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Re: Python API: can I make new prefix Parameters?
- From: Evan Driscoll <evaned at gmail dot com>
- To: Armando Miraglia <arma2ff0 at gmail dot com>
- Cc: gdb at sourceware dot org
- Date: Thu, 23 Jul 2015 11:09:24 -0500
- Subject: Re: Python API: can I make new prefix Parameters?
- Authentication-results: sourceware.org; auth=none
- References: <CAAR9PsX2CMoAF7PThZd3R-FSsUtu-UQMQ1Rr-1yfasb7w==JnQ at mail dot gmail dot com> <CAOcbMd3sqfrJogM4jd3=vtvYbZM-QkWCJ8W5inUuJ15ow9sOJQ at mail dot gmail dot com> <CAAR9PsW9zcMcpB19S6qKajd9Wjot13bpsZ+_1ya13qweQDT36w at mail dot gmail dot com> <CAOcbMd3t1xcXjHEM9qQvHkYmHDox5Uj_7VMEO0t1cXjdOzWxKQ at mail dot gmail dot com>
On Thu, Jul 23, 2015 at 10:55 AM, Armando Miraglia <arma2ff0@gmail.com> wrote:
> To have your own type of "set history" you should do something
> like this:
>
> class MyHistory(gdb.Command):
> def __init__(self):
> super(MyHistory, self).__init__("set myhistory", COMMAND_DATA)
>
> def invoke(self, arg, from_tty):
> # use arg to extract the parameter name and check
> # if it maches your TestParameter name for example, and
> # act on it accordingly. In can also simply use your command
> # as a proxy using parse_and_eval or execute, hence eventually
> # executing "set testparam" instead of "set myhistory testparam"
> pass
>
> I hope this was helpful.
I appreciate your responses, but I feel we may be talking past each other. :-)
Let's see if I can describe this better. Forgetting about Python-level
Commands vs Parameters, what I want is, from the user's perspective,
for 'set my-category my-setting <arg>' and 'show my-category
my-setting' to work.
Now, I can achieve this in the following manner using gdb.Command:
1. Define a prefix command "set my-category"
2. Define a prefix command "show my-category"
3. Define a non-prefix command "set my-category my-setting"
4. Define a non-prefix command "show my-category my-setting"
But #3 especially is a bit annoying in comparison to using
gdb.Parameter, because I have to take care of a fair bit of stuff
myself. For example, with a Parameter I could use gdb.PARAM_ENUM and
that will automatically provide validation and completion for the set
of permissible values, but I'd have to do that myself if 'set
my-category my-setting <arg>' is a gdb.Command. I also have to define
twice as many Commands as I would if I could say "make a 'my-category'
prefix Parameter" then "make a 'my-category my-setting'" Parameter. So
I'm wondering if there's a better way to do it with gdb.Parameter.
Does that make it clearer what I'm trying to do?
Inspired by your previous email, I also tried the following hybrid approach:
import gdb
class SetPrefixCommand (gdb.Command):
"""Dummy"""
def __init__(self):
super(SetPrefixCommand, self).__init__(
"set my-category",
gdb.COMMAND_SUPPORT,
gdb.COMPLETE_NONE,
True)
SetPrefixCommand()
class ShowPrefixCommand (gdb.Command):
"""Dummy"""
def __init__(self):
super(ShowPrefixCommand, self).__init__(
"show my-category",
gdb.COMMAND_SUPPORT,
gdb.COMPLETE_NONE,
True)
ShowPrefixCommand()
class TestParameter(gdb.Parameter):
"""The Parameter"""
def __init__(self):
super(TestParameter, self).__init__(
"test-category test-param",
gdb.COMMAND_SUPPORT,
gdb.PARAM_ENUM,
["one", "two", "three"])
self.value = "one"
self.set_doc = "Test doc (set)"
self.show_doc = "Test doc (show)"
param = TestParameter()
but that still gives the same error:
(gdb) source ~/gdb/test_parameter.py
Traceback (most recent call last):
File "~/gdb/test_parameter.py", line 72, in <module>
File "~/gdb/test_parameter.py", line 67, in __init__
RuntimeError: Could not find command prefix test-category
Evan