Detect deletion of slides #2

	name: Verify Deleted Slide Entries

	on:
	push:
	branches:
	- main
	pull_request:
	types:
	- opened
	- synchronize

	jobs:
	verify-deleted-slides:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout code
	uses: actions/checkout@v2

	- name: Install dependencies
	run: \|
	# Install your dependencies here.

	- name: Check if it's a pull request event
	id: check-pr-event
	run: \|
	if [ -n "$GITHUB_EVENT_NAME" ] && [ "$GITHUB_EVENT_NAME" == "pull_request" ]; then
	echo "is_pull_request=true" >> $GITHUB_ENV
	else
	echo "is_pull_request=false" >> $GITHUB_ENV
	fi

	- name: Get base branch
	id: base-branch
	run: \|
	is_pull_request="${{ env.is_pull_request }}"
	if [ "$is_pull_request" == "true" ]; then
	base_branch=$(jq -r .pull_request.base.ref "$GITHUB_EVENT_PATH")
	echo "base_branch=$base_branch" >> $GITHUB_ENV
	else
	echo "base_branch=" >> $GITHUB_ENV
	fi

	- name: Set deleted slides in an environment file
	run: \|
	base_branch="${{ env.base_branch }}"
	if [ -n "$base_branch" ]; then
	echo "DELETED_SLIDES=$(git diff --name-only \"$base_branch\"...HEAD --diff-filter=D)" >> $GITHUB_ENV
	fi

	- name: Check for entries in book.toml
	run: \|
	deleted_slides="$DELETED_SLIDES"

	for slide in $deleted_slides; do
	slide_filename=$(basename -- "$slide")
	slide_name="${slide_filename%.*}"
	entry_exists=$(grep -c "\[slide.$slide_name\]" book.toml)
	if [ $entry_exists -eq 0 ]; then
	echo "Error: Entry for slide $slide_name not found in book.toml"
	exit 1
	fi
	done

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