A Rust module for writing pandoc filters, in the spirit of the Python module and the Haskell module.
A filter is a function T -> T, where T is one of the types that implement
the Walkable trait in types.rs. Typically T will be either Block or
Inline.
After writing the function, simply pass it to filter, defined in json.rs. It
takes a Pandoc AST and returns the transformed AST. main.rs shows an example
of this usage with makes every inline string uppercase.
Most people would probably do better by just using the Python module, but I wanted to have an interface to manipulate the Pandoc AST in the context of a larger program (specifically safe_blog). A type-safe tool for writing filters provides just that.
types.rs has a lot of custom serializer code that can probably be
simplified. I wrote this code because Serde's automatically generated serializer
isn't fully compatible with Pandoc: for example, it serializes X("a","b") as
["a", "b"], whereas Pandoc wants something of the form [{"a": []}, {"b": []}].