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<span style="color: #9e9e9e;">#+title:</span> <span style="color: #29838d; font-weight: 700;">June 2021
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</span><span style="color: #9e9e9e;">#+subtitle:</span> <span style="color: #29838d;">A relaxed month
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</span><span style="color: #9e9e9e;">#+author:</span> <span style="color: #29838d;">TEC
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</span><span style="color: #9e9e9e;">#+date:</span> <span style="color: #29838d;">2021-06-34
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</span>
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The previous two months have been pretty good for Org development --- with many
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bug fixes and feature improvements. This month has been substantially slower
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than the last<span style="color: #ac4426;">[fn:1]</span>, but that's not to say not much is happening: in fact, there are
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some rather nifty contributions lined up for the not-too-distant future and a
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certain long-awaited feature branch<span style="color: #ac4426;">[fn:2]</span> is getting very close to merging 😀.
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You'll just have to stick around to hear about those in a future edition of TMIO 😉.
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<span style="color: #b6b6b6;">#+caption:</span> <span class="ef-ob">It's right around the corner, I swear!</span>
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<span style="color: #b6b6b6;">#+attr_html: :class invertible</span>
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<span style="color: #3b6ea8; font-weight: 700;">[[file:figures/dilbert-zenos-paradox.jpg]]</span>
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<span style="color: #3b6ea8; font-weight: 700;">* Customise the reference command used in LaTeX</span>
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Previously, whenever you linked to another part of your document (with or
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without giving it a name) --- for example with <span style="color: #4f894c;">=</span><span style="color: #4f894c; font-weight: 700;">[[Profound section]]</span><span style="color: #4f894c;">=</span> or similar
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--- when exporting to LaTeX Org would <span style="text-decoration: italic;">/always/</span> use the <span style="color: #4f894c;">=\ref=</span> command.
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<span style="color: #b6b6b6;">#+caption:</span> <span class="ef-ob">A LaTeX export of a simple document with a reference to both the first and second section.</span>
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<span style="color: #b6b6b6;">#+caption:</span> <span class="ef-ob">"2" what? Section 2, Table 2, Figure 2, ...</span>
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<span style="color: #b6b6b6;">#+attr_html: :class invertible</span>
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<span style="color: #3b6ea8; font-weight: 700;">[[file:figures/org-latex-default-reference-to-sec.png]]</span>
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You can now set the format string <span style="color: #ac4426;">~org-latex-reference-command~</span> (<span style="color: #4f894c;">=\\ref{%s}=</span> by
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default) to anything you'd like. For example, making use of the <span style="color: #3b6ea8; font-weight: 700;">[[https://ctan.org/pkg/cleveref][cleveref]]</span> package
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I can set this to <span style="color: #4f894c;">=\\cref{%s}=</span> and then add <span style="color: #9e9e9e;">src_</span><span style="color: #b6b6b6;">elisp</span><span style="color: #9e9e9e;">{</span><span class="ef-ob">(</span><span style="color: #4f894c;">"capitalize"</span> <span style="color: #4f894c;">"cleveref"</span><span class="ef-ob">
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nil)</span><span style="color: #9e9e9e;">}</span><span style="color: #ac4426;">[fn:3]</span> to <span style="color: #ac4426;">~org-latex-packages-alist~</span>.
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<span style="color: #b6b6b6;">#+caption:</span> <span class="ef-ob">A LaTeX export of the same document, but now using ~cleveref~. Note the change from "1" and "2" to "Section 1" and "Section 2".</span>
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<span style="color: #b6b6b6;">#+attr_html: :class invertible</span>
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<span style="color: #3b6ea8; font-weight: 700;">[[file:figures/org-latex-cref-reference-to-sec.png]]</span>
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<span style="color: #3b6ea8; font-weight: 700;">* A diversion into writing Org for LaTeX</span>
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Speaking of LaTeX exports, a member of the Org mailing list recently told us
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about <span style="color: #3b6ea8; font-weight: 700;">[[https://arxiv.org/abs/2106.05096][a paper]]</span> pushed to <span style="color: #3b6ea8; font-weight: 700;">[[https://arxiv.org/][arXiv]]</span> which was written <span style="text-decoration: italic;">/entirely/</span> in Org. Why don't we
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use that as a prompt to talk a bit about generating LaTeX documents from Org?
