May 2018 - ntg-context - NTG Mailing Lists

Defining command with optional and mandatory arguments
by Christoph Reller 24 May '18

24 May '18

On Wed, 23 May 2018 16:01:05 +0200, Hans Hagen <j.hagen(a)xs4all.nl> wrote: > > On 5/23/2018 3:39 PM, Christoph Reller wrote: >> Hi, >> >> What is the right way to define a command with both mandatory and >> optional arguments, e.g: >> >> \MyCommand[optional][mandatory] >> >> Consider the following MWE: >> >> \unexpanded\def\MyCommand[#1]{ >> \dosingleempty{\doMyCommand[#1]}} >> \def\doMyCommand[#1][#2]{ >> \doifsomething{#1}{number 1: #1\par} >> \doifsomething{#2}{number 2: #2}\blank[big]} >> \starttext >> \MyCommand[A][B] >> \MyCommand[A] >> \stoptext >> >> In last year's versions of ConTeXt the output was >> >> number 1: A >> number 2: B >> number 1: A >> >> In the latest version of ConTeXt the output is >> >> number 1: A >> number 2: B >> number 2: A >> >> Is this behavior intended? How can I make a definition whose behavior >> does not change in new versions of ConTeXt? > i'm not sure wht happens at your end but this is the best way: > > \unexpanded\def\MyCommand > {\dodoubleempty\doMyCommand} > > \def\doMyCommand[#1][#2]% > {\iffirstargument > number 1: #1% > \par > \fi > \ifsecondargument > number 2: #2% > \fi > \blank[big]} > > \starttext > \MyCommand[A][B] > \MyCommand[A] > \stoptext Thank you Hans for this information. My question is rather about error handling. I want: \MyCommand[A][B] % <- succeeds with #1->A, #2->B \MyCommand[A] % <- succeeds with #1->A \MyCommand % <- fails with "! Use of \MyCommand doesn't match its definition" I just wanted to ask whether there is a standard way to achieve this with \do<whatever>empty. If not, then this is also okay. Cheers, Christoph

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\showgrid not working right
by Marcus Vinicius Mesquita 23 May '18

23 May '18

Dear list, The frame around text area is appearing way below where it should be. Minimal working example: \setuplayout[grid=yes] \showgrid \starttext \input knuth.tex \stoptext My context version: mtx-context | current version: 2018.05.19 21:46 mkiv lua stats > used platform: linux-64, type: unix, binary subtree: texmf-linux-64 mkiv lua stats > used engine: luatex version 1.08 with functionality level 6731, banner: this is luatex, version 1.08.0 (tex live 2018) Marcus Vinicius

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Defining command with optional and mandatory arguments
by Christoph Reller 23 May '18

23 May '18

Hi, What is the right way to define a command with both mandatory and optional arguments, e.g: \MyCommand[optional][mandatory] Consider the following MWE: \unexpanded\def\MyCommand[#1]{ \dosingleempty{\doMyCommand[#1]}} \def\doMyCommand[#1][#2]{ \doifsomething{#1}{number 1: #1\par} \doifsomething{#2}{number 2: #2}\blank[big]} \starttext \MyCommand[A][B] \MyCommand[A] \stoptext In last year's versions of ConTeXt the output was number 1: A number 2: B number 1: A In the latest version of ConTeXt the output is number 1: A number 2: B number 2: A Is this behavior intended? How can I make a definition whose behavior does not change in new versions of ConTeXt? Cheers, Christoph

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Trim blank space of a PDF page
by Procházka Lukáš Ing. 23 May '18

23 May '18

Hello, just curious - is threre a way how to crop a page of a PDF via ConTeXt? Ideally - to process a single page PDF into another file, with the one page cropped... Best regards, Lukas -- Ing. Lukáš Procházka | mailto:LPr@pontex.cz Pontex s. r. o. | mailto:pontex@pontex.cz | http://www.pontex.cz | IDDS:nrpt3sn Bezová 1658 147 14 Praha 4 Mob.: +420 702 033 396

