strange generate-new-buffer-name behaviour

strange generate-new-buffer-name behaviour

[Alin Soare]

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I discovered an error while reading the info page for generating a name for
an unexisting buffer :

In 27.3 Buffer Names I see written so:

          (generate-new-buffer-name "foo")
               => "foo<5>"
          (generate-new-buffer-name "foo" "foo<3>")
               => "foo<3>"
          (generate-new-buffer-name "foo" "foo<6>")
               => "foo<5>"

However, for me all these forms evaluate to "foo"

Did I miss something, or is this an error concerning the second parameter?



Alin

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Re: strange generate-new-buffer-name behaviour

[Ken Raeburn]

On Dec 11, 2010, at 14:26, Alin Soare wrote:
> I discovered an error while reading the info page for generating a name for an unexisting buffer :
> 
> In 27.3 Buffer Names I see written so:
> 
>           (generate-new-buffer-name "foo")
>                => "foo<5>"
>           (generate-new-buffer-name "foo" "foo<3>")
>                => "foo<3>"
>           (generate-new-buffer-name "foo" "foo<6>")
>                => "foo<5>"
> 
> However, for me all these forms evaluate to "foo"

This might be obvious, but: Do you actually have existing buffers named "foo", "foo<2>", "foo<3>", and "foo<4>" as described in the paragraph before that example code?

Ken

Re: strange generate-new-buffer-name behaviour

[Alin Soare]

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>
>
> >           (generate-new-buffer-name "foo")
> >                => "foo<5>"
> >           (generate-new-buffer-name "foo" "foo<3>")
> >                => "foo<3>"
> >           (generate-new-buffer-name "foo" "foo<6>")
> >                => "foo<5>"
> >
> > However, for me all these forms evaluate to "foo"
>
> This might be obvious, but: Do you actually have existing buffers named
> "foo", "foo<2>", "foo<3>", and "foo<4>" as described in the paragraph before
> that example code?
>

I did not create the buffers with the given names.

alin

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Re: strange generate-new-buffer-name behaviour

[Ken Raeburn]

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On Dec 11, 2010, at 17:53, Alin Soare wrote:
> 
> >           (generate-new-buffer-name "foo")
> >                => "foo<5>"
> >           (generate-new-buffer-name "foo" "foo<3>")
> >                => "foo<3>"
> >           (generate-new-buffer-name "foo" "foo<6>")
> >                => "foo<5>"
> >
> > However, for me all these forms evaluate to "foo"
> 
> This might be obvious, but: Do you actually have existing buffers named "foo", "foo<2>", "foo<3>", and "foo<4>" as described in the paragraph before that example code?
> 
> I did not create the buffers with the given names.

Then that explains why you're getting different results.  The function gives you back "foo" if that buffer doesn't exist, or finds a number to append so that it doesn't match the name of an existing buffer.  The text before the example explains how it assumes some of those buffers already exist.

Ken

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