrowser.config import config
  File "/home/rcorre/projects/contrib/qutebrowser/qutebrowser/config/config.py", line 223, in <module>
    class ConfigCommands:
  File "/home/rcorre/projects/contrib/qutebrowser/qutebrowser/config/config.py", line 314, in ConfigCommands
    @cmdutils.argument('command', completion=miscmodels.bind)
AttributeError: module 'qutebrowser.completion.models.miscmodels' has no attribute 'bind'
```

As configmodel imports util (and thereby config as well) it is unclear
to me why moving bind() to configmodel actually fixes this, but it does.

qutebrowser/completion/models/configmodel.py

@@ -58,3 +58,24 @@ def value(optname, *values):
     if vals is not None:
         model.add_category(listcategory.ListCategory("Completions", vals))
     return model
+
+
+def bind(key):
+    """A CompletionModel filled with all bindable commands and descriptions.
+
+    Args:
+        key: the key being bound.
+    """
+    model = completionmodel.CompletionModel(column_widths=(20, 60, 20))
+    cmd_text = config.key_instance.get_bindings_for('normal').get(key)
+
+    if cmd_text:
+        cmd_name = cmd_text.split(' ')[0]
+        cmd = cmdutils.cmd_dict.get(cmd_name)
+        data = [(cmd_text, cmd.desc, key)]
+        model.add_category(listcategory.ListCategory("Current", data))
+
+    cmdlist = util.get_cmd_completions(include_hidden=True,
+                                       include_aliases=True)
+    model.add_category(listcategory.ListCategory("Commands", cmdlist))
+    return model

qutebrowser/completion/models/miscmodels.py

@@ -19,16 +19,16 @@
 
 """Functions that return miscellaneous completion models."""
 
-from qutebrowser.config import config, configdata
+from qutebrowser.config import configdata
 from qutebrowser.utils import objreg, log
-from qutebrowser.completion.models import completionmodel, listcategory
-from qutebrowser.commands import cmdutils
+from qutebrowser.completion.models import completionmodel, listcategory, util
 
 
 def command():
     """A CompletionModel filled with non-hidden commands and descriptions."""
     model = completionmodel.CompletionModel(column_widths=(20, 60, 20))
-    cmdlist = _get_cmd_completions(include_aliases=True, include_hidden=False)
+    cmdlist = util.get_cmd_completions(include_aliases=True,
+                                       include_hidden=False)
     model.add_category(listcategory.ListCategory("Commands", cmdlist))
     return model
 
@@ -37,8 +37,8 @@ def helptopic():
     """A CompletionModel filled with help topics."""
     model = completionmodel.CompletionModel()
 
-    cmdlist = _get_cmd_completions(include_aliases=False, include_hidden=True,
-                                   prefix=':')
+    cmdlist = util.get_cmd_completions(include_aliases=False,
+                                       include_hidden=True, prefix=':')
     settings = ((opt.name, opt.description)
                 for opt in configdata.DATA.values())
 
@@ -122,51 +122,3 @@ def buffer():
         model.add_category(cat)
 
     return model
-
-
-def bind(key):
-    """A CompletionModel filled with all bindable commands and descriptions.
-
-    Args:
-        key: the key being bound.
-    """
-    model = completionmodel.CompletionModel(column_widths=(20, 60, 20))
-    cmd_text = config.key_instance.get_bindings_for('normal').get(key)
-
-    if cmd_text:
-        cmd_name = cmd_text.split(' ')[0]
-        cmd = cmdutils.cmd_dict.get(cmd_name)
-        data = [(cmd_text, cmd.desc, key)]
-        model.add_category(listcategory.ListCategory("Current", data))
-
-    cmdlist = _get_cmd_completions(include_hidden=True, include_aliases=True)
-    model.add_category(listcategory.ListCategory("Commands", cmdlist))
-    return model
-
-
-def _get_cmd_completions(include_hidden, include_aliases, prefix=''):
-    """Get a list of completions info for commands, sorted by name.
-
-    Args:
-        include_hidden: True to include commands annotated with hide=True.
