Perhaps drawTree on <a href="http://www.haskell.org/ghc/docs/latest/html/libraries/containers/Data-Tree.html">http://www.haskell.org/ghc/docs/latest/html/libraries/containers/Data-Tree.html</a><div><br><div class="gmail_quote">
2009/5/14 José Romildo Malaquias <span dir="ltr">&lt;<a href="mailto:j.romildo@gmail.com">j.romildo@gmail.com</a>&gt;</span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hello.<br>
<br>
I would like to pretty print a tree in a way that its structure is<br>
easily perceived.<br>
<br>
For instance, consider the declarations:<br>
<br>
   data Node a = Node a [Node a]<br>
<br>
   type Tree a = [ Node a ]<br>
<br>
   t = [ Node &quot;a&quot; [ Node &quot;b&quot; []<br>
                  , Node &quot;c&quot; [ Node &quot;c1&quot; []<br>
                             , Node &quot;c2&quot; [] ]<br>
                  , Node &quot;d&quot; [ Node &quot;d1&quot; [ Node &quot;d1a&quot; [] ]<br>
                             , Node &quot;d2&quot; [] ] ] ]<br>
<br>
Then the resulting of pretty printing the given tree would be something<br>
like the following:<br>
<br>
       a<br>
       |<br>
+-------------+<br>
|    |        |<br>
b    c        d<br>
     |        |<br>
   +---+    +---+<br>
   |   |    |   |<br>
   c1  c2   d1  d2<br>
            |<br>
           d1a<br>
<br>
There is the module Text.PrettyPrint.HughesPJ, but it lacks examples on<br>
how to use the pretty print combinators, and it is not well docomented.<br>
<br>
I would like to see solutions for this problem, or clues on how to solve<br>
it.<br>
<br>
Regards,<br>
<br>
José Romildo<br>
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</blockquote></div><br></div><div><br></div><div><br></div>