Add interpolation to the quasiquoter?

[thomasjm]

It would be really handy if you could interpolate values in the yamlQQ quasiquoter using #{...} notation, just like how aeson-qq provides this for JSON.

[snoyberg]

PR welcome, but I don't have any plans on adding that myself for now.

[sjshuck]

Just thinking out loud. I guess the two biggest issues would be

1. Parsing embedded Haskell in aeson-qq works via the haskell-src-meta package, which pulls in significant dependencies such as haskell-src-exts. Installing haskell-src-meta takes 3 extra minutes on my machine after installing yaml.
2. aeson-qq has the nice property that # or $ are always invalid JSON in that context, and therefore function unambiguously. In YAML, there's isn't a reliable choice of characters that would violate the syntax: in particular, the # in an unquoted scalar introduces a comment, and the $ can just occur normally in a mapping key.

It seems like an external library would be better suited to implement this functionality.