Doing M-x org-babel-lob-files called up a customization buffer that allowed
me to put in many separate file paths. I did this for ../a.org and ../b.org.

a.org:

#+name: myadd
#+begin_src lisp :session
(defun myadd (x y)
  (+ x y))
#+end_src

b.org:

#+name: multi_x2
#+begin_src lisp :session
(defun multi_x2 (x)
  (* 2 x))
#+end_src

then in c.org:

#+name: add&multi_x2
#+begin_src lisp :session
(defun add&multi_x2 (x y)
  (multi_x2 (myadd x y)))
#+end_src

but upon C-c C-c in c.org SLIME didn't know about myadd or multi_x2 ...
until I did C-c C-c in both a.org and b.org for the respective functions.
Then c.org's add&multi_x2 knew about the helper functions. That is
wonderful and allows a very distributed and modular approach to org-mode LP
for Lisp. However, it would be nice if I didn't have to acquaint my SLIME
session by hand all of my ingested babel-lob files. Any way to have this
happen automatically upon C-c C-c-ing my main org file? I found this
<https://lists.gnu.org/archive/html/emacs-orgmode/2010-09/msg01172.html>
discussion,
but I don't believe it really addresses my wish.

LB



On Fri, Oct 30, 2015 at 8:55 PM, Thomas S. Dye <tsd@tsdye.com> wrote:

> Aloha Lawrence,
>
> Lawrence Bottorff <borgauf@gmail.com> writes:
>
> > There are many, many Babel examples, but I can't seem to find this
> > functionality: A function in a Lisp code block in one org file is to be
> > called from a Lisp code block in another org file. Is this possible? I
> know
> > you can stick stuff into your personal "Library of Babel," but I just
> want
> > to write a Lisp block that calls a function from another org file. I'll
> > have SLIME running, of course.
> >
> >
> > file1.org:
> > ...
> >  #+begin_src lisp
> > (defun foo ()
> >    (...))
> > #+end_src
> >
> > is then called from. . .
> >
> > file2.org:
> > ...
> > #+begin_src lisp
> > (defun baa ()
> >   (foo))
> > #+end_src
>
> Any Org mode file can function as Library of Babel.  In your case,
> (org-babel-lob-ingest path/to/file1.org) should do what you want.  Note
> that org-babel-lob-ingest is bound to C-c C-v i.
>
> hth,
> Tom
>
> --
> Thomas S. Dye
> http://www.tsdye.com
>