On 2014-08-14 00:26, Wolfgang Schuster wrote:
>
> Am 13.08.2014 um 20:56 schrieb Rik Kabel <context@rik.users.panix.com 
> <mailto:context@rik.users.panix.com>>:
>
>> Dear list,
>>
>> In a number of notes (recent and in the list archive) I have seen 
>> \resetsetups, used (always) as in a block of code like this from 
>> Gerben Wierde:
>>
>>     \startsetups chapter:before
>>        \page[left]
>>        \noheaderandfooterlines
>>        \startalignment[left,nothyphenated]
>>     	\startnarrower[4*left]
>>     	    \em \getbuffer[chapter:quote]
>>     	\stopnarrower
>>        \stopalignment
>>        \resetsetups[quote:text]
>>        \page[right]
>>        \noheaderandfooterlines
>>        \blank[force,2*big]
>>     \stopsetups
>>
>>
>> What is the purpose of \resetsetups in this code? I see no different 
>> result without it, and all I can determine from list and document 
>> searches is that this is a vestigal command from x-fo processing.
>
> With the \resetsetups command you can remove a previously created 
> setups environment. As you can see from the following example 
> “mysetups” doesn’t exist anymore after the \resetsetups command.
>
> \startsetups[mysetups]
>   Dummy text.
> \stopsetups
>
> \starttext
>
> \doifsetupselse{mysetups}{YES}{NO}
>
> \resetsetups[mysetups]
>
> \doifsetupselse{mysetups}{YES}{NO}
>
> \stoptext
>
> Wolfgang
>
Thank you again, Wolfgang.

I notice that, while the _contents_ of the setup are removed, and using 
the reset setup introduces nothing into the text, there is no error or 
warning generated. (This is also the case, I learned, with an undefined 
buffer.) I can see that this can be very useful in a number of situations.

Can \resetsetups reset more than one setup in a single execution? When I 
try \resetsetups[setupA,setupB] it appears to reset neither. I only ask 
because of the plural name. It does not appear to be a burden to use 
multiple \resetsetups commands.

Are there equivalent commands to \resetsetups and \doifsetupelse for 
buffers? I could find nothing obvious.

The following example shows what I mean by the above statements. My 
examples are often clearer than my descriptions.

    \starttext

    \subject{test 1}

    \startsetups[mysetups]
       YES
    \stopsetups

    1. \doifsetupselse{mysetups}{\setup[mysetups]}{NO}

    \resetsetups[mysetups]

    2. \doifsetupselse{mysetups}{\setup[mysetups]}{NO}

    \startsetups[mysetups]
       yes
    \stopsetups

    3. \doifsetupselse{mysetups}{\setup[mysetups]}{NO}

    \subject{test 2}

    \startsetups[mysetups]
       YES
       \resetsetups[mysetups]
    \stopsetups

    1. \doifsetupselse{mysetups}{\setup[mysetups]}{NO}

    2. \doifsetupselse{mysetups}{\setup[mysetups]}{NO}

    \startsetups[mysetups]
       yes
       \resetsetups[mysetups]
    \stopsetups

    3. \doifsetupselse{mysetups}{\setup[mysetups]}{NO}

    \subject{test 3}

    \startsetups[mysetups]
       YES
    \stopsetups

    1. ¦\setup[mysetups]¦

       \resetsetups[mysetups]

    2. ¦\setup[mysetups]¦

    \startsetups[mysetups]
       yes
    \stopsetups

    3. ¦\setup[mysetups]¦

    \subject{test 4}

    \startsetups[mysetups]
       YES
       \resetsetups[mysetups]
    \stopsetups

    1. ¦\setup[mysetups]¦

    2. ¦\setup[mysetups]¦

    \startsetups[mysetups]
       yes
       \resetsetups[mysetups]
    \stopsetups

    3. ¦\setup[mysetups]¦

    \subject{test 5}

    1. ¦\setup[neverdefined]¦

    2.  ¦\getbuffer[neverdefined]¦

    \subject{test 6}

    \startsetups[mysetupstwo]
       , SIR!
    \stopsetups

    \startsetups[mysetups]
       YES
    \stopsetups

    1. ¦\setup[mysetups]\setup[mysetupstwo]¦

       \resetsetups[mysetups,mysetupstwo]

    2. ¦\setup[mysetups]\setup[mysetupstwo]¦

    \stoptext

-- 
Rik Kabel