[Haskell-beginners] pretty-printing data
mpm at alumni.caltech.edu
Sat Aug 29 10:22:06 EDT 2009
For debugging purposes I'm interested in pretty-printing data; to start
with, lists of algebraic data types. Basically I'd like 'show' with the
ability to put each entry of a list on a separate line, and indented. Note
that the algebraic data might have an inner list as one of its elements, so
this is a non-obvious formatting problem.
I believe I can make instances of Show, can I not? Is there something
called showList which I can use to code my own method of showing lists of a
particular type? My understanding is that I can't make [a] an instance of
Show; hence they provided showList.
So basically, I'm wondering if a pretty-printing (for data!) library
already exists, or whether I should try to make instances of Show.
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