install bash completions for package
dh_bash-completion [debhelper options]
dh_bash-completion is a debhelper program that is responsible for installing completions for bash, usable installing the "bash- completion" package. If a file named debian/package.bash-completion exists, then different actions are performed, depending on its format. It can be a proper completion snippet, and in that case it would be installed in the completion directory, and no other actions would be performed. It can also be a list of files, with an optionally specified name to call the completion snippet after. The file format is as follows: my/path/to/foo-completion # this would be installed as "foo-completion" my/path/to/bar-completion baz # this would be installed as "baz"