A vim plugin providing a single text object (on iv and av) for variable segments. A variable segment is defined to be a substring in any identifier character followed by an underscore ("snake case") or a lowercase identifier character followed by an uppercase character ("camel case").

E.g.:

foo_ba|r_baz    -> civquux -> foo_quux_baz
QU|UX_SPAM      -> civLOTS_OF -> LOTS_OF_SPAM
eggsAn|dCheese  -> civOr -> eggsOrCheese
_privat|e_thing -> civone -> _one_thing
foo_ba|r_baz    -> dav -> foo_baz
QU|UX_SPAM      -> dav -> SPAM
eggsAn|dCheese  -> dav -> eggsCheese
_privat|e_thing -> dav -> _thing

It will also preserve case for small camels when initial segments are deleted (with av):

_g|etJiggyYo   -> dav -> _jiggyYo

Requires vim-textobj-user.