curly-switch: a filter for variable substitution

[Claudio Di Vita <claudio.divita-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Hi folks,

I just released a Lua filter for referencing metadata values within a
document, thus applying variable substitution.

The code is available on GitHub:
https://github.com/cdivita/pandoc-curly-switch.

Using this filter any document metadata can be referenced as variable
within the document itself. During the conversion, the
variable placeholders are replaced with their effective values.

The following syntax is supported for defining variable placeholders:
- ${...}, the curly brackets syntax
- !...!, the exclamation marks syntax

Variables can be referenced using an object-like notation, using any of the
supported syntax.

Any feedback would be appreciated, I hope that pandoc users will find it
useful....maybe it could be mentioned among Lua filters examples in the
future :D

Cheers,

Claudio

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