[Tex/LaTex] Using \ttfamily with \bfseries (or how to enable bold in fixed-width font)

boldlistingstypewriter

I'm using listings package, and I've added basicstyle=\ttfamily\footnotesize. However, when I do that, the keywords from the embedded source-code are not bold anymore.

I figured that \ttfamily together with \bfseries does not work.

And then I found a FAQ about bold-extras, and I tried adding \usepackage[bold-extras], and it didn't work either. What does that package do? Should I just ignore it and move on?

And then I finally found Using bold/italic text inside listings?, which may be a duplicate to this one, but was a lot harder to find. I also found Bold Typewriter Type fonts, which got me more confused.

So, what should I do in order to get a bold fixed-width font for use within listings?

Using pdflatex from texlive-2010.

Best Answer

As Martin mentioned in the comment you need a font which provides such a combination. In the following example you can see that the font courier has this combination implemented instead of Computer Modern.

\documentclass{article}
\usepackage{listings}
\begin{document}

% Default Computer Modern font (no bold implemented)
\renewcommand{\ttdefault}{cmtt}
\begin{lstlisting}[basicstyle=\ttfamily\bfseries]
y:=2
\end{lstlisting}

% Using Courier font
\renewcommand{\ttdefault}{pcr}
\begin{lstlisting}[basicstyle=\ttfamily\bfseries]
y:=2
\end{lstlisting}

\end{document}

The first "y:=2" is not rendered as bold, but the second one is.

Related Solutions

[Tex/LaTex] Fixed Width Font with LTXexample environment

The problem is that the default setting of listings with "fixed columns" has a space 0.6em wide, while the characters in Computer Modern Typewriter are 0.5em wide. So you need only to add the options

columns=fixed,basewidth=.5em,

to \lstset.

One can do without knowing the character width by saying something like

\sbox0{\small\ttfamily A}
\edef\mybasewidth{\the\wd0 }
\lstset{
    basicstyle=\small\ttfamily,% print whole listing small
    columns=fixed,basewidth=\mybasewidth,
    ...}

[Tex/LaTex] Emphasizing words within a string using the listings package in LaTeX

I understand that this may be a moot point, since you only provide a minimal example. However, I also assume that highlighting the string ing in "Str ing " may be limited to only that specific instance in your code. For that, there is no need to define a style that is global to the entire listing. You could momentarily escape the listings environment (producing a local change), and typeset something using standard LaTeX by setting the mathescape=true flag:

\documentclass{article}
\usepackage{listings}
\usepackage{xcolor}
\begin{document}

\lstset{
    emph={ing},
    emphstyle={\color{red}\textit}
}

\begin{lstlisting}[
    frame=trBL,mathescape=true,
    caption={R-Code (test).},
    label={code:R_allee}
]
# comment
square <- function(x) {
    x^2
}

nerv = "Str $\color{blue}\textbf{ing}$ "
burn ing = hot

x <- c(1:100)
y <- square(x)
\end{lstlisting}

\end{document}

mathescape from within lstlisting

Another good example of such an illustration: Lstlistings: Getting pretty equations in display mode

Best Answer

Related Solutions

[Tex/LaTex] Fixed Width Font with LTXexample environment

[Tex/LaTex] Emphasizing words within a string using the listings package in LaTeX

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