August 2020 - ntg-context - NTG Mailing Lists

Reverse traversing of xml.collected()?
by Gerben Wierda 10 Nov '20

10 Nov '20

I’d like to travese the contents of an xml.collected() in a reverse order. I have for connectionFromXML in xml.collected(viewFromXML,"/connection") do parseXMLConnection( rootFromXML, connectionFromXML, viewFromXML, rootFromOverrideXML) end I tried: local relationTable = xml.collected(viewFromXML,"/connection") for i=#relationTable, 1, -1 do connectionFromXML = relationTable[i] parseXMLConnection( rootFromXML, connectionFromXML, viewFromXML, rootFromOverrideXML) end But apparently my lua knowledge is lacking (severely, I might say) as this ends with “attempt to get length of a function value “ What is the correct way to do it? G

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Tagged PDFs from Context
by Karl Pettersson 02 Sep '20

02 Sep '20

Hi See this discussion. https://github.com/jgm/pandoc/issues/5409#issuecomment-678781349 Would it be possible to generate PDFs with headings tagged like H1, H2, H3, H4..., instead of using the H tag for all levels, which seems to be required for proper rendering with some screenreaders? It seems to me that it would require modfications to the Context source code. https://source.contextgarden.net/tex/context/base/mkiv/strc-tag.lua Any ideas? Best regards Karl Pettersson

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new upload
by Hans Hagen 01 Sep '20

01 Sep '20

Hi, In order to keep the 'context is good for toy math' reputation up to date, in lmtx we can now have proper discretionaries in math and math in discretionaries. The kind of things no one asks for but they might be useful in educational settings. Here are some examples (): \starttext \showframe \enabletrackers[math.toysymbol] \definemathtoysymbol[Plus] [bin][+] \definemathtoysymbol[Minus][bin][-] \definemathtoysymbol[Equal][rel][=] $\dorecurse{199} { x_{#1} \ifodd#1\relax\Plus\else\Minus\fi } x_{200} \Equal n$ \blank \dorecurse{10} { test \discretionary {\darkred hel $\sqrt{y}$ lo} {\darkgreen good $\sqrt{z}$ bye} {\darkblue wel $\sqrt{x}$ come} test } \blank \dorecurse{10} {test me #1 $x + 2x \discretionary class 2 {$+ \, \cdots $} {$ \cdots \, +$} {$+ \, \cdots \, +$} nx$ test } \stoptext You might be able to guess from this code what is supposed to happen. I'll play a bit more with this later (assuming that it's somehow useful). We could predefine a bunch. As usual there might be issues but I'll sort them out when we run into them (it's a non critical feature with not much impact). Hans (who must not forget to document it somewhere) ----------------------------------------------------------------- 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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LuaMetaTex dereferences NULL pointer
by Marcel Fabian Krüger 31 Aug '20

31 Aug '20

Hi, with the latest LuaMetaTeX upload (running on Linux x64), \normalunexpanded tries to write to address 0 and therefore segfaults: \normalunexpanded{abc} \starttext \stoptext ConTeXt fails with mtx-context | fatal error: return code: 139 The most interesting message from valgrind is ==53200== Invalid write of size 4 ==53200== at 0x17113D: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x151625: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x151E40: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x15E1A2: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x154AA1: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x122347: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x4A0C151: (below main) (in /usr/lib/libc-2.32.so) ==53200== Address 0x0 is not stack'd, malloc'd or (recently) free'd ==53200== ==53200== ==53200== Process terminating with default action of signal 11 (SIGSEGV): dumping core ==53200== Access not within mapped region at address 0x0 ==53200== at 0x17113D: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x151625: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x151E40: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x15E1A2: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x154AA1: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x122347: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x4A0C151: (below main) (in /usr/lib/libc-2.32.so) ==53200== If you believe this happened as a result of a stack ==53200== overflow in your program's main thread (unlikely but ==53200== possible), you can try to increase the size of the ==53200== main thread stack using the --main-stacksize= flag. ==53200== The main thread stack size used in this run was 8388608. Best regards, Marcel

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Mathematical symbol of non-inclusion
by Fabrice Couvreur 31 Aug '20

31 Aug '20

Hello, The result is not what you expected. How can I correct this problem? Thank you Fabrice \starttext \m{A \not\subset B} \stoptext

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setuplayout vs Indesign!
by jbf 27 Aug '20

27 Aug '20

Severe Covid-19 restrictions locally have left me out on a limb unable to be side-byside with people who can set me on track for a few things! Hence the bombardment of questions, for which I apologise. But almost there! The InDesign QC individual (who accepts my ConTeXt-produced pdfs) wants some tweaking to my layout, saying, in simple terms:/Odd/right pgs left margin should be 20mm and right margin 15mm; even/left pgs right margin 20mm and left margin 15mm/. I think the difficulty is that what InDesign calls margins might be termed a little differently in ConTeXt and I have no experience with InDesign. My initial setup was as follows for a paper size defined as [width=140mm,height=216mm] double-sided setup (in other words a standard 8.5"x5.5" book): \setuplayout [backspace=16mm, topspace=12mm, header=6mm, headerdistance=10mm, footerdistance=9mm, footer=8mm, width=fit, horoffset=12.7mm, location=middle, height=198mm, marking=on] There was no mention of 'margins' as such in that layout, and the result is close to what is wanted but not quite. Do I solve the problem by adding in: leftmargin=20mm, rightmargin=15mm, or is it some other item I need to adjust to ensure the 20mm/15mm dimensions requested? Julian

