[Tex/LaTex] italic font in lmodern-lighttt

fontslistings

In a search for a good monospaced font for my code listings I found the lmodern fonts. I really like the lighttt variant of those. The difference between normal and bold version is clearly visible with the ttfamily.

Recently however I discovered I also need italic version of those. Unfortunately the following:

\documentclass{article}
\usepackage[lighttt]{lmodern}

\begin{document}
Abc {\ttfamily abc {\bfseries abc} {\itshape abc}}
\end{document}

throws an error:

! No declaration for shape OT1/lmtt/l/sl

Is there a way to enable italic in this font?

With a bit of experimentation I soon discovered, that while italic is not available, it is possible to use the slanted font. \slshape works with lmodern-lighttt-ttfamily well enough.

However, while in the above MWE I use the \itshape explicitly and can be easily exchanged with \slshape, in my real scenario it is not always the case.

I use listings package which automatically uses italic font in certain scenarios (e.g. comments in code)
Sometimes I put short pieces of code in a caption, which – as a whole – is italic (and shouldn't use slanted)

A quick hack: \renewcommand{\itshape}{\slshape} is not reasonable in longer run either as it changes all italic fonts to slanted, while my concern is only in the monospaced case – when typing source code.

Maybe there is a way to treat \itshape as \slshape only in the context of monospaced font?

Best Answer

That's a bug in the fd-files (OT1lmtt.fd and T1lmtt.fd): In the "lighttt" section they substitute the lmtt/m/it to lmtt/l/sl instead of lmtt/m/sl. You should report it.

You can get around it with

\documentclass{article}

\usepackage[lighttt]{lmodern}
\ttfamily
\DeclareFontShape{OT1}{lmtt}{m}{it}
     {<->sub*lmtt/m/sl}{}

\begin{document}
Abc {\ttfamily abc  \itshape abc}
\end{document}

Related Solutions

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There is no opentype font Bera Sans Mono, xelatex finds the normal type1 version and as it is not unicode encoded you get garbage.

To quote the CTAN info (http://www.ctan.org/pkg/bera)

The Bera family is a repackaging, for use with TEX, of the Bitstream Vera family.

So with xelatex you should use

\setmonofont{Bitstream Vera Sans Mono}

[Tex/LaTex] Can’t apply monospaced font to listings (when using pdflatex)

You get a warning:

LaTeX Font Warning: Font shape `T2A/fvm/m/n' undefined
(Font)              using `T2A/cmr/m/n' instead on input line 47.

that you shouldn't disregard.

Solution: tell LaTeX you're not using Cyrillic in listings.

basicstyle=\normalsize\fontencoding{T1}\ttfamily,

Full code

\documentclass{book}

\usepackage[beramono]{classicthesis} % The layout is based on the Classic Thesis style

\usepackage{arsclassica} % Modifies the Classic Thesis package
\usepackage{amsfonts}

% Just in case: The main document language is Russian, so I use cp1251.
% Of course, the C++ code doesn't have any cyrillic letters
\usepackage[T1, T2A]{fontenc}
\usepackage[cp1251]{inputenc} 
\usepackage[english, russian]{babel} 


\usepackage{xcolor}
\usepackage{listings}


% Here I change the default font, because the \textbf command doesn't work on it
\renewcommand*\rmdefault{iwona} 

\definecolor{BackgroundColor}{rgb}{0.9,0.9,0.9}
\definecolor{OliveGreen}{rgb}{0,0.6,0}

\lstset{
  basicstyle=\normalsize\fontencoding{T1}\ttfamily,
  language=C++,
  backgroundcolor=\color{BackgroundColor},
  tabsize=4,
  captionpos=b,
  %tabsize=3,
  frame=lines,
  numbers=left,
  numberstyle=\tiny,
  numbersep=5pt,
  breaklines=true,
  showstringspaces=false,
  keywordstyle=\color{blue},
  commentstyle=\color{OliveGreen},
  stringstyle=\color{red}
  }

 \begin{document}

Example of code snippet:

\begin{lstlisting}[language=C++]
#include <Bo/services/Ucntl.h>

ssize_t
__attribute__((nonnull(1))
AorpRelease(
    aorp_object_t aThis,
    aorp_opflags_t Flags /* = 0 */,
    struct aorp_error *anErrPtr /* = NULL */
    );
\end{lstlisting}

\end{document}

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