April 2025 - ntg-context - NTG Mailing Lists

Tagging Math
by Matthias Weber 25 Apr '25

25 Apr '25

Dear All, Following the instructions in tagging.pdf, I tried \setupbackend[format=pdf/ua-2] \setuptagging[state=start] \enabledirectives [backend.usetags=crap] \registermathsymbol[default][en][ z ][the variable] \registermathsymbol[default][en][ k ][the index] \starttext \startformula \startalign \NC \left|(z_0+h)^n - z_0^n\right| \NC = \left|\sum_{k=1}^n \binom{n}{k}h^k z_0^{n-k}\right| \NR \NC \NC = \left |h \sum_{k=0}^{n-1} \binom{n}{k+1} h^k z_0^{n-1-k}\right| \NR \NC \NC = \left|h \sum_{k=0}^{n-1} \frac n {k+1} \binom{n-1}{k} h^k z_0^{n-1-k}\right| \NR \NC \NC \le n | h| \sum_{k=0}^{n-1} \binom{n-1}{k} |h|^k |z_0|^{n-1-k} \NR \NC \NC \le n | h| (|z_0|+|h|)^{n-1} \NR \stopalign \stopformula \stoptext This creates within the pdf the XML attachment below: This XML contains all the information from the formula. Wrapping it into \usemodule[mathml] \starttext \xmlprocessdata{}{ % content of XML file }{} \stoptext produces which is also what my Mac screen reads from the original PDF, but it is evidently not what I want. Does someone have a working example that shows how to do this right? Thanks, Matthias

6 19

*Not* starting a section at the very bottom of a page
by Jim 25 Apr '25

25 Apr '25

This could be a bug report, but it is mostly a request for assistance. In https://www.pragma-ade.com/general/manuals/mathincontext-screen.pdf I see "2.11 Big operators" is at the very bottom of a page (no "content" of section 2.11 is on that page). This is an example of what I don't want, and anyone who feels the same way would consider this a (very minor) bug report for the (otherwise most excellent) math manual. For plain TeX, I have been using a macro I wrote called \need, so that a usage like \need 2cm would end the current page before omitting any more material, if there is less than 2cm left on the current page. I then used this in chapter and section macros (and anywhere else I felt like). I have played around a little bit with converting that macro for ConTeXt, but I'm not as confident that it Does The Right Thing in ConTeXt as for plain TeX. Q: is there a ConTeXt macro which does a \page if there is less space on the current page than specified by the argument to the macro? Thanks. Jim

4 5

Bug report about \definefallbackfamily and other questions
by Sylvain Hubert 24 Apr '25

24 Apr '25

Hello, 1 bug report + 3 questions: ___ # Bug report: \definefallbackfamily ignoring font features ```tex \definefallbackfamily[mainface][rm][Noto Serif][preset=range:greek, sl={style:tf, features:slanted}] \definefontfamily[mainface][rm][latinmodernroman] \setupbodyfont[mainface] \starttext \sl something αβγ \stoptext ``` The three greek letters are slanted when compiled with older ConTeXt LMTX (before Oct.19, 2024), but they remain upright under the latest version. ___ # Question: ad-hoc font features I tried to specify ad-hoc font features (see below) in `\definefontfamily` like slant+bold, without naming the feature with `\definefontfeature` since they're not supposed to be reused. But the resulting fonts are always thicker than expected. Then I found that, even with empty effects, `features:{effect={}}` itself makes the font ultra bold. ```tex \definefontfamily[mainface][rm][Noto Serif][sl={style:tf, features:{effect={}}}] \setupbodyfont[mainface] \starttext \sl something αβγ \stoptext ``` Is this a bug, or is there any justification behind it? ___ # Question: feature inheritance of `\definefontfamily` When I customize fonts with \definefontfamily, e.g: ```tex % some other customization with \definefallbackfamily ... \definefontfamily[mainface][rm][latinmodernroman] \definefontfamily[mainface][tt][latinmodernmono] \setupbodyfont[mainface] \starttext \tt\sl something \stoptext ``` the slanted monospace becomes some kind of italic. To recover the default behavior, the slant variant must be explicitly specified: ```tex % some other customization with \definefallbackfamily ... \definefontfamily[mainface][rm][latinmodernroman] \definefontfamily[mainface][tt][latinmodernmono][sl=lmmonoslant10regular] \setupbodyfont[mainface] \starttext \tt\sl something \stoptext ``` But it's unproductive to copy-paste full specification (slanted, bold, ...) of the builtin latin modern. Is there any way to avoid this by somehow inheriting the default specification? ___ # Question: ConTeXt LMTX version control Where can one find older releases of ConTeXt LMTX when encountering problems like the bug above? https://github.com/contextgarden/context looks promising, but it doesn't provide release artifacts, nor build instructions. I could help add a workflow for automated release to it if someone kindly provides a built instruction. ___ Best regards, Sylvain

