Add modes=[]/not_modes=[] to cmdutils.register

TODO

@@ -79,8 +79,6 @@ catch import errors for PyQt and QtWebKit
 Allow binding to empty values for keys to override defaults
 How do we handle empty values in input bar?
 Human-readable error messages for unknown settings / wrong interpolations / ...
-- Add mode=[]/no_mode=[] to cmdutils.register so we can avoid executing
-  commands in the wrong mode
 - Add more element-selection-detection code (with options?) based on:
       -> javascript: http://stackoverflow.com/a/2848120/2085149
       -> microFocusChanged and check active element via:

qutebrowser/commands/command.py

@@ -19,7 +19,8 @@
 
 import logging
 
-from qutebrowser.commands.exceptions import ArgumentCountError
+from qutebrowser.commands.exceptions import (ArgumentCountError,
+    InvalidModeError)
 
 from PyQt5.QtCore import pyqtSignal, QObject
 
@@ -55,7 +56,7 @@ class Command(QObject):
     signal = pyqtSignal(tuple)
 
     def __init__(self, name, maxsplit, hide, nargs, count, desc, instance,
-                 handler, completion):
+                 handler, completion, modes, not_modes):
         super().__init__()
         self.name = name
         self.maxsplit = maxsplit
@@ -66,18 +67,27 @@ class Command(QObject):
         self.instance = instance
         self.handler = handler
         self.completion = completion
+        self.modes = modes
+        self.not_modes = not_modes
 
     def check(self, args):
-        """Check if the argument count is valid.
-
-        Raise ArgumentCountError if not.
+        """Check if the argument count is valid and the command is permitted.
 
         Args:
             args: The supplied arguments
 
         Raise:
             ArgumentCountError if the argument count is wrong.
+            InvalidModeError if the command can't be called in this mode.
         """
+        import qutebrowser.keyinput.modes as modeman
+        if self.modes is not None and modeman.manager.mode not in self.modes:
+            raise InvalidModeError("This command is only allowed in {} "
+                                   "mode.".format('/'.join(self.modes)))
+        elif (self.not_modes is not None and
+              modeman.manager.mode in self.not_modes):
+            raise InvalidModeError("This command is not allowed in {} "
+                                   "mode.".format('/'.join(self.not_modes)))
         if self.nargs[1] is None and self.nargs[0] <= len(args):
             pass
         elif self.nargs[0] <= len(args) <= self.nargs[1]:

qutebrowser/commands/exceptions.py

@@ -33,3 +33,10 @@ class ArgumentCountError(TypeError):
     """Raised when a command was called with an invalid count of arguments."""
 
     pass
+
+
+class InvalidModeError(Exception):
+
+    """Raised when a command is called in a wrong input mode."""
+
+    pass

qutebrowser/commands/parsers.py

@@ -24,7 +24,7 @@ import qutebrowser.config.config as config
 import qutebrowser.commands.utils as cmdutils
 import qutebrowser.utils.message as message
 from qutebrowser.commands.exceptions import (ArgumentCountError,
-                                             NoSuchCommandError)
+    NoSuchCommandError, InvalidModeError)
 
 
 def split_cmdline(text):
@@ -202,6 +202,7 @@ class CommandParser:
             NoSuchCommandError: if a command wasn't found.
             ArgumentCountError: if a command was called with the wrong count of
                                 arguments.
+            InvalidModeError: if a command can't be called in this mode.
 
         Return:
             True if command was called (handler returnstatus is ignored!).
@@ -228,5 +229,11 @@ class CommandParser:
                 return False
             else:
                 raise
+        except InvalidModeError as e:
+            if ignore_exc:
+                message.error("{}: {}".format(self._cmd.name, e))
+                return False
+            else:
+                raise
         self._run(count=count)
         return True

qutebrowser/commands/utils.py

@@ -47,10 +47,11 @@ class register:  # pylint: disable=invalid-name
         hide: Whether to hide the command or not.
         completion: Which completion to use for arguments, as a list of
                     strings.
+        modes/not_modes: List of modes to use/not use.
     """
 
     def __init__(self, instance=None, name=None, nargs=None, maxsplit=-1,
-                 hide=False, completion=None):
+                 hide=False, completion=None, modes=None, not_modes=None):
         """Save decorator arguments.
 
