Line break after command, before period

Question

This is the output of pdflatex:

The relevant LaTeX line is:

You can similarly enable the third and fourth channel by giving \texttt{HIGH} input to \icpin{9}{EN3,4}.

Here is how I defined the \icpin command:

\newcommand{\icpin}[2]{\setlength{\fboxsep}{0pt} \fbox{\texttt{\colorbox{lgray}{\strut{}\,PIN~#1\,}\,#2\,}} \setlength{\fboxsep}{2pt}}

I guess the problem is in the command I defined. How do I force the line break not to come just before a period?

I tried using \@ after the period, did not solve the problem.

Answer 1

The definition you give has two spaces that you should remove

\newcommand{\icpin}[2]{\setlength{\fboxsep}{0pt} \fbox{\texttt{\colorbox{lgray}{\strut{}\,PIN~#1\,}\,#2\,}} \setlength{\fboxsep}{2pt}}
                                                ^                                                          ^

Here's a properly formatted one, with some changes:

\newcommand{\icpin}[2]{%
  \begingroup
  \setlength{\fboxsep}{0pt}%
  \fbox{%
    \ttfamily
    \colorbox{lgray}{\strut\,PIN~#1\,}\,#2\,%
  }%
  \endgroup
}

The group makes the settIng to \fboxsep local to it, so you don't need to explicitly reset it. Using \ttfamily avoids a further pair of braces: the group will limit the effect of this declaration.

Full code:

\documentclass{article}
\usepackage{xcolor}

\definecolor{lgray}{gray}{0.7}

\newcommand{\icpin}[2]{%
  \begingroup
  \setlength{\fboxsep}{0pt}%
  \fbox{%
    \ttfamily
    \colorbox{lgray}{\strut\,PIN~#1\,}\,#2\,%
  }%
  \endgroup
}

\begin{document}

You can similarly enable the third and fourth channel
by giving \texttt{HIGH} input to \icpin{9}{EN3,4}.

\end{document}

Perhaps you should add also thin spaces at either end.

\documentclass{article}
\usepackage{xcolor}

\definecolor{lgray}{gray}{0.7}

\newcommand{\icpin}[2]{%
  \begingroup
  \setlength{\fboxsep}{0pt}%
  \leavevmode\,% <-- don't forget \leavevmode
  \fbox{%
    \ttfamily
    \colorbox{lgray}{\strut\,PIN~#1\,}\,#2\,%
  }%
  \,%
  \endgroup
}

\begin{document}

You can similarly enable the third and fourth channel
by giving \texttt{HIGH} input to \icpin{9}{EN3,4}.

\end{document}

Answer 2

Removing the \, and the extra spaces seems to make the period attached to the box. Here is a beofre and after image:

Code:

\documentclass{article}
\usepackage{xcolor}
\newcommand{\icpin}[2]{%
    \setlength{\fboxsep}{0pt}%
    \fbox{\texttt{\colorbox{gray}{\strut{},PIN~#1,},#2}}%
    \setlength{\fboxsep}{2pt}%
}%
\begin{document}
You can similarly enable the third and fourth channel by giving \texttt{HIGH} input to \icpin{9}{EN3,4}.
\end{document}