Re: MPinclusions, MPextensions, MPinitializations and MPinstances

[Hans Hagen <pragma@wxs.nl>]

On 2/14/2013 7:14 PM, Marco Patzer wrote:
> On 2013–02–14 Alan BRASLAU wrote:
>
>> So that extensions=yes|no and initializations=yes|no controls the use
>> of MPextensions and MPinitializations. It seems that extensions is
>> intended for all instances ("when enabled").
>>
>>  From what I can see, extensions are read "once", initializations "each",
>> and inclusions are intended for the "user". It appears that
>> initializations is used to pass dynamic things from ConTeXt to MP.
>
> This means we have two cases:
>
>    - read one single time (once)
>    - read one time per graphic (each)
>
> And another two cases:
>
>    - global to all instances (global)
>    - local to a particular instance (local)
>
> And we have four inclusion environments. I don't know how to map
> them to the cases listed above.
>
> - MPdefinitions     (local, ???)
> - MPinclusions      (global, ???)
> - MPinitializations (global, each)
> - MPextensions      (global, once)
>
> I don't understand the need of so many different environments. E.g.
> MPinclusions could be global unless an argument specifying the
> instance is provided.
>
>> It would be nice for someone who understands this all to explain it.
>
> +1
>
>> I still have not figured out how to specify MPinclusions for a
>> particular instance.

% initializations
%     to be used by context / modules
%     cummulative
%     things like page states, use by context itself
%     each instance (unless disabled, as not all instances need them)
%     each graphic

% definitions
%     can be used to add helpers and such
%     cummulative
%     per instance
%     just after a format is loaded

% extensions
%     cummulative
%     used for all instances
%     blocked per instance after first graphic % was: reset after first use

% fix for 'all' instances instead of first used instance:
%
% \def\meta_reset_current_preamble
%   {\ifconditional\c_meta_include_extensions
%      \global\letMPinstanceparameter\s!extensions\v!no
%      %global\t_meta_extensions\emptytoks
%    \fi}

% inclusions
%     user stuff
%     cummulative
%     used next instance/graphic
%     reset afterwards (always)
%     can be blocked per instance

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