\directlua{includeCode("floats/equations")}

%\setmathfont[]{Roboto-Light}

\newcommand{\Newunit  }[3][]{\ensuremath{\ifthenelse{\isempty{#1}}{}{10^{#1}\,}\text{\directlua{tex.print(unit2string([[#2]], false))}}\ifthenelse{\isempty{#3}}{}{{}^{#3}}}}
\newcommand{\Physical }[5][]{\directlua{physical([[#1]],[[#2]],[[#3]],[[#4]],[[#5]])}}
\newcommand{\Unit     }[2]{\directlua{unit([[#1]],[[#2]],true)}}

%\texorpdfstring{\ensuremath{\text{·\directlua{tex.print(unit2string([[#1]], false))}}\directlua{if not ([[#2]] == [[]]) then tex.print([[{}^{]]..bs..[[text{#2}}]]) end}}}{·\directlua{tex.print(unit2string([[#1]], false))}\^{\text{#2}}}}

\newcommand{\defineVar}[2]{\ensuremath{#1 & ....\text{#2} \nonumber}}
\newcommand{\assignVar}[2]{\ensuremath{#1 & = #2 \nonumber}}
\newcommand{\assign   }[3][]{\ensuremath{\ifthenelse{\equal{#1}{}}{}{\labelEquation{#1}}#2 & = #3}}
\newcommand{\explainVar}[1]{\defineVar{\acrshort{#1}}{\acrlong{#1}}}

\newcommand{\equations}[1]
{
  \begin{align}
    #1
  \end{align}
}

\newcommand{\calculations}[1]
{
  \begin{align*}
    #1
  \end{align*}
}

\def\defaultdecimals{4}
\newcommand{\putlua}[2][\defaultdecimals]{\directlua{tex.print(string.format(string.char(37).."."..[[#1]].."f", #2))}}

\let\oldr@@t\r@@t
\def\r@@t#1#2{%
\setbox0=\hbox{$\oldr@@t#1{#2\,}$}\dimen0=\ht0
\advance\dimen0-0.2\ht0
\setbox2=\hbox{\vrule height\ht0 depth -\dimen0}%
{\box0\lower0.4pt\box2}}
\LetLtxMacro{\oldsqrt}{\sqrt}
\renewcommand*{\sqrt}[2][\ ]{\oldsqrt[#1]{#2}}

\AtBeginDocument{\renewcommand{\d}{\mathrm{d}}}

%\newcommand{\physical }[5][]{\ifthenelse{\isempty{#1}}{\directlua{fun = load("return "..[[#2]]) if ( fun == nil ) then tex.print([[2]]) else tex.print(fun()) end}}{\directlua{tex.print(string.format(string.char(37).."."..[[#1]].."f", load("return "..[[#2]])()))}}\ensuremath{\ifthenelse{\isempty{#3}}{}{\cdot10^{#3}}\ifthenelse{\isempty{#4}}{}{\,\text{#4}\ifthenelse{\isempty{#5}}{}{{}^{#5}}}}}
%\newcommand{\newunit  }[3][]{\ensuremath{\ifthenelse{\isempty{#1}}{}{10^{#1}\,}\text{#2}\ifthenelse{\isempty{#3}}{}{{}^{#3}}}}
%\newcommand{\unit     }[2]{\ensuremath{\cdot\text{#1}\ifthenelse{\isempty{#2}}{}{{}^{#2}}}}
%{\texorpdfstring{\ensuremath{\cdot\text{\directlua{tex.print(unit2string([[#1]], false))}}\ifthenelse{\isempty{#2}}{}{{}^{#2}}}}{·\directlua{tex.print(unit2string([[#1]], false))}#2}}
%\newcommand{\UNIT     }[2]{\ensuremath{\cdot\text{\directlua{tex.print(unit2string([[#1]], false))}}^{#2}}}
%  \ifthenelse
%    {\isempty{#2}}
%    {123}
%    {123}
%    %{\ensuremath{\cdot\text{\acrshort{#1}}}}
%    %{\ensuremath{\cdot\text{\acrshort{#1}}}}
%\input{\source/tex/square_roots.def}
% New definition of square root:
% it renames \sqrt as \oldsqrt
%\let\oldsqrt\sqrt
% it defines the new \sqrt in terms of the old one
%\def\sqrt{\mathpalette\DHLhksqrt}
%\def\DHLhksqrt#1#2{%
%\setbox0=\hbox{$#1\oldsqrt{#2\,}$}\dimen0=\ht0
%\advance\dimen0-0.2\ht0
%\setbox2=\hbox{\vrule height\ht0 depth -\dimen0}%
%{\box0\lower0.4pt\box2}}