General ⇒ including text from a "source" file

[dmt]

Hmm, it's not working. I will include the two simple files I am using to test. One is called problems.tex, the "master file"
problem.tex

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\begin{block}{vg1}
\question testing one
\end{block}


\begin{block}{vg2}
\question testing two
\end{block}

test.tex

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\documentclass[a4paper,11pt]{exam}
\usepackage[swedish]{babel}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage{graphicx}
\usepackage{float}
\usepackage{wasysym}


\newsavebox\scratchbox
\newcommand*\includeblocklabel{}
\newcommand*\blocklabel{}
\newif\ifincludeblock

\newcommand*\includeblock[1]{%
  \renewcommand*\includeblocklabel{#1}%
  \input{problems.tex}%
}

\newenvironment{block}[1]{%
  \renewcommand*\blocklabel{#1}%
  \ifx\blocklabel\includeblocklabel
    \includeblocktrue
  \else
    \includeblockfalse
    \begin{lrbox}{\scratchbox}%
  \fi
}{%
  \ifincludeblock\else
    \end{lrbox}%
  \fi
}



\begin{document}



\begin{questions}

%\includeblock{vg1}

\end{questions}
\end{document}

[phi]

OK, the \question command is the problem here. It expects to be in a list environment, but is not if the block is gobbled. You have to disable \question temporarily by inserting

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\let\question\relax

after \includeblockfalse.

[dmt]

Okay, it seems to be working now. Thanks.

[phi]

If you do not mind giving up the environment syntax, then a simpler and more robust solution is possible:

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\newcommand*\ifblock[1]{%
  \renewcommand*\blocklabel{#1}%
  \ifx\blocklabel\includeblocklabel
}

Then the block have to look like this:

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\ifblock{abc}
ABC
\fi