56476Re: Why is there no :foldupdate?
- Mar 31, 2010(fullquote, because copying vim_dev)
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
When recompiling vim with the patch, the folding will be updated, when
:foldupdate is called.
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