Thanks Simon. In general I think multiline tuples should have many elements per line, but honestly the tuple case was a very specific example. If possible, I'd like to change the *overall* wrapping for *all* error messages - how does `sep` know when to break lines? there's clearly a numeric value for the number of columns somewhere, but where is it, and is it user-adjustable?
For now I am just hacking around this by special-casing some error messages and "un-doing" the line wrapping by parsing the messages and joining lines back together. Thanks, Andrew On Mon, Jan 6, 2014 at 7:44 AM, Simon Peyton-Jones <[email protected]>wrote: > I think it’s line 705 in types/TypeRep.lhs > > > > pprTcApp p pp tc tys > > | isTupleTyCon tc && tyConArity tc == length tys > > = pprPromotionQuote tc <> > > tupleParens (tupleTyConSort tc) (sep (punctuate comma (map (pp > TopPrec) tys))) > > > > If you change ‘sep’ to ‘fsep’, you’ll get behaviour more akin to > paragraph-filling (hence the “f”). Give it a try. You’ll get validation > failure from the testsuite, but you can see whether you think the result is > better or worse. In general, should multi-line tuples be printed with many > elements per line, or just one? > > > > Simon > > > > *From:* ghc-devs [mailto:[email protected]] *On Behalf Of *Andrew > Gibiansky > *Sent:* 04 January 2014 17:30 > *To:* Erik de Castro Lopo > *Cc:* [email protected] > *Subject:* Re: Changing GHC Error Message Wrapping > > > > Apologize for the broken image formatting. > > > > With the code I posted above, I get the following output: > > > > Couldn't match expected type `(GHC.Types.Int, > > GHC.Types.Int, > > GHC.Types.Int, > > t0, > > t10, > > t20, > > t30, > > t40, > > t50, > > t60, > > t70, > > t80, > > t90)' > > with actual type `(t1, t2, t3)' > > > > I would like the types to be on the same line, or at least wrapped to a > larger number of columns. > > > > Does anyone know how to do this, or where in the GHC source this wrapping > is done? > > > > Thanks! > > Andrew > > > > On Sat, Jan 4, 2014 at 2:55 AM, Erik de Castro Lopo <[email protected]> > wrote: > > Carter Schonwald wrote: > > > hey andrew, your image link isn't working (i'm using gmail) > > I think the list software filters out image attachments. > > Erik > -- > ---------------------------------------------------------------------- > Erik de Castro Lopo > http://www.mega-nerd.com/ > > _______________________________________________ > ghc-devs mailing list > [email protected] > http://www.haskell.org/mailman/listinfo/ghc-devs > > >
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