\ctxlua{os.execute(lua -e "require 'lfs'")}

... Gives: " ... fonts > latin modern fonts are not preloaded languages > language en is active ! LuaTeX error <main ctx instance>:1: attempt to call global 'e' (a nil value) stack traceback: <main ctx instance>:1: in main chunk. system > tex > error on line 4 in file C:/Lukas/ConTeXt/TestDDv/t1.mkiv: LuaTeX error ... 1 %\write18{lua -e "require 'lfs'"} 2 % 3 4 >> \ctxlua{os.execute(lua -e "require 'lfs'")} 5 %\ctxlua{os.execute([[lua -e "require 'lfs'"]])} 6 7 \starttext 8 A 9 \stoptext 10 l.4 \ctxlua{os.execute(lua -e "require 'lfs'")} ... " If I try: \ctxlua{os.execute([[lua -e "require 'lfs'"]])} I get error: " ... languages > language en is active lua: (command line):1: '=' expected near 'lfs' {c:/ConTeXt/tex/texmf-context/fonts/map/pdftex/context/mkiv-base.map} ... " (Like if "'" were gobbled...)

btw, if you run texlua you get lfs for free.

OK, this is just a sample. I need to use another file, in fact. Lukas -- Ing. Lukáš Procházka [mailto:LPr@pontex.cz] Pontex s. r. o. [mailto:pontex@pontex.cz] [http://www.pontex.cz] Bezová 1658 147 14 Praha 4 Tel: +420 244 062 238 Fax: +420 244 461 038

Hello, I slightly modified the example - my code now is: ---- \ctxlua{os.execute([[echo lua -e "print 'WWW'"]])} \starttext A \stoptext ---- So now I'm able to diagnose what exactly is passed to the command line. I'm getting: " ... languages > language en is active lua -e "print "WWW"" {c:/ConTeXt/tex/texmf-context/fonts/map/pdftex/context/mkiv-base.map} ... " So it can be seen that [surprisingly] character ' was substituted for " - and IMHO this causes the problem. Could anyone explain why this substitution is performed and how to avoid it? Best regards, Lukas -- Ing. Lukáš Procházka [mailto:LPr@pontex.cz] Pontex s. r. o. [mailto:pontex@pontex.cz] [http://www.pontex.cz] Bezová 1658 147 14 Praha 4 Tel: +420 244 062 238 Fax: +420 244 461 038

probably some os.execute parsing ...

Do you mean Lua itself does the parsing and substitution? I guessed [lua]tex core... When I try to call on the command line: " C:\Lukas\ConTeXt\TestDDv>lua Lua 5.1.4 Copyright (C) 1994-2008 Lua.org, PUC-Rio

os.execute([[lua -e "print 'WWW'"]]) WWW os.execute([[echo lua -e "print 'WWW'"]]) lua -e "print 'WWW'" =os.exec nil =os.spawn nil

" - There is no '/" substitution in standalone Lua (?!).

does os.exec or os.spawn work ok?

Well, the 'os.exec' works, in condition that it is called with "cmd /c": ---- \ctxlua{os.execute([[echo lua -e "print 'EXECUTE'"]])} \ctxlua{os.exec([[cmd.exe /c echo lua -e "print 'EXEC'"]])} \ctxlua{os.spawn([[cmd.exe /c echo lua -e "print 'SPAWN'"]])} \starttext A \stoptext ---- Gives: " ... languages > language en is active lua -e "print "EXECUTE"" lua -e "print 'EXEC'" system | total runtime: 0.609 " Interesting that the string to be passed to 'os.exec' keeps ' whilst that to 'os.execute' doesn't. Why this happens? Anyhow, thanks for the idea with 'os.exec'. Best regards, Lukas -- Ing. Lukáš Procházka [mailto:LPr@pontex.cz] Pontex s. r. o. [mailto:pontex@pontex.cz] [http://www.pontex.cz] Bezová 1658 147 14 Praha 4 Tel: +420 244 062 238 Fax: +420 244 461 038

... I also tried: ---- \write18{echo 'AAA'} \starttext A \stoptext ---- Which gives: " ... backend > xmp > using file 'c:/ConTeXt/tex/texmf-context/tex/context/base/lpdf-pdx.xml' "AAA" pages > flushing realpage 1, userpage 1 ... " So it can be seen that ' changes to " even in this case. Weird. Best regards, Lukas -- Ing. Lukáš Procházka [mailto:LPr@pontex.cz] Pontex s. r. o. [mailto:pontex@pontex.cz] [http://www.pontex.cz] Bezová 1658 147 14 Praha 4 Tel: +420 244 062 238 Fax: +420 244 461 038

... Finally, I use the following to avoid ' in arguments and to keep " to os.execute(): ---- \bgroup \catcode`\%=11 \ctxlua{os.execute(([[echo lua -e "print 'EXECUTE'"]]):gsub("'(.-)'", "[[%1]]"))} \egroup % Or: \startluacode os.execute(([[echo lua -e "print 'EXECUTE'"]]):gsub("'(.-)'", "[[%1]]")) \stopluacode \starttext A \stoptext ---- None of both solutions are "pure" as I'd imagine but they seem to work. Best regards, Lukas -- Ing. Lukáš Procházka [mailto:LPr@pontex.cz] Pontex s. r. o. [mailto:pontex@pontex.cz] [http://www.pontex.cz] Bezová 1658 147 14 Praha 4 Tel: +420 244 062 238 Fax: +420 244 461 038