Generate a list of figure numbers and filenames from \includegraphics

Question

For a book project with lots of figures, I need to generate a list of the filenames of all figures included via includegraphics{} and their figure numbers. Something like:

1.1 ch01-intro/fig/lascaux.jpg
1.2 ch01-intro/fig/plot-weather-new.png
1.3 ch01-intro/fig/huygens1669.png
1.4 ch01-intro/fig/priestley-chart-biography-edit.png

There is a perl script on CTAN, texdepend, that will find the filenames, but it doesn't necessarily list them in order and doesn't grok the figure numbers. (It was designed for generating a Makefile, or preparing a ZIP file for a LaTeX project.)

> texdepend -format=1 -print=f TOGS.tex |head
# C:\batchfiles\texdepend.pl, v0.96 (Michael Friendly (friendly@yorku.ca))
# commandline: C:\batchfiles\texdepend.pl -format=1 -print=f TOGS.tex
# FIGS =
ch05-playfair/fig/playfair1805-inquiry-crop.jpg
ch01-intro/fig/lascaux.jpg
ch01-intro/fig/plot-weather-new.png
ch01-intro/fig/huygens1669.png
ch01-intro/fig/priestley-chart-biography-edit.png
ch01-intro/fig/marey-trains.png
ch01-intro/fig/Minard-cotton3.png

Similar questions have be asked here and there but none have the requirement of including the figure numbers.

Wanted: A way to modify includegraphics itself so that it also writes lines to an external file, of the form

fignum filename

One small complication is that a given begin{figure} environment can contain two or more \includegraphics commands, for example:

\begin{figure}[htb]
    \centering
    \includegraphics[width=.49\textwidth]{\theChapter/fig/galton-interp2}
    \includegraphics[width=.49\textwidth]{\theChapter/fig/galton-interp3}
    \caption{A reconstruction of Galton's method for finding contours of
        approximately equal frequency in the relationship between heights of parents
        and their children. 
    }%
    \label{fig:galton-interp2}
\end{figure}

If this generates Fig. 6.16, the result should look like

6.16 ch06-scat/fig/galton-interp2.png
6.16 ch06-scat/fig/galton-interp3.png

The redefinition of the \includegraphics macro is not the real problem concerning the writing of the figure number and the file name, but determination of the figure number itself which is increased by \caption which is done later than \includegraphics here, unless you use it before... — , Sep 20 '17 at 20:04
There is another, more difficult, problem here: includegraphics() by itself, doesn't have access to the filename extensions-- they could be .png, .jpg or pdf for pdflatex. — user101089, Sep 21 '17 at 02:20

score 2 · Accepted Answer · 2017-09-21T07:22:10.257

This redefines \includegraphics by adding more code at the end, artifically increasing the figure number (within a group) and writing to a ToC like file with \addtocontents to have the benefit of the ToC mechanism with the \tf@... file handles.

The file will be named \jobname.lfn and is only written if \listoffigurenumbernames is used.

Remove the demo option for the real use - case, I put it in there since I don't have the various graphics files on my disk.

\documentclass{book}


\usepackage{xparse}
\usepackage[demo]{graphicx}
\usepackage{letltxmacro}


\LetLtxMacro\davidsincludegraphics\includegraphics

\makeatletter
\RenewDocumentCommand{\includegraphics}{O{}m}{%
  \davidsincludegraphics[#1]{#2}%
  \begingroup
  \advance\c@figure by \@ne
  \addtocontents{lfn}{\thefigure\space #2}
  \endgroup
}

\def\@starttocbutdonotshowit#1{%
  \begingroup
    \makeatletter
    \if@filesw
      \expandafter\newwrite\csname tf@#1\endcsname
      \immediate\openout \csname tf@#1\endcsname \jobname.#1\relax
    \fi
    \@nobreakfalse
  \endgroup}


\newcommand{\listoffigurenumbernames}{%
  \@starttocbutdonotshowit{lfn}%
}

\begin{document}
\listoffigurenumbernames

\chapter{First}

\begin{figure}[htb]
    \centering
    \includegraphics[width=.49\textwidth]{\thechapter/fig/galton-interp2}
    \includegraphics[width=.49\textwidth]{\thechapter/fig/galton-interp3}
    \caption{A reconstruction of Galton's method for finding contours of
        approximately equal frequency in the relationship between heights of parents
        and their children. 
    }%
    \label{fig:galton-interp2}
\end{figure}


\begin{figure}[htb]
    \centering
    \includegraphics[width=.49\textwidth]{\thechapter/fig/galton-interp4}
    \includegraphics[width=.49\textwidth]{\thechapter/fig/galton-inter5}
    \caption{A reconstruction of Galton's method for finding contours of
        approximately equal frequency in the relationship between heights of parents
        and their children. 
    }%
    \label{fig:galton-interp4}
\end{figure}

