Update Submodules #45

	name: Update Submodules

	on:
	schedule:
	# Run at 2:00 AM UTC every day
	- cron: '0 2 * * *'
	workflow_dispatch: # Allow manual trigger

	jobs:
	update-submodules:
	runs-on: ubuntu-latest
	permissions:
	contents: write
	steps:
	- name: Checkout repository
	uses: actions/checkout@v3
	with:
	# Fetch all history for all branches and tags
	fetch-depth: 0
	# Get submodules
	submodules: 'recursive'

	- name: Set up Git
	run: \|
	git config --global user.name 'Read the Docs Bot'
	git config --global user.email '[email protected]'

	- name: Get default branch
	id: default_branch
	run: \|
	DEFAULT_BRANCH=$(git remote show origin \| grep 'HEAD branch' \| cut -d' ' -f5)
	echo "name=$DEFAULT_BRANCH" >> $GITHUB_OUTPUT

	- name: Checkout default branch
	run: \|
	git checkout ${{ steps.default_branch.outputs.name }}

	- name: Update submodules
	run: \|
	git submodule update --remote --recursive

	- name: Check if submodules changed
	id: check_changes
	run: \|
	git add -A

	# Check if the index differs from HEAD
	# git diff --cached --quiet exits 0 if no diff, 1 if diff
	if ! git diff --cached --quiet; then
	echo "Changes detected in submodule references."
	echo "changes=true" >> $GITHUB_OUTPUT
	else
	echo "No changes detected in submodule references."
	echo "changes=false" >> $GITHUB_OUTPUT
	# If no changes, reset the index in case unrelated changes were staged
	git reset HEAD --quiet
	fi

	- name: Commit and push changes
	if: steps.check_changes.outputs.changes == 'true'
	run: \|
	git commit -m "Auto-update submodules"
	git push origin ${{ steps.default_branch.outputs.name }}

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