Patch: plugin/gzip.vim, maintain compression levels

[Bram Moolenaar]

James -

> > I'm afraid I have given you a wrong hint.  When appending the compressed
> > file is not in a buffer, thus then it doesn't work.  And that's when it
> > would be most useful.
> >
> > For Vim 7 we can use the readfile() function.  I don't know a simple,
> > portable solution for Vim 6.3.
> 
> For Vim 6.3, are you going to include this functionality just when
> writing or not at all?

I'm including new features in Vim 7 only.  6.3 is the stable version,
only bug fixes.

> > There would be an error when using ":w file.gz", b:compression would not
> > be set.  It's easy to add a check for that:
> 
> I specifically set b:compression to "" at the beginning of
> set_compression to avoid that problem.  It worked fine with my tests,
> but your approach is cleaner and more obvious.

I thought of allowing the user to specify the argument.  Although it
must be reset when reading a file, otherwise it could come from another
file perhaps.

I haven't looked at the file format spec, but it's strange that only
maximum and minimum compression are stored.

- Bram

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