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On Sunday, December 28th, 2025 at 8:00 PM, Wolfgang Schuster
<[email protected]> wrote:
>
>
> Am 28.12.2025 um 17:58 schrieb Aryeh Zapinsky:
> > Problem:
> > When using r2l alignment, layout of paragraphs appears to be flipped
> > (from r2l to l2r) after correctly placing the first paragraph inside of
> > a frame.
> >
> > Questions:
> > 1. What is going on? (I'm not sure how to describe what's happening.) Is
> > the paragraph not being formatted correctly or the frame?
> > 2. What document can I look at to understand what's happening to format
> > the text? typo-duc.lmt seems to be referencing some other work that has
> > sections and tagged rules. What document is that?
> > 3. What are typo-dir, typo-dha, and typo-duc each doing? I'm curious to
> > know so I can better navigate the codebase going forward.
>
>
> I can reproduce the problem with the following minimal example
>
> \defineparagraphs [Columns] [n=2,rule=on]
>
> \starttext
>
> \startframed[width=max,align=r2l]
> \startColumns 1 \nextColumns 2 \stopColumns
> \startColumns 1 \nextColumns 2 \stopColumns
> \stopframed
>
> \stoptext
>
>
> The reason why the first environment is r2l is because it start in
> horizontal mode while the second start in vertical mode, when you add
> \dontleavehmode before the second one it will also switch to r2l.
>
>
> One way to fix this problem is to add a direction key with will by
> default place the column "left to right" with the option to reverse it
> to "right to left".
>
It looks like \startparagraphs is internally using
\hpack without considering the layout directions,
maybe something like the following solve it?
\defineparagraphs [Columns] [n=2,rule=on]
\unprotect
\overloadmode=0
\overloaded\protected\def\startparagraphs[#1]% quite slow
{\bgroup % (1)
\cdef\currentparagraphs{#1}%
\edef\p_width{\paragraphsparameter\c!width}%
\ifempty\p_width
\d_typo_paragraphs_width\availablehsize
\else
\d_typo_paragraphs_width\p_width\relax
\fi
\d_typo_paragraphs_width{\d_typo_paragraphs_width-(\paragraphsparameter\c!offset)*2}%
\c_typo_paragraphs_max{\paragraphsparameter\c!n}%
\d_typo_paragraphs_auto\d_typo_paragraphs_width\relax
\scratchcounter\zerocount
\localcontrolledrepeat \c_typo_paragraphs_max
{\edef\p_width{\namedparagraphsparameter{\currentparagraphs:\the\currentloopiterator}\c!width}%
\ifempty\p_width
\advanceby\scratchcounter\plusone
\else
\advanceby\d_typo_paragraphs_auto-\p_width\relax
\fi
\ifnum\currentloopiterator>\plusone
\advanceby\d_typo_paragraphs_auto{-(\namedparagraphsparameter{\currentparagraphs:\number\currentloopiterator}\c!distance)}%
\fi}%
\ifnum\scratchcounter>\zerocount
\divideby\d_typo_paragraphs_auto\scratchcounter
\else
\d_typo_paragraphs_auto\zeropoint
\fi
\parindent\zeropoint
\c_typo_paragraphs_n\zerocount
\enforced\let\\\nextparagraphs % downward compatible
\setbox\scratchbox\hpack\c!direction\displaylefttoright % <---------- was
\setbox\scratchbox\hpack
\bgroup % (2)
\forgetall
\ifchkdimension\paragraphsparameter\c!offset\or\advanceby\hsize-2\lastchkdimension\fi
\let\typo_paragraphs_start_cell\typo_paragraphs_start_cell_indeed
\let\typo_paragraphs_stop_cell \typo_paragraphs_stop_cell_indeed
\typo_paragraphs_start_cell_indeed}
\protect
\starttext
\startframed[width=max,align=r2l]
\startColumns
Column one text here
\Columns
Column two text here
\stopColumns
\stopframed
\stoptext
Udi
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