Parsing multi-line warnings in console output

Question

I am writing a parser for warnings. I have extended the width of LaTeX's output so that errors and warnings all occur on a single line.

However, I have a problem with multi-line, formatted warn warnings as these are more difficult to handle.

An example is the following:

Package biblatex Warning: Biber reported the following issues
(biblatex)                with 'kannan_random_1997':
(biblatex)                - Datamodel: Entry 'kannan_random_1997' 
(bibliography.bib): Invalid ISSN in value of field 'issn'.

Here I would like to remove the newline, the (biblatex) and the white-space after it so the warning appears on a single line such as the following:

Package biblatex Warning: Biber reported the following issues with 'kannan_random_1997': - Datamodel: Entry 'kannan_random_1997' Invalid ISSN in value of field 'issn'.

Is there a way of cutting down the output like the above, either by using LaTeX or by changing environment variables/parameters?

MWE:

\documentclass{article}
\begin{document}
    \fontfamily{asdf}\selectfont
    Hello, world!
\end{document}

Answer 1

LaTeX Font Warning: Font shape `OT1/asdf/m/n' undefined using `OT1/cmr/m/n' ins
tead on input line 12.

from

\makeatletter
\DeclareRobustCommand{\GenericWarning}[2]{%
   \begingroup
      \def\MessageBreak{ }%^^J#1}%
      \set@display@protect
      \immediate\write\@unused{^^J#2\on@line.^^J}%
   \endgroup
}
\makeatother
\documentclass{article}
\begin{document}
    \fontfamily{asdf}\selectfont
    Hello, world!
\end{document}