March 2021 - ntg-context - NTG Mailing Lists

bug in lmtx
by Thomas A. Schmitz 10 Mar '21

10 Mar '21

Hi Hans, I've found a very interesting bug in lmtx. The following MWE gives the expected result in mkiv; in lmtx, one character is missing. Perhaps you can figure out what's happening... All best Thomas \setupbodyfont [gentium, 12pt] \starttext Test \hskip1em ἀβ Test \hskip1em ἁβ \stoptext

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SVG images inside XML setups
by Thangalin 09 Mar '21

09 Mar '21

Here's a fairly minimal example showing an issue, using ConTeXt LMTX. Save the following as "main.tex": % SOF \startbuffer[document] <body><img src="circle.svg"/></body> \stopbuffer \startbuffer[csvg] <svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"> <g><circle cx="50" cy="50" r="20"/></g> </svg> \stopbuffer \startxmlsetups xml:xhtml \xmlsetsetup{\xmldocument}{body|img}{xml:*} \stopxmlsetups \startxmlsetups xml:body \xmlflush{#1} \stopxmlsetups \startxmlsetups xml:img \placefigure{}{\externalfigure[\xmlatt{#1}{src}][conversion=mp]} \placefigure{}{\externalfigure[circle.svg][conversion=mp]} \placefigure{}{\includesvgbuffer[csvg][conversion=mp]} \stopxmlsetups \xmlregistersetup{xml:xhtml} \starttext \xmlprocessbuffer{xhtml}{document}{} \placefigure{}{\externalfigure[circle.svg][conversion=mp]} \placefigure{}{\externalfigure[diagram.svg][conversion=mp]} \stoptext % EOF Save the contents of "\startbuffer[csvg]" to a file named "circle.svg", to create a valid, external SVG file. Copy "circle.svg" to a file named "diagram.svg" to create a second valid, external SVG file. Run: context main.tex Expected All the SVG images appear. Actual Figures 1, 2, and 4 show only the following text: \includesvgfile[circle.svg]\resetbuffer[svg-circle-inclusion] In contrast, consider the following document: % SOF \startbuffer[csvg] <svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"> <g><circle cx="50" cy="50" r="20"/></g> </svg> \stopbuffer \starttext \placefigure{}{\includesvgbuffer[csvg][conversion=mp]} \placefigure{}{\externalfigure[circle.svg][conversion=mp]} \placefigure{}{\externalfigure[diagram.svg][conversion=mp]} \stoptext % EOF All the images appear as expected. Any idea why using XML setups appears to affect the behaviour of rendering SVG documents using MetaPost? Thank you!

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arbitrary context commands in xml file
by denis.maier＠ub.unibe.ch 08 Mar '21

08 Mar '21

Hi Is there a way to add arbitrary context commands to an xml file without defining an injector first? Best Denis

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--extra=select --once in LMTX
by Pablo Rodriguez 08 Mar '21

08 Mar '21

Dear list, I think there is a bug in LMTX with: context --extra=select --selection=15:30 a.pdf --once This gives 16 repetitions of page 30 (with any PDF document). If --once isn’t used or MkIV is deployed, selection is fine. Could anyone confirm the issue? Many thanks for your help, Pablo -- http://www.ousia.tk

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Log overful boxes
by denis.maier＠ub.unibe.ch 08 Mar '21

08 Mar '21

Hi, How can you add information about underfulor overful boxes to the log? Ideally both vboxes and hboxes. Best, Denis

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bug in \headnumber[section] in LMTX?
by Pablo Rodriguez 07 Mar '21

07 Mar '21

Dear list, I have the following sample: \starttext \section{Section} \currentheadnumber\\ \headnumbercontent\\ \headnumber[section] \stoptext In LMTX, \headnumber[section] triggers an error message about missing number. BTW, \currentheadnumber outputs 0 in both MkIV and LMTX. I think this may be a bug. Could anyone confirm both issues? Many thanks for your help, Pablo -- http://www.ousia.tk

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Write to tuc file
by denis.maier＠ub.unibe.ch 07 Mar '21

07 Mar '21

Hi, I want to split a PDF produced by context automatically at certain points. I was thinking I could add information about the desired breakpoints to the tuc file, but I don't know how you do this. Any hints? Best, Denis

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ConTeXt, KeenWrite, Markdown, and XHTML
by Thangalin 06 Mar '21

