lua: make sure lpeg is in fact optional #53

	name: Lua API

	on:
	push:
	paths:
	- 'vis-lua.c'
	- 'lua/**'

	jobs:
	luadoc:
	runs-on: ubuntu-latest
	steps:

	- name: Checkout
	uses: actions/checkout@v3

	- name: Dependency
	run: sudo apt install lua-ldoc

	- name: LDoc patch
	run: sudo patch -d /usr/share/lua/5.1 -p1 < lua/doc/README.md

	- name: Documentation generation
	run: make luadoc

	- name: Upload
	env:
	DEPLOY_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	run: \|
	git clone --depth=1 --single-branch --branch gh-pages "https://x-access-token:${DEPLOY_TOKEN}@github.com/${GITHUB_REPOSITORY}.git" /tmp/gh-pages
	git config --global user.name "${GITHUB_ACTOR}"
	git config --global user.email "${GITHUB_ACTOR}@users.noreply.github.com"
	mkdir -p /tmp/gh-pages/doc
	rm -f /tmp/gh-pages/doc/*
	cp -av lua/doc/*.html /tmp/gh-pages/doc/
	cp -av lua/doc/*.css /tmp/gh-pages/doc/
	cd /tmp/gh-pages
	git add -A && git commit --allow-empty -am "Publishing from ${GITHUB_REPOSITORY} ${GITHUB_SHA}"
	git push origin gh-pages

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