I love typos #33

	name: CI

	on:
	push:
	branches-ignore: gh-pages
	pull_request:
	branches-ignore: gh-pages

	jobs:
	deploy:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2

	- name: Create gh-pages directory
	run: mkdir -p generation/gh-pages

	- name: Install dependencies
	run: sudo apt-get install m4 graphviz

	- name: "Generate C++20 flowcharts"
	run: \|
	set -eu -o pipefail

	out='generation/gh-pages/std-2020'
	mkdir -- "$out"

	m4 cpp20/flowchart.dot.m4 \| dot -Tsvg -start=1000 > "$out"/initialization.svg
	m4 cpp20/flowchart.dot.m4 \| dot -Tpng -start=1000 > "$out"/initialization.png

	- name: "Generate C++23 flowcharts"
	run: \|
	set -eu -o pipefail

	out='generation/gh-pages/std-2023'
	mkdir -- "$out"

	cpp23/build.sh "$out"/initialization.svg "$out"/initialization.png

	- name: Deploy generated flowcharts to Github Pages
	if: github.ref == 'refs/heads/main'
	run: \|
	# Set Git committer identity
	git config user.name "ci-build"
	git config user.email "[email protected]"

	# Clear the index
	EMPTY_TREE="$(git hash-object -t tree /dev/null)"
	git read-tree -- "$EMPTY_TREE"

	# Add site data to index
	git add generation/gh-pages

	git fetch origin gh-pages
	ORIG_SITE_TREE="$(git rev-parse origin/gh-pages^{tree})"
	NEW_SITE_TREE="$(git write-tree --prefix=generation/gh-pages)"

	if [ "$ORIG_SITE_TREE" != "$NEW_SITE_TREE" ]; then
	SITE_COMMIT="$(git commit-tree -p origin/gh-pages -m "CI updates" -- "$NEW_SITE_TREE")"
	echo Updating GitHub pages site to commit "$SITE_COMMIT"
	git push origin "$SITE_COMMIT":gh-pages
	else
	echo Not updating GitHub pages site
	fi

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