Re: Implement a new emphasis style to hide text

[Eric S Fraga <e.fraga@ucl.ac.uk>]

Stefan Janik <sjanjal@web.de> writes:

> Hello, 
> for some purposes I need to hide some words. (It would help to memorize these
> words). In the enriched mode I can do this just by marking the words and
> choosing M-x facemenu-set-background and then typing "black" for the "Background
> color". 
>
> In the org-mode the enriched mode doesn't work. 
>
> A perfect solution for me would be a new emphasis style: 
> Maybe something like $a hidden text.$ --> $JUSTABLACKBOX$
> (like the _underline style_ ). 
> How can I do that? (Or any other suggestions?)
>  
> Thanks.
>
> Best regard, Stephan 

Have a look at

,----[ C-h v org-emphasis-alist RET ]
| org-emphasis-alist is a variable defined in `org.el'.
| Its value is shown below.
| 
| Documentation:
| Special syntax for emphasized text.
| Text starting and ending with a special character will be emphasized, for
| example *bold*, _underlined_ and /italic/.  This variable sets the marker
| characters, the face to be used by font-lock for highlighting in Org-mode
| Emacs buffers, and the HTML tags to be used for this.
| For LaTeX export, see the variable `org-export-latex-emphasis-alist'.
| For DocBook export, see the variable `org-export-docbook-emphasis-alist'.
| Use customize to modify this, or restart Emacs after changing it.
| 
| You can customize this variable.
| 
| Value: (("*" bold "<b>" "</b>")
|  ("/" italic "<i>" "</i>")
|  ("_" underline "<span style=\"text-decoration:underline;\">" "</span>")
|  ("=" org-code "<code>" "</code>" verbatim)
|  ("~" org-verbatim "<code>" "</code>" verbatim)
|  ("+"
|   (:strike-through t)
|   "<del>" "</del>")
|  ("@" org-warning "<b>" "</b>"))
| 
| Original value was 
| (("*" bold "<b>" "</b>")
|  ("/" italic "<i>" "</i>")
|  ("_" underline "<span style=\"text-decoration:underline;\">" "</span>")
|  ("=" org-code "<code>" "</code>" verbatim)
|  ("~" org-verbatim "<code>" "</code>" verbatim)
|  ("+"
|   (:strike-through t)
|   "<del>" "</del>"))
`----

You can define your own syntax (see my addition for @) with an
associated face (second term in each list).  The face could be one which
/hides/ the text, as you desire.

HTH,
eric

-- 
: Eric S Fraga (GnuPG: 0xC89193D8FFFCF67D) in Emacs 24.0.90.1
: using Org-mode version 7.7 (release_7.7.615.g02c26)