BUILD.tools

# This turns e.g. 2.10.6 into 2_10, which is the format required for scalastyle
scala_major = Versions.get('scala')
scala_major = scala_major[0:scala_major.rfind('.')].replace('.', '_')
target(name='scalastyle_' + scala_major,
  dependencies=[
    '3rdparty/org/scalastyle:scalastyle',
  ]
)

pants.ini

backend_packages: +[
    "scalastyle",
]

[compile.scalastyle]
config: scalastyle-config.xml

register.py

from __future__ import (absolute_import, division, generators, nested_scopes, print_function,
                        unicode_literals, with_statement)
from pants.backend.jvm.tasks.scalastyle import Scalastyle
from pants.goal.task_registrar import TaskRegistrar as task


def register_goals():
  task(name='scalastyle', action=Scalastyle).install('compile')