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For an experienced LaTeX-er, Org may initially appear best suited to simple
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documents, but in fact it's possible to reproduce any LaTeX structure in Org
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with no more difficulty (often less) than in LaTeX.
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<span style="color: #97365b; font-weight: 700;">** Simple elements</span>
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The "basic" Org elements are simply translated to their LaTeX counterparts.
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Markup like <span style="font-weight: 700;">*bold*</span>, <span style="text-decoration: italic;">/italic/</span>, etc. are simply translated through
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<span style="color: #ac4426;">~org-latex-text-markup-alist~</span>.
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For those of us who dabble with equations, Org is <span style="color: #3b6ea8; font-weight: 700;">[[https://orgmode.org/manual/LaTeX-fragments.html][very accomodating]]</span>. You can
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type (LaTeX-style) inline and display equations in exactly the same way (<span style="color: #4f894c;">=\( \)=</span>
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and <span style="color: #4f894c;">=\[ \]=</span>), and what's more, if you have a LaTeX environment statement
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<span style="color: #4f894c;">=\begin{...}=</span> on its own line, Org will recognise it and pass it into the
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generated LaTeX.
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<span style="color: #97365b; font-weight: 700;">** Figures and tables</span>
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One area where the improvement when moving to Org is particularly apparent is
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with figures and tables. To simply include an image, an image link alone is
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sufficient.
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<span style="color: #b1b1b1;">#+begin_src org
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</span><span style="color: #3b6ea8; font-weight: 700;">[[file:figures/salvador-dali-persistence-of-memory.jpg]]</span>
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<span style="color: #b1b1b1;">#+end_src
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</span>When exported to LaTeX this will be expanded to
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<span style="color: #b1b1b1;">#+begin_src LaTeX
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</span><span style="color: DimGray;">\includegraphics</span><span class="ef-ob">[width=.9</span><span style="color: DimGray;">\linewidth</span><span class="ef-ob">]{figures/salvador-dali-persistence-of-memory.jpg}
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</span><span style="color: #b1b1b1;">#+end_src
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</span>
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As soon as you add a <span style="color: #4f894c;">=#+caption=</span>, though, Org knows you mean business and
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generates a <span style="text-decoration: italic;">/proper/</span> figure.
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<span style="color: #b1b1b1;">#+begin_src org
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</span><span class="ef-ob">,#+caption: A famous surrealist painting
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</span><span style="color: #3b6ea8; font-weight: 700;">[[file:figures/salvador-dali-persistence-of-memory.jpg]]</span>
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<span style="color: #b1b1b1;">#+end_src
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</span><span style="color: #b1b1b1;">#+begin_src LaTeX
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</span><span style="color: #3b6ea8;">\begin</span><span class="ef-ob">{</span><span style="color: #29838d;">figure</span><span class="ef-ob">}[htbp]
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</span><span style="color: #3b6ea8;">\centering</span>
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<span style="color: DimGray;">\includegraphics</span><span class="ef-ob">[width=.9</span><span style="color: DimGray;">\linewidth</span><span class="ef-ob">]{figures/salvador-dali-persistence-of-memory.jpg}
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</span><span style="color: #3b6ea8;">\caption</span><span class="ef-ob">{</span><span style="color: #9a7500;">A famous surrealist painting</span><span class="ef-ob">}
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</span><span style="color: #3b6ea8;">\end</span><span class="ef-ob">{</span><span style="color: #29838d;">figure</span><span class="ef-ob">}
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</span><span style="color: #b1b1b1;">#+end_src
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</span>
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As you may have guessed from the fact this works without a LaTeX-specific
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keyword, this works nicely in HTML too 🙂.
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<span style="color: #b6b6b6;">#+caption:</span> <span class="ef-ob">A famous surrealist painting</span>
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<span style="color: #3b6ea8; font-weight: 700;">[[file:figures/salvador-dali-persistence-of-memory.jpg]]</span>
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The LaTeX backend also accepts additional image attributes (<span style="color: #3b6ea8; font-weight: 700;">[[https://orgmode.org/manual/Images-in-LaTeX-export.html][manual page]]</span>). For
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example, to set the image width I can simply add
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<span style="color: #b1b1b1;">#+begin_src org
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</span><span class="ef-ob">,#+attr_latex: :width 0.4\linewidth
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</span><span style="color: #b1b1b1;">#+end_src
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</span>above the image link.
