[Tex/LaTex] Skip line numbers and resume from specific number

line-numberinglistings

I'm a total latex noob, I would like to accomplish something similar to what has been asked here, but rather than resuming numbering from where it was left off, I'd like to pass the new line number as argument to the \Reactivatenumber command. Sort of like this:

\documentclass{article} 
\usepackage{listings}

\lstset{numbers=left,numberblanklines=false,escapeinside=||}
\let\origthelstnumber\thelstnumber
\makeatletter
\newcommand*\Suppressnumber{%
  \lst@AddToHook{OnNewLine}{%
    \let\thelstnumber\relax%
     \advance\c@lstnumber-\@ne\relax%
    }%
}

\newcommand*\Reactivatenumber{%
  \lst@AddToHook{OnNewLine}{%
   \let\thelstnumber\origthelstnumber%
   \advance\c@lstnumber\@ne\relax}%
}

\makeatother
\begin{document}
\begin{lstlisting}
var myFunc = function() {|\Suppressnumber|
    //my function does many great things
    //and it's only 10 lines long!|\Reactivatenumber{12}|
}
\end{lstlisting}
\end{document}

To produce something like this (pardon formatting):

 1 | var myFunc = function() {
   |    //my function does many great things
   |    //and it's only 10 lines long!
12 | }

What would be the right way to define the \Reactivatenumber command? Cheers.

Best Answer

You can set the lstnumber counter to one less than the next line number in Reactivatenumber:

enter image description here

Code:

\documentclass{article} 
\usepackage{listings}

\lstset{numbers=left,numberblanklines=false,escapeinside=||}
\let\origthelstnumber\thelstnumber
\makeatletter
\newcommand*\Suppressnumber{%
  \lst@AddToHook{OnNewLine}{%
    \let\thelstnumber\relax%
     \advance\c@lstnumber-\@ne\relax%
    }%
}

\newcommand*\Reactivatenumber[1]{%
  \lst@AddToHook{OnNewLine}{%
   \let\thelstnumber\origthelstnumber%
   \setcounter{lstnumber}{\numexpr#1-1\relax}%
   %\advance\c@lstnumber\@ne\relax%
  }%
}

\makeatother

\begin{document}
\begin{lstlisting}
var myFunc = function() {|\Suppressnumber|
    //my function does many great things
    //and it's only 10 lines long!|\Reactivatenumber{12}|
}
\end{lstlisting}
\end{document}
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