- ntg-context - Mailing Lists

Sending data from lua to context and back to lua
by Rudolf Bahr 08 Feb '18

08 Feb '18

Hello Contexteers! Sometimes the necessity could arise to send data from lua to context and answers back to lua. I tried this by using "read" and "immediate\write" commands in context. These commands are described in chapter 21 and 22 of Donald E. Knuth's "The TeXbook". My question is: Do there exist better and more simple solutions? Here is my WE which is admittedly a little bit ugly, but it works. Appended the pdf-output: ======================================================================== \starttext \startluacode tex.print("Here is lua.") tex.print(" ") tex.print("I'm sending some picture names to Context in order to get back their sizes.") local imageA = "2007-01-01---Intro.png" local imageB = "2007-01-01---Neujahrsballade---1.png" local imageC = "2007-01-01---Neujahrsballade---2.png" local f = assert(io.open("contextin.txt", "w")) f:write(imageA .. "\n" .. imageB .. "\n" .. imageC) f:close() \stopluacode % ------------------------------------------------------------- \openin15=contextin.txt \read15 to \zeileA \read15 to \zeileB \read15 to \zeileC \closein15 \vskip\lineheight ===================================================== \vskip\lineheight Here is \CONTEXT\ and what I got from Lua: \vskip\lineheight \zeileA \\ \zeileB \\ \zeileC \vskip\lineheight Now I'm working ... and write my answers to a file for lua: \\ \zeileA\ width=3000pt height=2000pt \\ \zeileB\ width=1200pt height=900pt \\ \zeileC\ width=1600pt height=1200pt \\ \immediate\openout7=contextout.txt \immediate\write7{\zeileA\ width=3000pt height=2000pt \\} \immediate\write7{\zeileB\ width=1200pt height=900pt \\} \immediate\write7{\zeileC\ width=1600pt height=1200pt \\} \immediate\closeout7 \vskip\lineheight ===================================================== \vskip\lineheight % ------------------------------------------------------------- \startluacode tex.print("Here is lua again and what I got back from Context:") tex.print(" ") tex.print(" ") local f = assert(io.open("contextout.txt", "r")) local contexts_answer = f:read("*a") f:close() tex.print(contexts_answer) \stopluacode \stoptext ======================================================================== Best regards, Rudolf

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Overwritten text with newcolumnsets
by Charles Vejnar 08 Feb '18

08 Feb '18

Hi, I am trying to get a two-column document with figures. After failing with \startcolumns, I tried with newcolumnsets. But the most basic example (see below) is not working properly. The text at the bottom of the first page gets overwritten by the first two line of the column. I think this problem was also reported on Sept 22, 2016 by Jose Luis Arellano on this mailing-list. Do you confirm the problem? Any way/plan to fix it? Thanks so much for your help. Best, Charles % start of example \usemodule[newcolumnsets] \definecolumnset[example][n=2] \starttext \startcolumnset[example] \dorecurse{12}{\input knuth \par} \stopcolumnset \stoptext % end of example

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Testing value of a \def
by Procházka Lukáš Ing. 08 Feb '18

08 Feb '18

Hello, I'm trying to test whether value of \jobname is "Test"; I suppose it should be as the file name is "Test.mkiv". But the code: ---- \starttext \jobname \doifelse{\jobname}{Test}{Yes}{No} \def\T{Test} \ifx\jobname\T True\else False\fi \ctxcommand{doifelse("\jobname" == "Test")}{1}{0} \stoptext ---- yields "No", "False" and "1", so only the printed "1" is what I expect. Why \doifelse and \ifx are evaluated as false? 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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Change of font size affects header text size, too
by Procházka Lukáš Ing. 08 Feb '18

08 Feb '18

Hello, in the following example: ---- \setupheadertexts[Left][Right] \starttext Aaa \page \startsection[title={Sec}] \start \setupbodyfont[6pt] \dorecurse{12}{\input knuth} \stop \stopsection \stoptext ---- header text size on page #2 is small (6 pt) although body font change was intended only to text inside section "Sec" - thus the text "\input knuth" is surrounded by \start ... \stop. How to change the bodyfont size of the running text only (ad-hoc in the middle of the document), without changing header text size? 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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Wrong Lua package loaded by 'require'
by Przemek Wesolek 08 Feb '18

