Re: [Texmacs-dev] Document tree manipulation

[Henri Lesourd]

address@hidden wrote:

> Hi everybody
>
> I was thinking of making a texmacs plug-in and for that I would like  
> to start off by making a scheme file with provision for changing the  
> text colors according to a given parameter. I have made a parser and  
> suppose I would like the text to appear green if a string was parsed  
> correctly depending on my parser's output and red otherise.

OK.


> I could  parse the string when the mouse pointer has been taken off 
> the string.

This you cannot do it, it is currently impossible to
detect the movements of the mouse from inside Scheme.
But you can redefine a keyboard shortcut for this
purpose. Have a look at : 
http://www.ags.uni-sb.de/~henri/texmacs/aTeXmacsTutorial.pdf

for information about exactly how to make a TeXmacs
plugin (location of the different files you must create),
how to write stylesheets (this includes defining macros),
and how to redefine keyboard shortcuts, menus, etc. by
means of Scheme.


> The colors should be changed by manipulating the document tree and I 
> would like to know the files where I would find the appropriate  
> functions for doing the same.

You should write a little stylesheet for changing colors, for example
you could define a markup "colored" with two parameters :
[[
<assign|colored|<macro|c|body|<with|color|<arg|c>|<arg|body>>>>
]]

, and then change a chunk (e.g. : "Hello!") of the document by
means of embedding it inside a "colored" markup, e.g. :
[[
<colored|green|Hello !>
]]

The embedding itself could be performed by means of a (tree-set! ...)
function call from inside Scheme.


> Any further advice is welcome as well.  Please help!
For manipulating the document tree, have a look at the
attached archive, which contains the a demo plugin with
a function "xmlize-tree" that recursively traverses the
current buffer (from the current location of the cursor).

The basic tree API of TeXmacs is :
[[
(path->tree PATH) -> TREE
   /* the path (i) is the path of the buffer #i */
(tree-label TREE) -> INT
(tree-ref TREE INT) -> TREE
(tree-set! TREE INT TREE) -> VOID
(tree-insert TREE INT TREE) -> VOID
   /* performs an insert *before* the  given position */
(tree-remove ...)
]]

If you read a little bit Scheme, you can probably extract
all the info you need from the tutorial & from the code
of the attached example plugin.

Any other question welcomed anyway.


Best, Henri

spreadsheet0.tar
Description: Unix tar archive