I think I have found the solution. I don't think it is possible to solve
the problem just using decorators. The command_method decorator needs some
help.
Here is a decorator:
def command_method(name):
"""A decorator that creates a Leo command from a method."""
def _wrapper(f):
"""This wrapper is always called with one argument: the wrapped
function."""
clsname = f.__qualname__.partition('.')[0]
@functools.wraps(f)
def inner_wrapper(self, event=None):
"""Inner wrapper docstring."""
getinst = globals().get(f'{clsname}_in_c')
c = self.c
instance = getinst(c)
return f(instance, event)
global_commands_dict[name] = inner_wrapper
return inner_wrapper
return _wrapper
It relies on g having a function 'Undoer_in_c' for the commands in leoUndo.
For every class that uses this decorator, after the class definition it is
necesssary to add the following line:
g.Undoer_in_c = lambda c:c.undoer
Other classes should add similar functions with their own names.
The inner_wrapper uses this function to get the instance for executing
command.
I have pushed this code in commands2 branch and all unittests pass.
HTH Vitalije
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