[Haskell-cafe] Prettier pretty-printing of data types?
tab at snarc.org
Wed Mar 14 00:08:44 CET 2012
On 03/13/2012 10:33 PM, Johan Tibell wrote:
> value = Bin 1 (Bin 2 Leaf Leaf) (Bin 3 Leaf Leaf)
I'm usually using the following snippet which is a tweak of the gshow function
However everything need to be a member of Data/Typeable, and also list are not
particularly well handled with this.
gshowHier :: Data a => Int -> a -> String
gshowHier il a = intercalate "\n" (constr : gmapQ (gshowHier (il+2)) a)
where constr = replicate il ' ' ++ (showConstr $ toConstr a)
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