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You can do the same with tables:
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<span style="color: #b1b1b1;">#+begin_src org
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</span><span class="ef-ob">,#+caption: A selection of famous paintings by Salvador Dalí
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</span><span style="color: #842879;">| Year | Painting |</span>
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<span style="color: #842879;">|------+----------------------------|</span>
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<span style="color: #842879;">| 1931 | The persistence of memory |</span>
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<span style="color: #842879;">| 1937 | Swans reflecting elephants |</span>
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<span style="color: #842879;">| 1837 | Metamorphosis of narcissus |</span>
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<span style="color: #842879;">| 1952 | Galatea of the spheres |</span>
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<span style="color: #842879;">| 1966 | Tuna fishing |</span>
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<span style="color: #b1b1b1;">#+end_src
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</span>
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I like to set <span style="color: #9e9e9e;">src_</span><span style="color: #b6b6b6;">elisp</span><span style="color: #9e9e9e;">{</span><span class="ef-ob">(</span><span style="color: #3b6ea8;">setq</span><span class="ef-ob"> org-latex-tables-booktabs t)</span><span style="color: #9e9e9e;">}</span> to use the nice
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<span style="color: #4f894c;">=booktabs=</span> rules in the generated tables. Just remember to ensure the <span style="color: #4f894c;">=booktabs=</span>
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package is loaded.
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<span style="color: #b1b1b1;">#+begin_src LaTeX
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</span><span style="color: #3b6ea8;">\begin</span><span class="ef-ob">{</span><span style="color: #29838d;">table</span><span class="ef-ob">}[htbp]
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</span><span style="color: #3b6ea8;">\caption</span><span class="ef-ob">{</span><span style="color: #9a7500;">A selection of famous paintings by Salvador Dalí</span><span class="ef-ob">}
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</span><span style="color: #3b6ea8;">\centering</span>
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<span style="color: #3b6ea8;">\begin</span><span class="ef-ob">{</span><span style="color: #29838d;">tabular</span><span class="ef-ob">}{rl}
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</span><span style="color: DimGray;">\toprule</span><span class="ef-ob">
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Year </span><span style="color: #9a7500;">&</span><span class="ef-ob"> Painting</span><span style="color: #9a7500;">\\</span>
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<span style="color: DimGray;">\midrule</span><span class="ef-ob">
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1931 </span><span style="color: #9a7500;">&</span><span class="ef-ob"> The persistence of memory</span><span style="color: #9a7500;">\\</span><span class="ef-ob">
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1937 </span><span style="color: #9a7500;">&</span><span class="ef-ob"> Swans reflecting elephants</span><span style="color: #9a7500;">\\</span><span class="ef-ob">
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1837 </span><span style="color: #9a7500;">&</span><span class="ef-ob"> Metamorphosis of narcissus</span><span style="color: #9a7500;">\\</span><span class="ef-ob">
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1952 </span><span style="color: #9a7500;">&</span><span class="ef-ob"> Galatea of the spheres</span><span style="color: #9a7500;">\\</span><span class="ef-ob">
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1966 </span><span style="color: #9a7500;">&</span><span class="ef-ob"> Tuna fishing</span><span style="color: #9a7500;">\\</span>
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<span style="color: DimGray;">\bottomrule</span>
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<span style="color: #3b6ea8;">\end</span><span class="ef-ob">{</span><span style="color: #29838d;">tabular</span><span class="ef-ob">}
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</span><span style="color: #3b6ea8;">\end</span><span class="ef-ob">{</span><span style="color: #29838d;">table</span><span class="ef-ob">}
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</span><span style="color: #b1b1b1;">#+end_src
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</span>
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Org is nice and does the right thing^{TM} by including the caption at the top.
