Re: RTL section heads

[Hans Hagen <pragma@wxs.nl>]

On 4/11/2016 4:25 AM, Mohammad Hossein Bateni wrote:
> Hans & Wolfgang,
>
> Do you have suggestions here?  How can I get the behavior I want for the
> section head numbers?
>
> In fact, the following may be quite relevant.
>
> \usemodule[simplefonts]
> \setmainfont[ALM Fixed][features=arabic,range=arabic]
>
> \setupdirections[bidi=global,method=default]
> \setupalign[r2l]
>
> \starttext
>
> اعداد ۱، ۲، ۳ و ۴ را در نظر بگیرید.
>
> اعداد 1، 2، 3 و 4 را در نظر بگیرید.
>
> اعداد 1, 2, 3 و 4 را در نظر بگیرید.
>
> \stoptext
>
>
> I expect the numbers 1, 2, 3 and 4 to appear in the same order from
> right to left.  However, the visual order that I observe (regardless of
> whether I use Persian digits or English digits, or whether I use Persian
> or English commas) is 4, 1, 2, 3 (from left to right).  Is this a bug in
> the bidi code?  If so, are there any workarounds?

method=two

> Thanks,
> Hossein
>
> On Fri, Apr 8, 2016 at 5:20 PM, Mohammad Hossein Bateni
> <bateni@gmail.com <mailto:bateni@gmail.com>> wrote:
>
>     Hi,
>
>     This is concerning an RTL text.  I have one chapter and 10 sections
>     under that.  My goal is to achieve the following.
>     1) The number 10 should appear correctly with '1' visually to the
>     left of '0'.
>     2) The chapter number should visually appear to the right of the
>     section number.
>     3) Chapter and section numbers should be separated with a dash.
>       (This is ignored in this email and I will follow up about it in
>     another thread.  To get a minimal working example, I also do not try
>     to change the numbers to use Persian digits.)
>
>     In particular, the headings will be visually something like the
>     following (aligned to the right).
>     elpmas 1
>     txet 1-1
>     txet 2-1
>     txet 3-1
>     ...
>     txet 10-1
>
>     Here's the first attempt.
>
>     %% Attempt 1
>     \setupalign[r2l]
>
>     \starttext
>     \placecontent
>
>     \chapter{sample}
>     \dorecurse{10}{\section{text}}
>     \stoptext
>
>     The result is:
>     elpmas 1
>     txet 1-1
>     ...
>     txet 01-1
>
>
>     Then I add "\setupdirections[bidi=global,method=default]" to the
>     beginning and I get the most strange result (number right-aligned
>     but texts left-aligned):
>     sample                                    1
>     text                                       1.1
>     ...
>     text                                     1.10
>
>
>     A third attempt gives almost what I want (without period as the
>     separator).
>
>     %% Attempt 3
>     \setupalign[r2l]
>
>     \def\LTR#1{{\lefttoright#1}}
>     \def\leftnumbers#1{\LTR{\numbers{#1}}}
>     \defineconversion[leftnumbers][\leftnumbers]
>     \setuphead[chapter,title,section,subject] [conversion=leftnumbers]
>
>     \starttext
>     \placecontent
>
>     \chapter{sample}
>     \dorecurse{10}{\section{text}}
>     \stoptext
>
>
>     The big problem is that in my RTL documents, I always have the
>     setupdirections command, which messes things up here.  (This makes
>     it difficult to one section name with English title, which should
>     still be typeset on the right-hand side of the page.)  Note that in
>     attempt 2 above, there were two issues:
>     (1) Text and numbers appeared on the two far ends of the screen
>     instead of being close to each other.  This does not happen when I
>     use Farsi text.
>     (2) Chapter number appears to the left of section number.
>
>
>     %% Attempt 5
>     \usemodule[simplefonts]
>     \setmainfont[ALM Fixed][features=arabic,range=arabic]
>
>     \setupdirections[bidi=global,method=default]
>     \setupalign[r2l]
>
>     \starttext
>     \placecontent
>
>     \chapter{نمونه}
>     \dorecurse{10}{\section{متن}}
>     \stoptext
>
>
>     Interestingly the table of contents looks fine if I put the number
>     inside an LTR macro; still in the main body, the section heads are
>     typeset incorrectly.
>
>     %% Attempt 6
>     \usemodule[simplefonts]
>     \setmainfont[ALM Fixed][features=arabic,range=arabic]
>
>     \setupdirections[bidi=global,method=default]
>     \setupalign[r2l]
>
>     \def\LTR#1{{\lefttoright#1}}
>     \def\leftnumbers#1{\LTR{\numbers{#1}}}
>     \defineconversion[leftnumbers][\leftnumbers]
>     \setuphead[chapter,title,section,subject] [conversion=leftnumbers]
>
>     \starttext
>     \placecontent
>
>     \chapter{نمونه}
>     \dorecurse{10}{\section{متن}}
>     \stoptext
>
>
>     I guess the solution is to get the entire section head number string
>     (e.g., 1.10) to have RTL direction, however, each individual number
>     string inside (say, 1 or 10) should be written LTR.  How can this be
>     achieved?
>
>     The six TeX files (with corresponding PDF outputs) are attached.
>
>     BTW this is using ConTeXt ver: 2016.04.01 13:01 MKIV beta fmt:
>     2016.4.7 int: english/english, running LuaTeX, Version beta-0.90.0
>     (TeX Live 2016) on Mac OS X.
>
>     Thanks a lot,
>     —MHB
>
>


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