[Haskell-cafe] "desactivate" my Show instance implementations temporarily
eric.kow at gmail.com
Wed Apr 25 16:13:30 CEST 2012
On 23 Apr 2012, at 17:49, Evan Laforge wrote:
> I use a custom Pretty class along with HughesPJ, ala ghc's Outputable.
> It means I can omit data or print it out in a more readable form
> (even just rounding floats to %.03f can help a lot), and also get nice
> layout and wrapping.
I think I do something similar, although not hooking it up with a proper pretty printing library (that manages indentation etc), but which just stupid builds strings à la Show.
I wish I knew about a Commonly Agreed Idiom (or library) for just recursively creating human-friendly text, but I suspect I only say this because I don't have a clear picture what I'm really wishing for. Does everybody just use HughesPJ?
I'll also mention that it took me a while to untangle all the various notions of showing things in my code. Now it's
* Show: Haskell
* GraphvizShow: dot
* GeniShow: outputting structures in my custom text format
* Pretty: for talking to humans
Embarrassing to say that until recently my code was a random mismash of uses and unclear thinking. For example, it hadn't occurred to me that I shouldn't define GeniShow in terms of other things (but vice versa) because I don't want to accidentally change my file format just because I was trying to make something prettier. Oops.
Eric Kow <http://erickow.com>
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