This requires `yq`, `diff`, and `bash`

diff-yaml.sh

#!/bin/bash

FILE=${1:-0}

if [ "${FILE}" = "0" ]; then
	echo "need to specify a file"
	exit 1
fi

fileNo=$(ls $FILE-split | wc -l | awk '{print $1}')
fileNo=$((fileNo-1))
last=0
for i in $(seq 0 $fileNo); do
	echo Diff of $FILE-split/$last.yaml and $FILE-split/$i.yaml:
	diff -C 5 $FILE-split/$last.yaml $FILE-split/$i.yaml
	last=$i
done

split-yaml.sh

#!/bin/bash

set -e

FILE=${1:-0}

if [ "${FILE}" = "0" ]; then
	echo "need to specify a yaml file"
	exit 1
fi

mkdir -p $FILE-split

IFS=''
fileIndex=0
while read -r i; do
	if [ "${i}" = "---" ]; then
		fileIndex=$((fileIndex+1))
	fi
	echo "${i}" >> $FILE-split/$fileIndex.yaml
done <$FILE