08 Feb '18

Hi, I have problems using PGF graph drawing with ConTeXt. The problem is described on https://tex.stackexchange.com/questions/414102/ It all boils down to Lua trying to load wrong file. When require 'pgf.gd.control' is called, ConTeXt resolvers come into play and 'lua variable format' locates Control.lua -- note the uppercase letter here -- which cannot be loaded (on Linux) and 'require' fails: > sandbox > requiring: pgf.gd.control > resolvers > libraries > locating, level '1', method 'already loaded', name 'pgf.gd.control' > resolvers > libraries > locating, level '1', method 'preload table', name 'pgf.gd.control' > resolvers > libraries > locating, level '1', method 'lua variable format', name 'pgf.gd.control' > resolvers > libraries > lua format, checking 33 paths > resolvers > libraries > lua format, identifying 'pgf/gd/control.lua' using format 'tex' > resolvers > libraries > lua format, 'pgf/gd/control.lua' found on '/opt/texlive/2017/texmf-dist/tex/generic/pgf/graphdrawing/lua/pgf/gd/Control.lua' > resolvers > libraries > locating, level '1', method 'lib variable format', name 'pgf.gd.control' I suspect some part of the system (ConTeXt? kpsewhich? TeXLive?) messes up and the resolver instead of pgf/gd/control.lua hits pgf/gd/force/Control.lua. But I have plainly no experience in where to look... One more place, where I found some traces: in texmf-var/luatex-cache/context/a86c089b384a3076dc514ba966a1fac9/trees/929f6dbc83f6d3b65 dab91f1efa4aacb.lua file I have (in ["content"]["files"]) > ["control.lua"]={ "tex/generic/pgf/graphdrawing/lua/pgf/gd", "tex/generic/pgf/graphdrawing/lua/pgf/gd/force" } as well as (in ["content"]["remap"]) > ["control.lua"]="Control.lua" Clearly not OK. My system is current TeXLive 2017. LuaTeX 1.0.4. ConTeXt 1.01. Ubuntu 14.04 and 16.04. Regards, Przemek

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XITS Math
by Schmitz Thomas A. 05 Feb '18

05 Feb '18

The following test file runs without errors in the texlive version (2017.05.15 21:48) but fails with the current beta (2018.01.24 10:47); several errors "font with asked name 'xits-math' is not found": \definefontfamily [test] [serif] [DejaVu Serif] \definefontfamily [test] [sans] [DejaVu Sans] \definefontfamily [test] [mono] [DejaVu Sans Mono] \definefontfamily [test] [math] [XITS Math] \setupbodyfont [test,10pt] \starttext Hello world. {\ss Sans} {\tt Mono} \math{a^2 + b^2 = c^2} \stoptext Looks like there is a bug somewhere in the font selection mechanism. Thomas

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Scale figure to fill a box
by Wolfgang Schuster 04 Feb '18

04 Feb '18

Hi Hans, I want to use a few graphics as page backgrounds but with the \scale command the image always stays within the borders of the page. Can you add a command (probably easier than adding such a function to \scale) which does as same as in the second row of the example below where the image extends outside of the borders of the frame. A option to clip parts – which can be disabled – of the image which are outside of the frame would be a nice extension to this command (e.g. in case you want a image in a table cell). \setupexternalfigure[location=default] \defineframed [PageBorder] [offset=overlay, rulethickness=2pt, framecolor=red, width=6cm, height=6cm] \starttext \startcombination[nx=2,ny=1,distance=4cm] {\PageBorder{\externalfigure[hacker][factor=fit]}}{} {\PageBorder{\externalfigure[mill] [factor=fit]}}{} \stopcombination \blank[4cm] \startcombination[nx=2,ny=1,distance=4cm] {\PageBorder{\clap{\externalfigure[hacker][height=6cm]}}}{} {\PageBorder {\externalfigure[mill] [width=6cm]}} {} \stopcombination \stoptext Wolfgang

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missing link
by Floris van Manen 04 Feb '18

04 Feb '18

On the contextgarden.net site, at page: http://wiki.contextgarden.net/Mark_IV near the end of the page you see: More sample code Other examples of Lua(TeX) code are to be found on Luigi’s user page as well as http://luatex.bluwiki.com/ the link http://luatex.bluwiki.com/ points to a placeholder page. e.g. not much of an example ;-) .F

