5

The following works:

\documentclass{article}
\usepackage{fancyvrb}
\usepackage{color}
\begin{document}

\begin{Verbatim}[commandchars=\\\{\}]
test\textcolor{red}{foo}test
\end{Verbatim}

\end{document}

but the following does not:

\documentclass{article}
\usepackage{fancyvrb}
\usepackage{color}
\begin{document}

\begin{Verbatim}[commandchars=&<>]
test&textcolor<red><foo>test
\end{Verbatim}

\end{document}

I get this error message:

ERROR: Argument of \textcolor has an extra }.

--- TeX said ---
<inserted text> 
                \par 
l.7 test&textcolor<red><foo>test

--- HELP ---
From the .log file...

I've run across a `}' that doesn't seem to match anything.
For example, `\def\a#1{...}' and `\a}' would produce
this error. If you simply proceed now, the `\par' that
I've just inserted will cause me to report a runaway
argument that might be the root of the problem. But if
your `}' was spurious, just type `2' and it will go away.

I've tried all combinations of backslash-escaping the command chars but no luck. How can I use &, <, and > as the command characters? (Or if it's not possible, why?)

11

The problem is that \textcolor expects an actual brace after it, not just a "group open" token: its definition is

\def\textcolor#1#{...}

(here #1 would be the possible "color model" allowed by the syntax). You can do with another command defined in terms of \textcolor:

\newcommand*{\fvtextcolor}[2]{\textcolor{#1}{#2}}

This should work:

\begin{Verbatim}[commandchars=&\[\]]
test&fvtextcolor[red][foo]test
\end{Verbatim}

Not with <>, I'm afraid: these two characters can't be used as delimiters in fancyvrb commandchars (I've already been bitten by this "feature").

  • Thanks! Do you know why < and > can't be used as delimiters in fancyvrb? – Richard Hansen Jul 15 '11 at 16:38
  • 1
    I've never investigated deeply, but I suspect that some \ifnum or \ifdim is involved. – egreg Jul 15 '11 at 18:05
  • what is commandchars in Verbatim? – Tiina Apr 26 '18 at 3:04
  • @Tiina Did you look at the documentation of fancyvrb? – egreg Apr 26 '18 at 8:23
  • @egreg for tex, usually where do you look for its document? I had bad experience when looked for some other packages. For open source project, usually they have an official site, but I found tex package usually has void official website. – Tiina Apr 27 '18 at 6:55

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.