set different colors for different link types

set different colors for different link types

[Christian Wittern]

Hi there,

In the archives, I have seen on and off references to a new, extensible
syntax that would go beyond /italic/, *bold* and =code=, but I have seen no
traces of seeing it implemented.

For the time being, therefore I am settling on having different linktypes
coming up in different colors, which I hope is doable, but again, I found no
immediate solution.  I wonder if somebody has an idea of how to go about
this.  What I would like to see is that, for example:

[[file://path/to/my file][myfile]]  comes out visibly different from
[[http://www.example.com/path/to/my file][myfile]] , for example the one in
red, the other in blue.

Any help appreciated,

Chris

Re: set different colors for different link types

[Michael Brand]

For links with a description I always just repeat the protocol tag
there manually:
[[file://path/to/my file][file: myfile]]
[[http://www.example.com/path/to/my file][http: myfile]]

Together with the space after the colon this shows, also immediately,
if you look only at the link description or at the link itself:
[[file://path/to/my file]]
[[http://www.example.com/path/to/my file]]

This color-independent solution works even if colors would not be
available occasionally like with some terminal configs.

Michael

2011/4/29 Christian Wittern <cwittern@gmail.com>:
> In the archives, I have seen on and off references to a new, extensible
> syntax that would go beyond /italic/, *bold* and =code=, but I have seen no
> traces of seeing it implemented.
>
> For the time being, therefore I am settling on having different linktypes
> coming up in different colors, which I hope is doable, but again, I found no
> immediate solution.  I wonder if somebody has an idea of how to go about
> this.  What I would like to see is that, for example:
>
> [[file://path/to/my file][myfile]]  comes out visibly different from
> [[http://www.example.com/path/to/my file][myfile]] , for example the one in
> red, the other in blue.

Re: set different colors for different link types

[Christian Wittern]

Hi Michael,

Thank you for your suggestion.  However, I would prefer not to clutter the 
text with repeating the protocol there.  Also, the example I gave is mainly 
for illustration, in the way I use it, the description would not show the 
filename, but some other text.

Chris

On 2011-04-30 00:18, Michael Brand wrote:
> For links with a description I always just repeat the protocol tag
> there manually:
> [[file://path/to/my file][file: myfile]]
> [[http://www.example.com/path/to/my file][http: myfile]]
>
> Together with the space after the colon this shows, also immediately,
> if you look only at the link description or at the link itself:
> [[file://path/to/my file]]
> [[http://www.example.com/path/to/my file]]
>
> This color-independent solution works even if colors would not be
> available occasionally like with some terminal configs.
>
> Michael
>
> 2011/4/29 Christian Wittern<cwittern@gmail.com>:
>> In the archives, I have seen on and off references to a new, extensible
>> syntax that would go beyond /italic/, *bold* and =code=, but I have seen no
>> traces of seeing it implemented.
>>
>> For the time being, therefore I am settling on having different linktypes
>> coming up in different colors, which I hope is doable, but again, I found no
>> immediate solution.  I wonder if somebody has an idea of how to go about
>> this.  What I would like to see is that, for example:
>>
>> [[file://path/to/my file][myfile]]  comes out visibly different from
>> [[http://www.example.com/path/to/my file][myfile]] , for example the one in
>> red, the other in blue.


-- 
  Christian Wittern
  Institute for Research in Humanities, Kyoto University
  47 Higashiogura-cho, Kitashirakawa, Sakyo-ku, Kyoto 606-8265, JAPAN

Re: set different colors for different link types

[Jambunathan K]

> Hi Michael,
>
> Thank you for your suggestion.  However, I would prefer not to clutter
> the text with repeating the protocol there.  Also, the example I gave
> is mainly for illustration, in the way I use it, the description would
> not show the filename, but some other text.
>
> Chris
>
> On 2011-04-30 00:18, Michael Brand wrote:
>> For links with a description I always just repeat the protocol tag
>> there manually:
>> [[file://path/to/my file][file: myfile]]
>> [[http://www.example.com/path/to/my file][http: myfile]]
>>
>> Together with the space after the colon this shows, also immediately,
>> if you look only at the link description or at the link itself:
>> [[file://path/to/my file]]
>> [[http://www.example.com/path/to/my file]]
>>
>> This color-independent solution works even if colors would not be
>> available occasionally like with some terminal configs.
>>
>> Michael
>>
>> 2011/4/29 Christian Wittern<cwittern@gmail.com>:
>>> In the archives, I have seen on and off references to a new, extensible
>>> syntax that would go beyond /italic/, *bold* and =code=, but I have seen no
>>> traces of seeing it implemented.
>>>
>>> For the time being, therefore I am settling on having different linktypes
>>> coming up in different colors, which I hope is doable, but again, I found no
>>> immediate solution.  I wonder if somebody has an idea of how to go about
>>> this.  What I would like to see is that, for example:
>>>
>>> [[file://path/to/my file][myfile]]  comes out visibly different from
>>> [[http://www.example.com/path/to/my file][myfile]] , for example the one in
>>> red, the other in blue.

The easiest way to figure out the protocol is to "pretend" that you are
editing the link and thereby have the curtain raised a bit to reveal the
backstage. Do a C-c C-l or M-x org-insert-link RET (with cursor right
over the link) followed by 'C-g'ing.

If you are willing to hack something together, here is a possible entry
points for attack. With M-x highlight-regexp you could add persistent
regexp patterns for fontification.

1. Do a M-x describe-text-properties RET on a link to see what is under
   the hood.

   For example in one of my links I see

--8<---------------cut here---------------start------------->8---
Text content at position 509:

There are text properties here:
  face                 org-link
  font-lock-multiline  t
  fontified            t
  help-echo            "LINK: file:src/org-jambu/lisp/org-odt.el"
  keymap               [Show]
  mouse-face           highlight
  org-no-flyspell      t
--8<---------------cut here---------------end--------------->8---

2. Start with org-descriptive-links set to nil (makes all components of
   link visible)

3. Start with org-bracket-link-analytic-regexp as a starting regexp
   which needs to be fine grained into say web urls, file urls etc etc

4. See org-activate-bracket-links for ideas on how org accomplishes
   highlighting correctly.

C-h hi-lock-mode
C-h f highlight-regexp 
C-h v hi-lock-file-patterns-policy
C-h v org-descriptive-links
C-h v org-angle-link-re
C-h v org-bracket-link-regexp
C-h v org-bracket-link-analytic-regexp
C-h f org-activate- <TAB> (look for functions like
org-activate-bracket-links etc)

Jambunathan K.
--