[NTG-context] Length range control of the last line of paragraph

Jan Tosovsky j.tosovsky at email.cz
Fri Mar 25 22:57:57 CET 2016


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

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

Jan




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