Add generic comment on PR script #102

	name: Diff changes to dist

	on:
	pull_request:
	paths: ['dist/**']

	permissions:
	pull-requests: write

	jobs:
	generate-diff:
	name: Generate Diff
	runs-on: ubuntu-latest

	# Skip when token write permissions are unavailable on forks
	if: ${{ !github.event.pull_request.head.repo.fork }}

	steps:
	- uses: actions/checkout@v3
	with:
	fetch-depth: 0 # Need to also checkout the base branch to compare

	- name: Setup Node.js
	uses: actions/setup-node@v3
	with:
	cache: npm
	node-version-file: .nvmrc

	- name: Set up diff drivers
	run: \|
	npm install -g js-beautify
	git config diff.minjs.textconv js-beautify
	git config diff.mincss.textconv js-beautify

	- name: Generate diff
	id: diff
	run: \|
	# Using `origin/$GITHUB_BASE_REF` to avoid actually checking out the branch
	# as all we need is to let Git diff the two references
	bin/dist-diff.sh origin/$GITHUB_BASE_REF $GITHUB_WORKSPACE

	- name: Save distribution diffs
	uses: actions/upload-artifact@v3
	with:
	name: Dist diff
	path: dist*.diff
	if-no-files-found: ignore

	- name: Add comment to PR
	uses: actions/github-script@v6
	with:
	github-token: ${{secrets.GITHUB_TOKEN}}
	script: \|
	const { readFile } = require('node:fs/promises')
	const { commentOnPr } = await import('${{ github.workspace }}/.github/workflows/scripts/comments.mjs')

	// Read diff from previous step
	const diffText = await readFile('${{ github.workspace }}/dist.diff', 'utf8')

	// Add or update comment on PR
	await commentOnPr({ github, context }, 'Diff release', '## Changes to dist\n' +
	'```diff\n' +
	`${diffText}\n` +
	'\nSHA: ${{ github.sha }}\n' +
	'```'
	)

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