[Haskell-beginners] Flying Dutchman sailing blind

[Stephen Tetley]

On 5 October 2010 09:06, Jeroen van Maanen <jeroen at lexau.org> wrote:

>
> P.S. For an idea of what is living in the snail pit, have a look at:
>
>  http://lexau.svn.sourceforge.net/viewvc/lexau/branches/totem/src/LExAu/Pipeline/Concurrent.hs?view=markup
>  http://lexau.svn.sourceforge.net/viewvc/lexau/branches/totem/src/LExAu/Model/HistoryTree.hs?view=markup
>
> (I know, HistoryTree.hs badly needs to be split up into smaller modules.)

A minor style tip...

You are using ShowS family functions (showString, showChar) to
generate strings which is good as it avoids (++). However, to make the
code clearer you might want to code up a little helper library with
ShowS versions of the usual pretty print combinators.

e.g. all the functions like parens:

parens :: ShowS -> ShowS
parens s = showChar '(' . s . showChar ')'


Having a library of these functions usually pays off (I think there is
one on Hackage but I can't remember its name). You could use a pretty
printing library, but they are somewhat less efficient as the have to
do work measuring line lengths for fitting lines to screen width.

Best wishes

Stephen