A better git diff --word-diff (--word-diff-regex) ?

Hi,

is there a way to configure --word-diff to be a more programming language friendly? For example if I add one parameter to a function declaration, I'd like to see only the addition of the parameter as the change. But currently it shows much more.

For example if
  void foo(int x);
is changed to
  void foo(int x, int y);
I'd like to see only ",int y" as the change, not "x, int y);".

I think I'd like to ignore all white spaces and tokenize text on word boundaries and see the diff between the tokens. This way if I e.g. add a missing ";" it'll be shown as the only change.

$ echo 'void foo(int x);' > foo.c && git add foo.c && git commit -m "foo"
[master (root-commit) 5af60cb2] foo
 1 files changed, 1 insertions(+), 0 deletions(-)
 create mode 100644 foo.c

$ echo 'void foo(int x, int y);' > foo.c && git diff --word-diff