4 10

Rotating and scaling images to fit a page
by Michael Guravage 24 Apr '25

24 Apr '25

Greetings, I have many images, all with different aspect ratios, that I would like to collect in a document. Each image should be rotated and scaled to fit its page. My MWE uses an image's width and height to discern whether it's wide, tall, or square. This works, but I feel I'm reinventing the wheel. Is there a more straightforward way to implement this? Any suggestions would be much appreciated. -- With kind regards, Michael Guravage \showgrid \setuplayout [header=0pt, footer=0pt, topspace=0pt, bottomspace=0pt, height=middle, width=middle, backspace=0pt] \starttext \startluacode require "lfs" function GetFileExtension(url) return url:match("^.+(%..+)$") end cwd=lfs.currentdir() for file in lfs.dir(cwd) do suffix = GetFileExtension(file) if suffix == ".png" then image = figures.getinfo(file).used width = image.width or 0 height = image.height or 0 aspect = height/width if (aspect > 0.9 and aspect < 1.1 ) then context.externalfigure({file},{width="\\textwidth"}) -- almost square elseif height < width then context.externalfigure({file},{width="\\textheight", orientation=90}) -- landscape else context.externalfigure({file},{height="\\textheight"}) -- portrait end context.page() end end \stopluacode \stoptext

2 1

Optional delimited arguments with key-value sets?
by G.C.H.M. Verhaag 24 Apr '25

24 Apr '25

Hi ConTeXt users, I'm trying to build a user-defined command called *mycommand* and followed the hints on (https://wiki.contextgarden.net/ConTeXt_and_Lua_programming/Tutorials/System…) \def\dodefinemycommand[#1][#2]% {\getparameters[\??xx#1][#2]} \def\mycommand% {\dodoubleargumentwithset\dodefinemycommand\strut\blank[2*big] See what happens: \@@xxonex} and call it with: *\mycommand[one,two][x=1,y=2]* ** This yields a fatal error; while I'd expect something like: *See what happens: 1* What am I doing wrong here? ** ** Gerard P.S. Currently using version: 2023.02.14 17:44!

3 2

Aligning sub- and superscripts
by Florent Michel 24 Apr '25

24 Apr '25

Hi, I was going through the ‘Mathematics/Mathematical glyphs’ section of the wiki. Unless I am missing something, the first method proposed in the section ‘Subscript and superscript’ ( https://wiki.contextgarden.net/Mathematics/Mathematical_glyphs#Subscript_an…) to align sub- and superscripts does not seem to align them with ConTeXt 2025.04.01. The following example: \starttext $T^a_b^c$ $T^a{}_b{}^c{}$ \stoptext produces (unless my eyes are deceiving me) twice the same output, with the subscript b below a. One possible workaround is to add 0-width spaces after indices (I just added this workaround to the wiki so that it shows one working option). This seems a bit of a hack, though (and not the easiest to type with most keyboards), and the results are not perfect (the space between the a and c looks a bit too wide to me; although that is probably subjective, and can be resolved by manually adding \kern s). Would anyone know if there is a better (easier to type and/or producing a better result without having to manually add negative \kern s) solution? Cheers, Florent

3 4

read out of \tx-value possible?
by Thomas Meyer 22 Apr '25

22 Apr '25

Hi folks, is it possible to read out the value of \tx (or \txx ... ) for calculations if bodyfont and fontsize is given? \the\tx doesn't work. \setuplayout[grid=yes] \setupbodyfont[libertinus,12pt] \setupinterlinespace[1.25\bodyfontsize] \starttext \samplefile{tufte}\par \startlinecorrection \setuplocalinterlinespace[12.5pt] \placefigure [middle,nonumber]{\tx\midaligned{bla blablabla blabla\\ blubdibla blabla bla}} {\externalfigure[][height=40mm, width=60mm]} \stoplinecorrection \samplefile{tufte}\par \stoptext I would like to calculate the setuplocalinterlinespace similar to the setupinterlinespace. Thanks in advance Thomas

3 4

Why is this code not creating "Ibid" style entries?
by Joel 18 Apr '25

18 Apr '25

I created this simple macro, for citing papers. Basically just use this format: \turabian{bibtextkey}{page range} or \turabian{smith1980}{10-23} ...and it places a citation. Now, one feature I needed was if the bibtextkey ever repeated, it should instead display "Ibid. p. 10-23" So if I have text like this... This is a passage about some trees. The trees were tall. \turabian{smith1980}{2-30} The trees were also really green.\turabian{smith1980}{40-44} ...the second citation just displays the "Ibid., p. 40-44". I did this by at the end of the macro, setting \setvalue{previousmymacro}{#1}, then checking if that value is the same the next time hte macro is called. So its just checking, if #1 is same as last time the macro was called, then use Ibid. Something though isn't working as expected. Why isn't this displaying Ibid. when it should for repeated bibtextkeys? --Joel Code: \let\previousmymacro\empty \define[2]\turabian{% \iftok{#1}{\getvalue{previousmymacro}}% \doifemptyelse{#2}{% \footnote{Ibid.}\nocite[#1]% }{% \footnote{Ibid., #2.}\nocite[#1]% }% \else% \doifemptyelse{#2}{% \cite[#1]% }{% \cite[loctext={#2}][#1]% }% \fi% \setvalue{previousmymacro}{#1}% }%

2 1

Re: ask for help on balancing columnset
by wangzhongtian 18 Apr '25

18 Apr '25

1 0

ask for help on balancing columnset
by wangzhongtian 17 Apr '25

17 Apr '25

3 2