Fix #142 #44

	name: Build documentation

	on:
	pull_request:
	types: [closed]
	branches:
	- master
	# Only run the workflow when the pull request is merged
	# and not when it is closed without merging
	# To achieve this we can check the pull_request.merged flag
	# and ensure it is true
	# https://docs.github.com/en/actions/reference/context-and-expression-syntax-for-github-actions#github-context
	# https://docs.github.com/en/actions/reference/events-that-trigger-workflows#pull_request
	# https://docs.github.com/en/actions/reference/context-and-expression-syntax-for-github-actions#pull_requestmerged
	# https://docs.github.com/en/actions/reference/context-and-expression-syntax-for-github-actions#booleans
	if: github.event.pull_request.merged == true

	jobs:

	docs:

	runs-on: ubuntu-latest

	env:
	GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}

	steps:

	- uses: actions/[email protected]
	with:
	submodules: 'recursive'

	- run: \|
	sudo apt install doxygen graphviz -y

	- run: \|
	cd doc/
	python gen_mainpage.py
	doxygen

	- run: \|
	cd doc/html
	git init
	touch .nojekyll
	git add -A
	git config --local user.email "[email protected]"
	git config --local user.name "GitHub Action"
	git commit -m 'deploy'

	- uses: ad-m/[email protected]
	with:
	github_token: ${{ secrets.GITHUB_TOKEN }}
	branch: gh-pages
	force: true
	directory: ./doc/html

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