September 2024 - ntg-context - NTG Mailing Lists

Calling C code from ConTeXt LMTX
by Florent Michel 16 Sep '24

16 Sep '24

Hello, TL;DR: Could building LuaMetaTeX with the `-fPIC` flag for the Lua library have negative consequences? Is there a better way to be able to call external C functions from ConTeXt? I am working on a small project where it would be convenient to call functions written in C (possibly pre-compiled in a shared library) from ConTeXt. After looking at the Lua FFI, I found a way that seems to work (with ConTeXt LMTX 2024-08-16) but requires a small tweak to the cmake file used for building the Lua library. I would be grateful to have the opinion of people more knowledgeable than I am about whether this change could have negative consequences and whether there is a more straightforward way to call external C code. What I am trying to achieve is: * Compile some C code in a shared library (for instance, it may contain a numerical solver for some partial differential equation). * Have this code run when compiling a document with ConTeXt. (For instance, solving the differential equation with parameters defined in the .tex file and retrieving the results to plot a figure with MetaPost.) One easy way to do that is: * Write wrappers for the functions that will need to be called from ConTeXt using the Lua C API. * Compile the code and wrappers in a shared library and linking to the static lua library used by LuaMetaTeX (liblua.a on Linux). * In the .tex file, import the new library using, e.g., ``` \startluacode mylib = require("mylib") -- additional code using the C functions \stopluacode ``` * Run ConTeXt with the `--permitloadlib` flag. However, the second step requires (at least on Linux) liblua.a to be compiled with the `-fPIC` flag. I could do that by adding ``` set_property(TARGET lua PROPERTY POSITION_INDEPENDENT_CODE ON) ``` at line 47 in lua.cmake. Is there any known negative effect of doing that (apart from a possible small performance drop)? (Just to be clear, this is not a feature request; I'm just wondering whether doing it on my side is fine.) On a related note, is there a standard way to call external C functions (either in a shared library or in a .c file) from ConTeXt LMTX? The SwigLib library described in https://www.pragma-ade.nl/general/manuals/swiglib-mkiv.pdf looks very promising (and maybe could be a way to achieve what I'm trying to do in a much cleaner way), but I (maybe for lack of trying hard enough) have not been able to make it work with ConTeXt LMTX so far. Best regards, Florent

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Margins using 2UP imposition schema
by Angel M Alganza 16 Sep '24

16 Sep '24

Hello: I'm composing an A5 booklet printed on an A4 paper using the 2UP imposition schema. I believe, in such case, margins should be controlled using 'backspace' and 'cutspace' options of the \setuplayout command, but I'm afraid I don't quite understand how to use those properl. I want to make the 'external' margin (right on odd pages and left on even pages) as small as possible, and the 'internal' margin larger, so that I can hole punch the booklet. I believe, in such case, margins should be controlled using 'backspace' and 'cutspace' options of the \setuplayout command, but I'm afraid I don't quite understand how to use those properly. Here's a minimal example: \setuppapersize[A5][A4] \setuparranging[2UP,rotated] \setuplayout [topspace=13pt, backspace=30pt, cutspace=-20pt, width=fit, height=fit, header=0pt, footer=0pt] \setuppagenumbering[state=stop] \setupbodyfont[small] \starttext \dorecurse{20}{\input tufte \vskip 1em} \stoptext I wonder how I could reduce the left margin and increase the left one on the even pages. Any pointers, please? Thank you so much in advance. Ángel

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button
by Hans van der Meer 16 Sep '24

16 Sep '24

\button is defined to jump to a given reference. However, I would like to place a button that can execute a macro to be defined by myself. Thus for example pushing the button \executebutton{text}{macro} will execute that macro. Is this available somewhere in ConTeXT? If not, can it be provided in a future update? yours sincerely dr. Hans van der Meer

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Interline spacing in tabulate paragraphs
by Kirill Davidov 15 Sep '24

