line-breaking
Here, it is just a example. I have a line:
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaa
Now, I want to let LaTeX automatically wrap the line according to the width of the text block/margins.
It is indeed possible to reproduce the described behavior with the svjour3 document class for SPringer journals with the following minimal code
\documentclass[twocolumn]{svjour3}
\usepackage{lipsum}
\begin{document}
\lipsum[1-14]
\end{document}
The highlighting was added manually:
The reason this is occurring is that TeX was not able to meet all the rules for spacing as per the Overfull \hbox messages. One way to fix this is to add \sloppy which relaxes the rules for inter word spacing. See the answers to Why is text being placed beyond the specified line width? for a more detailed explanation.
\documentclass[twocolumn]{svjour3}
\usepackage{lipsum}
\begin{document}\sloppy
\lipsum[1-14]
\end{document}
which yields:
Alternatively, as Marco suggested, you could add \usepackage{microtype} to the preamble. See the microtype package documentation for more details.
If you are not set on justified text, you can use \raggeddright, or \RaggedRight from the ragged2e package.
The Pygments AMPL lexer treats whitespace as Pygments Text.Whitespace tokens, which are "for specially highlighted whitespace". As a result, indentation appears not as plain indentation characters (which is what minted's breaklines works with), but rather as those characters wrapped in a Pygments token macro (in this case, \PYG{+w}{<whitespace_chars>}).
The easiest solution is to edit ampl.py to replace (r'\s+', Text.Whitespace) with (r'\s+', Text). It would technically be possible for minted to look for whitespace at the start of the first token in each line, but implementing that correctly (particularly if the token type needs to be taken into account) might be complicated.
Best Answer
You are probably looking for something like the seqsplit package.
Update:
For lines with spaces the
\seqsplitcommand can of course be used several times.