feat: hatchling edit

[henryiii]

Editable support for the hatchling plugin.

🤖 Assisted-by: Copilot:GPT-5.4

[henryiii]

@LecrisUT Any thoughts as to why just the one fedora test might be failing here? It's on the new code, so it looks valid.

[LecrisUT]

Oh interesting. The only difference that should be there are the compilers. I'll need to dig into the code changes.

Btw tmt is meant to be replicable locally, but we do not have mac users or CI to test it on, but if you have docker/podman and tmt installed (even from pypi), the following would replicate that job

$ tmt run -a \
  provision --how=container --image=fedora:rawhide \
  plans --name=/tests/plans/pytest \
  login -t

[LecrisUT]

Ok, I am reproducing locally. My suspicion is that EXT_SUFFIX gets calculated a bit differently so the file is not as expected, but let me see with the debugger.

[LecrisUT]

Oops, wrong finding previously:

• ext_location = '/tmp/pytest-of-cle/pytest-2/test_hatchling_editable_instal0/venv/lib/python3.14/site-packages/hatchling_example/_core.cpython-314-x86_64-linux-gnu.so'
• expected = '/tmp/pytest-of-cle/pytest-2/test_hatchling_editable_instal0/venv/lib64/python3.14/site-packages/hatchling_example/_core.cpython-314-x86_64-linux-gnu.so'

see the lib vs lib64 difference there

[Copilot]

Pull request overview

Adds initial support and test coverage for building editable wheels via the Hatchling hook integration, extending scikit-build-core’s Hatch plugin to handle PEP 660-style editable outputs (redirect/inplace) and validating resulting wheel metadata and contents.

Changes:

• Extend ScikitBuildHook (Hatch plugin) to support version="editable" builds, including redirect/inplace modes and correct pure_python/WHEEL metadata handling.
• Refactor editable-wheel file generation into reusable helpers (editable_redirect_files, editable_inplace_files, get_packages) and reuse them in the PEP 517 wheel builder.
• Add Hatchling-focused tests (editable wheel build + editable install) and adjust the Hatchling test package CMakeLists to support editable inplace output paths.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/test_hatchling.py	Adds assertions for wheel Root-Is-Purelib, plus new editable wheel and editable install integration tests for Hatchling hook behavior.
tests/packages/hatchling/cpp/CMakeLists.txt	Ensures editable inplace builds place built extension outputs in the expected source-package directory, including multi-config generator handling.
src/scikit_build_core/hatch/plugin.py	Implements Hatchling editable wheel support (redirect/inplace), updates config/state handling, and sets correct pure_python behavior.
src/scikit_build_core/build/wheel.py	Refactors editable wheel generation to use new helper functions and shared package discovery.
src/scikit_build_core/build/_editable.py	Introduces helper functions for generating editable wheel files and package discovery to share logic across builders.

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