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<span style="color: #b6b6b6;">#+caption:</span> <span class="ef-ob">Look ma, I put the caption in the right place.</span>
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<span style="color: #b6b6b6;">#+attr_html: :class invertible</span>
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<span style="color: #3b6ea8; font-weight: 700;">[[file:figures/org-table-to-latex-example.png]]</span>
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There are also some <span style="color: #3b6ea8; font-weight: 700;">[[https://orgmode.org/manual/Images-in-LaTeX-export.html][more attributes]]</span> you can supply to tables. Should I want the
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table to spread out I could use <span style="color: #4f894c;">=#+attr_latex: :environment tabularx=</span> (as long as
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I've loaded the <span style="color: #4f894c;">=tabularx=</span> package) and then set the columns with <span style="color: #4f894c;">=:align lX=</span>.
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<span style="color: #97365b; font-weight: 700;">** Code blocks</span>
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By default, source code blocks are translated verbatim. We can do better than
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that however. We can tell Org to use <span style="color: #3b6ea8; font-weight: 700;">[[https://ctan.org/pkg/listings][listings]]</span>, but I'd recommend going one step
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further and using <span style="color: #3b6ea8; font-weight: 700;">[[https://ctan.org/pkg/minted][minted]]</span>. For this to work we need to perform three actions:
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+ Tell Org we want to use <span style="color: #4f894c;">=minted=</span> environments for source code
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+ Load the <span style="color: #4f894c;">=minted=</span> package by default
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+ Add <span style="color: #4f894c;">=-shell-escape=</span> to our LaTeX compiler flags, so <span style="color: #4f894c;">=minted=</span> may call <span style="color: #3b6ea8; font-weight: 700;">[[https://pygments.org/][pygments]]</span>.
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This can easily be accomplished via the following snippet:
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<span style="color: #b1b1b1;">#+begin_src emacs-lisp
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</span><span class="ef-ob">(</span><span style="color: #3b6ea8;">setq</span><span class="ef-ob"> org-latex-listings 'minted
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</span><span style="color: #b1b1b1;">;; </span><span style="color: #b1b1b1;">as long as you have latexmk installed
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</span><span class="ef-ob"> org-latex-pdf-process
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'(</span><span style="color: #4f894c;">"latexmk -f -pdf -%latex -shell-escape -interaction=nonstopmode -output-directory=%o %f"</span><span class="ef-ob">))
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(add-to-list 'org-latex-packages-alist '(</span><span style="color: #4f894c;">""</span> <span style="color: #4f894c;">"minted"</span><span class="ef-ob">))
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</span><span style="color: #b1b1b1;">#+end_src
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</span>
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To customise <span style="color: #4f894c;">=minted=</span>, as well as inserting content into the <span style="color: #3b6ea8; font-weight: 700;">[[Preamble content][preamble]]</span>, one can
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also customise <span style="color: #ac4426;">~org-latex-minted-options~</span> to control what options are applied to
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each <span style="color: #4f894c;">=minted=</span> environment.
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<span style="color: #97365b; font-weight: 700;">** Custom environments</span>
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Org has a number of <span style="color: #3b6ea8; font-weight: 700;">[[https://orgmode.org/manual/Blocks.html][blocks]]</span> which are treated specially, like <span style="color: #4f894c;">=#+begin_src=</span> for
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source code, and <span style="color: #4f894c;">=#+begin_centre=</span> for centred text. When exporting this same
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syntax allows you to wrap Org content in any LaTeX environments (as long as it
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doesn't match one of Org's recognised environments).
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For example, if you wrote a <span style="color: #4f894c;">=warning=</span> environment in LaTeX to box and emphasise
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text, to wrap some Org content in it one simply needs to write:
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<span style="color: #b1b1b1;">#+begin_src org
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</span><span class="ef-ob">,#+begin_warning
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Pay close attention! This is very important.
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,#+end_warning
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</span><span style="color: #b1b1b1;">#+end_src
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</span>and the content will be wrapped in <span style="color: #4f894c;">=\begin{warning} ... \end{warning}=</span>.
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<span style="color: #97365b; font-weight: 700;">** The LaTeX escape hatches</span>
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Should there be a particular LaTeX command you wish to insert somewhere, you
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simply need to put it on its own line with <span style="color: #4f894c;">=#+latex:=</span> in front and it will be
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transferred to the generated LaTeX (this works with other formats too).