         Gets called on parse-time with the decorator arguments.
@@ -58,12 +59,16 @@ class register:  # pylint: disable=invalid-name
         Args:
             See class attributes.
         """
+        if modes is not None and not_modes is not None:
+            raise ValueError("Only modes or not_modes can be given!")
         self.name = name
         self.maxsplit = maxsplit
         self.hide = hide
         self.nargs = nargs
         self.instance = instance
         self.completion = completion
+        self.modes = modes
+        self.not_modes = not_modes
 
     def __call__(self, func):
         """Register the command before running the function.
@@ -95,7 +100,8 @@ class register:  # pylint: disable=invalid-name
         cmd = Command(name=mainname, maxsplit=self.maxsplit,
                       hide=self.hide, nargs=nargs, count=count, desc=desc,
                       instance=self.instance, handler=func,
-                      completion=self.completion)
+                      completion=self.completion, modes=self.modes,
+                      not_modes=self.not_modes)
         for name in names:
             cmd_dict[name] = cmd
         return func

qutebrowser/keyinput/modes.py

@@ -158,7 +158,8 @@ class ModeManager(QObject):
         logging.debug("New mode stack: {}".format(self._mode_stack))
         self.left.emit(mode)
 
-    @cmdutils.register(instance='modeman', name='leave_mode', hide=True)
+    @cmdutils.register(instance='modeman', name='leave_mode',
+                       not_modes=['normal'], hide=True)
     def leave_current_mode(self):
         if self.mode == "normal":
             raise ValueError("Can't leave normal mode!")

qutebrowser/widgets/completion.py

@@ -297,12 +297,14 @@ class CompletionView(QTreeView):
             selmod.clearSelection()
             selmod.clearCurrentIndex()
 
-    @cmdutils.register(instance='mainwindow.completion', hide=True)
+    @cmdutils.register(instance='mainwindow.completion', hide=True,
+                       modes=['command'])
     def completion_item_prev(self):
         """Select the previous completion item."""
         self._next_prev_item(prev=True)
 
-    @cmdutils.register(instance='mainwindow.completion', hide=True)
+    @cmdutils.register(instance='mainwindow.completion', hide=True,
+                       modes=['command'])
     def completion_item_next(self):
         """Select the next completion item."""
         self._next_prev_item(prev=False)

qutebrowser/widgets/statusbar.py

@@ -290,7 +290,8 @@ class _Command(QLineEdit):
         self.setFocus()
         self.show_cmd.emit()
 
-    @cmdutils.register(instance='mainwindow.status.cmd', hide=True)
+    @cmdutils.register(instance='mainwindow.status.cmd', hide=True,
+                       modes=['command'])
     def command_history_prev(self):
         """Handle Up presses (go back in history)."""
         try:
@@ -303,7 +304,8 @@ class _Command(QLineEdit):
         if item:
             self.set_cmd_text(item)
 
-    @cmdutils.register(instance='mainwindow.status.cmd', hide=True)
+    @cmdutils.register(instance='mainwindow.status.cmd', hide=True,
+                       modes=['command'])
     def command_history_next(self):
         """Handle Down presses (go forward in history)."""
         if not self.history.browsing:
@@ -315,7 +317,8 @@ class _Command(QLineEdit):
         if item:
             self.set_cmd_text(item)
 
-    @cmdutils.register(instance='mainwindow.status.cmd', hide=True)
+    @cmdutils.register(instance='mainwindow.status.cmd', hide=True,
+                       modes=['command'])
     def command_accept(self):
         """Handle the command in the status bar.