add format check action - initial repo format #20

	name: JuliaFormatter

	on:
	pull_request:
	push:
	branches: [master]

	concurrency:
	group: ${{ github.workflow }}-${{ github.head_ref \|\| github.run_id }}
	cancel-in-progress: true

	jobs:
	check:
	runs-on: ubuntu-latest
	steps:
	- uses: julia-actions/setup-julia@latest
	with:
	version: '1'
	- uses: actions/checkout@v3
	- name: Install JuliaFormatter and format
	shell: julia --project=@. --color=yes {0}
	run: \|
	using Pkg
	Pkg.activate(; temp=true)
	Pkg.add("JuliaFormatter")
	using JuliaFormatter
	format(".", verbose=true)
	- name: Format check
	run: \|
	julia -e '
	out = Cmd(`git diff --name-only`) \|> read \|> String
	if out == ""
	exit(0)
	else
	@error "Some files have not been formatted !!!"
	write(stdout, out)
	exit(1)
	end
	'

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