I'm using listings package and \lstinputstring command to insert code from a file. Is it possible to hide code comments in inserted code? I'm using a language in which # starts a comment and it lasts until the end of line. I tried to do this with escapeinside option, but I think I don't understand how it works.
[Tex/LaTex] Hiding code comments in listings
listings
Related Solutions
You have to change the \catcode of the newline character to other before defining the environment. Afterwards, you probably want to change the old meaning back:) The following code does the trick. It looks ugly, because everything is on one line, but it has to be, since newline is not newline in here! By the way, if you prefer, you can replace ^^Ms with actual newlines.
{\catcode`\^^M=12 \def\marshal{\lstnewenvironment{mylang}{\lstset{language=text,comment=[s]{^^MXYZ}{^^M^^M},commentstyle=\color{green},basicstyle=\footnotesize\ttfamily,showstringspaces=false,showspaces=false,}}{}}\expandafter}\marshal
You need to use morecomment to add the sequences ;; and ;;;:
\documentclass{article}
\usepackage{listings}
\begin{document}
\lstset{%
comment=[l];,morecomment=[l];;,morecomment=[l];;;,
texcl=true,
escapeinside={;@}{\^^M},
numbers=left
}
\begin{lstlisting}
;;; top level \LaTeX
(defun foo (x)
;; in body
(let ((y (+ x 1))) ; on line $y=x+1$
y)) ;@ \label{code:y}
\end{lstlisting}
A reference to line~\ref{code:y}
\end{document}
Best Answer
I'd just cheat, and specify
commentstyle=\color{white}. This is even used in the manual :-) It does have the defect that if you print on non-white paper you'll see it, but that's usually not happening. Of course, if you have a non-white background, just use the background color instead.Edit: For block comments, you can also use
morecomment=[is]{/*}{*/}, where theimakes the comment completely invisible; however, this doesn't work for single-line comments, instead deleting all of the source code after the first single-line comment it finds.