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tdiff's Issues

Using whitespace tweak to break ambiguity?

When comparing source code, it would be more natural (or convenient) to have:

[{eq,"A"},{ins," "},{eq,"/"},{ins," "},{eq,"B"},{del," "}] = tdiff:diff("A/B ", "A / B").
[{eq,"C("},{ins," "},{eq,"D"},{del," "}] = tdiff:diff("C(D ", "C( D").
[{eq,"E"},{ins," "},{eq,"+"},{del," "},{eq,"F"},{del," "}] = tdiff:diff("E+ F ", "E +F").

instead of the current diff output

[{eq,"A"},{ins," "},{eq,"/"},{del,"B"},{eq," "},{ins,"B"}] = tdiff:diff("A/B ", "A / B").
[{eq,"C("},{del,"D"},{eq," "},{ins,"D"}] = tdiff:diff("C(D ", "C( D").
[{eq,"E"},{del,"+"},{eq," "},{ins,"+"},{eq,"F"},{del," "}] = tdiff:diff("E+ F ", "E +F").

This somehow corresponds to giving less weight to whitespace changes when counting the 'edit cost'.
Since whitespace is lexically smaller than other text, it could be possible to favor whitespace changes without braking the code when no ambiguity exists.

Alternatively, it might be possible to favor the diff output which maximize the number of equal terms (also only if there is ambiguity).

Any idea where in the code to do this tweak?

Upload to Hex.pm

I'm publishing Unite which depends on tdiff to Hex.pm. It would be very helpful if tdiff also existed on Hex.pm. Would it be possible for you to upload it? Alternatively, I can also fork it and upload it if you approve of that.

diff_binaries does not seem to work as I expected

Here are a couple of test cases

t100() ->
    Old = "A cat ate my hat", 
    New = "A dog ate my shoe",
    P = tdiff:diff(Old, New),
    New = tdiff:patch(Old, P),
    yes.

t101() ->
    Old = <<"A cat ate my hat">>, 
    New = <<"A dog ate my shoe">>,
    P = tdiff:diff_binaries(Old, New),
    New = tdiff:patch(Old, P),
   yes.

This is what happens when I run them

   1> test_tdiff:t100().   
  yes
  2> test_tdiff:t101().
  ** exception error: no match of right hand side value ["A dog ate my shoe"]
      in function  test_tdiff:t101/0 (test_tdiff.erl, line 18)

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