2 1

Presentation sections identified by color and mark
by jmmora＠us.es 04 Feb '18

04 Feb '18

Hi, I'm starting a presentation with ConTeXt. I'd like to visually differentiate each section, so I've come up with two complementary approaches to do that: * Use a different color palette for each section, and * Mark the progress bar to indicate the start of each section. I've done an small example (at the end) but: * Last Subject of a Topic take color from next Topic. (e.g. "Some greenB") * I don't like interactionBar styles provided. I'd like something like: |-----|-|-----|--|------ (horizontal line and a vertical line at the begin of each section and a vertical line of different color for current position) other option I like: ######%%@@@@@@HHH&&&&&&& (each letter represents a color. It's a bar with colors marking size of text. So it's a series of color rectangles with colors for each section and a vertical line for current position) The main problems are: * How can I pass the first page of each section to MetaPost? * How can I protect background color of SomeGreenB to be green and not blue? Thanks. -------8< ----- Start example \usemodule[present-original] \usemodule[present-common] \definecolor [PageColor] [black] \definecolor [BackgroundColor] [s=.85] \definecolor [OrnamentColor] [r=.75] \definecolor [PositionColor] [s=.55] \defineoverlay [PageShape][\useMPgraphic{PageShape}] \startuseMPgraphic{PageShape} StartPage ; path p ; pair pa, pb ; numeric len ; color contrastcolor ; numeric i; numeric sections[]; % simulated load of sections sections[0] := 1; sections[1] := 4; sections[2] := 6; pickup pencircle scaled 5pt ; p := (100pt,100pt)--(500pt,100pt); draw p withcolor \MPcolor{OrnamentColor} ; contrastcolor = \MPcolor{PositionColor} ; if (RealPageNumber > 0) and (NOfPages > 0): len := 1/NOfPages ; i := 0; forever : exitunless known sections[i]; pa := point(0+len*sections[i]) of p ; draw (pa+(0,10pt))--(pa+(0,-10pt)) withcolor \MPcolor{OrnamentColor} ; i := i + 1; endfor ; pa := point (0+len*RealPageNumber) of p ; %draw (pa+(0,10pt))--(pa+(0,-10pt)) withcolor contrastcolor ; draw pa withpen pencircle scaled 10pt withcolor contrastcolor ; fi ; StopPage ; \stopuseMPgraphic \setupbackgrounds [text] [background={PageShape}] \starttext \setupdocument[title={Title},location={Place}] \startdocument \definecolor[BackgroundColor][r=0,g=.7,b=0] \startTopic[title={Topic Green}] Some text A \startSubject[title={Some green 1}] more text B \stopSubject \startSubject[title={Some green 2}] more text B \stopSubject \stopTopic \definecolor[BackgroundColor][r=0,g=0,b=0.7] \startTopic[title={Topic Blue}] Some text C \startSubject[title={Some blue}] more text D \stopSubject \stopTopic \definecolor[BackgroundColor][r=.7,g=0,b=0] \startTopic[title={Topic Red}] Some text E \startSubject[title={Some Red}] more text F \stopSubject \stopTopic \stopdocument \stoptext

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Question about an environment
by Fabrice Couvreur 04 Feb '18

04 Feb '18

Hello, How to make the first item on the baseline of the numbering as in the first exercise ? Thanks. Fabrice \defineframed [ACFRAME] [frame=off, boffset=0pt, width=fit, align=flushleft, location=low, background=color, backgroundcolor=MyColorA] \defineframed [EXFRAME] [frame=off, offset=0pt, location=low, width=\struttotal, background=color, backgroundcolor=black, foregroundcolor=white, forgroundstyle=bold] \defineprocessor[ACPROCESSOR][command=\EXFRAME] \defineconversionset[ACCONVERSION][][ACPROCESSOR->n] \defineenumeration [ex] [text=, width=fit, numberconversionset=ACCONVERSION, alternative=serried, number=yes] \starttext \startex \input ward \stopex \startex \startitemize[n] \item One \item Two \item Three \stopitemize \stopex \stoptext

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