Re: Length range control of the last line of paragraph

[Hans Hagen <pragma@wxs.nl>]

On 3/25/2016 10:57 PM, Jan Tosovsky wrote:
> On 2016-03-25 Hans Hagen wrote:
>> On 3/25/2016 2:40 PM, Jan Tosovsky wrote:
>>> On 2016-03-24 Hans Hagen wrote:
>>>> On 3/24/2016 8:36 PM, Jan Tosovsky wrote:
>>>>>
>>>>> We basically need:
>>>>> <text><glue min-width='XX' max-width='hsize-3*indent'>
>>>>>
>>>>> and I thought this is exactly what \parfillskip ensures
>>>>> \parfillskip XX plus (hsize - 3*indent)
>>>>>
>>>>
>>>> the fil is taken into account when calculating the best break
>>>> points and then the XX is fixed but plus/minus can lead to if
>>>> being less or more, all relative to other fill (distributed)
>>>>
>>>> so, XX plus (hsize - 3*indent) is not a fixed value, it's XX or
>>>> more
>>>>
>>>> take this:
>>>>
>>>> \ruledhbox to 10cm {x\hskip0pt plus 1cm x}
>>>>
>>>> the skip will stretch more than 1cm
>>>
>>> I can see.
>>>
>>> But sorry for my ignorance, as far as I understand, \parfillskip
>>> is added to the end of the paragraph, so we have rather
>>> \ruledhbox to 10cm {x\hskip0pt plus 1cm} % without that 'x' at the
>>> end, so no 'glue' distribution is performed
>>
>> there is but not enough stretch so there will be a warning ... you
>> can see it from
>>
>> \ruledhbox to 10cm {x}
>> \ruledhbox to 10cm {x\hskip0pt plus 1cm}
>> \ruledhbox to 10cm {x\hskip0pt plus 1fill}
>>
>
> I get it, thanks.
>
>>> If '\parfillskip 2em plus (hsize - 3*(2em) - 2em)' is specified, I
>>> still think we should get space of width at least 2em '####' which
>>> can be extended as indicated by hyphens '-' here:
>>>
>>> emememememememememememememememememememem
>>> emememememem------------------------####
>>>
>>> So there are two last line lengths extrems:
>>> (shortest)
>>> emememememememememememememememememememem
>>> emememememem
>>>
>>> (longest)
>>> emememememememememememememememememememem
>>> emememememememememememememememememem
>>
>> you always add a 2em skip so there will never be a word touching the
>> right margin in the last line;
>
> yes, but this is my goal (!)
>
> See https://mailman.ntg.nl/pipermail/ntg-context/2016/084858.html - case (2)
>
> I am afraid I hasn't been clear enough yet.
>
>
>>> Can I somehow define command globally which takes local block widths?
>>>
>>> \parfillskip #1 plus \localhsize-#1-#2, where
>>> #1 gap width
>>> #2 shortest line width
>>
>> \availablehsize
>>
>
>
> So the following \parfillskip specification finally seems to be what I was looking for as it covers both cases in my original question:
>
> \setupindenting[yes,2em]
>
> \newdimen\lastlineminlength
> \newdimen\lastlinemingap
>
> \lastlineminlength=3em
> \lastlinemingap=1em
>
> \parfillskip \lastlinemingap plus \dimexpr\availablehsize-\lastlineminlength-\lastlinemingap\relax
>
> \edef\ward{\cldloadfile{ward}}
>
> \starttext
>
> \dorecurse{100}{
>       \hsize\dimexpr\textwidth-#1mm\relax
>       \ward  \par
>       \ward  \par
>       \startnarrower[left]
>           \ward \par
>           \ward \par
>       \stopnarrower
>       \page
> }
>
> \stoptext

try \ward{}okay i.e. a short word at the end and you'll see theh

\parfillskip \lastlinemingap plus 1fill

works just as well

> As it can be done in one place globally and in almost single line, no special new command is necessary (as requested originally).

i've removed the one|two|three and added final|2*final|3*final|4*final

where final is a hspace of one em by default

the only purpose of this feature is to ensure a gap at the end (handy 
when there is no indentation)

for your case i see no solution apart from heuristic lua magic

Hans


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                                           Hans Hagen | PRAGMA ADE
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