15 Sep '24

Greetings, Is there a way to set interline spacing in tabulate environments? The table's paragraphs do not seem to obey \setupinterlinespace like the rest of the text does. Code to toy with: \startdocument \setupinterlinespace[big] \input lorem \starttabulate[|k0r|k0xp|][EQ={---}] \NC Word \EQ definition; \NC\AR \NC Important word \EQ \input dijkstra \NC\AR \NC Importanter word \EQ not much else here. \NC\AR \stoptabulate \stopdocument

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Unexpected behaviour of apa-bibliography
by M U 14 Sep '24

14 Sep '24

I do not know anything about the apa-standard, so I do not know if my rendering follows the standard. The first appearance of the author in the bibliography is marked with year-b (1847b), the second with year-a (1847a). I expected the first to be marked with year-a and the second with year-b. Citing multiple references in one \cite[] only 2 out of 3 righttexts appear. When using \setupbtx[apa:cite][sorttype=none] all 3 righttexts appear but the characters after the year disappear. Is there a way to fix that behaviour? Thank you. Have a nice weekend. Matthias \startbuffer[bibliography] @book{spratt_Travels2_1847, title = {Travels}, volume = {2}, publisher = {Voorst}, author = {Spratt and Forbes}, year = {1847}, } @book{spratt_Travels1_1847, title = {Travels}, volume = {1}, publisher = {Voorst}, author = {Spratt and Forbes}, year = {1847}, } @book{test, title = {Title-Test}, publisher = {Publisher-Test}, author = {Author-Test}, year = {2000}, } \stopbuffer \definebtxdataset[asia] \usebtxdataset[asia][bibliography.buffer] \setupbtx[ dataset=asia, specification=apa, ] \usebtxdefinitions[apa] \setupbtxrendering[asia][ dataset=asia, sorttype=authoryear, ] % \setupbtx[apa:cite][sorttype=none] \starttext single citing:\\ \cite[righttext={{text 1: Vol. 1}}][spratt_Travels1_1847] \\ \cite[righttext={{text 2: Vol. 2}}][spratt_Travels2_1847]\\ \cite[righttext={{text 3: Test}}][test] multiple citing:\\ \cite[righttext={{text 1: Vol. 1},{text 2: Vol. 2},{text 3: Test}}][spratt_Travels1_1847,spratt_Travels2_1847,test] \blank[2*line] \placebtxrendering[asia][method=global] \stoptext

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(ConTeXt LMTX 2024, monospace font) Why does monospaced text go out of the margin for me? is this supposed to happen?
by Felix 14 Sep '24

14 Sep '24

https://pastebin.com/2ce1xSYf The code linked above has 3 paragraphs. One in TImes New Roman, the other in Aptos and the last in Aptos Mono. The paragraph with \tt seems to go over my margin of .5 inches for the left and right side of my doc., but the serif and sans serif text doesn't. I can't seem to figure out why exactly this is. Did I set up \setuplayout incorrectly? I wanted .5in margins but I kind of 'hacked' the way I got things. Is there a better way that I could have gotten .5 inch margins and a.5in header/footer? I can't seem to understand why the output is what it is. I would greatly appreciate any help! Feel free to switch out the fonts if you'd like

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ConTeXt LMTX 2024, \setupalign: Is the "Nicer justification and microtypography" list of options listed in ConTeXt Garden now obselete?
by Felix 14 Sep '24

14 Sep '24

When I try to use a combination (example = \setupalign[normal,extremestretch,verytolerant,hangingboth,fullhz,hyphenated,] ) and just normal I seem to be getting the same result when I try to load in a big paragraph. However, there is an obvious difference between me entering (just) flushleft, normal, flushright. Have those options become obsolete? how am I supposed to know? I use the latest version of LMTX

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Validation of pdf/A-2a
by Thomas Meyer 14 Sep '24

