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Re: [PATCH] improved bash completion v2

From: Julian Foad <julianfoad_at_btopenworld.com>
Date: 2005-11-17 17:03:35 CET

Fabien COELHO wrote:
>> (4)
>> $ svn pget prop file --revision 1 -
>> <TAB>
>> --config-dir --non-interactive --revision -R
>> --help --password --strict -h
>> --no-auth-cache --recursive --username -r
>> and it doesn't list "--revprop" which is required when "--revision" is
>> given.
> Double no on this one :
> --revprop is *not* required with --revision, you can ask for the value
> of simple property on a file at a given revision in the past.

Oops - my mistake. I wrote that with an example of "propset" (where
"--revprop" is required iff --revision is given) and then "simplified" the example.

> They are both mandatory for revision properties... but "prop" is not.
> You can have that by adding it to the "SVN_REV_PROP" env variable.
> The default is to assume that it is a file property so only --revision
> is allowed.
> Thus it is a feature, not a bug;-)

OK. (For "pset" and "pedit", then, it shouldn't suggest "--revision" when the
property name is not a revprop, but I don't think that's very important.)

>> (5)
>> $ svn cp a b --_
>> <TAB>
>> $ svn cp a b -- _
>> After both arguments have been given to a command like "cp", it no
>> longer recognises options, and instead silently inserts a space.
> Yes, idem this is a partially a *feature*, no options after the
> arguments are supplied seems a sensible rule to me. It should have not
> proposed '--'
> as a completion. I guess bash did it.

Well, it's inconsistent with how it behaves on other commands. Only the
two-argument commands suffer from this problem. For other commands, your code
offers the correct choice of options in this position.

   $ svn diff a b --_
   --config-dir --force --no-auth-cache [...]

>>> + # some way to tell 'no completion'... is there a better one?
>>> + COMPREPLY=( '' )
>> This tells Bash that the only completion for this argument is the
>> empty string. I think it is more correct, and better in practice, to
>> return an empty array; although Bash then uses filenames for
>> completion, it is more likely to result in a beep (depending on what
>> files are present) rather than a space. (As an enhancement, maybe
>> there is some way to tell Bash not to use file names for completion.)
> I disagree.
> I do want to stop the file completion, because this case is triggered
> when no more arguments are expected (e.g. you're doing a cp and you
> already gave 2 arguments, whatever you're adding is garbage and should
> trigger an error of the completion, but not a standard file completion).

That's fine if you can find a way to stop the completion, but what you're doing
doesn't stop it. It stops _file name_ completion, but it doesn't stop
_completion_. It just makes Bash think the word you have started is OK, and
considers it complete:

   $ svn cp a b c_
   $ svn cp a b c _

Here's a kind-of-ugly idea that has the sort of effect you want:

> # return some results that have no common prefix, so Bash won't
> # use them, but when displayed (in alphabetical order) they form
> # an error message
> COMPREPLY=( 'bash_completion:' 'only two arguments wanted' )

   $ svn cp a b c_
   bash_completion: only two arguments wanted
   $ svn cp a b c_

What happens is that when Bash gets a list of completions it _replaces_ the
corrent word with the common prefix of all the completions, unless there is no
common prefix in which case it complains and (on a second press of <TAB>) lists
the completions. This might help to explain the "svn:svn:log" problem.

This has the correct effect on the command line: it is unaltered and a beep is
given. You might not like the text that is printed. It might be possible to
make something almost invisible be printed, e.g. by returning two different
invisible words: say a space and a tab.

- Julian

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Received on Thu Nov 17 17:04:45 2005

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