Re: changing alignment inside a paragraph

[mf <massifr@fastwebnet.it>]

Il 11/12/19 21:25, Wolfgang Schuster ha scritto:
> \starttext
> 
> \startbuffer
> This is the text of an index term, that is normally justified,
> but I'd like the page numbers to be flushed to the right from
> their second line\par
> \startalignment[flushright]
> \ifdim\dimexpr\hsize-\lastlinewidth\relax>2\emwidth
>      \blank[overlay]
> %   simple solution but doesn't indent the numbers on the following lines
> %   \hskip\dimexpr\lastlinewidth+\emwidth\relax
>      \parshape 2
>          \dimexpr\lastlinewidth+\emwidth\relax 
> \dimexpr\hsize-\lastlinewidth-\emwidth\relax
>          \emwidth \dimexpr\hsize-\emwidth\relax
> \else
>      \parshape 1 \emwidth \dimexpr\hsize-\emwidth\relax
> \fi
> 34, 57, 101-104, 276, 345, 401, 403, 512.
> \stopalignment
> \stopbuffer
> 
> \dorecurse
>    {10}
>    {\hsize\dimexpr.75\textwidth-#1\emwidth\relax
>     \getbuffer
>     \page}
> 
> \stoptext
> 

Thanks Wolfgang.

I wrote a better version. I still have a couple of questions.
In the lines:

\iffirstargument
   \getparameters[PIT!][test=off,margin=1em,distance=1em,minwidth=1em,#1]
\else
   \getparameters[PIT!][test=off,margin=1em,distance=1em,minwidth=1em,]
\fi

i would avoid writing the default values twice; i tried something like:

\getparameters[PIT!][test=off,margin=1em,distance=1em,minwidth=1em,\iffirstargument#1\fi]

but it doesn't work.

For the second question, see the first item of page 3: i think the 
\lastlinewidth fails because there's a page break. From supp-box.lua:

implement {
     name    = "lastlinewidth",
     actions = function()
         local head = tex.lists.page_head
         -- list dimensions returns 3 value but we take the first
         context(head and 
getdimensions(getlist(find_tail(tonut(tex.lists.page_head)))) or 0)
     end
}

I think that's because page_head is reset in the page break.
Is there a way to prevent that?

Massi

--------------------------------------------------------------
\unprotect
\def\PlaceIndexTerm{\dosingleempty\doPlaceIndexTerm}
\def\doPlaceIndexTerm[#1]#2#3{%
\iffirstargument
   \getparameters[PIT!][test=off,margin=1em,distance=1em,minwidth=1em,#1]
\else
   \getparameters[PIT!][test=off,margin=1em,distance=1em,minwidth=1em,]
\fi
#2\par
\startalignment[flushright,stretch]
\ifdim\dimexpr\hsize-\lastlinewidth\relax > 
\dimexpr\PIT!distance+\PIT!minwidth\relax
   \blank[overlay]
   \parshape 2
   \dimexpr\lastlinewidth+\PIT!distance\relax 
\dimexpr\hsize-\lastlinewidth-\PIT!distance\relax
   \PIT!margin \dimexpr\hsize-\PIT!margin\relax \doif{\PIT!test}{on}{\red}
\else
   \page[no]
   \parshape 1 \PIT!margin \dimexpr\hsize-\PIT!margin\relax 
\doif{\PIT!test}{on}{\darkgreen}
\fi
#3\par
\stopalignment}
\protect

\setupalign[stretch]

\starttext

\def\Text{This is the text of an index term, that is normally justified,
but I'd like the page numbers to be flushed to the right from
their second line}

\def\Pages{34, 57, 101-104, 276, 345, 401, 403, 512.}

\type{\PlaceIndexTerm[margin=1em,distance=1em,minwidth=1em]{text}{pages}}
\startitemize
\item margin:
       the left margin of the lines made only of page numbers
\item distance:
       the distance of the first page number from the last word of the text
\item minwidth:
       the shortest acceptable space at the end of the text to try to 
start page numbers there
\stopitemize

\page

\dorecurse
   {23}
   {\hsize=\dimexpr5cm+#1\emwidth\relax
    #1: \the\hsize\par
    \PlaceIndexTerm[test=on]{\Text}{\Pages}}

\stoptext
--------------------------------------------------------------
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