Using \ttfamily with \bfseries (or how to enable bold in fixed-width font)

Question

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.

Answer 1

As Martin mentioned in the comment, you need a font which provides such a combination. The following example shows 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}

Answer 2

A different option is to use the Latin Modern fonts, that sport a fully featured boldface typewriter font. They have also another feature, because they can use a lighter version for the medium weight:

\usepackage[lighttt]{lmodern}

Let's compare a couple of examples:

\documentclass{article}
\usepackage[T1]{fontenc}

\usepackage{lmodern}

\begin{document}

Abc {\ttfamily abc \bfseries abc}

\end{document}

\documentclass{article}
\usepackage[T1]{fontenc}

\usepackage[lighttt]{lmodern}

\begin{document}

Abc {\ttfamily abc \bfseries abc}

\end{document}

Where the distinction between the weights in monospaced fonts is crucial, this can be an option.

This will work out of the box with listings and the option

basicstyle=\ttfamily,

will suffice after having loaded lmodern with or without the lighttt option.

Answer 3

Bold-extra is not a package you load, it is a collection of fonts. But as this are metafont (bitmap) fonts I wouldn't recommend using them. Better switch either to the lmodern fonts, or use the luximono or the beramono-typewriter font:

\documentclass[11pt]{article}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
%\usepackage{luximono}
%\usepackage[scaled=0.85]{beramono}
\begin{document}
abc 
\ttfamily abc \bfseries abc

\end{document}

Answer 4

You can also use poors-man-bold \pmb from the package amsbsy:

\usepackage{amsbsy}
[...]
\begin{lstlisting}[keywordstyle=\pmb,language=C]
for (i = 0; i < 10; ++i)
\end{lstlisting}

Answer 5

The answer by egreg loads new fonts that seems to change fonts for the whole document -- not only in listings (in my document it changed the font used in paragraphs).

The accepted answer uses pcr -- some may find it not very beautiful. You could use lmtt instead.

Below is the version that uses lmtt and additionally wraps the font-change command into the new command.

Put into the preamble of your document:

\newcommand*{\ttfamilywithbold}{\fontfamily{lmtt}\selectfont}

Now, use it like this:

\begin{lstlisting}[basicstyle=\ttfamilywithbold,language=python,mathescape]
b_reach`= $C$
while (b_reach $\neq$ b_reach`):
  b_reach = b_reach`
  b_reach`= b_reach $\cup$ b_pred_b(b_reach, $P$, $\pgraph$)
if b_reach` contains an initial state:
  return 'Yes'
return 'No'
\end{lstlisting}

You will get:

And compare it with non-bold version (that has \ttfamily instead of ttfamilywithbold):

The main source: How do I use a particular font for a small section of text in my document?