sdiff Enhancement Guidance?

[Grant Stevens]

Hello!
   
  A project I worked recently required me to build an enhancement to sdiff. I'd 
like to contribute the enhancement to GNU diffutils. Can someone guide me 
through the process?
   
  Details:
   
  Suppose we sdiff these two files:
$ cat file1
line1
close but not exact
another not exact
last line
$ cat file2
line1
line2
close but inexact
line3
line4
another inexact
last line
$ diff -W 43 -y file1 file2
line1                   line1
close but not exact  |  line2
another not exact    |  close but inexact
                     >  line3
                     >  line4
                     >  another inexact
last line               last line
   
  But I needed a tighter line-matching that would detect
similar-but-not-identical lines and associate them. The
resulting output looks like this:
$ diff -W 43 -Y file1 file2 # (-Y = -y option, enhanced for tighter matching)
line1                   line1
                     >  line2
close but not exact  |  close but inexact
                     >  line3
                     >  line4
another not exact    |  another inexact
last line               last line
   
  Notice that the similar lines are shown together.

 
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