Re: Conditional keep-with-next rules

[Hans Hagen <pragma@wxs.nl>]

On 6/28/2014 8:19 AM, Jan Tosovsky wrote:
> On 2014-06-27 Jan Tosovsky wrote:
>> Dear All,
>>
>> in my index I can see disturbing page breaks.
>>
>> primary-01
>> primary-02
>>     secondary-01
>> ------- ( next page ) -----
>>     secondary-02
>> primary-03
>>
>> instead of
>>
>> primary-01
>> ------- ( next page ) -----
>> primary-02
>>     secondary-01
>>     secondary-02
>> primary-03
>>
>> Is it possible to somehow define conditional keep-with-next rules?
>>
>> I'd like to express:
>> (1) keep always the primary with the first secondary (this seems to be
>> implemented)
>> (2) keep always the first secondary with the next secondary
>> (3) keep always the last secondary with the previous secondary
>>
>> And similarly for tertiary.

Deep down we have (spac-ver) this:

\definevspacing[preference][penalty:-500]  % goodbreak
\definevspacing[samepage]  [penalty:10000] % nobreak
\definevspacing[max]       [category:1]
\definevspacing[force]     [category:2]
\definevspacing[disable]   [category:5]
\definevspacing[nowhite]   [category:6]
\definevspacing[back]      [category:7]
%               together   [category:8]
\definevspacing[overlay]   [category:9]
\definevspacing[always]    [category:0]
\definevspacing[weak]      [order:0]
\definevspacing[strong]    [order:100]

so we can have weights and so. However, in practice the problem is that 
when combining different mechanisms their spacing settings might not be 
tuned to each other. I will extend this mechanism when we have a bit 
more control over some of the lists involved.

It's no big deal to set up something for an index, but it needs thinking 
about how to deal with worst case scenarios and these will happen for 
sure and you don't want to end up with a sequence of entries two pages 
height running of a page, certainly not in a fully automated workflow.

It is on the to-be-loked-into-list, but as all things, it has to fit 
into my agenda (read: to be done in what's left of my free time). I also 
have to make sure then it does not mess up existing files.

For the moment playing with the before/after keys is the way to go.

Hans

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                                           Hans Hagen | PRAGMA ADE
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