#5461: Reconfigurable pretty-printing in GHCi
---------------------------------+------------------------------------------
Reporter: simonpj | Owner:
Type: bug | 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
---------------------------------+------------------------------------------
Phil Wadler wants to control the pretty-printer used to display output in
GHCi. Something: adding a flag
{{{
-pretty <function-name>
}}}
The supplied function will typically have type `(C a => a -> String)` for
some class C. Using Razvan's libary, he could declare
{{{
:set -pretty GenericPretty.pretty
}}}
for example.
Since this is GHCi-specific, one could use a new GHCi command instead:
{{{
:pretty GenericPretty.pretty
}}}
The latter design would presumably look up `GenericPretty.pretty` in the
current context, and bleat if not found. The version with a flag might do
that each time the pretty printer was used, which is arguably less
efficient and (more important) more confusing. Personally I think I
prefer the `:pretty` command best. (I'm not fussy about the name.)
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5461>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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