[Bug python/12175] show_doc for gdb.Parameter has strange behaviour

["pedro at codesourcery dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12175

Pedro Alves <pedro at codesourcery dot com> changed:

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--- Comment #3 from Pedro Alves <pedro at codesourcery dot com> 2010-11-16 14:49:03 UTC ---
(In reply to comment #2)
On Tuesday 16 November 2010 14:32:01, pmuldoon at redhat dot com wrote:
> When you "show" a parameter, the show_doc documentation is used and then the
> value appended at the end (in this case, "off").  GDB trims off the first five
> letters of the show documentations (the "Show") so it can reuse it for both the
> help text and the value assignment text.  Ditto for the Set.

FYI, that's deprecated behavior that is going away at some point.
All commands should implement the necessary show-current-state callback so
that that fallback does not need to apply.  The reason that is broken is
that it only works for English...  At some point, I'd like to make a pass
through all commands in GDB, implement all the missing callbacks,
get rid of that fallback code, and put an assertion on place
making sure the command implements a show callback.

> So the example above "works".
> 
> 
> The "command is not documented" is printed if either show_doc, set_doc or doc
> is not set in the parameter.
> 
> Maybe we need a better explanation in the manual?

I've no clue on the Python API, is there a way to implement the
"show" callback of a parameter?  If not, there should be.  If
yes, it should be a requirement to implement it, per the
rationale I mention above.

-- 
Pedro Alves

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