peek output for target generators like python_tests do not include relevant goals

[huonw]

Is your feature request related to a problem? Please describe.

As of #20331, peek now can indicate some goals that apply for some targets (very cool). It looks like this mostly works for single-file targets, not generators like python_tests. Those generators are valid sources of some goals (e.g. test, lint etc.), although not all goals that they're isolated files are valid for (e.g. run only works with one file).

In https://github.com/pantsbuild/example-python (at 55cf90bc4a1e4ccc47749aa39d299b5dace79adc), running PANTS_VERSION=2.21.0a0 pants peek --exclude-defaults helloworld/greet:tests helloworld/greet/greeting_test.py (--exclude-defaults just to make this output nicer):

[
  {
    "address": "helloworld/greet:tests",
    "target_type": "python_tests",
    "dependencies": [
      "helloworld/greet/greeting_test.py:tests"
    ],
    "sources": [
      "helloworld/greet/greeting_test.py"
    ],
    "sources_fingerprint": "2158e096d5ab63e537d88067b50a0274b83f6373143faf854d4a9adf5d01cf78"
  },
  {
    "address": "helloworld/greet/greeting_test.py:tests",
    "target_type": "python_test",
    "dependencies": [
      "helloworld/greet/greeting.py:lib"
    ],
    "goals": [
      "run",
      "test"
    ],
    "source_raw": "greeting_test.py",
    "sources": [
      "helloworld/greet/greeting_test.py"
    ],
    "sources_fingerprint": "2158e096d5ab63e537d88067b50a0274b83f6373143faf854d4a9adf5d01cf78"
  }
]

Note that:

• helloworld/greet:tests has no goals key
• helloworld/greet/greeting_test.py:tests does have one

Describe the solution you'd like

Include appropriate goals output for target generators too, somehow.

Describe alternatives you've considered
N/A

Additional context
N/A

[sureshjoshi]

Man, what a swing and a miss on my part - I didn't even think about generators honestly.

I guess that explains a weird artifact in the vscode plugin I just noticed (why I wasn't getting code lens support for python_tests). I just assumed it was the plugin's fault and went on with my day.

But, on the plus side - goals does let me do something super dope like this:

Anyways, I'm back on the vscode plugin tomorrow - so I'll probably try to tackle this bug in the next week or so.

[huonw]

That is cool! Doesn't seem like a miss to me, just a feature delivered over several incremental steps 😄

[sureshjoshi]

Yeahhh... Let's go with that 😆