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The implicitly defined global filter (i.e. all element filtering
functions defined in the global lua environment) is used if no filter is
returned from a lua script. This allows to just write top-level
functions in order to define a lua filter. E.g
function Emph(elem) return pandoc.Strong(elem.content) end
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The return-type parameter for lua filter functions is removed. It only
complicated the code without introducing any additional type safety.
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We want to provide an interface familiar to users of other filtering
libraries.
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Allow to use functions named `SingleQuoted`, `DoubleQuoted`,
`DisplayMath`, and `InlineMath` in filters.
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Filtering functions take element components as arguments instead of the
whole block elements. This resembles the way elements are handled in
custom writers.
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Pushing values to the lua stack via custom functions is faster and more
flexible.
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Instead of taking the whole inline element, forcing users to destructure it
themselves, the components of the elements are passed to the filtering
functions.
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Inline elements are no longer pushed and pulled via aeson's Value.
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This is slightly cleaner while keeping performance approximately the
same.
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Plain text readers are exposed to lua scripts via the `pandoc.reader`
submodule, which is further subdivided by format. Converting e.g. a
markdown string into a pandoc document is possible from within lua:
doc = pandoc.reader.markdown.read_doc("Hello, World!")
A `read_block` convenience function is provided for all formats,
although it will still parse the whole string but return only the first
block as the result.
Custom reader options are not supported yet, default options are used
for all parsing operations.
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* Add `--lua-filter` option. This works like `--filter` but takes pathnames of special lua filters and uses the lua interpreter baked into pandoc, so that no external interpreter is needed. Note that lua filters are all applied after regular filters, regardless of their position on the command line.
* Add Text.Pandoc.Lua, exporting `runLuaFilter`. Add `pandoc.lua` to data files.
* Add private module Text.Pandoc.Lua.PandocModule to supply the default lua module.
* Add Tests.Lua to tests.
* Add data/pandoc.lua, the lua module pandoc imports when processing its lua filters.
* Document in MANUAL.txt.
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