On 5/7/06, Bill Pursell <[EMAIL PROTECTED]> wrote:
Yakov Lerner wrote:
> On 5/6/06, Bill Pursell <[EMAIL PROTECTED]> wrote:
>
>> Yakov Lerner wrote:
>> > On 5/4/06, Jack Donohue <[EMAIL PROTECTED]> wrote:
>> >
>> >> > :v (and :g) made my day..!
>> >>
>> >> Yes, I use this a lot if I just want to filter out a set of lines,
>> or see
>> >> only lines containing some text (like the old XEDIT command). But
>> >> what I'd
>> >> really like to to is continue editing in this view and not lose all
>> the
>> >> hidden lines, more like folding. I expect folding can do this, but
>> I've
>> >> never gotten it to work and it seems pretty cumbersome. I'm looking
>> >> for a
>> >> simple solution involving maybe a couple of command I can make a
>> map for.
>> >>
>> >> I guess I'm looking for a g or v command that folds the lines
>> instead of
>> >> actually deleting them.
>> >
>> >
>> > I guess the mappings below are simple enough. If you prefer
>> > to keep it to just couple of lines, you can remove mapping for <F5>
>> > and whole function TogglePatternBasedFolding(). What remains is
>> > just 3 lines (maps for f2, f3, and f3). But I find tri-state toggle
>> > (f5) also useful.
>> >
>> > " Simple pattern-based folding.
>> > " How to use: (1) perform searh (so that vim remebers search pattern),
>> > " (2) press f2, f3 f4, or press f5 repeatedly.
>> > "
>> > " F2 - fold lines that match current-search-pattern (cf :v//p)
>> > " F3 - fold lines that do not match current-search-pattern (cf :g//p)
>> > " F4 - open all folds
>> > " F5 - tri-state toggle between f2-f3-f4
>> >
>> > map <silent><F2> :set foldexpr=getline(v:lnum)=~@/ foldmethod=expr
>> > foldenable<cr>zM
>> > map <silent><F3> :set foldexpr=!(getline(v:lnum)=~@/) foldmethod=expr
>> > foldenable<cr>zM
>> > map <silent><f4> :set nofoldenable<cr>
>> > map <silent><f5> :call TogglePatternBasedFolding()<cr>
>> >
>> > function! TogglePatternBasedFolding()
>> > if &foldenable && &foldmethod=='expr' && &foldexpr[0] == '!'
>> > :set nofoldenable | redraw | echo "all folds opened"
>> > elseif &foldenable && &foldmethod=='expr' && &foldexpr[0] == 'g'
>> > :set foldexpr=!(getline(v:lnum)=~@/) foldmethod=expr foldenable
>> > normal zM
>> > redraw | echo "lines not matching /".@/."/ folded"
>> > else " &foldenable && &foldmethod=='expr' && &foldexpr[0] == 'g'
>> > :set foldexpr=getline(v:lnum)=~@/ foldmethod=expr foldenable
>> > normal zM
>> > redraw | echo "lines matching /".@/."/ folded"
>> > endif
>> > endfun
>> >
>>
>> That type of thing works nicely, except for the fact that as
>> soon as you set foldmethod=expr, you lose any other syntax based
>> folding that's in place. Is it possible to do something like
>> foldmethod+=expr, so that the syntax based folding remains in
>> effect? I don't believe that can be done, but I'd love to
>> hear suggestions for a work-around.
>>
>> I originally was hoping to do what Jack was asking for, which is
>> to hide the lines and continue working in the buffer, but in
>> retrospect, that may not be particularly safe. Filtering to
>> a temporary buffer will probably satisfy me.
>>
>> Thanks for all the suggestions.
>
>
> It's easy to add saving of preexisting fold-rules in the
> mappings. In the toggle mapping, the 3rd state would
> be restoration of old mappings instead of disabled folding.
>
> You can do it yourself.
> It's easy. Just assign &foldmethod, &foldexpr &foldenable
> etc to global variables, and make a mapping to restore it.
>
I don't just want it restored, though. I want both types of
folding enabled simultaneously.
I think vim cannot do this.
Otoh, leaving foldmethod=expr,
and playing with expressions (||,&& etc) you can possibly
achieve something like this.
Yakov