06 Mar '21

How would you convert the first class attribute of XHTML div elements to ConTeXt LMTX-specific start/stop environments? For example: <div class="poem dark"> <div class="stanza"> Whose woods these are I think I know. </div> <div class="stanza"> And miles to go before I sleep. </div> </dv> Becomes (the equivalent of?): \startpoem \startstanza Whose woods these are I think I know. \stopstanza \startstanza And miles to go before I sleep. \stopstanza \stoppoem In case this is an XY problem, background details follow. In a nutshell: convert a processed Markdown file that includes interpolated variables, arbitrary classes, and output from R functions into a format that ConTeXt can typeset. Background Details Pandoc's fenced div syntax is now supported by my text editor, allowing users to write "paragraph classes" in Markdown, such as: ::: {.poem .dark} ::: stanza Whose woods these are I think I know. ::: ::: This gets converted to XHTML (as shown above), which is to be rendered using ConTeXt LMTX. Rendering via ConTeXt needs the following tool chain: Editor (.md) -> run Pandoc (.tex) -> run ConTeXt (.pdf) Generating XHTML means Pandoc can be removed, simplifying the chain: Editor (.md -> magic -> .xhtml) -> run ConTeXt (.pdf) The Lua code to generate start/stop environments with Pandoc is described in Part 8 of my Typesetting Markdown series. https://dave.autonoma.ca/blog/2020/04/28/typesetting-markdown-part-8/#annot… The XML-MKIV documentation shows how to map a specific setup to a particular attribute: \xmlsetsetup{demo}{resource[@type='figure']}{xml:demo:figure} In Schmitz' XHTML-oriented My Way from 2010 there's a getmeas Lua function defined on page 9 that parses a width attribute. That's great for the opening div, but how would you close/stop the correct environment for nested divs? Would ConTeXt automatically track these on a stack, for example? Additional Ideas Given that the text editor converts Markdown to XHTML and has an XSLT engine, the following is possible: Editor (.md -> .xhtml) -> XSLT (.tex) -> run ConTeXt (.pdf) Piping XHTML directly into ConTeXt would be ideal, though. Well, piping CommonMark plus fenced div extensions to ConTeXt would be optimal, but my understanding is that support isn't quite there yet. Aditya wrote a Markdown filter that runs: pandoc -t context -o \externalfilteroutputfile\space \externalfilterinputfile This still needs Pandoc, though. There's also a dependency-free Markdown module. A few problems though. First, the module isn't ported to ConTeXt LMTX, yet? Second, it doesn't support element attributes beyond enabling content slicing. (Third, the module has LaTeX support tightly bundled within, which bloats a pure ConTeXt solution.) Related Links https://dl.contextgarden.net/myway/tas/xhtml.pdf https://www.pragma-ade.com/general/manuals/xml-mkiv.pdf https://github.com/DaveJarvis/keenwrite#screenshots https://github.com/adityam/filter/blob/master/README.md https://mirror.its.dal.ca/ctan/macros/generic/markdown/markdown.html#header… https://github.com/Witiko/markdown/

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conditional formatting, checking the context (SOLVED)
by Henning Hraban Ramm 06 Mar '21

06 Mar '21

Hi, in the example below I’m using a custom highlighting macro in titles. Now I don’t want this highlighting in the ToC or in bookmarks (in my real world example the changes affect bookmarks, not in the MWE). I know I can use the list= and bookmark= keys of \startchapter, but since the text is always the same for all, I’d like to check within the \SPECIAL macro if we’re within the chapter title or within a list or bookmarks. In preparing the MWE and this message I found a solution with the *chapter system mode. Wanted to share anyway ;) Hraban \define[1]\SPECIAL{\doifmodeelse{*chapter}{{\bf #1}}{#1}} \setupinteraction[state=start] \placebookmarks[chapter,title] \starttext \startchapter[title={This \SPECIAL{and} That}] \input knuth \stopchapter \startchapter[title={Something \SPECIAL{Other}}] \input tufte \stopchapter \completecontent[criterium=all] \stoptext

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Center a text (Metafun)
by Fabrice Couvreur 06 Mar '21

06 Mar '21

Hi Hans, Some time ago, you offered this code to respond to a specific request from me. I used this code again and wanted to know if it was possible for the title "Algorithm" to be automatically centered based on the content. Thank you Fabrice \definecolor[MyBlue][c=0.2 , m=0.03, y=0.00, k=0.00] \definecolor[maincolor] [b=.5] \defineframedtext [MyFrame] [frame=off, background=MyFrame, width=fit, height=fit, style=small] \startuseMPgraphic{MyFrame} path b; picture p; p := textext.rt("\tfx\bf\white\framedtextparameter{Title}"); p := p shifted (2BodyFontSize,OverlayHeight-ypart center p+.25ExHeight); b := boundingbox p leftenlarged .5EmWidth rightenlarged .5EmWidth topenlarged .5EmWidth bottomenlarged .5EmWidth ; fill OverlayBox withcolor "MyBlue" ; fill b withcolor \MPcolor{maincolor} ; draw p ; setbounds currentpicture to boundingbox currentpicture enlarged 2mm ; \stopuseMPgraphic \defineoverlay [MyFrame] [\useMPgraphic{MyFrame}] \starttext \MyFrame[Title=Algorithme]{% \m{a\gets 2x-1} \m{b\gets a²-1} \m{c\gets b\div 4} \m{d\gets c-a+x} } \stoptext

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