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Provides not-in-format filter (#153)
The code comments are in LDoc format.
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‎not-in-format/LICENSE‎

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MIT License
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Copyright (c) 2021 Julien Dutant
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎not-in-format/Makefile‎

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DIFF ?= diff --strip-trailing-cr -u
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.PHONY: test
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test: test_html test_latex
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test_html: sample.md expected.html not-in-format.lua
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@pandoc --lua-filter not-in-format.lua --to=html $< \
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| $(DIFF) expected.html -
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test_latex: sample.md expected.tex not-in-format.lua
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@pandoc --lua-filter not-in-format.lua --to=latex $< \
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| $(DIFF) expected.tex -
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expected.html: sample.md not-in-format.lua
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pandoc --lua-filter not-in-format.lua --output $@ $<
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expected.tex: sample.md not-in-format.lua
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pandoc --lua-filter not-in-format.lua --output $@ $<

‎not-in-format/README.md‎

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---
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title: "Not-in-format - Keep document parts out of selected output
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formats"
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author: "Julien Dutant"
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---
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Not-in-format
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=======
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Keeps parts of a document out of selected output formats.
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v1.0. Copyright: © 2021 Julien Dutant <[email protected]>
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License: MIT - see LICENSE file for details.
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Usage
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-----
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This Lua filter for Pandoc that keeps parts of a document out of selected outputs formats.
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*Use case*. Sometimes a bit of markdown will convert well through Pandoc
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to some formats not others. Say, you have a table that is reasonably
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well converted to html and docx, but you want more control on the
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LaTeX output. This filter allows you to:
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* Enter the desired LaTeX table output as a [fenced block with a raw
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attribute](https://pandoc.org/MANUAL.html#extension-raw_attribute).
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* Mark up the markdown table so that it is output only in formats other
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than LaTeX.
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*Usage*. Mark up the part you want to keep out of some output format(s)
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as a native Div with the attributes `not-in-format` and the names of the
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format(s) in question:
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```markdown
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::: {.not-in-format .latex .beamer}
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---------------------------
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This table is not kept
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----------- ----------------
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in formats latex, beamer
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----------------------------
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:::
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```
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Use format names for [Pandoc's list of output formats](https://pandoc.org/MANUAL.html#option--to), which you can print out by running ```pandoc --list-output-formats```.
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You would normally provide a raw equivalent for the part in question in
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the format(s) in question, using Pandoc's [fenced blocks with a raw
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attribute](https://pandoc.org/MANUAL.html#extension-raw_attribute):
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```markdown
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::: {.not-in-format .latex .beamer}
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---------------------------
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This table is not kept
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----------- ----------------
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in formats latex, beamer
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----------------------------
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:::
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~~~{=latex}
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begin{tabular}{|c|c|}
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\toprule
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This table & is not kept \\ \addlinespace
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\midrule
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\endhead
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in formats & latex, beamer \\ \addlinespace
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\bottomrule
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\end{tabluar}
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~~~
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```
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A fenced block with a raw attribute can only have one attribute, so you
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need one for each format for which the markdown is left out. But Pandoc
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will output the raw block in equivalent formats: a `latex` block will
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be output in `latex` and `beamer`, a `html5` block in `html` and `epub3`
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and so on. See [Pandoc's manual](https://pandoc.org/MANUAL.html#extension-raw_attribute).
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Installation
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------------
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Copy `not-in-format.lua` in your document folder or in your pandoc data
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dir path.
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Contributing
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------------
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PRs welcome.

‎not-in-format/expected.html‎

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<p>The table below exists in two versions. The LaTeX version will be used in <code>latex</code> and <code>beamer</code> and the markdown version in all other output formats.</p>
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<div class="not-in-format latex beamer">
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<table style="width:40%;">
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<colgroup>
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<col style="width: 16%" />
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<col style="width: 23%" />
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</colgroup>
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<thead>
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<tr class="header">
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<th style="text-align: left;">This table</th>
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<th style="text-align: center;">is not kept</th>
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</tr>
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</thead>
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<tbody>
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<tr class="odd">
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<td style="text-align: left;">in formats</td>
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<td style="text-align: center;">latex, beamer</td>
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</tr>
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</tbody>
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</table>
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</div>

‎not-in-format/expected.tex‎

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The table below exists in two versions. The LaTeX version will be used
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in \texttt{latex} and \texttt{beamer} and the markdown version in all
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other output formats.
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begin{tabular}{|c|c|}
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\toprule
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This table & is used \\ \addlinespace
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\midrule
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\endhead
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in formats & latex, beamer \\ \addlinespace
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\bottomrule
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\end{tabluar}

‎not-in-format/not-in-format.lua‎

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--- # not-in-format - keep document parts out of selected output formats.
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--
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-- This Lua filter for Pandoc that keeps parts of a document out of
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-- selected outputs formats.
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--
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-- @author Julien Dutant <[email protected]>, Albert Krewinkel
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-- @copyright 2021 Julien Dutant, Albert Krewinkel
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-- @license MIT - see LICENSE file for details.
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-- @release 1.0
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--- Main Div filter.
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-- Removes Divs tagged with `not-in-format` if the
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-- output format matches one of the Div's attributes
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-- @param element a Div element
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-- @return an empty block if the Div classes include `not-in-format`
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-- and the target format
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function Div(element)
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-- the find_if method returns the first value x in the list
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-- element.classes for which FORMAT:match(x) evaluates as true,
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-- and nil otherwise. Within the if clause that value evaluates
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-- as true and nil evaluates as false.
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if element.classes:includes('not-in-format') and
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element.classes:find_if(function (x) return FORMAT:match(x) end) then
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return {}
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end
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-- else the function returns `nil` and Pandoc leaves the element as is
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end

‎not-in-format/sample.md‎

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The table below exists in two versions. The LaTeX version will be used in `latex` and `beamer` and the markdown version in all other output formats.
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::: {.not-in-format .latex .beamer}
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---------------------------
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This table is not kept
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----------- ----------------
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in formats latex, beamer
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----------------------------
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:::
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~~~{=latex}
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begin{tabular}{|c|c|}
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\toprule
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This table & is used \\ \addlinespace
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\midrule
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\endhead
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in formats & latex, beamer \\ \addlinespace
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\bottomrule
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\end{tabluar}
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~~~

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