From 1d56e6059e65f3c207296e3feb5aa9ae8bcd4e9d Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Sun, 21 Nov 2021 10:07:05 -0800
Subject: Add custom-writers.md.

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+---
+author:
+- John MacFarlane
+date: 'November 21, 2021'
+title: Creating Custom Pandoc Writers in Lua
+---
+
+# Introduction
+
+If you need to render a format not already handled by pandoc,
+or you want to change how pandoc renders a format,
+you can create a custom writer using the [Lua] language.
+Pandoc has a built-in Lua interpreter, so you needn't
+install any additional software to do this.
+
+[Lua]: https://www.lua.org
+
+A custom writer is a Lua file that defines functions for
+rendering each element of a pandoc AST.
+
+For example,
+
+``` lua
+function Para(s)
+  return "<paragraph>" .. s .. "</paragraph>"
+end
+```
+
+The best way to go about creating a custom writer is to modify
+the example that comes with pandoc.  To get the example, you
+can do
+
+```
+pandoc --print-default-data-file sample.lua > sample.lua
+```
+
+`sample.lua` is a full-features HTML writer, with explanatory
+comments. To use it, just use the path to the custom writer as
+the writer name:
+
+```
+pandoc -t sample.lua myfile.md
+```
+
+`sample.lua` defines all the functions needed by any custom
+writer, so you can design your own custom writer by modifying
+the functions in `sample.lua` according to your needs.
+
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