[plt-scheme] s-expr differ

This kind of thing could be useful for two different places in our  
tool suite:

1. the test suite system, whatever comes out of that working group (I  
am sorry for using a Scheme word):

-- when tests involve 'complex' S-expressions, a colorful diff would  
make the comparison more efficient. 

2. the contract system (though this is not quite the same!!)

-- when a contract fails, see where the test fails the S-exp grammar  
of a contract
-- the xml library and its x-expr interface is a particularly good  
example 

(Of course our two steppers might benefit, too, and as Robby says,  
Redex needs it/has it.)

-- Matthias









On Oct 1, 2009, at 6:04 PM, Jon Rafkind wrote:

> I wrote a little program to highlight the differences in s- 
> expressions. Right now it only works in xterm but if anyone cares  
> about it I can probably get it to work in other terms and drscheme.
>
> Here it is working in xterm (yes my theme is xp):
>
> http://www.cs.utah.edu/~rafkind/tmp/diff/diff.png
>
> Code is there too
>
> http://www.cs.utah.edu/~rafkind/tmp/diff/
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