<div dir="ltr">Simon,<div><br></div><div>That's exactly what I'm looking for! But it seems that doing it dynamically in the GHC API doesn't work (as in my first email where I tried to adjust pprCols via setSessionDynFlags).</div>
<div><br></div><div>I'm going to look into the source as what ppr-cols=N actually sets and probably file a bug - because this seems like buggy behaviour...</div><div><br></div><div>Andrew</div></div><div class="gmail_extra">
<br><br><div class="gmail_quote">On Tue, Jan 7, 2014 at 4:14 AM, Simon Peyton Jones <span dir="ltr"><<a href="mailto:simonpj@microsoft.com" target="_blank">simonpj@microsoft.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#1f497d">-dppr-cols=N changes the width of the output page; you could try a large number there. There isn’t a setting meaning “infinity”, sadly.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#1f497d">Simon<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif""> Andrew Gibiansky [mailto:<a href="mailto:andrew.gibiansky@gmail.com" target="_blank">andrew.gibiansky@gmail.com</a>]
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<b>Sent:</b> 07 January 2014 03:04<br>
<b>To:</b> Simon Peyton Jones<br>
<b>Cc:</b> Erik de Castro Lopo; <a href="mailto:ghc-devs@haskell.org" target="_blank">ghc-devs@haskell.org</a></span></p><div><div class="h5"><br>
<b>Subject:</b> Re: Changing GHC Error Message Wrapping<u></u><u></u></div></div><p></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Thanks Simon.<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">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?<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">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.<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Thanks,<u></u><u></u></p>
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<p class="MsoNormal">Andrew<u></u><u></u></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><u></u> <u></u></p>
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<p class="MsoNormal">On Mon, Jan 6, 2014 at 7:44 AM, Simon Peyton-Jones <<a href="mailto:simonpj@microsoft.com" target="_blank">simonpj@microsoft.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#1f497d">I think it’s line 705 in types/TypeRep.lhs</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
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<span style="font-family:"Calibri","sans-serif";color:#1f497d">pprTcApp p pp tc tys</span><u></u><u></u></p>
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<span style="font-family:"Calibri","sans-serif";color:#1f497d"> | isTupleTyCon tc && tyConArity tc == length tys</span><u></u><u></u></p>
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<span style="font-family:"Calibri","sans-serif";color:#1f497d"> = pprPromotionQuote tc <></span><u></u><u></u></p>
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<span style="font-family:"Calibri","sans-serif";color:#1f497d"> tupleParens (tupleTyConSort tc) (sep (punctuate comma (map (pp TopPrec) tys)))</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#1f497d">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?</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#1f497d">Simon</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">
ghc-devs [mailto:<a href="mailto:ghc-devs-bounces@haskell.org" target="_blank">ghc-devs-bounces@haskell.org</a>]
<b>On Behalf Of </b>Andrew Gibiansky<br>
<b>Sent:</b> 04 January 2014 17:30<br>
<b>To:</b> Erik de Castro Lopo<br>
<b>Cc:</b> <a href="mailto:ghc-devs@haskell.org" target="_blank">ghc-devs@haskell.org</a><br>
<b>Subject:</b> Re: Changing GHC Error Message Wrapping</span><u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">Apologize for the broken image formatting.<u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">With the code I posted above, I get the following output:<u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">Couldn't match expected type `(<a href="http://GHC.Types.Int" target="_blank">GHC.Types.Int</a>,</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> <a href="http://GHC.Types.Int" target="_blank">GHC.Types.Int</a>,</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> <a href="http://GHC.Types.Int" target="_blank">GHC.Types.Int</a>,</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> t0,</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> t10,</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> t20,</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> t30,</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> t40,</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> t50,</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> t60,</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> t70,</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> t80,</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> t90)'</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> with actual type `(t1, t2, t3)'</span><u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">I would like the types to be on the same line, or at least wrapped to a larger number of columns.</span><u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Does anyone know how to do this, or where in the GHC source this wrapping is done?</span><u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Thanks!</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Andrew</span><u></u><u></u></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"> <u></u><u></u></p>
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<p class="MsoNormal">On Sat, Jan 4, 2014 at 2:55 AM, Erik de Castro Lopo <<a href="mailto:mle+hs@mega-nerd.com" target="_blank">mle+hs@mega-nerd.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Carter Schonwald wrote:<br>
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> hey andrew, your image link isn't working (i'm using gmail)<u></u><u></u></p>
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<p class="MsoNormal">I think the list software filters out image attachments.<br>
<span style="color:#888888"><br>
Erik<br>
--<br>
----------------------------------------------------------------------<br>
Erik de Castro Lopo<br>
<a href="http://www.mega-nerd.com/" target="_blank">http://www.mega-nerd.com/</a></span><u></u><u></u></p>
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<p class="MsoNormal">_______________________________________________<br>
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<p class="MsoNormal"><u></u> <u></u></p>
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