Is there a way to suppress the hyphen when using hyphenat with htt option?

Question

I am using the hyphenat package with the htt option.

The whole thing is used to document an application programming interface (API). Consider the following MWE:

\documentclass{minimal}
\usepackage[english]{babel}
\usepackage[htt]{hyphenat}
\usepackage{hyperref}
\usepackage{xparse}
\usepackage{microtype}
\hyphenation{An-Obscenely-Long-Function-Name}
\NewDocumentCommand{\funcref}{mo}{
    \hyperref[#1]{\ttfamily{#1(\IfValueTF{#2}{#2}{})}}}
\begin{document}
    foo bar baz \funcref{AnObscenelyLongFunctionName} \funcref{AnObscenelyLongFunctionName} \funcref{AnObscenelyLongFunctionName} \funcref{AnObscenelyLongFunctionName} \funcref{AnObscenelyLongFunctionName} \funcref{AnObscenelyLongFunctionName} \funcref{AnObscenelyLongFunctionName}
\end{document}

The idea here is to use the custom command \funcref to typeset the function name and refer to a label with that name at the same time. Additionally parentheses (and optionally content inside the parentheses) may be passed as second argument.

Now I have a number of problems with the outcome:

1. I'd like to have the hyphenation provided by hyphenat with htt option, but without an actual hyphen character (at least for teletype text).
2. I'd like to prevent hyphenation to kick in between the function name and the parentheses.
3. Ideally I'd like for LaTeX to be able to figure out the hyphenation based on the capitalization inside the function names. However, this one is not a biggie, I can implement this in Python and feed it to LaTeX in a digestible form instead.

Any ideas?

Answer 1

With luatex you could set \prehyphenchar to zero to suppress the hyphenchar. The setting is by language, so I used ngerman to switch, but you can also define a new language:

\documentclass{article}
\usepackage[ngerman,english]{babel}
\usepackage{xparse}
\usepackage{microtype}

\usepackage{fontspec}
\newfontfamily\myfunctt{lmmono10-regular.otf}

\selectlanguage{ngerman}
\prehyphenchar=0
\hyphenation{An-Obscenely-Long-Function-Name}

\selectlanguage{english}
\prehyphenchar=`\-

\NewDocumentCommand{\funcref}{mo}{{\selectlanguage{ngerman}\myfunctt
    \hyperref[#1]{#1(\IfValueTF{#2}{#2}{})}}}

\usepackage{hyperref}

\begin{document}
AnObscenelyLongFunctionName AnObscenelyLongFunctionName AnObscenelyLongFunctionName
AnObscenelyLongFunctionName AnObscenelyLongFunctionName

    foo bar baz \funcref{AnObscenelyLongFunctionName} \funcref{AnObscenelyLongFunctionName} \funcref{AnObscenelyLongFunctionName} \funcref{AnObscenelyLongFunctionName} \funcref{AnObscenelyLongFunctionName} \funcref{AnObscenelyLongFunctionName} \funcref{AnObscenelyLongFunctionName}
\end{document}

With pdflatex you can do something similar (assuming that your func names are only ascii) by using an OT1 ttfont and using a char from the non-ascii range as hyphenchar (you will get lots of missing chars messages in the log):

\documentclass{article}
\usepackage[ngerman,english]{babel}
\usepackage{xparse}
\usepackage{microtype}
\usepackage[T1]{fontenc}
\DeclareRobustCommand\funcfamily
        {\fontencoding{OT1}\fontfamily\ttdefault\selectfont}
\hyphenation{An-Obscenely-Long-Function-Name}


\NewDocumentCommand{\funcref}{mo}{{%
    \funcfamily\hyphenchar\font=130
    \hyperref[#1]{#1(\IfValueTF{#2}{#2}{})}}}

\usepackage{hyperref}

\begin{document}
AnObscenelyLongFunctionName AnObscenelyLongFunctionName AnObscenelyLongFunctionName
AnObscenelyLongFunctionName AnObscenelyLongFunctionName

    foo bar baz \funcref{AnObscenelyLongFunctionName} \funcref{AnObscenelyLongFunctionName} \funcref{AnObscenelyLongFunctionName} \funcref{AnObscenelyLongFunctionName} \funcref{AnObscenelyLongFunctionName} \funcref{AnObscenelyLongFunctionName} \funcref{AnObscenelyLongFunctionName}
\end{document}