Re: [Texmacs-dev] New algorithm style - need help

[Sam Liddicott]

On 09/04/11 02:32, Jan Lellmann wrote:
> Hello,
>
> I'm trying to develop a style file for structured input of algorithms. 
> I got most of it to work, including proper line numbering, 
> indentation, etc.
>
> Constructs that may have several cases, such as "if", "switch" etc. 
> are implemented using <xmacro>, so that the user can add additional 
> cases as required. Everything works, except that the indentation for 
> the <xmacro> constructs is wrong.
>
> I've been trying to get this to work for the last few days, and now 
> I'm out of ideas. So if someone can help, I'd be more than grateful.
>
> I attached the style file and a short example that demonstrates the 
> problem.
>
> Thanks,
>   Jan 

The freakiness happens between the IF macro and the if-extend macro.
If I insert: <algo-item>XXXX
before the map-args call to if-extend then it has the correct indent

If I insert: <algo-item>XXXX
as the first item inside if-extend then it has the wrong indent.

If I replace that map-args with <if-extend|hello|0>
then I don't get the extra indent.

So "map-args" combined with "document" seem to be the culprit and I 
suspect "document"

I replace with "concat" giving: 
<combine|<map-args|if-extend|concat|args>|<alg-keyword|end if>>
which has the right indent, but no new-lines.

"concat" is for wrapping content.

"document" is for blocks that cannot wrap.

This is made clearer if you use LONG LINES that would need to wrap.
It's hard to tell which you need until you decide what should happen to 
long lines.

I just moved my literate programming to wrap lines and avoiding 
macro-generation of <item> tags and instead require that the item tag 
exist in the document tree directly.

This requires:
(define-group enumerate-tag algorithmic)
in your case, so that pressing enter in algorithmic in your document 
tree will insert an <item> tag.
You can <with|item|<macro....  to redefine what item does.

Before that I handled it like you and had similar problems.

The only other idea I have is to track the nesting level and muliply the 
offset when rendering the line numbers - but it looks like you are doing 
something like that, but just not for the IF.

However my best suggestion is to explicitly use <item> as I do for 
literate programming.

And I congratulate you on your good looking style, I think it's great.

Sam