% Usage: \fig{<path-to-file>}{<label>}{<caption>}
\newcommand{\fig}[4][]{
\begin{figure}[h!]
    \centering
    \includegraphics[width=0.8\columnwidth]{#2}
	%
    \sbox0{#1}%
	\ifdim\wd0=0pt
		{\caption{#4}} %if #1 is empty
	\else
		{\caption{#4\\\texttt{{\scriptsize #1}}}}
	\fi
    %
    \label{fig:#3}
\end{figure}
}


% Usage:
\newcommand{\xkcd}[2]{\fig{xkcd/#1}{#1}{#2\\%
{\tiny\MakeUppercase{https://imgs.xkcd.com/comics/#1.png}\hskip3mm%
License: \texttt{\href{https://creativecommons.org/licenses/by-nc/2.5/}{CC BY-NC 2.5}}}%
}}


% Usage:
\newcommand{\wikicommons}[2][]{\fig{wikimediacommons/#2}{#2}{#1\\%
{\tiny\href{https://commons.wikimedia.org/wiki/File:#2.svg}{\MakeUppercase{https://commons.wikimedia.org/wiki/File:#2.svg}}\hskip3mm%
License: \texttt{\href{https://creativecommons.org/licenses/by-sa/3.0/}{CC BY-SA 3.0}}}%
}}


% Usage:
\newcommand{\notice}[2]{%
    \shadowbox{%
        \begin{varwidth}{0.85\linewidth}
            \texttt{\textbf{#1}}\\
            #2
        \end{varwidth}
    }
}


% Usage:
\newcommand{\cliline}[2][]{\lstinline[columns=fixed,#1]{#2}}


% Usage:
\newcommand{\utccurrenttime}[0]{%
    \today%
    T%
    \DTMcurrenttime%
    \DTMfetchTZhour{now}%
    :%
    \DTMfetchTZminute{now}
}


% Usage:
\newcommand{\itemhead}[2][]{%
	\sbox0{#1}%
	\ifdim\wd0=0pt
		{\textbf{#2:}} %if #1 is empty
	\else
		{\textbf{#2:}\\{\footnotesize #1}}
	\fi
}


% Usage:
\newcommand{\itemtitle}[2]{%
	\sbox0{#1}%
	\ifdim\wd0=0pt
		{\itemhead{#1}} %if #2 is empty
	\else
		{\itemhead[#2]{#1}}
	\fi
}


% Usage:
\newcommand{\myquote}[2]{%
    \sbox0{#1}%
    \ifdim\wd0=0pt
        {\epigraph{#2}{\textit{{\tiny \theauthor}}}} %if #1 is empty
    \else
        {\epigraph{#2}{\textit{#1}}} %if quote is cited
    \fi    
}


% Usage:
% Enviroment @var txt
% changes code styling to: in frame, white bg.
\lstnewenvironment{txt}{\lstset{style=plaintxt}}{}



% Usage:
% Enviroment @var cisco
\lstnewenvironment{cisco}{\lstset{language=cisco}}{}


% Usage:
\newcommand{\txtreflect}[1]{\reflectbox{#1}}


% Usage:
\newcommand{\txtupdown}[1]{\raisebox{\depth}{\rotatebox{270}{\reflectbox{\rotatebox{90}{#1}}}}}


% Usage: used in similair manner as itemize --> \begin{rules} then \end{rules}
% http://www.troubleshooters.com/linux/lyx/ownlists.htm
\newenvironment{rules}{
    \begin{list}%
    {\bfseries{}§\hskip1mm\arabic{qcounter}:~}%
    {
        \usecounter{qcounter}
        \bfseries
        \setlength\labelwidth{1in}
        \setlength\labelsep{0.27in}
        \setlength\leftmargin{0.56in}
        \setlength\listparindent{1in}
        \setlength\itemindent{0.1in}
    }
}{
    \end{list}
}


% Usage:
\newcommand{\rfc}[1]{RFC #1\footnote{\href{https://tools.ietf.org/html/rfc#1}{tools.ietf.org/html/rfc#1}}}


% Usage: \note{<text>} or \nb{<text>}
\newcommand{\note}[1]{{\color{Mahogany!20!black}{\small(#1)}}}
\newcommand{\nb}[1]{\note{#1}}


% Usage:
% https://tex.stackexchange.com/a/75349
\newcommand{\plaintextinput}[1]{\lstinputlisting[language={},style=plaintxt]{code/#1.txt}}