ntg-context August 2022

ntg-context@ntg.nl

44 participants
80 discussions

Re: [NTG-context] Accessing inserts from Lua in LuaMetaTeX
by Max Chernoff 16 Aug '22

16 Aug '22

Hi Hans, > > First, how do I get an insert's class/type from the "insert" nodes on > > the page? With LuaTeX, the insert's class/type is the same as the > > subtype of the "ins" nodes, but the subtype of the "insert" nodes is > > always zero in LuaMetaTeX, so I'm not sure how to get the class/type. After playing around, I found that this is stored in "<insert node>.index". I'm able to write to this value just fine, but whenever I read it I get an error. This minimal example: \starttext \setbox999=\vbox{\hrule width 10pt height 10pt} \startluacode local insert = node.new("insert") local rule = tex.box[999].list insert.list = rule insert.index = 4 node.write(insert) \stopluacode \stoptext works perfectly, but this example: \startluacode local insert = node.new "insert" insert.index = 4 print(insert.index) \stopluacode gives this error message: In \insertmode 2 you can't use zero as index. I suspect that this is a bug, but I may just be doing something wrong. > Indeed, we don't use these boxes and registers because we run in > \insertmode=2. This gives us more state info (i kept the old method > around for now). Inserts always felt a little hacky in TeX, so I think that the new methods are a huge improvement. > > Second, how do I get the head of the insert box from Lua? With LuaTeX, > > from TeX you would use "\box<class>" and from Lua you can use > > "tex.box[<class>]". With LuaMetaTeX, you use "\insertbox<class>" from > > TeX, but I'm not sure how to get at the insert box from Lua. > > tex.getinsertdistance > tex.getinsertmultiplier > tex.getinsertlimit > tex.getinsertheight > tex.getinsertdepth > tex.getinsertwidth > tex.getinsertcontent > tex.setinsertdistance > tex.setinsertmultiplier > tex.setinsertlimit > tex.setinsertcontent Perfect! "tex.getinsertcontent" does exactly what I need. Really minor, but I would expect that tex.insertcontent[4] = <some node> <some node> = tex.insertcontent[4] would be exist and be equivalent to <some node> = tex.getinsertcontent(4) tex.setinsertcontent(4, <some node>) > The insert (etc) handler is more clever and flexible. So, for instance > we can bubble up inserts. I think you do a preroll so in that case you > can set the migrations related parameter to not bubble up. > > \starttext > > \holdingmigrations\numexpr1+2+4\relax > > \setbox0\hbox{test \footnote{test} test} > > \setbox2\vbox{\unhcopy0} > > \holdingmigrations0 > > \setbox4\vbox{\unhcopy0} > > \unhbox0 > > \unvbox2 > > \unvbox4 > > \stoptext > > But I have no clue how all that will work out with (lua) code that > manipulates these things. In list nodes you can consult the pre and post > fields to what got migrated. I don't think that that will work in this case. I'm doing most of the work in "pre_output_filter", which is after all of the insert nodes have been removed from the page and put into their respective boxes. And I can't postpone setting any inserts until then because TeX needs to know their height for when it breaks the page. I don't really like how I have to move the footnotes, but I can't find any better way of doing things. If you're curious, most of the insert code is in these two functions: https://github.com/gucci-on-fleek/lua-widow-control/blob/2bca90/source/lua-… https://github.com/gucci-on-fleek/lua-widow-control/blob/2bca90/source/lua-… Thanks, -- Max

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sync text streams in facing pages
by Pablo Rodriguez 15 Aug '22

15 Aug '22

Dear list, adapting a the sample from mkxl/page-str.mkxl (and code from the list), I came with the following sample: \setuppapersize[A6] \showgrid %\setuplayout[grid=yes] \starttext \input tufte \startoutputstream[es] \dorecurse{25} {\startlanguage[es]\input cervantes-es\stoplanguage% \par\pushoutputstream} \enableoutputstream[en] \dorecurse{25} {\input zapf\par\pushoutputstream} \disableoutputstream \stopoutputstream \synchronizestreams[es,en] \page \flushoutputstream[es] \page \flushoutputstream[en] \stoptext To reorder pages, I rename the output to "wg.pdf" and run the following code: \setuppapersize[A6] \setuplayout[page] \starttext \dorecurse{26} {\ifnum\recurselevel = 1 \externalfigure[wg.pdf][page=\recurselevel]\else \externalfigure[wg.pdf][page=\recurselevel] \externalfigure[wg.pdf][page={\the\numexpr \recurselevel + 25}]\fi} \stoptext I’m afraid that the paragraph mistmatch is clear (the number of pages is way different for each versions). Using the grid, the mismatch is not so evident (but there is still a different number of pages for each version). Page reordering would be in this case: \setuppapersize[A6] \setuplayout[page] \starttext \dorecurse{20} {\ifnum\recurselevel = 1 \externalfigure[wg.pdf][page=\recurselevel]\else \externalfigure[wg.pdf][page=\recurselevel] \externalfigure[wg.pdf][page={\the\numexpr \recurselevel + 19}]\fi} \stoptext I would need that for a bilingual edition. I don’t mind reodering the pages (if there is no other option). But what am I doing wrong not to get synced text streams for facing pages? Many thanks for your help, Pablo

