For some time now, I'm notifying blo.gs about changes in the blog. After looking a bit into how search engines percieve my website recently, I learned that they also have some notification mechanisms for new pages/blogposts.

Thus I upgraded the oneliner into a dedicated script to notify external services about changes in the blog.
It is optimized for my Jekyll setup, where the generated pages in the _site folder are stored in git.
The notification ignores changes to summarized pages like rss.xml etc to only trigger notifications when there are changes in the original blog posts.

Here's the script, feel free to re-use (it expects to have MYDOMAIN, INDEXNOW_API_KEY and BING_API_KEY defined as environment variables):

#!/bin/bash

set -e
set -u
set -o pipefail

CHANGES="$(git diff --name-only HEAD HEAD~1 -- _site)"

# early abort if no changes on _site
if [ -z "$CHANGES" ] ; then
	echo "No changes in _site found"
	exit 0
fi

# build URL list
URLLIST="\"https://${MYDOMAIN}/\""
for f in $CHANGES ; do
	case "$f" in
		_site/robots.txt|_site/humans.txt|_site/about.html|_site/rss.xml|_site/atom.xml|_site/feed.json|_site/sitemap.xml)
			continue
		;;
		*)
			url=$(echo "$f"|sed -e "sX^_siteXhttps://${MYDOMAIN}X")
			URLLIST="${URLLIST},\"${url}\""
		;;
	esac
done

if [ "\"https://${MYDOMAIN}/\"" = "$URLLIST" ] ; then
	echo "No relevant changes in _site found, skipping notifications"
	exit 0
fi

# notify ping.blo.gs (Automattic) about updates
curl --fail -s -D - -X POST http://ping.blo.gs -H 'content-type: text/xml' --data "<?xml version=\"1.0\"?><methodCall><methodName>weblogUpdates.extendedPing</methodName><params><param><value>x-log</value></param><param><value>https://${MYDOMAIN}/</value></param><param><value></value></param><param><value>https://${MYDOMAIN}/rss.xml</value></param></params></methodCall>"

# report changed URLs to indexnow, include /indexnow canary URL
curl --fail -s -D - -X POST https://api.indexnow.org/IndexNow -H 'content-type: application/json; charset=utf-8' --data "{\"host\":\"${MYDOMAIN}\",\"key\":\"${INDEXNOW_API_KEY}\",\"urlList\":[${URLLIST},\"https://${MYDOMAIN}/indexnow\"]}"

# report changes URLs to bing, include /bingsubmit canary URL
curl --fail -s -D - -X POST "https://ssl.bing.com/webmaster/api.svc/json/SubmitUrlbatch?apikey=${BING_API_KEY}" -H 'content-type: application/json; charset=utf-8' --data "{\"siteUrl\":\"https://${MYDOMAIN}\",\"urlList\":[${URLLIST},\"https://${MYDOMAIN}/bingsubmit\"]}"