[OS X TeX] Extracting portions of a LaTeX document to a file

[J. McKenzie Alexander]

Hello,

I'm attempting to extract portions of a LaTeX document to a separate file. Apparently the 'extract' package can do this, but I'm having some difficulty in getting it to work.  Consider the following minimal file:

%-----------
\documentclass{article}
\usepackage[active=true,
  generate=foobar
]{extract}

\begin{document}

This is some text
 
\extractline \title{A title which shouldn't appear}
\extractline \author{Me}
\extractline \date\today 
\extractline \maketitle

This is some other text.

\end{document}
%-----------

When I run this through pdflatex I get the following error message (actually much longer, but very similar in style - a whole bunch of "undefined control sequence" messages):

This is pdfTeX, Version 3.1415926-1.40.10 (TeX Live 2009)
 \write18 enabled.
entering extended mode
(./TSWLatexianTemp_000394.tex
LaTeX2e <2009/09/24>
Babel <v3.8l> and hyphenation patterns for english, usenglishmax, dumylang, nohyphenation, german-x-2009-06-19, ngerman-x-2009-06-19, ancientgreek, ibycus, arabic, basque, bulgarian, catalan, pinyin, coptic, croatian, czech, danish, dutch, esperanto, estonian, farsi, finnish, french, galician, german, ngerman, monogreek, greek, hungarian, icelandic, assamese, bengali, gujarati, hindi, kannada, malayalam, marathi, oriya, panjabi, tamil, telugu, indonesian, interlingua, irish, italian, kurmanji, latin, latvian, lithuanian, mongolian, mongolianlmc, bokmal, nynorsk, polish, portuguese, romanian, russian, sanskrit, serbian, slovak, slovenian, spanish, swedish, turkish, turkmen, ukenglish, ukrainian, uppersorbian, welsh, loaded.
(/usr/local/texlive/2009/texmf-dist/tex/latex/base/article.cls
Document Class: article 2007/10/19 v1.4h Standard LaTeX document class
(/usr/local/texlive/2009/texmf-dist/tex/latex/base/size10.clo)) (/usr/local/texlive/2009/texmf-dist/tex/latex/extract/extract.sty (/usr/local/texlive/2009/texmf-dist/tex/latex/tools/verbatim.sty) (/usr/local/texlive/2009/texmf-dist/tex/latex/xkeyval/xkeyval.sty (/usr/local/texlive/2009/texmf-dist/tex/generic/xkeyval/xkeyval.tex (/usr/local/texlive/2009/texmf-dist/tex/generic/xkeyval/keyval.tex))) (./TSWLatexianTemp_000394.xtr)) (./TSWLatexianTemp_000394.aux)
./TSWLatexianTemp_000394.tex:10: Undefined control sequence.
\GenericError  ...                                
                                                    #4  \errhelp \@err@                                                                  \let \@err@                                                                  \@empty \def \MessageBreak  
#1 \def  ...
l.10 ...ine \title{A title which shouldn't appear}


Any suggestions how this problem might be solved? I've looked around CTAN for other solutions, but it really seems like 'extract' is the only game in town for saving a number of disconnected portions of a document to a single file.

Cheers,

Jason

--
Dr J. McKenzie Alexander
Department of Philosophy, Logic and Scientific Method
London School of Economics and Political Science
Houghton Street, London WC2A 2AE




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