Hi,
When pretty printing this haskell code:
case x of
-1 -> x
The pretty printer in PPSemiColon mode produces something like:
case x of
{- 1
thus making a false comment, due to the brace crashing into the
negative sign.
I think this is a design issue, but probably the offending code is:
topLevel :: Doc -> [Doc] -> Doc
topLevel header dl = do
e <- fmap layout getPPEnv
case e of
PPOffsideRule -> header $$ vcat dl
PPSemiColon -> header $$ (braces . vcat . punctuate semi) dl
PPInLine -> header $$ (braces . vcat . punctuate semi) dl
PPNoLayout -> header <+> (braces . hsep . punctuate semi) dl
Also, while I'm on the topic of the pretty printer I wonder whether
it would be possible (and considered a good idea) to add an argument
to PPHsMode that allows for wider lines of code, I think currently it is
starting to get flustered around 100 columns or so. Perhaps there is already
a good way of doing this and I'm just missing it?
The reason I ask is that I am pretty printing some code which is the output
of a program transformation. Quite often the code creeps off to the far rhs,
at this point the pretty printer starts aggressively breaking lines which
is less than pretty.
Cheers,
Bernie.
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