In the static site generator I'm working on, you can include shell commands in your documents, the output of which is run through the parser. The payoff for this has already been incredible.
My site generator now has a simple templating tool because I finally found myself in the position where i was considering needing more than one template.
It's so satisfying to feel comfortable writing parsers and formatters like this, it's like a whole world has opened up to me now that I can write little DSLs in an evening.
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