Merge pull request #37 from COMP1511UNSW/dylanb/fix-generate_expected… #166

	name: auto-blacken
	on: [push, pull_request]
	jobs:
	# job skipper in the case of concurrent push + pull_request trigger
	pre_job:
	runs-on: ubuntu-latest
	outputs:
	should_skip: ${{steps.skip_check.outputs.should_skip}}
	steps:
	- id: skip_check
	uses: fkirc/skip-duplicate-actions@master
	with:
	concurrent_skipping: 'same_content'
	do_not_skip: '["push"]'

	# actual autoblacken
	main_job:
	name: runner / black
	needs: pre_job
	if: ${{needs.pre_job.outputs.should_skip != 'true'}}
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	if: github.event_name == 'pull_request'
	with:
	fetch-depth: 0
	ref: ${{github.event.pull_request.head.ref}}
	- uses: actions/checkout@v2
	if: github.event_name == 'push'
	with:
	fetch-depth: 0
	- name: Check files using the black formatter
	uses: rickstaa/action-black@v1
	id: action_black
	with:
	black_args: "."
	- name: Create commit on changes
	if: steps.action_black.outputs.is_formatted == 'true'
	run: \|
	git config --global user.name '${{github.actor}}'
	git config --global user.email '${{github.actor}}@users.noreply.github.com'
	git commit -am ":art: Format Python code with psf/black" -m "There appear to be some python formatting errors in ${{github.sha}}."
	git push

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