First effort at writing a Nix lstlisting language definition.

lstnix.sty

\definecolor{identifiercolor}{rgb}{0.8,0.6,0.9}
\definecolor{keywordcolor}{rgb}{0.6,0.9,0.6}
\definecolor{commentcolor}{rgb}{0.8,0.8,0.9}
\definecolor{stringcolor}{rgb}{0.5,0.6,0.9}
\lstdefinelanguage{Nix}{
  % Anything betweeen $ becomes LaTeX math mode
  mathescape=false,
  % Comments may or not include Latex commands
  texcl=false,
  keywords=[1]{inherit,import,if,then,else,false,true,or,rec,let,in,assert,with},
  % Comments delimiters, we do turn this off for the manual
  comment=[l]{\#},
  % Spaces are not displayed as a special character
  showstringspaces=false,
  % String delimiters
  morestring=[b]",
  morestring=[d]'',
  % Size of tabulations
  tabsize=2,
  % Enables ASCII chars 128 to 255
  extendedchars=false,
  % Case sensitivity
  sensitive=true,
  % Automatic breaking of long lines
  breaklines=false,
  % Default style for listings
  basicstyle=\ttfamily,
  % Position of captions is bottom
  captionpos=b,
  % flexible columns
  columns=[l]fixed,
  % Style for (listings') identifiers
  identifierstyle={\ttfamily\color{identifiercolor}},
  % Style for declaration keywords
  keywordstyle=[1]{\ttfamily\color{keywordcolor}},
  % Style for strings
  stringstyle={\ttfamily\color{stringcolor}},
  % Style for comments
  commentstyle={\ttfamily\color{commentcolor}},
  %moredelim=**[is][\ttfamily\color{red}]{/&}{&/},
}[keywords,comments,strings]