robustize-figures.tex

\let\StandardIncludeGraphics\includegraphics

%==========================================
% CREDITS: https://tex.stackexchange.com/a/567990/221054
\makeatletter
\newif\ifgraphicexist
\catcode`\*=11
\newcommand\imagetest[1]{%
	\begingroup
		\global\graphicexisttrue
		\ifx\detokenize\@undefined\else
			\edef\Gin@extensions{\detokenize\expandafter{\Gin@extensions}}%
		\fi
		\let\input@path\Ginput@path
		\set@curr@file{#1}%
		\expandafter\filename@parse\expandafter{\@curr@file}%
		\ifx\filename@ext\Gin@gzext
			\expandafter\filename@parse\expandafter{\filename@base}%
			\ifx\filename@ext\relax
				\let\filename@ext\Gin@gzext
			\else
				\edef\Gin@ext{\Gin@ext\Gin@sepdefault\Gin@gzext}%
			\fi
		\fi
		\ifx\filename@ext\relax
			\@for\Gin@temp:=\Gin@extensions\do{%
				\ifx\Gin@ext\relax
					\Gin@getbase\Gin@temp
				\fi}%
		\else
			\Gin@getbase{\Gin@sepdefault\filename@ext}%
			\ifx\Gin@ext\relax
				\global\graphicexistfalse
				\let\Gin@savedbase\filename@base
				\let\Gin@savedext\filename@ext
				\edef\filename@base{\filename@base\Gin@sepdefault\filename@ext}%
				\let\filename@ext\relax
				\@for\Gin@temp:=\Gin@extensions\do{%
					\ifx\Gin@ext\relax
						\Gin@getbase\Gin@temp
					\fi}%
					\ifx\Gin@ext\relax
						\let\filename@base\Gin@savedbase
						\let\filename@ext\Gin@savedext
					\fi
				\fi
				\ifx\Gin@ext\relax
					\global\graphicexistfalse
					\def\Gin@base{\filename@area\filename@base}%
					\edef\Gin@ext{\Gin@sepdefault\filename@ext}%
				\fi
		\fi
		\ifx\Gin@ext\relax
			\global\graphicexistfalse
		\else
		\@ifundefined{Gin@rule@\Gin@ext}%
			{\global\graphicexistfalse}%
			{}%
		\fi
		\ifx\Gin@ext\relax
			\gdef\imageextension{unknown}%
		\else
			\xdef\imageextension{\Gin@ext}%
		\fi
	\endgroup
	\ifgraphicexist
		\expandafter \@firstoftwo
	\else
		\expandafter \@secondoftwo
	\fi
}
\catcode`\*=12
\makeatother
%==========================================

\newcommand{\shrug}{\texttt{\raisebox{0.75em}{\char`\_}\char`\\\char`\_\kern-0.5ex(\kern-0.25ex\raisebox{0.25ex}{\rotatebox{45}{\raisebox{-.75ex}"\kern-1.5ex\rotatebox{-90})}}\kern-0.5ex)\kern-0.5ex\char`\_/\raisebox{0.75em}{\char`\_}}}


\renewcommand{\includegraphics}[2][]{%
%
\imagetest{#2}{
	\StandardIncludeGraphics[#1]{#2}
}{
	\ClassWarning{robustize-figures}{Figure #2 does not exist -- but robust mode is activated, so I am going to replace this with a placeholder}
	\noindent\colorbox{gray!20}{
	\begin{minipage}[t][4.2cm][t]{0.8\textwidth}
		\vspace*{\fill}
		\centering
		Missing figure

		\texttt{#2}

		\medskip

		\tikzifintikzpicture{(-:}{\shrug}
		\vspace*{\fill}
	\end{minipage}}
}
}