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Re: [Orgmode] Pretty org-entities in org-mode buffers


From: Carsten Dominik
Subject: Re: [Orgmode] Pretty org-entities in org-mode buffers
Date: Sat, 8 May 2010 07:15:41 +0200


On May 7, 2010, at 5:27 PM, Eric Schulte wrote:

Carsten Dominik <address@hidden> writes:

Dear Eric,

this is fantastic.

Great, Thanks

This is kind of like X-symbol, only that I can just write my trusted
LaTeX macros and get all those characters. Makes me think that I need
to add a few more symbols that I commonly use in math expressions.


Yea, I have the following org-entites customization in my setup which
covers some of the symbol names I commonly expect.  It's been growing
the more I use org-entities.

--8<---------------cut here---------------start------------->8---
(add-to-list 'org-entities


There is now a special user variable that can be used to add your own
entities, if you want to avoid messing with this constant.  But I guess
this is a matter of taste.
I will also accept patches that will add to org-entities, in a limited way.

- Carsten

'("supseteq" "\\supseteq" t "&supe;" "[superset of or equal to]"
              "[superset of or equal to]" "⊇"))
(add-to-list 'org-entities
'("subseteq" "\\subseteq" t "&sube;" "[subset of or equal to]"
              "[subset of or equal to]" "⊆"))
(add-to-list 'org-entities
'("subseteq" "\\subseteq" t "&sube;" "[subset of or equal to]"
              "[subset of or equal to]" "⊆"))
(add-to-list 'org-entities
            '("leq" "\\leq" t "&le;" "<=" "<=" "≤"))
(add-to-list 'org-entities
            '("geq" "\\geq" t "&ge;" ">=" ">=" "≥"))
--8<---------------cut here---------------end--------------->8---


I am wondering if we could be a bit more generous with the regular
expression.  For example, I would love for $\alpha=\beta$ to show the
symbols as well.

agreed, maybe this would be better (using [:alnum:])?  The only reason
for the restriction is to keep symbols from appearing mid way through
typing out some other symbol or word.

--8<---------------cut here---------------start------------->8---
(defun org-pretty-entities ()
 (font-lock-add-keywords
  nil (mapcar
       (lambda (el)
         (list
(concat "(?\\(" (regexp-quote "\\") (nth 0 el) "[^[:alnum:]]" "\\)") `(0 (progn (compose-region (match-beginning 1) (- (match- end 1) 1)
                                     ,(nth 6 el)) nil))))
       org-entities)))
--8<---------------cut here---------------end--------------->8---


Also there should be a switch for turning this on and off.

I would like to integrate this code into org-entities.el.


Those both sound great.  It would take a little bit of effort to look
into how to remove font-lock keywords.  If you have the time and
inclination please go ahead with this, otherwise I should be able to
take a shot at it myself in the next week or two -- I'm in the middle of
my final exams right now.


Thanks for all your contributions, which continue to make Org-mode so
much richer.


It's my Pleasure -- Eric


- Carsten


On May 5, 2010, at 6:19 PM, Eric Schulte wrote:

Hi,

Recently I've been making use of org-entites for exporting my greek/
math
heavy class notes to HTML.  I'm really loving the results.

This morning I've started playing around with the below function
`org-pretty-entities', which is adapted from Phil Hagelberg's
`pretty-lambdas'[1]. Calling this function in an org-mode buffer will
have the effect of fontifying all org-entities text strings as the
character which they represent, so \Delta is replaced with Δ, \lambda
with λ, \in with ∈, and so forth.

I've just started playing with this, and I make no guarantees as to
it's
safety or utility, but I was very pleasantly surprised by the
simplicity
of the function, and how nice it's been to see my special characters
appear in org-mode buffers as I type.

#+begin_src emacs-lisp :results silent
(defun org-pretty-entities ()
  (interactive)
  (font-lock-add-keywords
   nil (mapcar
        (lambda (el)
          (list
           (concat "(?\\(" (regexp-quote "\\") (nth 0 el) "[\s]" "\
\)")
           `(0 (progn (compose-region (match-beginning 1) (-
(match-
end 1) 1)
                                      ,(nth 6 el)) nil))))
        org-entities)))

(org-pretty-entities)
#+end_src

To try this out, just evaluate the above code block inside of an
org-mode buffer, then starting typing out org-entities.

Hope others find this useful.

Best -- Eric

Footnotes:
[1]  
http://github.com/technomancy/emacs-starter-kit/blob/master/starter-kit-defuns.el#L135


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- Carsten

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