September 2021 - ntg-context - NTG Mailing Lists

cld, postponing and images
by Henning Hraban Ramm 06 Sep '21

06 Sep '21

I think I tangled myself... - I’ve a macro defined in Lua that uses fullpagemakeup and \setlayer to place an image on an empty page. - This macro is called from within a postponing environment. - I check figures.current().status.fullname if the image is found ... - and then read xsize and ysize from figures.current().status.private - I there is no image placed before the postponed ones, figures.current() is nil – If I place one, figures.current() is always the last “normal” one, never that from my macro call. – If I call context.getfiguredimensions({imagename}) within the macro where I calculate the size, and again before context.externalfigure(), then the images are found and have the right size according to figures.currents(), but... - if I didn’t place the same image before anywhere, the previous image is used, and if there was none, the place just stays empty (no dummy box). I don’t know how to resolve this, spent already the whole day to understand the problem this far. At the moment my workaround is to place all used images somewhere outside of the visible page. Hraban

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cld questions
by Henning Hraban Ramm 06 Sep '21

06 Sep '21

Hi again, I’m converting a few macros into Lua (LMTX), but couldn’t find some answers in the docs: * How translates \ifodd\realpageno ? This doesn’t work: if ((tex.getcount("realpageno") mod 2) == 1) then a = 1 end I found tex.ifodd but don’t know how to use it either. * How to access my \def’d macros? Is this supposed to work?: TeX: \def\Something{1cm} Lua: context.Something() (It doesn’t in my case, but if it should, I can investigate.) * TeX primitives Is tex.strut and tex.par supposed to work? Or how should I access these? * interface definitions: Lua: interfaces.implement { name = "MyFun", public = true, --permanent = false, -- what does this mean? arguments = { "string", "string", "string", "string" }, actions = function(reference, y, text, filename) -- a lot end, } TeX: \MyFun{ref:some}{1cm}{bla}{hacker} 0) I don’t understand what “permanent” does and why I should maybe disable it. (cld-mkiv, p.146) 1) The parameter y is actually supposed to be a dimension, but if I declare it "dimen", ConTeXt says there wasn’t a number at "1cm". Or is a measure like that not a dimension? 2) The original interface of \MyFun had two optional parameters. I couldn’t find how to do that with interfaces.implement. cld-mkiv, p.151 (12.7) shows how to do lists or key=value, but not single optional args. I’d be glad to get a few hints. Hraban

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ConTeXt syntax highlighting for Atom
by Henning Hraban Ramm 06 Sep '21

06 Sep '21

Hi, in case you use "language-context" from https://github.com/massifrg/language-context.git : I just updated the command list to LMTX and fixed backslash quoting, please update. (Don’t use the "official" language-context module, it’s very outdated, but the author didn’t react to Massi’s and my offer to take over.) Hraban

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Use MetaPost to distort images?
by Henning Hraban Ramm 06 Sep '21

06 Sep '21

Hi, is it possible to apply geometric transformations to images using MetaPost? This is again way over my head, but I’m still trying different methods to let a ConTeXt document look more “hand-made”. In my example*, I added frame and shadow to a photo and _distorted_ it slightly to have it look like a postcard was glued on the page (with a piece of tape). I’d like to automate and randomize that process. I guess I could achieve something similar with ImageMagick (not with GraphicsMagick), but if it would be possible inside LMTX that would be great. Hraban *) not small enough for the mailing list; see https://sedna.fiee.net/f/fb532dc85c784147a149/

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one quick remark about textext.dflt (vs textext.dlft)
by Garulfo 05 Sep '21

05 Sep '21

Hi all, one remark, I was expecting to be allowed to use textext.dlft but finally the appropriate command appears to be textext.dflt which require to switch F and L letters. Is it on purpose ? would it make sense to have a dlft version to match LeFT ?

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Automatically adjust number of table columns
by Sylvain Hubert 05 Sep '21

05 Sep '21

Dear List, I'm trying to make "\startchoice", "\stopchoice", and "\choice", such that: \startchoice \choice -1 \choice 0 \choice 1 \choice N/A \stopchoice results in (_ for whitespace) A. -1______B. 0______C. 1______D. N/A while \startchoice \choice not so short choice \choice must wrap here \choice another choice \choice yet another choice \stopchoice results in A. not so short choice____B. must wrap here C. another choice_______D. yet another choice In another word, it should have the same effect as the addData() function in the page below (save as whatever.html and open it) <html> <head> <style> table { width: 100%; border: 1px solid black; } #root { width: 10cm; } </style> </head> <body> <div id="root"> </div> <script> function make(tag, children) { const node = document.createElement(tag); for (const c of children) { if (typeof c === "string") { node.appendChild(document.createTextNode(c)); } else { node.appendChild(c); } } return node; } function addData(data) { const root = document.getElementById("root"); let table = make("table", [make("tr", data.map(d => make("td", [d])))]); root.appendChild(table); if (table.scrollWidth <= root.offsetWidth) { return; } root.removeChild(table); table = make("table", [ make("tr", [make("td", [data[0]]), make("td", [data[1]])]), make("tr", [make("td", [data[2]]), make("td", [data[3]])]), ]); root.appendChild(table); if (table.scrollWidth <= root.offsetWidth) { return; } root.removeChild(table); table = make("table", data.map(d => make("tr", [make("td", [d])]))); root.appendChild(table); } addData(["1".repeat(10), "2".repeat(10), "3".repeat(10), "4".repeat(10), ]); addData(["1".repeat(20), "2".repeat(20), "3".repeat(20), "4".repeat(20), ]); addData(["1".repeat(30), "2".repeat(30), "3".repeat(30), "4".repeat(30), ]); </script> </body> </html> Does anyone have an idea how it can be implemented in context? Thanks in advance! Best, Sylvain

