- Allow prepending a separate YAML file for e.g. including common
template definitions. This is accomodated by a new commandline option,
--prepend-file, which takes a path to a YAML file. This is prepended
to the regular input as-is.
- Refactor file loading to accomodate the above. This includes moving
relevant parts to main() and instead supplying parse () with a string
representation of the YAML data. Also add early file existance checks
and bail out if any of the inputs are inaccessible or nonexistant.
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