listings package-How to highlight something that starts with one @

Question

I would like to highlight any expression made of letters and that starts with one @. The use of moredelim=*[s][\color{blue}]{@}{\ } works only in case like @name is followed by one space. The following code nearly works except that I do not want the parenthesis to be colored in case like @decorator(x=3, y='some text') because that is @decorator( which is caught.

moredelim=[s][\bfseries\color{gray}]{@}{\ },
moredelim=[s][\bfseries\color{gray}]{@}{(},

The use of moredelim=[s][\bfseries\color{gray}]{@}{(} is not a good solution because the search is done one sevral lines... :-(

Answer 1

This is possible. The package provides the command morecomments, which can be used to declare a sequence of arbitrarily delimited symbols to be a comment, and set up its unique formatting. The command

\lstset{morecomment=[s][\color{blue}]{@}{\ }}

means that any sequence of symbols ([s]) delimited by @ and space, will be typeset in blue.

\documentclass{article}
\usepackage{listings,xcolor}
\pagestyle{empty}
\lstset{language=bash}
\lstset{morecomment=[s][\color{blue}]{@}{\ }}
\begin{document}
\begin{lstlisting}
# This is an example
@Blueword # This will be done properly
for x in *~; do
  echo $x;
done
# This too
@Blueword x
for x in *~; do
  echo $x;
done
# And this one
@Blueword 
for x in *~; do
  echo $x;
done
\end{lstlisting}
\end{document}