14 Sep '24

Hello, I would like to use pdf/A-2a for my documents and was wondering whether the documents will stand up to validation. I used veraPDF for the validation check. Unfortunately the a-variants (pdf/A1-a and pdf/A-2a) fail. Here the Validation Information: Validation information *Rule* *Status* Specification: ISO 19005-2:2011, Clause: 6.7.3.3, Test number: 1 <https://github.com/veraPDF/veraPDF-validation-profiles/wiki/PDFA-Parts-2-an…> The logical structure of the conforming file shall be described by a structure hierarchy rooted in the StructTreeRoot entry of the document's Catalog dictionary, as described in ISO 32000-1:2008, 14.7 **Failed** 1 occurrences Hide PDDocument StructTreeRoot_size == 1 root/document[0] StructTreeRoot entry is not present in the document catalog Specification: ISO 19005-2:2011, Clause: 6.7.2.2, Test number: 1 <https://github.com/veraPDF/veraPDF-validation-profiles/wiki/PDFA-Parts-2-an…> The document catalog dictionary shall include a MarkInfo dictionary containing an entry, Marked, whose value shall be true **Failed** 1 occurrences Hide CosDocument Marked == true root MarkInfo dictionary is not present in the document catalog, or Marked entry is set to false or is not present in the MarkInfo dictionary (MarkInfo = null, Marked = null) See the (shortened) minimal example taken from the wiki below. Does anyone have any experience or advice on how to make pdf/A-2a valid? Greetings Thomas \setupinteraction [title=TITLE, subtitle=SUBTITLE, author=AUTHOR, keyword={{KEYWORD1, KEYWORD2}, KEYWORD3}] %% For PDF/A \setupbackend[ format={pdf/a-2a}, %%%%validation fails %format={pdf/a-2b}, %%%%validation passed %format={pdf/a-2u}, %%%%validation passed %format={pdf/a-1b:2005}, %%%%validation passed %format={pdf/a-1a:2005), %%%%validation fails profile={default_cmyk.icc,default_rgb.icc,default_gray.icc}, intent=ISO coated v2 300\letterpercent\space (ECI)] \starttext \chapter[chap:testing]{Testing} \input knuth \input tufte \stoptext

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Indentation in headings
by Kirill Davidov 14 Sep '24

14 Sep '24

Greetings, As per Russian GOST standards, numbered section headings are flush left and start with the paragraph indent. Is there a proper way to indent a section heading? The code simulates what I want visually, but it unfortunately causes the heading to poke out into the margins. That can be troublesome if the title is long enough. Example code to tinker with: \setupindenting[yes, 2.5em, first] \setuphead[section][ style=\bf, align=flushleft, distance=1em, indentnext=yes, ] \showframe \startdocument \startsection[title=Foo] \input dijkstra \stopsection \startsection[title=Very long section title that makes you question the author's writing capabilities] \input dijkstra \stopsection \setuphead[section][ style=\bf, align=flushleft, distance=1em, indentnext=yes, before=\blank[2*big]\indentation, ] \startsection[title=Foo] \input dijkstra \stopsection \startsection[title=Very long section title that makes you question the author's writing capabilities] \input dijkstra \stopsection \stopdocument

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ConTeXt beginner, What should I enable within font features? And how do I see all the options possible?
by Felix 13 Sep '24

13 Sep '24

https://pastebin.com/245uwYj4 I have this setup for my fonts, called myfonts. I assume that `\definefontfeature [default] [default] [trep=yes,dlig=yes,itlc=yes]` will affect every single font that goes into my preamble (Forgive me if I seem incompetent, I am a beginner at ConTeXt) I have dlig and trep on so that works with single quotations like don't have a directional quote, and so that I get the Times New Roman ligatures via dlig and not just liga. itlc is enabled since I read some documentation and they sometimes mention enabling it is there some stuff like the extrafeatures option or anything that you would recommend i enable? might there be options for extrakerns that would be seen as something that one should enable? also, how can I see all the options available? dlig is something I discovered by accident that was not in the options list in the documentation. i use the latest version of ConTeXt LMTX on Windows

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