org-reader: Parse image and table label

[michelk]

• The org-reader does not read the image and table label.
• Cross-references are not rendered correctly.

cc @tarleb

Minimal example

Org-file:

As illustrated in figure [[fig:myfig]], ... and listed in table [[tab:mytab]]

#+CAPTION: My figure.
#+LABEL: fig:myfig
[[blub.png]]


#+CAPTION: My table.
#+LABEL: tab:mytab
 | Name | Value |
 |------+-------|
 | Uno  |     1 |
 | Due  |     2 |

Expected Latex

As illustrated in figure \ref{fig:myfig}, \ldots{} and listed in table
\ref{tab:mytab}

\begin{figure}[htbp]
\centering
\includegraphics{blub.png}
\caption{My figure}
\label{fig:myfig}
\end{figure}

\begin{longtable}[]{@{}ll@{}}
\caption{My table}\label{tab:mytab}\tabularnewline
\toprule
Name & Value\tabularnewline
\midrule
\endfirsthead
\toprule
Name & Value\tabularnewline
\midrule
\endhead
Uno & 1\tabularnewline
Due & 2\tabularnewline
\bottomrule
\end{longtable}

Actual latex

As illustrated in figure \url{fig:myfig}, \ldots{} and listed in table
\url{tab:mytab}

\begin{figure}[htbp]
\centering
\includegraphics{blub.png}
\caption{My figure}
\end{figure}

\begin{longtable}[]{@{}ll@{}}
\caption{My table}\tabularnewline
\toprule
Name & Value\tabularnewline
\midrule
\endfirsthead
\toprule
Name & Value\tabularnewline
\midrule
\endhead
Uno & 1\tabularnewline
Due & 2\tabularnewline
\bottomrule
\end{longtable}

[tarleb]

Thanks for the report. This is a duplicate of #2496, though info in that threat is obsolete.

PR #3001 adds labels for figures. Labeling tables is not possible at the moment. (@jgm, please correct me if I'm wrong.)

[jgm]

Closing in favor of #2496

[michelk]

Org-mode

As seen in fig. [[fig:1]]

Translates to latex:

As seen in fig. \url{fig:1}

I would expect

As seen in fig. \ref{fig:1}

Is it possible to fix this in the org-reader?

[tarleb]

Unfortunately this is not a simple change. It requires, among other things, changes to pandoc's internal document model, which is always a lot of work. See also #1299.

[jgm]

I suppose the org reader could keep an internal count of
figure numbers, and insert the figure number as the
link text here. That wouldn't require any changes to
pandoc-types at all.

+++ Albert Krewinkel [Oct 05 16 11:12 ]:

Unfortunately this is not a simple change. It requires, among other
things, changes to pandoc's internal document model, which is always a
lot of work. See also [1]#1299.

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References

1. Support for anchors #1299
2. org-reader: Parse image and table label #2999 (comment)
3. https://github.com/notifications/unsubscribe-auth/AAAL5NpKaYfXJtkx0XMWIkAuNE0MLU47ks5qw-iRgaJpZM4I-hHA

[tarleb]

I'm probably being dense here again, but I don't see how this would work. From a quick grep it seems to me that the LaTeX writer won't output \ref no matter what. Am I misunderstanding something?

[michelk]

I guess John means, that the org-reader could parse [[fig:1]] as a literal 1.

But this approach fails for example when outputting a LaTeX report, where this could be 1.1

[michelk]

Meanwhile I would be happy with this workaround.

[jgm]

+++ Michel Kuhlmann [Oct 06 16 23:19 ]:

I guess John means, that the org-reader could parse [[fig:1]] as a
literal 1.

But this approach fails for example when outputting a LaTeX report,
where this could be 1.1

Correct, but this is the best we could achieve with just
changes in the org reader. A better solution would require
a complete (and probably complex) label/reference system in
pandoc.

[michelk]

Any update with the numbering workaround?

[michelk]

Or would you recommend a lua-filter?

[tarleb]

Apologies, I'm currently short on time and cannot work on this right now.

I believe a filter-based solution should be possible. Allowing lua filters to use a hierarchicalized version of the AST would probably help here (and would make the solution for tarleb/pandoc-org-presentations#1 much simpler).

[michelk]

Is there any update with table-labels in the org-mode reader?

 #+CAPTION:  My caption.
 #+LABEL: tab:mytable
|      Year | Topic                                    |
|-----------+--------------------------------------|

\label{tab:mytable} still doesn't show up in latex.

[tarleb]

Looks like a shortcoming of the LaTeX writer. Please open a new issue for this.

[michelk]

I'm unsure, what to describe in the new issue. Should I just reference to this issue?

[michelk]

Another question (maybe off-topic here):

How could I pass image-width to LaTeX? ATTR_HTML or ATTR_LATEX doesn't seem to work.

#+CAPTION: My figure.
#+LABEL: fig:myfig
#+ATTR_HTML: :width \textwidth
[[blub.png]]

[tarleb]

The pandoc-discuss mailing list would probably be a better place for these questions.

Re image width: use #+ATTR_HTML: :width 100%

Re labels on LaTeX tables: I've opened #8219 to keep track of the issue.