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document config_foreach, close #2162

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docs/config.tex
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@ -57,6 +57,19 @@ after \texttt{config\_load} is done.
That allows you to process sections both before and after all options were
processed.
Another way of iterating on config sections is using the \texttt{config\_foreach} command.
Syntax:
\begin{Verbatim}
config_foreach <function name> [<sectiontype>] [<arguments...>]
\end{Verbatim}
This command will run the supplied function for every single config section in the currently
loaded config. The section name will be passed to the function as argument 1.
If the section type is added to the command line, the function will only be called for
sections of the given type.
You can access already processed options with the \texttt{config\_get} command
Syntax:
@ -80,3 +93,9 @@ Syntax:
config_set <section> <option> <value>
\end{Verbatim}
If a config section is unnamed, an automatically generated name will
be assigned internally, e.g. \texttt{cfg1}, \texttt{cfg2}, ...
While it is possible, using unnamed sections through these autogenerated names is
strongly discouraged. Use callbacks or \texttt{config\_foreach} instead.