-        include_aliases: True to include command aliases.
-        prefix: String to append to the command name.
-
-    Return: A list of tuples of form (name, description, bindings).
-    """
-    assert cmdutils.cmd_dict
-    cmdlist = []
-    cmd_to_keys = config.key_instance.get_reverse_bindings_for('normal')
-    for obj in set(cmdutils.cmd_dict.values()):
-        hide_debug = obj.debug and not objreg.get('args').debug
-        hide_hidden = obj.hide and not include_hidden
-        if not (hide_debug or hide_hidden or obj.deprecated):
-            bindings = ', '.join(cmd_to_keys.get(obj.name, []))
-            cmdlist.append((prefix + obj.name, obj.desc, bindings))
-
-    if include_aliases:
-        for name, cmd in config.val.aliases.items():
-            bindings = ', '.join(cmd_to_keys.get(name, []))
-            cmdlist.append((name, "Alias for '{}'".format(cmd), bindings))
-
-    return cmdlist

qutebrowser/completion/models/util.py

@@ -0,0 +1,52 @@
+# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
+
+# Copyright 2017 Ryan Roden-Corrent (rcorre) <ryan@rcorre.net>
+#
+# This file is part of qutebrowser.
+#
+# qutebrowser is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# qutebrowser is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with qutebrowser.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Utility functions for completion models."""
+
+from qutebrowser.utils import objreg
+from qutebrowser.commands import cmdutils
+from qutebrowser.config import config
+
+
+def get_cmd_completions(include_hidden, include_aliases, prefix=''):
+    """Get a list of completions info for commands, sorted by name.
+
+    Args:
+        include_hidden: True to include commands annotated with hide=True.
+        include_aliases: True to include command aliases.
+        prefix: String to append to the command name.
+
+    Return: A list of tuples of form (name, description, bindings).
+    """
+    assert cmdutils.cmd_dict
+    cmdlist = []
+    cmd_to_keys = config.key_instance.get_reverse_bindings_for('normal')
+    for obj in set(cmdutils.cmd_dict.values()):
+        hide_debug = obj.debug and not objreg.get('args').debug
+        hide_hidden = obj.hide and not include_hidden
+        if not (hide_debug or hide_hidden or obj.deprecated):
+            bindings = ', '.join(cmd_to_keys.get(obj.name, []))
+            cmdlist.append((prefix + obj.name, obj.desc, bindings))
+
+    if include_aliases:
+        for name, cmd in config.val.aliases.items():
+            bindings = ', '.join(cmd_to_keys.get(name, []))
+            cmdlist.append((name, "Alias for '{}'".format(cmd), bindings))
+
+    return cmdlist

qutebrowser/config/config.py

@@ -29,7 +29,7 @@ from qutebrowser.config import configdata, configexc, configtypes, configfiles
 from qutebrowser.utils import utils, objreg, message, log, usertypes
 from qutebrowser.misc import objects
 from qutebrowser.commands import cmdexc, cmdutils
-from qutebrowser.completion.models import configmodel, miscmodels
+from qutebrowser.completion.models import configmodel
 
 # An easy way to access the config from other code via config.val.foo
 val = None
@@ -311,7 +311,7 @@ class ConfigCommands:
 
     @cmdutils.register(instance='config-commands', maxsplit=1,
                        no_cmd_split=True, no_replace_variables=True)
-    @cmdutils.argument('command', completion=miscmodels.bind)
+    @cmdutils.argument('command', completion=configmodel.bind)
     def bind(self, key, command=None, *, mode='normal', force=False):
         """Bind a key to a command.
 

tests/unit/completion/test_models.py

@@ -546,7 +546,7 @@ def test_bind_completion(qtmodeltester, cmdutils_stub, config_stub,
         - the binding (if any) is shown in the misc column
         - aliases are included
     """
-    model = miscmodels.bind('ZQ')
+    model = configmodel.bind('ZQ')
     model.set_pattern('')
     qtmodeltester.data_display_may_return_none = True
     qtmodeltester.check(model)