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Accessing inserts from Lua in LuaMetaTeX
by Max Chernoff 15 Aug '22

15 Aug '22

Hi all, I'm trying to manipulate some inserts from Lua in LuaMetaTeX, and I'm having some problems that I'm not having with LuaTeX. First, how do I get an insert's class/type from the "insert" nodes on the page? With LuaTeX, the insert's class/type is the same as the subtype of the "ins" nodes, but the subtype of the "insert" nodes is always zero in LuaMetaTeX, so I'm not sure how to get the class/type. Second, how do I get the head of the insert box from Lua? With LuaTeX, from TeX you would use "\box<class>" and from Lua you can use "tex.box[<class>]". With LuaMetaTeX, you use "\insertbox<class>" from TeX, but I'm not sure how to get at the insert box from Lua. The context for both of these is that my module lua-widow-control sometimes moves a line containing footnotes to the next page, so I need to do some surgery to make sure that the "footnote marks" stay with the "footnote text". This is tricky but doable with LuaTeX, but I can't seem to get it to work with the new inserts in LuaMetaTeX, hence the above questions. Thanks, -- Max

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Keep the right margin in [nothyphenated, flushleft] columns
by Marcin Ciura 13 Aug '22

13 Aug '22

Dear list, I am typesetting [nothyphenated,flushleft] text in two columns. Some words stick through the right margin of the left column, sometimes even overlapping the right column. How can I make Context obey the right margin? The MWE is below. Here is the output PDF: https://live.contextgarden.net/cgi-bin/result.cgi?id=UnSfnS Best regards, Marcin \setupalign[nothyphenated,flushleft] \starttext \startitemize[n,nowhite,columns,two] % The word '(boków' sticks through the right % margin of the left column. \item {\bf Wielokąt} to figura na płaszczyźnie, której brzeg składa się z~odcinków ({\bf boków wielokąta}). Końce boków nazywamy wierzchołkami wielokąta. Czasem wyróżniamy jeden bok, nazywając go podstawą wielokąta. \stopitemize \stoptext

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Changing the caption on a split table
by Bruce Horrocks 13 Aug '22

13 Aug '22

I have a 5-page table placed using \setupcaption [table] [way=bytext,prefixsegments=none] \placetable[split]{My long table}{...} The caption for the first table page is "Table 1a My Long table"; for the second table page it is "Table 1b My long table" and so on. I'd like to change these to be "Table 1 My Long table" then "Table 1 (cont'd) My long table" for the remaining pages. I've tried \setupcaption[table][suffix={(cont'd)] but that affects all the pages. How can I set it for the second and subsequent pages only, please? — Bruce Horrocks Hampshire, UK

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How to do code listings & sections from XML (AsciiDoc)
by Mojca Miklavec 13 Aug '22

13 Aug '22

Hi, Hans helped me out with some asciidoc processing a while ago. I played a bit further, but I'm currently facing two minor issues: (a) I don't know how to turn program listing (verbatim code) from xml to (perhaps, vim-based) syntax highlighting (but most importantly, to make sure that line breaks work properly) (b) some section titles are missing Ad (a). The source that looks similar to this: <programlisting language="cpp" linenumbering="unnumbered"> int main() { return 0; } </programlisting> should be converted into some kind of equivalent of % on top \usemodule[vim] \definevimtyping [CPP] [syntax=cpp] \startCPP int main() { return 0; } \stopCPP In the attachment I have the source document (test.adoc), the generated docbook xml that should be further processed, and test.tex that one processes to get the final pdf. Any hints would be greatly appreciated. Mojca

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image with rounded corners
by Henning Hraban Ramm 12 Aug '22

