[Haskell-cafe] Program used for debugging

[Andrew Butterfield]

On 1 Dec 2011, at 14:10, Yves Parès wrote:

> Hey,
> 
> What do you mostly use for debugging?
> Simple calls to Debug.Trace.trace? Hpc? Hood?

Debug.Trace, with some short helpers

so  
 dbg "x=" x  
displays the value of x, provided x is in Show

import Debug.Trace

dbg msg x = dbgsh show msg x
dbgsh sh msg x = trace (msg++sh x) x
cdbg p msg x
 | p x        =  dbg msg x
 | otherwise  =  x

-- if you want to tailor the "show":
class Dshow t where dshow :: t -> String
ddbg msg x = dbgsh dshow msg x
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Andrew Butterfield     Tel: +353-1-896-2517     Fax: +353-1-677-2204
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Director of Teaching and Learning - Undergraduate,
School of Computer Science and Statistics,
Room G.39, O'Reilly Institute, Trinity College, University of Dublin
                          http://www.scss.tcd.ie/Andrew.Butterfield/
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