On Oct 2, 2008, at 2:03 AM, Eric Schulte wrote:
Paul R <[EMAIL PROTECTED]> writes:
On Wed, 01 Oct 2008 12:45:34 -0700, "Eric Schulte" <[EMAIL PROTECTED]
> said:
This raises an issue I've been running into recently, If I have
a multi-line elisp function (I guess same issue would apply for
multi-line shell commands) that I want to use from an org file (for
example to compute table columns), is there a way to save and load
the function from the org file? I've tried multiline [[elisp: ]]
links but they don't work well, maybe something like...
maybe you can use the emacs facility to load code when visiting
a file. For more information, read the following info node :
File: emacs, Node: Specifying File Variables
I looked at this, but then I ran across org-eval.el in the
org/contrib/lisp directory. With (require 'org-eval) in my .emacs I
can
put something like the following
<lisp>
(defun my-specific-function-for-this-file (org-tabl-cell)
(format "%S"
(do-something-special
(read org-tabl-cell))))
</lisp>
in an org file and org-eval is nice enough to evaluate the code
defining
the function upon opening the file, to display only the name of the
function in a special face, and to allow me to edit the function in
the
appropriate mode with C-' (also works for ruby/shell/python/etc...).
Everything I could have asked for!
It nice to request a feature and find it's already implemented.
Before starting to use org-eval.el, I'd like to make sure that
everyone understands that loading org-eval.el turns any org-mode file
into an executable. That means that you have to start being careful
with org-mode files you receive from others or download from the
internet. Just like you would run a program from the web only if you
trust the source, you should then only load such files into Emacs if
you trust the source. I am not saying this to keep you from using org-
eval, I am am using it myself, but please be aware of this issue.
One more remark: a <lisp> tag is evaluated by jit-lock (i.e. by the
font-lock mechanism), just before Emacs tries to make it visible. The
reason for this is that the original indent for this functionality was
to produce and display dynamic content on a page. In large files,
font locking can be delayed until the segment in question comes into
view in the Emacs window.
To be sure to get this code evaluated immediately when visiting a
file, you might want to put the snippets close to the beginning of
the file.
- Carsten
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