Re: Opening multiple files in a single buffer?

[Gregory Heytings]

Douglas Lewan:
> > I've now been using Emacs for many, many years, and there is perhaps a 
> > single feature I'm really missing, namely opening more than one file in 
> > a single buffer, with the contents of the files appearing one after the 
> > other in the same buffer, with some kind of visual separator between 
> > them. I don't know if that feature exists in other text editors.
> >
> > For example, suppose you write a book, which has fifteen chapters in 
> > files chap1.tex, ..., chap15.tex.  Opening these files in a single 
> > buffer means that you could use isearch-{forward,backward} in the whole 
> > book.  (I know that multi-isearch-buffers could be used in this 
> > particular case, but it is not as convenient to use.)  You could also 
> > use query-replace on the whole book, or reindent all files, or execute 
> > shell-command on all files at once, and so forth.  (Again I know that 
> > all this can be done with already existing features, e.g. through 
> > dired, but again I find them not as convenient as what I have in mind.)
> >
> > Each file would have its own major and minor modes, and the mode-line 
> > would adapt depending on the file corresponding to the buffer portion 
> > in which the point is currently located.
> >
> > My question is: Is this feasible, or is the one-to-one correspondence 
> > between buffers and files too deeply rooted in Emacs' codebase that it 
> > is not feasible?  If it is feasible, could this feature be considered 
> > for implementation in a future Emacs version?
>
> I would say it's feasible, but probably awkward as stated. An 
> application that implements something similar via a sequence of buffers 
> with a way of navigating next and previous and providing appropriate 
> commands via a (map) function would probably be simpler to build and 
> manage. It would also be much more natural.

In fact, what I have in mind is not an additional application, but a core 
feature, that would be transparent (or almost transparent) to everything 
else.  It would not require a rewrite of any command.  For example it 
would also be possible to narrow the (multi-file) buffer to the last X 
lines of a file and the first Y lines of the next file in the buffer.

Gregory