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getting line numbers
by Thierry Horsin 05 Sep '21

05 Sep '21

Hi everybody Is there a way to have an automatic access to the current line number of a specific place inside a tex file ? To be more precise, here is what I would like to do. I am currently trying to have some automatic external compilation by g++ of some portion of my tex file as in the following example below. \startC \stopC defines a framed part of text written between lines 538 and 549. Of course, if I add something before or inbetween my framed code, 538 and/or 549 will change. Thus I would like to get these two numbers automatically. Thank you. Thierry \startC #include <iostream> using namespace std; int mysum(int,int); int a; int b; int main () { a=2; b=9; cout << mysum(a,b) << endl; return 0; } int mysum(int a, int b) { return a+b; } \stopC \startluacode myout = io.open("test.cpp", "w") myin = io.open(tex.jobname..".tex", "r") local n=0 for line in myin:lines() do n=n+1 if n>539 and n<550 then myout:write(line.."\n") end end myout:close() myin:close() os.execute("g++ -o test test.cpp") os.execute("./test > tmp") local file=assert(io.open("tmp","r")) local t = file:read("*all") tex.print(t) \stopluacode

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parameters TeX->LuaTeX
by Hans van der Meer 05 Sep '21

05 Sep '21

There is something I do not understand in the passing of parameters from TeX to LuaTex. This is my TeX definition: \def\ListSort[#1]#2{\directlua{hvdm.listsort([===[#2]===],[===[#1]===])}} Calling \ListSort[sep={ + }]{} delivers the string 'sep={ + }' into LuaTeX as the printout in the logfile shows and as intended. However in \ListSort[{ + }]{} the braces have disappeared and transferred is nothing more than ' + '. Why is the transfer messing up the character string I am passing by removing the outer braces? Is this a bug or is it an unavoidable consequence of the TeX-LuaTeX interface? dr. Hans van der Meer

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Re: [NTG-context] getting line numbers
by thierry horsin 04 Sep '21

04 Sep '21

Hi and thank you Aditaya and again Hans. By the way, just for fun , is there a(n easy) way to get the linenumber in the tex file ? Thanks On 03/09/2021 18:04, ntg-context-request(a)ntg.nl wrote: > > ------------------------------ > > Message: 4 > Date: Fri, 3 Sep 2021 14:16:40 +0200 > From: Hans Hagen <j.hagen(a)xs4all.nl> > To: mailing list for ConTeXt users <ntg-context(a)ntg.nl> > Cc: Thierry Horsin <horsin(a)free.fr> > Subject: Re: [NTG-context] getting line numbers > Message-ID: <807e4b7c-97ae-e20e-3207-28393544c5e5(a)xs4all.nl> > Content-Type: text/plain; charset=utf-8; format=flowed > > in this case, thinking a bit different is easier ... > > \starttext > > \startbuffer[MyBuffer] > #include <iostream> > > using namespace std; > int mysum(int,int); > int a; int b; > int main () { > a=2; b=9; > cout << mysum(a,b) << endl; > return 0; > } > int mysum(int a, int b) { > return a+b; > } > \stopbuffer > > We compile and run: > > \typebuffer[MyBuffer][option=C] > > \startluacode > io.savedata("test.cpp",buffers.getcontent("MyBuffer")) > --os.execute("g++ -o test test.cpp") > --os.execute("./test > test.tmp") > os.execute("echo done > test.tmp") > buffers.assign("MyBuffer",io.loaddata("test.tmp")) > \stopluacode > > And get: > > \typebuffer[MyBuffer] > > Or just: > > \typefile{test.tmp} > > \stoptext > > > ----------------------------------------------------------------- > Hans Hagen | PRAGMA ADE > Ridderstraat 27 | 8061 GH Hasselt | The Netherlands > tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl > ----------------------------------------------------------------- > > > ------------------------------ > > ------------------------------ > > Message: 6 > Date: Fri, 3 Sep 2021 09:53:58 -0400 (EDT) > From: Aditya Mahajan <adityam(a)umich.edu> > To: Thierry Horsin via ntg-context <ntg-context(a)ntg.nl> > Subject: Re: [NTG-context] getting line numbers > Message-ID: > <nycvar.YAK.7.77.849.2109030949370.477524(a)ervasbepr.pvz.zptvyy.pn> > Content-Type: text/plain; charset=US-ASCII > > On Fri, 3 Sep 2021, Thierry Horsin via ntg-context wrote: > > > https://github.com/adityam/filter > > Behind the scenes, it works by saving the content in an external file and then > running it through any external program. It also allows for caching the > result, and has many options for customizing the behavior. > > Aditya > >

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Using \vrule within mathmatrix
by fv leung 04 Sep '21

04 Sep '21

\definemathmatrix[pmatrix][matrix:parentheses][simplecommand=pMat] \starttext I used to typeset an augmented matrix this way: \m{\pMat{1,7,-6,\vrule,-4;3,-4,7,\vrule,13;4,3,1,\vrule,9}} But this no longer works. Though I can get over this with \m{\pMat{1,7,-6,¦,-4;3,-4,7,¦,13;4,3,1,¦,9}} , I find the result from the old way looks nicer. Is the using of \backslash vrule within mathmatrix gone for good? \stoptext

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