Re: How to conceal entire line including newline?

Hi AK!

On Mi, 05 Okt 2011, AK wrote:

> On 10/05/2011 04:11 PM, Christian Brabandt wrote:
> >Hi AK!
> >
> >On Mi, 05 Okt 2011, AK wrote:
> >
> >>On 10/05/2011 03:36 PM, Christian Brabandt wrote:
> >>>Hi AK!
> >>>
> >>>On Mi, 05 Okt 2011, AK wrote:
> >>>
> >>>>On 10/05/2011 02:41 PM, Christian Brabandt wrote:
> >>>>>On Mi, 05 Okt 2011, AK wrote:
> >>>>>>Hi, I want to have an overview of code without comments or
> >>>>>>docstrings, with their lines completely omitted when in
> >>>>>>conceal mode, without showing them as blank lines.
> >>>>>>
> >>>>>>How can I do that?
> >>>>>
> >>>>>You can't. Use folding to hide them away.
> >>>>>
> >>>>Wow, why is conceal so bizarrely hindered? Even before
> >>>>conceal feature was created, I've often thought that it
> >>>>would be extremely useful to temporarily conceal some
> >>>>types of lines.
> >>>
> >>>Well you can hide away lines, but I think you won't be able to
> >>>completely hide away the new line character. This makes sense, as for
> >>>this folding can be used.
> >>
> >>
> >>Well, here's an example:
> >>
> >># comment
> >>code
> >># comment
> >># second line
> >>code
> >># comment
> >>code
> >>
> >>I want to have:
> >>
> >>code
> >>code
> >>code
> >>
> >>Folding cannot do that because it does not conceal, it only folds.
> >
> >Close enough:
> >:setl foldenable foldmethod=expr foldminlines=0
> >foldexpr=getline(v:lnum)=~'^#'?1:0 foldtext=v:folddashes foldlevel=0
> >fillchars-=fold:-
> >
> >which makes it:
> >-
> >code
> >-
> >code
> >-
> >code
>
> Well, I already did use 'invisible' folds to do
> similar type of hiding, but I was really excited
> about conceal feature because I thought it would
> be able to conceal lines.
>
> The reason I want to get rid of those lines is that
> you can read a lot more code in the same window
> and it makes it much, much easier to do code review
> without jumping back and forth.
>
> So, it's really odd to me that conceal does not work
> for lines. It seems like the most useful part of
> conceal is handicapped by design.
>
> Is it possible to make a small change to the vim
> code to allow this? I would not mind compiling my
> own version of Vim to allow this even though the
> patch will need to be applied on every upgrade.
>
> I don't have experience with C or editing Vim code
> so it would be really helpful if someone told me
> if it would be easy to add and where I should start.
>
> I would be willing to spend a few hours on this,
> but if it's going to be harder than that, I'll just
> use folding and syntax highlight to make folds
> invisible.

I think this is harder then it sounds, because concealing is hard to get
right, has some nasty corner cases and the concealing code still has
some bugs (see :h todo.txt). So I don't think this is likely to change
anytime soon.

regards,
Christian

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