Add newlines to label-displays in `showkeys` package

Question

I'm using the package showkeys to display labels in my LaTeX file. All my labels are of the form type:name:details. Since my labels tend to get very long (lemma:the_name_of_the_lemma:...) I'd like to redefine the showkeyslabelformat command to break the line at every :.
How is this possible? Is there a way to replace the : by newlines?

Norman Gray · Answer

Ooooh, I was just about to answer and say this was hard (because catcodes), when David replied with a solution using hyphenchar.  Cunning!
So I'll simply chip in by remarking that the exact same command works in showlabels, with only a change of name.
renewcommand*showlabelsetlabel[1]{%
  fbox{parbox[t]{2cm}{%
    raggedrightnormalfontsmallttfamily
    hyphencharfont=`:
    #1}}}

David Carlisle · Answer

showkeys uses the following command to typeset the label
providecommand*showkeyslabelformat[1]{%
  fbox{normalfontsmallttfamily#1}}

so you can redefine that in any way you want,

documentclass{article}

usepackage{showkeys}

renewcommand*showkeyslabelformat[1]{%
  fbox{parbox[t]{2cm}{raggedrightnormalfontsmallttfamilyhyphencharfont=`:#1}}}

begin{document}

section{zzzlabel{section:with:a:long:label}}
begin{equation}
  label{equation:with:an:even:longer:label}
  1=0
end{equation}
end{document}

Add newlines to label-displays in `showkeys` package

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