emacs kpart

emacs kpart

[Marco Correia]

Hi all,

I'm considering creating a KPart (which is a kind of KDE component suitable to 
be integrated within KDE programs, in a certain way equivalent to Gnome's 
bonobo or Windows OLE), for integrating emacs in kde apps. 

The basic idea is to launch an emacs process in the background and use the 
gnuclient-gnuserv functionality to pass the user keystrokes to the emacs 
process. The outcome of the user actions (modifications on the current 
buffer) would then have to be collected from the emacs buffer. So here is the 
issue:

Is there a way to store the contents of the current buffer and then, after 
some modification, retrieve only the part that have changed? I know that 
there are some functions for retrieving the entire or part of the buffer 
(e.g. buffer-string,buffer-substring) but if I don't know which parts have 
been modified after some point, my only choice is to retrieve the entire 
buffer, which is of course very inneficient.

Also, before I go deeply into this, I really would like to hear from an emacs 
expert what he/she thinks of this idea, or if it this impossible by some 
obvious reason that I don't know about.

thanks

-- 
Marco Correia <mvc@netcabo.pt>

Re: emacs kpart

[Richard Stallman]

    Is there a way to store the contents of the current buffer and then, after 
    some modification, retrieve only the part that have changed? I know that 
    there are some functions for retrieving the entire or part of the buffer 
    (e.g. buffer-string,buffer-substring) but if I don't know which parts have 
    been modified after some point, my only choice is to retrieve the entire 
    buffer, which is of course very inneficient.

You could look through the undo list.
You would need to prevent the undo list from being truncated
so that you could be sure it gives a complete record.

Re: emacs kpart

[Kevin Rodgers]

Marco Correia wrote:

> Is there a way to store the contents of the current buffer and then, after 
> some modification, retrieve only the part that have changed? I know that 
> there are some functions for retrieving the entire or part of the buffer 
> (e.g. buffer-string,buffer-substring) but if I don't know which parts have 
> been modified after some point, my only choice is to retrieve the entire 
> buffer, which is of course very inneficient.

You might want to look at how highlight-changes-mode keeps track of changes
to the buffer.

-- 
<a href="mailto:&lt;kevin.rodgers&#64;ihs.com&gt;">Kevin Rodgers</a>

Re: emacs kpart

[Mario Lang]

Richard Stallman <rms@gnu.org> writes:

>     Is there a way to store the contents of the current buffer and then, after 
>     some modification, retrieve only the part that have changed? I know that 
>     there are some functions for retrieving the entire or part of the buffer 
>     (e.g. buffer-string,buffer-substring) but if I don't know which parts have 
>     been modified after some point, my only choice is to retrieve the entire 
>     buffer, which is of course very inneficient.
>
> You could look through the undo list.
> You would need to prevent the undo list from being truncated
> so that you could be sure it gives a complete record.

I know at least that erc explicitly prevents insertions from the filter
function from affecting the undo-list, since that would clobber it up with
modifications the user himself never made.  It might be that
other extention packages do something roughly alike for the same reasons.

-- 
CYa,
  Mario