Eric S Fraga <esfli...@gmail.com> writes:
> On Friday, 28 Sep 2018 at 11:39, Christian Moe wrote:
>> Hi,
>>
>> I am trying to generate a PNG file with a TikZ picture from a LaTeX src
>> block, looking at instructions here:
>> https://orgmode.org/worg/org-contrib/babel/languages/ob-doc-LaTeX.html
>>
>> I try this:
>>
>> #+header: :file "tikzpic.png" :fit yes :results raw file :exports results
>> :headers '("\\usepackage{tikz}")
>> #+begin_src latex
>> \begin{tikzpicture}
>> \draw [fill=green] (0,4) -- (3,0) -- (-3,0) -- cycle;
>> \end{tikzpicture}
>> #+end_src
It seems that the function `org-babel-execute:latex' ignores the
property :headers under certain circumstances. Therefore the line
"\usepackage{tikz}" will be missing in your resulting latex document.
The property is not ignored if you also append the property
":imagemagick t" to the #+header line. So you can use the following
header as a fix (for another fix, see below):
#+header: :file "tikzpic.png" :fit yes :results raw file :exports results
:headers '("\\usepackage{tikz}") :imagemagick t
I've drafted a patch that fixes the issue. I would appreciate if some
maintainer could have a look and comment, or apply the patch:
>From a54f83d2b411ae58941c32cb23fd47f38e70dc80 Mon Sep 17 00:00:00 2001
From: Benjamin Motz <benjamin.m...@mailbox.org>
Date: Fri, 28 Sep 2018 16:32:59 +0200
Subject: [PATCH 1/2] Fix ob-latex to respect the keyword :headers
This adds support for property :headers in org-format-latex-options.
TINYCHANGE
---
lisp/ob-latex.el | 8 ++++++--
lisp/org.el | 3 +++
2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/lisp/ob-latex.el b/lisp/ob-latex.el
index 8d037090e..19e44dee5 100644
--- a/lisp/ob-latex.el
+++ b/lisp/ob-latex.el
@@ -108,8 +108,12 @@ This function is called by `org-babel-execute-src-block'."
(append (cdr (assq :packages params)) org-latex-packages-alist)))
(cond
((and (string-suffix-p ".png" out-file) (not imagemagick))
- (org-create-formula-image
- body out-file org-format-latex-options in-buffer))
+ (let ((latex-options (copy-tree org-format-latex-options)))
+ (when headers
+ (plist-put latex-options :headers
+ (append (plist-get latex-options :headers) headers)))
+ (org-create-formula-image
+ body out-file latex-options in-buffer)))
((string-suffix-p ".tikz" out-file)
(when (file-exists-p out-file) (delete-file out-file))
(with-temp-file out-file
diff --git a/lisp/org.el b/lisp/org.el
index f3a19d643..d2ff4e41c 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -18571,6 +18571,9 @@ a HTML file."
(if (string= bg "Transparent") "white" bg))))
(with-temp-file texfile
(insert latex-header)
+ (when-let ((headers (plist-get options :headers)))
+ (dolist (h headers)
+ (insert h)))
(insert "\n\\begin{document}\n"
"\\definecolor{fg}{rgb}{" fg "}\n"
"\\definecolor{bg}{rgb}{" bg "}\n"
--
2.18.0
> This works for me, cutting and pasting exactly what you have posted into a
> small org file.
You probably have "\\usepackage{tikz}" set in your variable
`org-format-latex-header' (another fix for the issue).
> Output from my *Messages* buffer:
> ,----
> | Wrote /tmp/x.org
> | org-babel-exp process latex at position 128...
> | Evaluate this latex code block on your system? (y or n) y
> | executing Latex code block...
> | (Shell command succeeded with no output)
> | Code block evaluation complete.
> | Local Ispell dictionary set to british
> | Saving file /tmp/x.tex...
> `----
> when I export to LaTeX. What does your message log say?
Actually, the output looks identical when the command indeed fails to
run latex without errors - the output file is generated nonetheless and
the user thinks everything is ok. I'd suggest to add '-halt-on-error' to
avoid creating an output file. This will then signal an error to the
user. A possible patch is appended:
>From 9f08a34c7eddfea394b9a1e78d54b3b26b139b51 Mon Sep 17 00:00:00 2001
From: Benjamin Motz <benjamin.m...@mailbox.org>
Date: Sat, 29 Sep 2018 22:15:39 +0200
Subject: [PATCH 2/2] preview-latex: don't produce output file on error
This will result in an error-message visible to the user. Otherwise,
the user might just assume that everything went ok, even though there
were issues when creating the output file.
TINYCHANGE
---
lisp/org.el | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/lisp/org.el b/lisp/org.el
index d2ff4e41c..0c7358eb0 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -3939,7 +3939,7 @@ All available processes and theirs documents can be found in
:image-input-type "dvi"
:image-output-type "png"
:image-size-adjust (1.0 . 1.0)
- :latex-compiler ("latex -interaction nonstopmode -output-directory %o %f")
+ :latex-compiler ("latex -interaction nonstopmode -halt-on-error -output-directory %o %f")
:image-converter ("dvipng -fg %F -bg %B -D %D -T tight -o %O %f"))
(dvisvgm
:programs ("latex" "dvisvgm")
@@ -3949,7 +3949,7 @@ All available processes and theirs documents can be found in
:image-input-type "dvi"
:image-output-type "svg"
:image-size-adjust (1.7 . 1.5)
- :latex-compiler ("latex -interaction nonstopmode -output-directory %o %f")
+ :latex-compiler ("latex -interaction nonstopmode -halt-on-error -output-directory %o %f")
:image-converter ("dvisvgm %f -n -b min -c %S -o %O"))
(imagemagick
:programs ("latex" "convert")
@@ -3959,7 +3959,7 @@ All available processes and theirs documents can be found in
:image-input-type "pdf"
:image-output-type "png"
:image-size-adjust (1.0 . 1.0)
- :latex-compiler ("pdflatex -interaction nonstopmode -output-directory %o %f")
+ :latex-compiler ("pdflatex -interaction nonstopmode -halt-on-error -output-directory %o %f")
:image-converter
("convert -density %D -trim -antialias %f -quality 100 %O")))
"Definitions of external processes for LaTeX previewing.
--
2.18.0
Best regards,
Benjamin
