[Bug python/27141] [RFE] Getting a python-call result is overly complicated

["hi-angel at yandex dot ru" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27141

--- Comment #1 from Hi-Angel <hi-angel at yandex dot ru> ---
UPD: turns out, current situation is worse. Even if we only consider
workarounds such as using a convenience function, gdb does not allow returning
a value from them. To make it work one have to be really tricky, and instead
assign the value to a gdb variable, and then check value of that variable in
the command chain. Example:

    class is_in_bt (gdb.Command):
        """Check if a string is in backtrace"""

        def __init__ (_):
            super ().__init__ ("is_in_bt", gdb.COMMAND_STATUS)

        def invoke (_, args_raw, __):
            args = gdb.string_to_argv(args_raw)
            if len(args) != 1:
                raise Exception("Wrong parameters number. Usage: is_in_bt <cmd>
<pattern>")
            else:
                ret = args[0] in gdb.execute('bt', to_string=True)
                gdb.execute(f'set var $retval = {int(ret)}') # gdb doesn't know
what is true or True, so gotta convert it to an int

    is_in_bt() # required to get it registered

And then inside gdb:

    if $retval
     >p 1
     >end
    $9 = 1

So, yeah, I feel like a number of people might not even figure out there's a
way to do that with convenience functions.

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