On Thu, May 14, 2009 at 03:58:18PM -0300, José Romildo Malaquias wrote:
Then the resulting of pretty printing the given tree would be something like the following:
a | +-------------+ | | | b c d | | +---+ +---+ | | | | c1 c2 d1 d2 | d1a
There is the module Text.PrettyPrint.HughesPJ, but it lacks examples on how to use the pretty print combinators, and it is not well docomented.
Text.PrettyPrint.HughesPJ is actually not a good tool for this, since it is for pretty-printing line-oriented material (i.e. source code). I actually have a library I was developing a while ago to do the sort of pretty-printing/layout of text that you're looking for, using a box model similar to that of TeX, but I never released it. Hopefully I'll get around to polishing and releasing it this summer. -Brent