Hi, one of my plugins dumps core output to the user, and this core output contains “interesting subexpressions”. I would like to highlight them (for example, with `bold :: SDoc -> SDoc`).
As far as I can see, I have these options:
* I copy all, or most of PprCore, and extend ppr_expr to look for the
subexpressions that I care about.
Obviously not nice, because of a code copy.
* I extend GHC to support that. One way would be to add a new
constructor to `data Tickish id = … | Highlight` so that
I can wrap the interesting subexpressions in
`Tick Highlight e`.
That’s a bit better, and could even be useful in GHC (e.g. a linter
error could highlight the lint error location), but it’d mean
waiting for new compiler versions until I can make use of that,
and it is still limited to subexpressions – highlighting a binder
would require yet another support.
* Could we extend SDoc with an operation
highlightIn :: SDoc -> SDoc -> SDoc
or
highlightIn :: Doc -> Doc -> Doc
where `highlightIn doc1 doc2` is like doc2, but any subdocument that
is “ismorphic to doc1” (for whatever that means) gets highlighted?
Are there other options that I might not see right now?
Cheers,
Joachim
--
Joachim Breitner
m...@joachim-breitner.de
http://www.joachim-breitner.de/
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