Re: orphans and widows in poems

[Hans Hagen <pragma@wxs.nl>]

On 6/17/2013 11:05 PM, Wolfgang Schuster wrote:
>
> Am 17.06.2013 um 19:18 schrieb Pablo Rodríguez <oinos@web.de>:
>
>> On 16/06/13 21:03, Wolfgang Schuster wrote:
>>> Am 16.06.2013 um 09:46 schrieb Pablo Rodríguez <oinos@web.de>:
>>>> [...]
>>>> Is there no way to avoid orphans and widows in the lines
>>>> environment?
>>>
>>> 1. Don’t use * in your setups names because names starting with an
>>> asterisk are system modes.
>>>
>>> 2. To load the defaults settings you have to use \setups[*reset]
>>> which needs the asterisks because it’s a system mode.
>>>
>>> 3.The settings doesn’t help because in the lines environment each
>>> line is a separate paragraph which makes \widowpenalty useless here.
>>
>> Thanks for your reply, Wolfgang.
>>
>> So, according to 3, there is no way to prevent widow or orphan lines in
>> a line environment, isn't it?
>
> Not with the current implementation of the environment because it doesn’t
> know how many lines are there. With a Lua based solution it would be simple
> to add a mechanism to prevent a page break at a certain region because
> the needed information are available.

yes, some of that is on the agenda (not to hard but as usual it take a 
bit of thinking / experimenting to get an interface)

basically it's a variant of \setpenalties (the plural \widowpenalties etc)

> \startluacode
>
> userdata              = userdata              or { }
> userdata.linescontent = userdata.linescontent or { }
>
> local linescontent = userdata.linescontent
>
> function linescontent.process()
> 	local lines = string.splitlines(buffers.getcontent("linescontent"))
> 	context.begingroup()
> 	for i=1,#lines do
> 		local l = lines[i]
> 		context("%s",l)
> 		context.par()
> 	end
> 	context.endgroup()
> end
>
> \stopluacode
>
> \def\startlinescontent
>    {\grabbufferdata[linescontent][startlinescontent][stoplinescontent]}
>
> \def\stoplinescontent
>    {\ctxlua{userdata.linescontent.process()}}
>
> \starttext
>
> \startlinescontent
> One
> Two
> Three
> Four
> Five
> Six
> \stoplinescontent
>
> \stoptext
>
> Wolfgang
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                                           Hans Hagen | PRAGMA ADE
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