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<span style="color: #b1b1b1;">#+begin_src org
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</span><span class="ef-ob">,#+latex: \newpage
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</span><span style="color: #b1b1b1;">#+end_src
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</span>
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For larger snippets of LaTeX, there's always the export block.
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<span style="color: #b1b1b1;">#+begin_src org
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</span><span class="ef-ob">,#+begin_export latex
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\cleardoublepage
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\vfil
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\hfil This page is intentionally left blank \hfil
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\vfil
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\newpage
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,#+end_export
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</span><span style="color: #b1b1b1;">#+end_src
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</span>
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<span style="color: #97365b; font-weight: 700;">** Preamble content</span>
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||
Should you wish to include the line in the preamble (before <span style="color: #4f894c;">=\begin{document}=</span>),
|
||
then all you need to do is use <span style="color: #4f894c;">=#+latex_header:=</span>.
|
||
<span style="color: #b1b1b1;">#+begin_src org
|
||
</span><span class="ef-ob">,#+latex_header: \newcommand{\RR}{\mathbb{R}}
|
||
,#+latex_header: \usepackage{svg} % so that </span><span style="color: #3b6ea8; font-weight: 700;">[[file:*.svg]]</span><span class="ef-ob"> works nicely
|
||
</span><span style="color: #b1b1b1;">#+end_src
|
||
</span>This is great for adding one-off <span style="color: #4f894c;">=\usepackage=</span> commands, but what if you find
|
||
yourself wanting a package (like <span style="color: #3b6ea8; font-weight: 700;">[[https://ctan.org/pkg/svg][svg]]</span>) to be always included? Well the we have
|
||
the aforementioned <span style="color: #ac4426;">~org-latex-packages-alist~</span> which will include the packages
|
||
set when exporting; you can even set some packages to only be included when
|
||
using a certain LaTeX compiler.
|
||
|
||
Should you want to use a certain preset preamble, you can make use of the
|
||
<span style="color: #4f894c;">=#+latex_class=</span> keyword. This is used to set the base preamble template used when
|
||
generating the LaTeX. See <span style="color: #ac4426;">~org-latex-classes~</span> for what's available by default. You
|
||
should see entries for:
|
||
+ article
|
||
+ report
|
||
+ book
|
||
+ beamer
|
||
|
||
One of these is always used when generating LaTeX; when no <span style="color: #4f894c;">=#+latex_class=</span> is set
|
||
in the document, the template named by <span style="color: #ac4426;">~org-latex-default-class~</span> will be used.
|
||
|
||
What's great about this is that is makes it really easy to add your own
|
||
templates. Each template simply takes three components:
|
||
1. A name
|
||
2. A preamble template
|
||
3. A series of format strings to translate headings to LaTeX, with and without numbering
|
||
|
||
For example, I'm quite a fan of the <span style="color: #3b6ea8; font-weight: 700;">[[https://ctan.org/pkg/koma-script][KOMA-script]]</span> family. Should I want to add a
|
||
<span style="color: #4f894c;">=kart=</span> class (for: <span style="font-weight: 700;">*k*</span>oma <span style="font-weight: 700;">*art*</span>icle), I simply need to do something like the
|
||
following:
|
||
<span style="color: #b1b1b1;">#+begin_src emacs-lisp
|
||
</span><span class="ef-ob">(add-to-list 'org-latex-classes
|
||
'(</span><span style="color: #4f894c;">"kart"</span> <span style="color: #b1b1b1;">; </span><span style="color: #b1b1b1;">class name
|
||
</span> <span style="color: #4f894c;">"\\documentclass{scrartcl}"</span> <span style="color: #b1b1b1;">; </span><span style="color: #b1b1b1;">preamble template
|
||
</span><span class="ef-ob"> (</span><span style="color: #4f894c;">"\\section{%s}"</span><span class="ef-ob"> . </span><span style="color: #4f894c;">"\\section*{%s}"</span><span class="ef-ob">) </span><span style="color: #b1b1b1;">; </span><span style="color: #b1b1b1;">H1 translation
|
||
</span><span class="ef-ob"> (</span><span style="color: #4f894c;">"\\subsection{%s}"</span><span class="ef-ob"> . </span><span style="color: #4f894c;">"\\subsection*{%s}"</span><span class="ef-ob">) </span><span style="color: #b1b1b1;">; </span><span style="color: #b1b1b1;">H2 translation
|
||
</span><span class="ef-ob"> (</span><span style="color: #4f894c;">"\\subsubsection{%s}"</span><span class="ef-ob"> . </span><span style="color: #4f894c;">"\\subsubsection*{%s}"</span><span class="ef-ob">) </span><span style="color: #b1b1b1;">; </span><span style="color: #b1b1b1;">H3...
