Re: letter: backaddress

["Wolfgang Werners-Lucchini" <wwl@musensturm.de>]

Hallo,

> \setupletterstyle[backaddress=yes]
> 
> it's a disabled by default but i forgot to do this also in the
> default style
> (most styles reset the layout and use default values before they
> modify it)
> > \setupletterstyle
> >    [backaddress]
> >    [alternative=auto,
> >    
> 'auto' is now the default value
> 
> Wolfgang

I do not understand the the main principle.

What is the difference between

\setupletterstyle[option][backaddress=yes]

and

\setupletterstyle[backaddress][alternative=yes]
	
In 'default.nli' I found

\defineletterelement[\v!backaddress][\v!auto]
  {\doifelselettervalue\c!backaddress
     {\lettervalue\c!backaddress}
     {\lettervalue\c!fromname
      \doiflettervalue\c!fromaddress\\
      \lettervalue\c!fromaddress}}

what I interpret in the following way:

If 'backaddress'=auto
  If exist a constant 'backaddress'
    use it
  else
    compose one from 'fromname' and 'fromaddress'

To use this, I tried to set 

\setupletterstyle[option][backaddress=auto]

or

\setupletterstyle[backaddress][alternative=auto]

And I tried to set this constant backaddress, with

setlettervalue{backaddress}{something}

But no combination is working.

What worked is

\setupletterstyle[option][backaddress=yes]
\setlettervalue{backaddress}{something}

which should not work, because

\defineletterelement[\v!backaddress][\v!yes]
  {\lettervalue\c!fromname
   \doiflettervalue\c!fromaddress\\
   \lettervalue\c!fromaddress}

is composing the 'backaddress' from the fromdata.

My skills to read the sourcecode are very limited, so most likely I 
buhave something misunderstood.

Wolfgang
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