Correction and addition [Re: BUG: the builtin LaTeX/P DF exporter mislabels source blocks as figures.]

[Emmanuel Charpentier <emm.charpentier@free.fr>]

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I reported incorrectly that the bug Ireported was also present when
using the "minted" package to format source blocks.

This is incorrect : I re-checked my trials, and re-wrote another test,
which gives the ecpected result. See attached files.

This might help pinpointing the problem happening when minted is *NOT*
used.

HTH,

--
Emmanuel Charpentier

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# An archi-minimal test of source blocks labelling,
# using only the built-in tools.

#+options: tex:t title:nil author:nil date:nil toc:nil
#+title: Test of source block exports

#+begin_src emacs-lisp :exports none :results none
  (setq
   org-latex-pdf-process
   (list "latexmk -pdf -pdflatex='%latex -interaction=nonstopmode -shell-escape' -bibtex -f %f")
   org-latex-listings 'minted)
  (add-to-list 'org-latex-packages-alist '("newfloat" "minted" t))
#+end_src

# #+latex_header: \usepackage[newfloat]{minted}
# #+latex_header: \usepackage{listings}

The Python block [[lst:DoFig]] generates the figure [[fig:DoFig]]

#+name: DoFig
#+begin_src python :results file :exports none
import matplotlib, numpy
matplotlib.use('Agg')
import matplotlib.pyplot as plt
fig=plt.figure(figsize=(4,2))
x=numpy.linspace(-15,15)
plt.plot(numpy.sin(x)/x)
fig.tight_layout()
plt.savefig('Fig2.png')
return 'Fig2.png'
#+end_src

#+RESULTS: DoFig
[[file:Fig2.png]]

#+name: fig:DoFig
#+caption: Figure generated by python
#+ATTR_LATEX: :height 2.5in
[[file:Fig2.png]]

# #+name: fig:DoFig
# #+caption: Figure generated by python
# #+RESULTS: DoFig
# [[file:Fig2.png]]


#+name: lst:DoFig
#+caption: Python code generating a figure
#+begin_src python :eval no :exports code :noweb yes
<<DoFig>>
#+end_src

Problem: whereas the HTML export labels the source listing as "Listing 1" and is correctly refers to 1, the PDF export labels it "Figure 2" (and points to it) *when the default ~verbatim~ method is used.* When one bothers to use ~minted~, the result is correct.

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% Created 2019-04-30 mar. 23:15
% Intended LaTeX compiler: pdflatex
\documentclass[11pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{graphicx}
\usepackage{grffile}
\usepackage{longtable}
\usepackage{wrapfig}
\usepackage{rotating}
\usepackage[normalem]{ulem}
\usepackage{amsmath}
\usepackage{textcomp}
\usepackage{amssymb}
\usepackage{capt-of}
\usepackage{hyperref}
\usepackage[newfloat]{minted}
\date{}
\title{Test of source block exports}
\hypersetup{
 pdfauthor={Emmanuel Charpentier},
 pdftitle={Test of source block exports},
 pdfkeywords={},
 pdfsubject={},
 pdfcreator={Emacs 26.1 (Org mode 9.2.3)}, 
 pdflang={English}}
\begin{document}

The Python block \ref{org471e7a4} generates the figure \ref{fig:orgb0ae5e3}

\begin{figure}[htbp]
\centering
\includegraphics[height=2.5in]{Fig2.png}
\caption{\label{fig:orgb0ae5e3}
Figure generated by python}
\end{figure}


\begin{listing}[htbp]
\begin{minted}[]{python}
import matplotlib, numpy
matplotlib.use('Agg')
import matplotlib.pyplot as plt
fig=plt.figure(figsize=(4,2))
x=numpy.linspace(-15,15)
plt.plot(numpy.sin(x)/x)
fig.tight_layout()
plt.savefig('Fig2.png')
return 'Fig2.png'
\end{minted}
\caption{\label{org471e7a4}
Python code generating a figure}
\end{listing}

Problem: whereas the HTML export labels the source listing as "Listing 1" and is correctly refers to 1, the PDF export labels it "Figure 2" (and points to it) \textbf{when the default \texttt{verbatim} method is used.} When one bothers to use \texttt{minted}, the result is correct.
\end{document}

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