56479Re: Why is there no :foldupdate?
- Apr 2, 2010On 31/03/10 23:27, Christian Brabandt wrote:
> (fullquote, because copying vim_dev)Doesn't this patch duplicate the already existing zx command?
> On Mi, 31 Mär 2010, Christian Brabandt wrote:
>> sometimes I am using fold expressions to simply hide away unwanted
>> parts. Usually this boils down to
>> :set fdm=expr fde=getline(v:lnum)!~getreg('/',1)
>> While this works fine, it is only limited to whatever was in register @/
>> when this setting was entered. Now this leaves an interesting question:
>> When are 'foldexpr' reevaluated (are they at all)? Reading :h fold.txt
>> does not mentioned when the fold expressions are reevaluated and folds
>> are updated (or I might have missed it).
>> Now the obvious cure to this is to reenter the foldexpression. So if I
>> am searching for a different term, I need to enter
>> :set fde=getline(v:lnum)!~getreg('/',1)
>> and the folds will be updated.
>> Of course, I could define my own :Foldupdate like this:
>> :com! Foldupdate :exe "set fde=".&fde
>> But this looks so fundamental, that I am wondering, whether I am the
>> only one who is missing :foldupdate. Does anybody else think so? Or am I
>> missing something obvious?
>> PS: Looking at the source, it does not seem too hard, to define an extra
>> :foldupdate command. Does that sound like a reasonable idea? I could
>> prepare a patch for this, if there is interest.
>> (Actually, I'd really like an RegisterChanged autocommand event, which
>> could trigger an :foldupdate)
> Ok, here is a patch, that implements :foldupdate as ex command and zU as
> normal mode command.
> Here is the testcase:
> go to the vim-Src directory and execute the attached vim-script:
> chrisbra t41:~/vim/src % ./vim -u NONE -N -S foldupdate.vim eval.c
> Note, how the folding will be wrong, after the second search command
> (and I have found no way to refresh the folding. zx and zX do not work,
> though its description led me believe it could have. Well actually I
> found one way: filtering the whole buffer through cat will also update
> the folding)
> When recompiling vim with the patch, the folding will be updated, when
> :foldupdate is called.
If it does, and you can't remember it, I suggest the following ;-)
:command -nargs=0 -bar Foldupdate normal zx
Any clod can have the facts, but having an opinion is an art.
-- Charles McCabe
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