\chapter{Second}

\begin{figure}[htb]
    \centering
    \includegraphics[width=.49\textwidth]{\thechapter/fig/galton-interp6}
    \includegraphics[width=.49\textwidth]{\thechapter/fig/galton-inter7}
    \caption{A reconstruction of Galton's method for finding contours of
        approximately equal frequency in the relationship between heights of parents
        and their children. 
    }%
    \label{fig:galton-interp5}
\end{figure}


\end{document}

This gives

1.1 1/fig/galton-interp2
1.1 1/fig/galton-interp3
1.2 1/fig/galton-interp4
1.2 1/fig/galton-inter5
2.1 2/fig/galton-interp6
2.1 2/fig/galton-inter7

Improved version

With 'heuristic' determination of file extension for .jpg, .pdf or .pdf

The \includegraphics macro has a 4th optional argument which can be used in order to override the file extension.

\documentclass{book}


\usepackage{xparse}
\usepackage{graphicx}
\usepackage{letltxmacro}


\LetLtxMacro\davidsincludegraphics\includegraphics

\makeatletter

\RenewDocumentCommand{\includegraphics}{sO{}mo}{%
  \IfBooleanTF{#1}{%
    \davidsincludegraphics*[#2]{#3}%
  }{%
    \davidsincludegraphics[#2]{#3}%
  }%
  \begingroup
  % Trying to determine the extension
  \def\loc@l@ext{}
  \IfValueTF{#4}{%
    \def\loc@l@ext{#4}%
  }{%
    \IfFileExists{#3}{%
    }{%
      \IfFileExists{#3.pdf}{%
        \edef\loc@l@ext{.pdf}%
      }{%
        \IfFileExists{#3.jpg}{%
          \edef\loc@l@ext{.jpg}%
        }{%
          \edef\loc@l@ext{.png}%
        }%
      }%
    }%
  }%
  \advance\c@figure by \@ne
  \addtocontents{lfn}{\thefigure\space #3\loc@l@ext}
  \endgroup
}

\def\@starttocbutdonotshowit#1{%
  \begingroup
    \makeatletter
    \if@filesw
      \expandafter\newwrite\csname tf@#1\endcsname
      \immediate\openout \csname tf@#1\endcsname \jobname.#1\relax
    \fi
    \@nobreakfalse
  \endgroup}


\newcommand{\listoffigurenumbernames}{%
  \@starttocbutdonotshowit{lfn}%
}



\begin{document}
\listoffigurenumbernames

\chapter{First}

\begin{figure}[htb]
    \centering
    \includegraphics[width=.49\textwidth]{galton-interp2}[.png]
    \includegraphics[width=.49\textwidth]{galton-interp3}
    \caption{A reconstruction of Galton's method for finding contours of
        approximately equal frequency in the relationship between heights of parents
        and their children. 
    }%
    \label{fig:galton-interp2}
\end{figure}


\begin{figure}[htb]
    \centering
    \includegraphics[width=.49\textwidth]{galton-interp4}
    \includegraphics[width=.49\textwidth]{galton-inter5}
    \caption{A reconstruction of Galton's method for finding contours of
        approximately equal frequency in the relationship between heights of parents
        and their children. 
    }%
    \label{fig:galton-interp4}
\end{figure}

\chapter{Second}

\begin{figure}[htb]
    \centering
    \includegraphics[width=.49\textwidth]{galton-interp6}
    \includegraphics[width=.49\textwidth]{galton-inter7}
    \caption{A reconstruction of Galton's method for finding contours of
        approximately equal frequency in the relationship between heights of parents
        and their children. 
    }%
    \label{fig:galton-interp5}
\end{figure}


\end{document}

Excellent! I didn't think it would be that easy to solve the file extension problem. — user101089, Sep 21 '17 at 13:03
@user101089: yes, but a nested test with \IfFileExists is really tedious. Luckily there are only three possible extensions ;-) — , Sep 21 '17 at 17:19

Generate a list of figure numbers and filenames from \includegraphics

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