mailing-list for TeXmacs Users

[Benno Dielmann <address@hidden>]

On Saturday 11 October 2008 05:25:54 Enrique Perez-Terron wrote:
| On Wed, 2008-10-08 at 13:53 +0200, Benno Dielmann wrote:
| > Well, there is one (though suboptimal): You can assign the item-nr
| > variable at the start of the second list. Do do this, move the cursor to
| > the start of the second list to the left of the numbering but still in
| > the list environment (blue frame). Then put an assign statement there
| > (e.g. by entering \assign) and enter "item-nr" (without the "") into the
| > first field and the number of the last item of the second list into the
| > second field. In your example, this would be "2" (without "").
| >
| > The bad thing is, if you expand the first list by adding more items, you
| > always have to adapt the value you assign to item-nr. I tried to put a
| > label in the first list and a reference to it in the assign field, but
| > Texmacs doesn't eat it, probably because it's a string and not a number.
| > I didn't find a way to convert strings to numbers, either.
|
| In a package file:
|
|  <assign|list-save-state|\
|     <macro|label|\
|        <quasi|\
|           <assign|<unquote|<arg|label>>|\
|               <value|item-nr>\
|
|  <assign|list-restore-state|\
|     <macro|label|\
|        <assign|item-nr|\
|            <value|<arg|label>>\
|
|
| In a document using the package:
|
|   <\enumrate-numeric>
|     <item>This is the text of the first item.
|
|     <item>This is the text of the second item.
|
|     <item>This is the text of the third item.<list-save-state|potato>
|   </enumerate-numeric>
|
|   Some unstructured remarks.
|
|   <\enumerate-numeric><list-restore-state|potato>
|     <item>This is the text of the fourth item.
|
|     <item>This is the text of the fifth item.
|   </enumerate-numeric>
|
| Here I have used the label "potato" to save and restore the state.  A
| potential problem is that some other package or even texmacs itself
| could be using the word "potato" to name some some environment variable.
| To minimize the risk of name collisions, the macros could have
|
|   <merge|list-saved-state-|<arg|label>>
|
| instead of just <arg|label>, whereever that occurs.  That would make the
| label be "list-saved-state-potato" internally.
|
| What still remains a disadvantage with all this is that unless one
| switches to source view, the macro calls are hidden, and there is
| nothing in the user interface that interacts with the macros.  If you
| forget the label you used, or forget that you put in the
| list-restore-state, and later return to the document,  you will be
| mystified.

That's what flags are for... Look:

 <assign|list-save-state|\
    <macro|label|\
       <flag|list-save-state|orange>\
       <quasi|\
          <assign|<unquote|<arg|label>>|\
              <value|item-nr>\
          >>>>
 <assign|list-restore-state|\
    <macro|label|\
       <flag|list-restore-state|orange>\
       <assign|item-nr|\
           <value|<arg|label>>\
       >>>

Now you get flags displayed where you entered the macros (assuming you 
switched them on in Document->View->Informative Flags)

I chose orange as flag color; you can choose any other color. 

But thanks a lot for these macros. I never really understood these "quote", 
"unquote", "quasiquote" thingies... Is there a documentation about these?

| I just tried. It worked. Here is the contents of
| .TeXmacs/packages/save-state.ts:
|
| <TeXmacs|1.0.6.15>
|
| <style|source>
|
| <\body>
|  
| <assign|list-save-state|<macro|mylabel|<quasi|<assign|<unquote|<merge|list-
|saved-|<arg|mylabel>>>|>>>>
|
|  
| <assign|list-restore-state|<macro|mylabel|<assign|item-nr|<value|<merge|lis
|t-saved-|<arg|mylabel>>>>>> </body>
|
| To use it, in the second list environment, I inserted the environment
| using the gui interface, then I pressed left arrow and checked that the
| status bar said "before item", then I hit \, typed list-restore-state,
| Enter, potato, enter.
|
| Regards
| Enrique