[Bug python/15637] New: override a command from Python

[Bug python/15637] New: override a command from Python

[tromey at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15637

            Bug ID: 15637
           Summary: override a command from Python
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at redhat dot com

Right now if you write a command in Python that has the same name as
an existing command, there is no way to access the previous
command.  It would be handy if this were possible.

I have a partial patch for this; I'll upload or push it a
bit later.  Now your command's invoke method can use the super
'invoke' to access the previous command.

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[Bug python/15637] override a command from Python

[tromey at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=15637

--- Comment #1 from Tom Tromey <tromey at redhat dot com> ---
This is on the branch "python/changes-for-gui" in my
gitorious repository: https://gitorious.org/binutils-gdb

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[Bug python/15637] override a command from Python

[tromey at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=15637

--- Comment #2 from Tom Tromey <tromey at redhat dot com> ---
It occurred to me that a single change could fix both
this and bug #13077.

If we had an API to get an existing gdb command as a
Command object, then we could simply invoke methods on it.
Redefining the CLI command would still work fine, since
the new command could simply keep a reference to the old
command.

For this to work nicely I think we'd want to have the
API return both a command and the unparsed part of a command
line (for completion).  So:

(command, remainder) = gdb.command('p x * y')

would yield the <print> command and the string "x * y".

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