How to create 2 different PDF with the same Context tex source

Question

Is it possible to make 2 (or more) PDF with the same source in Context ?

For example, I want to write a booklet with some algorithmics exercise, and a booklet with the solution wrote in Python (and after Java, C#…)

e.g.

\section{First Exercise} %common title to all booklets
\startQuestion %only for "exercise" booklet
  Write a program to get the software version you are using
\stopQuestion
\startPython %only for Python booklet
  print (sys.version)
\stopPython
\startJava %only for Java booklet
…
\stopJava
\stoptext

I've tried to use modes, but it did'nt work :( The Context Garden wiki is not very clear about that.

Thanks to help me :)

Answer 1

I don't know how to do to compile one tex file once and from it get several pdf files. The following works if you are OK with compiling once for each setup:

\starttext
\section{First Exercise}
\startmode[Question,all]
Write a program to get the software version you are using.
\stopmode

\startmode[Python,all]
print (sys.version)
\stopmode

\startmode[Java,all]
...
\stopmode
\stoptext

Try to compile this the following different options:

• without any option (you should only get the section title).
• --mode=all (you should get everything)
• --mode=Python (you should get the section title and the Python part)

Of course, you could write a small script to compile several times with different modes enabled.

Answer 2

You can also use doifmode

\def\Answers#1#2#3{
    \doifmode{python}{#1} 
    \doifmode{java}{#2}
    \doifmode{csharp}{#3} 
    }

\enablemode[java]
\Answers
{Python code}
{Java code}
{C# code}

I sometimes use doifnotmode, which can be very useful too. For example here

\def\Answers#1#2#3#4{
    \doifmode{python}{#1} 
    \doifmode{java}{#2}
    \doifmode{csharp}{#3} 
    \doifnotmode{python, java, csharp}{\thinrules[color=darkgray, interlinespace=big, n=#4]}
    }

\enablemode[test]
\Answers
{Python code}
{Java code}
{C# code}
{5} % displays 4 lines after the problem

Answer 3

I tested your example. It works, but, when I define my own commands like this

\definestartstop[question][before={\startmode[question]}, after={\stopmode}]
\definetyping[python][before={\startmode[python]}, after={\stopmode}]

When I compile the document above, they print whole text, with any mode selected before ! (--mode=python, --mode=question) !

Maybe I've made a mistake anywhere ?