git diff with --word-diff

gistfile1.txt

$ git diff HEAD^ HEAD
diff --git a/foo.txt b/foo.txt
index fbe6624..1803e6a 100644
--- a/foo.txt
+++ b/foo.txt
@@ -1 +1 @@
-Ceci est une poule.
+Ceci est un poulet.


$ git diff --word-diff=plain HEAD^ HEAD
diff --git a/foo.txt b/foo.txt
index fbe6624..1803e6a 100644
--- a/foo.txt
+++ b/foo.txt
@@ -1 +1 @@
Ceci est [-une poule.-]{+un poulet.+}