Enhanced flexibility when creating environments

[lfvjimisola]

Have a use-case that I can't see works with hatch (multiple inheritance). The challenge here is really if one wants the lint environment to be detached.

Would like to have three environments: default, dev and lint where

lint = black, flake8 etc
dev = default + lint

i.e.

dependencies = [
  "ruamel.yaml==0.18.6",
]

[tool.hatch.envs.lint]
detached = true
dependencies = [
  "black==24.8.0",
  "flake8==7.1.1",
  "flake8-pyproject==1.2.3",
  "mypy==1.11.1",
]

[tool.hatch.envs.dev]
template = ["default", "lint"]
dependencies = ["pytest==8.3.2", "pytest-sugar==1.0.0", "pytest-cov==5.0.0"]

Would need to do something like below as we need to keep environments lint and test a while for backwards CI/CD compatibility. That is, dev would have to use several templates (multiple inheritance). Dependencies should be prioritized according to order in template(s) = "default, lint, test"

dependencies = [
  "ruamel.yaml==0.18.6",
]

[tool.hatch.envs.test]
dependencies = ["pytest==8.3.2", "pytest-sugar==1.0.0", "pytest-cov==5.0.0"]

[tool.hatch.envs.lint]
detached = true
dependencies = [
  "black==24.8.0",
  "flake8==7.1.1",
  "flake8-pyproject==1.2.3",
  "mypy==1.11.1",
]

[tool.hatch.envs.dev]
template = "default, lint, test" # default, might not be needed since its inherited by test

If one is ok with linting not being detached then the following would work:

dependencies = [
  "ruamel.yaml==0.18.6",
]

[tool.hatch.envs.dev]
dependencies = [
  "pytest==8.3.2",
  "pytest-sugar==1.0.0",
  "pytest-cov==5.0.0".
  "black==24.8.0",
  "flake8==7.1.1",
  "flake8-pyproject==1.2.3",
  "mypy==1.11.1",
]

[jimisola]

@ofek Do you or someone else have the time to look at and answer on this matter?