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Re: indirect-region (make-indirect-buffer) breaks major-mode fontificat

From: senny
Subject: Re: indirect-region (make-indirect-buffer) breaks major-mode fontification
Date: Wed, 18 Nov 2009 05:52:02 -0800 (PST)
User-agent: G2/1.0

On 18 Nov., 14:30, Lennart Borgman <address@hidden> wrote:
> On Wed, Nov 18, 2009 at 8:54 AM, senny <address@hidden> wrote:
> >> > After that discussion I think I will give nXhtml an other shot. When I 
> >> > got some spare
> >> > time I will look more into nXhtml and will send you my thoughts.
> >> Ok, there is a new beta now at
> >>
> >> This has support for server side javascript. Just do
> >>   M-x ssjs-html-mumamo-mode
> >> to turn it on.
> > Hey Lennart
> Hi Senny,
> > I just played around with the nxhtml beta you uploaded. The
> > highlighting seems to work good and the cursor movement relay has been
> > increased. After just a few minutes using the mode I've got some
> > complaints tough.
> Thanks for testing.
> >  - When I scroll through pages (using scroll-down and scroll-up) the
> > performance is poor
> It is a bit slower the first time you scroll, since syntax coloring
> has to be handled a bit differently. Normally Emacs tries to guess
> what to do. It does not check everything from the beginning of the
> file before coloring the syntax. It looks a little bit backwards and
> tries to guess how to color the syntax.
> That is good for many reasons, for example scrolling will be faster.
> However when there are multiple major modes in different parts of the
> buffer a bit more have to be done. It has to know what major mode (ie
> programming language) there is in the part it is going to put syntax
> color on.
> You may think that the same stategy as above can be used and all that
> is needed is to look back a little bit. This was how it worked before
> in nXhtml.
> It is faster, but unfortunately it often does not work. There were a
> lot of complaints about this. So now nXhtml (or rather MuMaMo, part of
> nXhtml) looks from the beginning just to decide what major mode to
> use. Actually it have to be rather carefully when searching for the
> this. MuMaMo caches this information. The first time you scroll
> through a piece of the file it may be slow, but after that it will be
> faster.
> Maybe I should explain this somewhere, but it is a bit hard to know where.
> >  - When I call (cleanup-buffer => starterkit function to indent,
> > untabify and trailing whitespace removal)
> >    It takes like 6 seconds to clean the buffer where nxml mode takes
> > around half a second.
> Is this for the example you sent me? That sounds a bit strange. Can
> you please send me a copy of cleanup-buffer so I can see what it does?
> Can you perhaps also try this in a fresh Emacs with just nXhtm loaded
> + just the function cleanup-buffer. To start a fresh Emacs with just
> nXhtml you can do
>    M-x emacs-Q-nxthml
> >  - There were still some indentation bugs
> Yes, that is likeley, those are a bit hard. If you tell me more about
> what you have seen it might be possible to fix them.
> >  - The mode tried to validate the page all the time, which takes
> > about a second and blocks emacs
> Validation should of course not block Emacs, but if that happens it is
> probably due to some interaction with the multi major mode.
> Unfortunately the integration of parsers (like the one from nxml-mode)
> can not be done very well without rewriting the parsers at the moment.
> (I have some ideas for how to do this, but some very deep changes in
> Emacs are necessary for them.)
> It might be better for you to use it without the parse (but then XHTML
> completion disappears too). You can do that by selecting a multi major
> mode which have "html" in its name instead of "nxhtml", for example:
>    M-x html-mumamo-mode
> > I tried everything with the following
> Thanks. I have tried that too and I works quite good for me (despite my old 
> pc).
> I am using latest CVS Emacs (not yet released). What version of Emacs
> are you using?
> Is there perhaps something special in your .emacs (or some other startup 
> file)?
> > Regards,
> > Senny

This discussion is probably not the right place to start a discussion
about nXhtml
features and bugs. You should probably name me a place where we can go
detail about the bugs I have with nXhtml mode.
To conclude: I am still looking for a fontification fix with the
"indirect" buffer
approach. All the fuzz i just had with one page and nXhtml shows me,
that I am better
served with a quick and dirty solution. I need things to work fast and
work as expected.
Of course there could be conflicts with nXhtml and my .emacs
configuration (which
has grown fairly large and is available here:
but I don't have the time to dig into nXhtml and figure out how
everything works.

Thanks for your assistance and the fast feedback.

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