On 31/03/10 23:27, Christian Brabandt wrote:
(fullquote, because copying vim_dev)
On Mi, 31 Mär 2010, Christian Brabandt wrote:
Hi,
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.
regards,
Christian
(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 [1296]% ./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.
regards,
Christian
Doesn't this patch duplicate the already existing zx command?
If it does, and you can't remember it, I suggest the following ;-)
:command -nargs=0 -bar Foldupdate normal zx
Best regards,
Tony.
--
Any clod can have the facts, but having an opinion is an art.
-- Charles McCabe
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