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referenceprefix=+ not working
by Henri Menke 23 May '18

23 May '18

Dear list, the option referenceprefix=+ for setuphead seems to not work. https://tex.stackexchange.com/questions/432844 It works however if you put an explicit prefix. See MWE below. Reproducible on TL2018 and latest beta. Cheers, Henri --- \setuphead [section] [referenceprefix=+] % when I put "test" it works \starttext \startsection[reference=test,title={Test}] \startplacefigure[reference=cow] \externalfigure[cow] \stopplacefigure \stopsection \in[test:cow] % ?? \stoptext

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Referring to \head
by Procházka Lukáš Ing. 23 May '18

23 May '18

Hello, referring to \head doesn't work in the ME bellow: ---- \starttext \startitemize[n][] \item[a] A \head[b] B bbb \item See \in[a] and \in[b]. \stopitemize \startitemize[n][] \item See \in[a] and \in[b]. \stopitemize \stoptext ---- \head doesn't recongize its reference name (ignores [] after it), although it should not: http://wiki.contextgarden.net/Command/head What am I doing wrong? - How to refer to a \head? (Referring to \item works well.) TIA. Best regards, Lukas -- Ing. Lukáš Procházka | mailto:LPr@pontex.cz Pontex s. r. o. | mailto:pontex@pontex.cz | http://www.pontex.cz | IDDS:nrpt3sn Bezová 1658 147 14 Praha 4 Mob.: +420 702 033 396

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DTD's and XML-ConTeXt question
by Hans van der Meer 23 May '18

23 May '18

Here is a sample xml-document: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE namen SYSTEM “setup/xmp.dtd" [ <!ENTITY example “This is an example"> ]> <root>&example;&xmpl;</root> The file setup/xmp.dtd contains the line: <!ENTITY xmpl "This is an example from a DTD file”> My 1st question, why does this fail for &xmpl;? The &example; is substituted but &xmpl; is not. My 2nd question is why included files do not substitute either of these two entities. Thus in: <root>xml-document-included</root> processed by \xmlprocessfile{}{included-file}{}</root> nor &example; nor &xmpl; is substituted. So, what am I doing wrong here? Hans van der Meer

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\vfrac (math mode)
by Alan Braslau 22 May '18

22 May '18

Is there a version of the vulgarfraction that works in math mode? MWE: \starttext $\vfrac{2_1}{m}$ \stoptext Alan

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Upcoming 12th ConTeXt Meeting in the Czech Republic
by Willi Egger 22 May '18

22 May '18

Hello all! I would like to point you to the upcoming 12th ConTeXt-meeting. Details can be found on the ConTeXt-Wiki! (http://meeting.contextgarden.net/) The registration is open. Early bird registrations will be accepted until 1 of July. The 12th ConTeXt Meeting will take place in Sibřina, Czech Republic on September 2–8, 2018. Everybody is welcome! Kind regards Willi Egger cg-secretary

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Question about \definedescription
by Procházka Lukáš Ing. 22 May '18

22 May '18

Hello, the following defintions: ---- \definedescription[A][alternative=top] \A{Aaa} \input knuth \definedescription[B][alternative=hanging] \B{Bbb} \input knuth ---- generate texts shaped: ---- Aaa Thus, I came to the conclusion that the designer Bbb Thus, I came to the conclusion that the designer ---- How to \definedescription so to get: ---- QQQ Thus, I came to the conclusion that the designer ---- IOW, to keep "alternative=top" (= next text from a new line) but to keep some indenting from left? TIA. Best regards, Lukas -- Ing. Lukáš Procházka | mailto:LPr@pontex.cz Pontex s. r. o. | mailto:pontex@pontex.cz | http://www.pontex.cz | IDDS:nrpt3sn Bezová 1658 147 14 Praha 4 Mob.: +420 702 033 396

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