For template engine converters, set template_engine frontmatter automatically #177
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…and check before conversions. This fixes #176
Basically we only want one template engine at a time per file. No Liquid + ERB, no ERB + Slim, whatever. Doesn't make sense. So this code guarantees mutual exclusivity. It's a little verbose and not great on the DRY metric, so I'll look into adding additional smarts to the
Converter
parent class so the individual converters can get cleaned up a bit. But for now, this should work.