In recent buildifier versions, lint errors can be fixed automatically:
$ find . \( -name BUILD -o -name "*.bzl" \) -print \
| xargs buildifier --lint=fix
This commit was created with Buildifier version 0.19.2:
$ buildifier --version
buildifier version: 0.19.2
buildifier scm revision: d39e4d5c25111527369142f16cdb49aa67707313
Change-Id: I1f06cd4596e794981ccc2d9fc2d1da9b17f3973a