December 2018 - ntg-context - NTG Mailing Lists

unknown file 'grph-img.lua'
by Henri Menke 18 Dec '18

18 Dec '18

Dear devs, In the latest beta building the format fails. resolvers > lua > unknown file 'grph-img.lua' This files seems to have been wrongfully removed. If I restore the file from the previous beta, everything works fine. Please fix! Cheers, Henri

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searching in nodes
by Hans van der Meer 17 Dec '18

17 Dec '18

In a Lua function called from within an \startxmlsetups..\stopxmlsetups code block I would like to search through the current node and all below. Using string.match("to-be-searched”,”pattern”). The Lua function being called through \def\findmypattern#1#2{\ctxlua{tex.print(hvdm.findmypattern("#1","#2",))} But I do not seem to get the node contents in the first argument #1. Using \xmlverbatim{#1} fails with Lua error "hexadecimal digit expected near '"\xm’”. \xmlflushpure{#1} fails with Lua error "invalid escape sequence near …” Any help? dr. Hans van der Meer

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Multiple image conversions
by Marco Patzer 16 Dec '18

16 Dec '18

Hi! I wonder if/how it's possible to specify multiple image conversions. Example: \startluacode local format = string.format local function degradejpg(oldname, newname) local s = format("gm convert -strip -quality 75%% -resize '300x300>' %s %s", oldname, newname) os.execute(s) end local function degradepng(oldname, newname) local s = format("gm convert -strip -resize '500x500>' %s %s", oldname, newname) os.execute(s) end figures.converters.jpg["degrade.jpg"] = degradejpg figures.converters.png["degrade.png"] = degradepng \stopluacode \setupexternalfigures [location=default, %% conversion=degrade.png, %% how to use both? conversion=degrade.jpg] \starttext \externalfigure [hacker] \externalfigure [mill] \stoptext I'd like to avoid specifying the filetype-specific conversion with each \externalfigure command: %% this works, but it clutters the document and one has to check the %% file type each time \externalfigure [mill] [conversion=degrade.png] Marco

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table cell minimum heights -- help needed
by Taco Hoekwater 16 Dec '18

16 Dec '18

Hi all, I am attempting to process html tables that are styled using css, and I have problem with the ‘height’ property. CSS (or rather, the html browser) interprets ‘height’ as if it was a “minheight”, and if the content does not fit, it will just enlarge the height until it does fit. Needless to say: I want that same functionality from the ConTeXt table I am using to generate the PDF and not end up with text crossing row boundaries. And I cannot figure out how to do it, as neither bTABLE’s \bTD nor xtable’s \startxcell interpret a “minheight" parameter. And whatever I put in “height” becomes the absolute value of the cell height. Did I miss something? I cannot imagine that this problem has not come up before… Best wishes, Taco Example code: \starttext \bTABLE[frame=on] \bTR \bTD[height=20pt] \input tufte \eTD \eTR \eTABLE \blank[10*line] \startxtable[frame=on] \startxrow \startxcell[height=20pt] \input tufte \stopxcell \stopxrow \stopxtable \stoptext

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unicode table in the fontloader
by Ulrike Fischer 14 Dec '18

14 Dec '18

Since 29.11 l-unicode.lua disables the slnunicode library with unicode = nil Functions from unicode.utf8 are used in various packages (latex and plain). They are documented in the luatex manual. Simply disabling them is not really an option for us. As we import l-unicode.lua through the lualibs package, this means that I currently have to revert the change manually. Would it be possible to disable the table only in context? Side question: are there any plans to remove the library from the binary? -- Ulrike Fischer https://www.troubleshooting-tex.de/

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indented headings possible?
by Taco Hoekwater 14 Dec '18

14 Dec '18

Hi again, Is there a way to make section headings automatically honour the current left- and rightskip? For example, like this: \starttext \showframe \startnarrower[left] \section{Section 1} stuff \stopnarrower \stoptext I know I could rig this up with \dontleavehmode\vbox{\advance\hsize-\leftskip\section{Section 1}}\par but that is horrible code. Is there any way to get the correct effect using \setuphead ? Best wishes, Taco

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graphics
by Hans Hagen 13 Dec '18

13 Dec '18

Hi, As most mechanism are reasonable okay now we can look into what future versions of ConteXt should provide in terms of functionality. The (luatex) engine is also more of less finished or at least stable in terms of functionality. One possible area of further development is graphics so I'd like to know if there are (reasonable) demands for more graphics support using metapost. Alan and I are on-and-off working on some extensions and one of the things we discuss is visualization of data. The question is of course what should be done in the lua/mp/tex combination and what externally but the combination has some advantages. There has been presentations and discussions at the last meeting and graphics is always a nice topic, and also kind of rewarding in terms of development. Of course other demands can be formulated too, but these then need to come with well defined descriptions (or mockup examples). Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------

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Drops Module
by Aditya Mahajan 13 Dec '18

13 Dec '18

Hi Peter, I noticed that the drops module recently stopping running with the error: /home/adityam/texmf/tex/context/third/drops/t-drops.lua:1098: bad argument #3 to 'format' (number has no integer representation) stack traceback: [C]: in function 'string.format' /home/adityam/texmf/tex/context/third/drops/t-drops.lua:1098: in upvalue 'get_IM_paths' /home/adityam/texmf/tex/context/third/drops/t-drops.lua:1380: in field 'shadow' [ctxlua]:1: in main chunk This is due to the change in Lua5.3 with respect to floating point numbers. The simplest solution is to change '%d' to '%.0f' at appropriate places. Thanks, Aditya

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\startnarrower
by Hans van der Meer 13 Dec '18

13 Dec '18

Is it possible to not indent the very first line of narrower content? Thus \startnarrower first line second line etc. \stopnarrower resulting in: first line second line etc. dr. Hans van der Meer

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\xmlfunction
by Hans van der Meer 12 Dec '18

12 Dec '18

How can one transmit argument values to \xmlfunction in order to be used by the Lua function called? dr. Hans van der Meer

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