|
||
</span><span class="ef-ob"> (</span><span style="color: #4f894c;">"\\paragraph{%s}"</span><span class="ef-ob"> . </span><span style="color: #4f894c;">"\\paragraph*{%s}"</span><span class="ef-ob">)
|
||
(</span><span style="color: #4f894c;">"\\subparagraph{%s}"</span><span class="ef-ob"> . </span><span style="color: #4f894c;">"\\subparagraph*{%s}"</span><span class="ef-ob">)))
|
||
</span><span style="color: #b1b1b1;">#+end_src
|
||
</span>
|
||
See the documentation for <span style="color: #ac4426;">~org-latex-classes~</span> for more information on how the
|
||
preamble template in handled.
|
||
|
||
<span style="color: #3b6ea8; font-weight: 700;">* Other improvements</span>
|
||
+ <span style="color: #4f894c;">=ox-koma-letter.el=</span> has been brought into Org's main directory from the ) <span style="color: #4f894c;">=contrib/=</span> repo _Bastien Guerry_
|
||
+ Speed up publishing by using delayed hooks and temp buffers instead of finding
|
||
files _Gustav Wikström_
|
||
+ Improve generated HTML quality: prevent W3C warning and add some accessibility
|
||
labels _TEC_
|
||
+ Make the behaviour of the "goto variant" of <span style="color: #ac4426;">~org-refile~</span> (<span style="color: #ac4426;">~org-speed-commands~</span>)
|
||
less confusing _Marco Wahl_
|
||
+ Backport an update to the OpenDocument schema _Kyle Meyer_
|
||
|
||
<span style="color: #3b6ea8; font-weight: 700;">* Bugfixes</span>
|
||
+ Off by one error in texinfo menu generation _Nicolas Goaziou_
|
||
+ Error in entry/conversion of non-24h times in the agenda _Nicolas Goaziou_
|
||
+ Only use <span style="color: #ac4426;">~replace-buffer-contents~</span> with Emacs 27+ when saving src blocks, as the
|
||
behaviour isn't consistent until then _Nicolas Goaziou_
|
||
+ Prevent "before first headline" error in <span style="color: #4f894c;">=org-clock=</span> when clocking out _Nicolas Goaziou_
|
||
+ Avoid setting the global agenda name when following a timestamp link _Ingo Lohmar_
|
||
+ Don't bind <span style="color: #4f894c;">=<tab>=</span> in <span style="color: #ac4426;">~org-mode-map~</span> _Nicolas Goaziou_
|
||
+ Erroneous tangling of source block with <span style="color: #4f894c;">=:tangle no=</span> to a file <span style="color: #4f894c;">=no=</span> when the
|
||
tangle command is called with a single universal argument _Jacopo De Simoi_
|
||
|
||
<span style="color: #3b6ea8; font-weight: 700;">* Footnotes</span>
|
||
|
||
<span style="color: #ac4426;">[fn:1]</span> As has been the writing of this blog post 😜
|
||
|
||
<span style="color: #ac4426;">[fn:2]</span> First-class support for citations is coming to Org! With support for <span style="color: #3b6ea8; font-weight: 700;">[[https://citationstyles.org/][CSL]]</span>
|
||
and <span style="color: #3b6ea8; font-weight: 700;">[[https://en.wikipedia.org/wiki/BibTeX][BibTeX]]</span>, with a number of citation processors 🙌. Soon^{TM}
|
||
|
||
<span style="color: #ac4426;">[fn:3]</span> I'm rather a fan of the <span style="color: #4f894c;">=capitalize=</span> option because (1) technically the
|
||
reference to a named object is a proper noun, and (2) this means you don't have
|
||
to worry about references not being capitalized when appearing at the start of a
|
||
sentence.
|
||
|
||
</pre>
|
||
<body>
|
||
</html> |