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lua-filters.md: add links to filters, and to lua-filters repository.

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Closes #4874.
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John MacFarlane 2018-09-07 16:29:21 -07:00
parent a211edc819
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doc/lua-filters.md
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@ -10,11 +10,11 @@ title: Pandoc Lua Filters
Pandoc has long supported filters, which allow the pandoc
abstract syntax tree (AST) to be manipulated between the parsing
and the writing phase. Traditional pandoc filters accept a JSON
representation of the pandoc AST and produce an altered JSON
representation of the AST. They may be written in any
programming language, and invoked from pandoc using the
`--filter` option.
and the writing phase. [Traditional pandoc
filters](filters.html) accept a JSON representation of the
pandoc AST and produce an altered JSON representation of the
AST. They may be written in any programming language, and
invoked from pandoc using the `--filter` option.
Although traditional filters are very flexible, they have a
couple of disadvantages. First, there is some overhead in
@ -240,6 +240,11 @@ colon syntax (`mystring:uc_upper()`).
# Examples
The following filters are presented as examples.
A repository of useful lua filters (which may also serve
as good examples) is available at
<https://github.com/pandoc/lua-filters>.
## Macro substitution.
The following filter converts the string `{{helloworld}}` into