On 2014-06-23 Jan Tosovsky wrote:
> On 2014-04-23 Jan Tosovsky wrote:
> >
> > in my auto-generated two column index (registry) there are
> > several cases of widows - it is the last item of the given
> > letter which overflows to next column/page:
> >
> > --------------- (start page) -------
> > Usti 29 (! alone !)
> >
> > V
> > Vamberk 18
> > ...
> > ...
> >
> >
> > There are also few cases of orphans, but this is not so strange:
> > ...
> > ...
> > Josef 29
> >
> > K
> > Karel 69 (! alone !)
> > ---------------- (end page) ---------
> >
>
> I think both cases could be eliminated by establishing a new constraint
> to the 'key letter':
> (1) There must be 0 or at least 3 lines at the beginning of the
> page/column before the Key letter.
> (2) There must be at least 2 lines after the Key letter.
>
> Can this be somehow set in my source file?
>
I've found the corresponding code in strc-reg.mkiv:
\setvalue{\??registerindicator a}#1%
{\registerparameter\c!before
% bugged, why does leftskip gets set:
\vskip\lineheight\goodbreak\vskip-\lineheight
\begingroup
\useregisterstyleandcolor\c!style\c!color
\dontleavehmode
\strut
\iflocation
\dosetdirectpagereference{\currentregister:\v!section:#1}%
\fi
\registerparameter\c!command{#1}%
\endgroup
\blank[\v!samepage]%
\registerparameter\c!after
\par
\nobreak}
That (2) case can be fixed by a small change:
\testcolumn[3]\registerparameter\c!command{#1}%
But when tested on this MWE, you can see a drawback - the first letter (p)
starts always on the second line (not on the first one):
\setupregister[balance=yes]
\starttext
\index{primary+secondary+tertiary}
\index[primary long]{\dorecurse{5}{primary long }}
\index[primary longer]{\dorecurse{5}{primary longer }}
\input{tufte}
\completeindex
\stoptext
Can this issue somehow be eliminated? Tested on the last beta (with my
patch).
That (1) case is still open. I have no idea how to accomplish something like
this using (Con)TeX(t) syntax :-(
Thanks, Jan
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