is there a way to keep the `sources` field default but w som Pants #general

is there a way to keep the `sources` field default...

ambitious-actor-36781

11/04/2021, 1:06 AM

is there a way to keep the

sources

field default, but w/ some extras?

hundreds-father-404

11/04/2021, 1:07 AM

there is not. Which target type?

ambitious-actor-36781

11/04/2021, 1:07 AM

python_sources

👍 1

ambitious-actor-36781

11/04/2021, 1:13 AM

would be cool if it was available in macros or something. so you could do

Copy code

def a_macro(...):
  python_sources(
    sources=python_sources.sources.default + ['!the_devil.py'],
  )

hundreds-father-404

11/04/2021, 1:26 AM

It is possible to do that via the Target API! Which is pretty light-weight and declarative, no need to use Rules etc See the tool tip "Using the fields of a pre-existing target type". https://www.pantsbuild.org/v2.8/docs/target-api-new-targets#step-1-define-the-target-type. You'd use all the same fields except for subclassing

PythonSourcesGeneratingSourcesField

w/ a different

default

class property

hundreds-father-404

11/04/2021, 1:26 AM

It does require that you use a new symbol in your BUILD files rather than

python_sources

tho, just like macros

ambitious-actor-36781

11/04/2021, 1:28 AM

oh, yeah, can do it that way

hundreds-father-404

11/04/2021, 1:31 AM

There's a gotcha that "PluginFields" will not be registered on your new target type, which are all the fields like

skip_flake8

and

skip_mypy

If you need those, *you'll have to include them in the

core_fields

of your target. They're not in the

PythonSourcesGeneratorTarget.core_fields

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