#5461: Reconfigurable pretty-printing in GHCi
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Reporter: simonpj | Owner:
Type: feature request | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.2.1
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Comment(by simonmar):
I think I would implement this as a flag, mainly because it's simpler: no
changes to the GHC API, or the `InteractiveContext` type, just `DynFlags`
and `TcRnDriver.mkPlan`.
You could still have a `:pretty` command in GHCi, and also check for
errors early by implementing that in the GHCi front end.
Also, the function should be a replacement for `print`, i.e. it should
have a type of the form `C a => a -> IO String`. See `TcRnDriver.mkPlan`
for details of how we typecheck interactive statements.
I would probably call it `-interactive-print=<name>`.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5461#comment:3>
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