12 Aug '22

Hi, can ConTeXt make rounded image corners? Both of my approaches don’t work: \externalfigure[mill][ width=3cm, frame=on, corner=round,radius=1cm, backgroundcorner=round,backgroundradius=1cm, ] \defineoverlay[Mill][{% \externalfigure[mill][width=\overlaywidth] }] \framed[background=Mill,width=3cm,height=4cm, corner=round,radius=1cm, backgroundcorner=round,backgroundradius=1cm, offset=overlay]{} Hraban

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Re: [NTG-context] Fwd: Typesetting modern Greek (UTF8) with ConTeXt
by Hans Hagen 12 Aug '22

12 Aug '22

On 8/12/2022 2:57 AM, Adam Reviczky wrote: > Hi Hans, > > I get a 'Nonletter' error with *fmtutil* for the mkii greek patterns (from > the latest cont-tmf.zip 2022-08-05 17:17). > > Is that an issue with texlive's *fmtutil* itself or something wrong with > the mkii greek pattern file? Actually, we never had a greek hyphenation pattern file, only for ancient greek. Modern greek in mkii has not encoding defined (we're talking 2005 and before when Tomas made the greek encoding that dealt with utf in pdftex). It has to do with 'setting what are letters' and these modern greek patterns have plenty different. You can patch lang-grk.mkii: \installlanguage [\s!gr] [\c!spacing=\v!packed, \c!leftsentence=---, \c!rightsentence=---, \c!leftsubsentence=---, \c!rightsubsentence=---, \c!leftquote=\greekleftquot, \c!rightquote=\greekrightquot, \c!leftquotation=\greekleftquot, \c!rightquotation=\greekrightquot, % we're missing an encoding for greek \s!patterns=\s!agr, \s!mapping=\s!agr, \s!encoding=\s!agr, % but one can use mkiv / lmtx anyway \c!date={\v!day\ \v!month\ \v!year}] At least you get something. In mkiv and lmtx we have both. Just curious: you're still in mkii? 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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parameters of (setup)externalfigure, conversions etc.
by Henning Hraban Ramm 12 Aug '22

12 Aug '22

Hi Hans, yesterday you told me about the image conversions in grph-con.lua, and I tried to find out how to use them. Up to know I only knew "mp" for SVG images. I found I can use "gray.pdf" or "cmyk.pdf" to convert an image (JPG or PNG) to grayscale/CMYK, but the resolution isn’t used for downsampling (of course, it’s not mentioned in the command template): \externalfigure[hacker][conversion={gray.pdf},resolution=72] I tried to write my own downsampling converter, but don’t understand how I can hook it into the list of converters: """ local downsample = sandbox.registerrunner { name = "downsample", program = "gm", template = [[convert -compress Zip -sampling-factor 1x1 -density %resolution%x%resolution% -resample %resolution%x%resolution% %oldname% %newname%]], checkers = checkers, defaults = defaults, } programs.downsample = { runner = downsample } """ (I’m not sure if I must calculate the desired pixel size beforehand.) -*-*- Apart from converters, there are several parameters of \externalfigure that I don’t understand and thus can’t document in the Wiki; a few are even not yet documented in the interface files: * equalwidth/equalheight * s/sx/sy * xmax/ymax * prefix, label, comment * bodyfont * mask * frames (≠ frame) * interaction, crossreference * resources * display * order * crop, transform * controls, preview: only related to video and thus obsolete? * hfactor/wfactor: When do these make sense? (I know factor) I accidentally learned that I can use parameters of \framed, but the inheritance from \setupframed is not explicit – some are mentioned, like backgroundcolor, others not, even if they work, like corner (but they don’t affect the image). Hraban

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Numbercommand and title
by Fabrice Couvreur 12 Aug '22

12 Aug '22

Hello, How to make the period after the number be after the second parenthesis when there is a title like this Définition 1.1 (Title). ? Thanks Fabrice ################################################ \definestructureconversionset [structure] [n, R, n, n, n] [n] \defineconversionset [digit] [] [n] \setupheads[sectionconversionset=structure] \setupenumerations [before={\blank}, after={\blank}, alternative=serried, distance=0.5em, title=yes, titleleft=, titleright=, titlestyle=normal, numbercommand=\groupedcommand{}{.}, titlecommand=\groupedcommand{(}{)}, width=broad, way=bychapter, prefix=yes, prefixsegments=chapter, prefixconversionset=digit,] \defineenumeration [definition] [text=Définition, number=yes, style=italic] \starttext \startchapter [title={First Chapter}] \startdefinition [title={My first définition}] \input{ward} \stopdefinition \startdefinition \input ward \stopdefinition \startdefinition [title={My third définition}] \input ward \stopdefinition \stopchapter \stopchapter \stoptext

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ntg-context August 2022