add main app file #47

	---
	# This workflow tests that the generated HTML file and the main index contain
	# the same content. Even though `diff` is told to ignore whitespace, it will
	# fail if a comma is placed on a newline. `sed` is used to remove all newlines
	# that are followed by a comma, before running `diff`.
	name: Compare generated and index HTML

	# yamllint disable-line rule:truthy
	on:
	pull_request:
	paths:
	- '.github/workflows/diff-generated-file.yml'
	- 'www/api/data/generated.html'
	- 'www/index.html'
	push:
	paths:
	- '.github/workflows/diff-generated-file.yml'
	- 'www/api/data/generated.html'
	- 'www/index.html'
	# Allow manually triggering the workflow.
	workflow_dispatch:

	# Cancels all previous workflow runs for the same branch that have not yet completed.
	concurrency:
	# The concurrency group contains the workflow name and the branch name.
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	diff:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: diff
	run: \|
	diff \
	--ignore-all-space \
	--ignore-blank-lines \
	--label='www/api/data/generated.html' \
	--report-identical-files\
	--unified=0 \
	<(cat www/api/data/generated.html \| sed -zE 's/\n\s+,/,/g') \
	www/index.html

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