Itertools #44

	name: Type annotation (PR)

	on:
	pull_request:
	paths:
	- 'datasalad/**.py'
	- '!/tests/.py'

	jobs:
	check:
	runs-on: ubuntu-latest
	steps:
	- name: Setup Python
	uses: actions/setup-python@v5
	with:
	# run on a "fresh" python, but see mypy flag to check for the oldest supported version
	python-version: 3.12
	architecture: x64
	- name: Checkout
	uses: actions/checkout@v4
	- name: Install hatch (which pull mypy)
	run: python -m pip install hatch
	- name: Get Python changed files
	id: changed-py-files
	uses: tj-actions/changed-files@v44
	with:
	files: \|
	*.py
	*/.py
	- name: Type check changed files
	if: steps.changed-py-files.outputs.any_changed == 'true'
	run: \|
	# get any type stubs that mypy thinks it needs
	hatch run types:mypy --install-types --non-interactive --follow-imports skip ${{ steps.changed-py-files.outputs.all_changed_files }}
	# run mypy on the modified files only, and do not even follow imports.
	# this results is a fairly superficial test, but given the overall
	# state of annotations, we strive to become more correct incrementally
	# with focused error reports, rather than barfing a huge complaint
	# that is unrelated to the changeset someone has been working on.
	# run on the oldest supported Python version
	hatch run types:mypy --python-version 3.8 --follow-imports skip --pretty --show-error-context ${{ steps.changed-py-files.outputs.all_changed_files }}

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