jamesallardice/grunt-append-sourcemapping — pull request #2 by tgirardi (2014-03-05 15:38:01+00:00)
Title: Avoid re-appending

Avoid appending the sourcemapping URL comment more than once.

Read the targeted JS file and, if the mentioned comment is already
present, it
is not appended again. Check the existance of the comment using a
regexp.