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catch % in gsub("%", "\\letterpercent")
by Pablo Rodriguez 27 Aug '20

27 Aug '20

Dear list, I have and \xmlraw command that gives some text with percent signs. ConTeXt parses them as comments (so no output). Using Lua gsub(), I need to replace something like: string.gsub([[\xmlraw{#1}{.}]], "%", "\\letterpercent") How do I need to invoke % to get the character found? Many thanks for your help, Pablo -- http://www.ousia.tk

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wrong 2TOPSIDE?
by Pablo Rodriguez 27 Aug '20

27 Aug '20

Dear list, I have the following sample: \startmode[*first] \startbuffer[abcde] \setuppapersize[A5, landscape] \setupbodyfont[100pt] \starttext \dorecurse{158}{% \startmakeup[page][style=\bf\ss, align=center, pagestatus=start] \recurselevel \stopmakeup} \stoptext \stopbuffer \savebuffer[abcde][singular.tex] \executesystemcommand{context --purgeall --result=\jobname-singular.pdf \jobname-singular.tex} \ctxlua{os.remove(tex.jobname.."-singular.tex")} \stopmode \startnotmode[*first] \setuppapersize[A5, landscape][A4] \setuparranging[2TOPSIDE] \setuplayout[page] \setupinteractionscreen[option={portrait,paper}] \starttext \insertpages[\jobname-singular.pdf][width=0pt] \stopnotmode \stoptext I would say that last page (number 158 on #81) is misplaced. I think it should be on #80. Could anyone confirm this? I’m also experiencing issues (I don’t get the first 11 imposed pages), because I have to use: \executesystemcommand{context --purgeall --result=\jobname-singular.pdf --environment=\jobname-singular.tex \jobname-singular.xml} Is there a fix for this? I’m reporting this right now, but I won’t be reaching a computer until next Wednesday. (I know I’m going to forget, if I don’t write this now.) Many thanks for your help, Pablo -- http://www.ousia.tk

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Wiki New Extension: ConTeXtXML
by Taco Hoekwater 27 Aug '20

27 Aug '20

Hi, As announced last week, I have been working on a wiki extension to control the editing of /Command pages. That extension is now installed on the main wiki. In short, we will switch to XML as the page model for newly created /Command pages. This makes editing a bit harder, but it allows much better quality control and (fairly) easy export and import. The goal is to eventually be able to easily export all of the reference documentation in the wiki to a separate system (for instance, Paul Mazaitis plans to create a full-blown reference manual). In the current situation, this is nearly impossible because there is so much variation in the content and quality of the wiki /Command pages (not to mention that many are missing). We also want it to be possible to merge improvements to the interface xml definitions by Wolfgang without loosing any existing documentation work. The documentation pages are here: https://wiki.contextgarden.net/Command https://wiki.contextgarden.net/Help:Command https://wiki.contextgarden.net/Extension:ConTeXtXML After reading those, have a look at the three ‘work pages’: https://wiki.contextgarden.net/Document_level_commands_work_page https://wiki.contextgarden.net/Style_level_commands_work_page https://wiki.contextgarden.net/System_level_commands_work_page All the bright red links are currently undocumented commands. Clicking on one should bring you to the edit screen automatically, with a blob of XML preloaded, ready for you to start writing. All the dark red links are existing /Command pages. All of those are traditional wiki text pages. Following those links will bring you to a normal /Command page just like on the main wiki. If you want to see how one of those pages would look like in the new system, you’ll have to rename the existing page first (as explained in https://wiki.contextgarden.net/Command#Pre-existing_pages ) If you do some work, please update those work pages! Comments, suggestions and bug reports are more than welcome. Please direct those to me personally or (better) to the wiki mailing list: https://lists.contextgarden.net/mailman/listinfo/wiki Have fun! Taco

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Index formatting difference LMTX and MkIV
by Rik Kabel 26 Aug '20

26 Aug '20

Hello list, I have an index which uses multilevel indexing (a+b+c) to insert entries which contain snips of text. LMTX behaves differently from MkIV when trimming that text, resulting in line wrapping which does not happen with MKiV. I am not sure when this began -- I just picked up work again on this project this week after a hiatus of a couple of months. This does not occur in every instance, but it happens often enough in this 20 page two-column index to add another full page, and it looks ugly in comparison (although perhaps no index looks good). The source is the same for both LMTX and MkIV. There is no explicitly conditional coding. With MkIV, I get: With LMTX, I get: I am struggling to prepare a MWE, but will try to do so if there is no obvious difference to those who ken the code. The problem may not be unique to register creation, but I have not noticed other appearances of the issue in the text. -- Rik

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