inbox_diff.sh

inbox_blobs() {
  git ls-tree -r master | grep 'INBOX' | awk '{print $3}' | sort
}

diff <(cd ../Gmail && inbox_blobs) <(inbox_blobs) | grep '<\|>' | while read marker hash; do
  echo "$marker $(git show $hash | grep -m 1 '^Subject:')"
done | sort

output.txt

< Subject: Re: LLC intake form
< Subject: Mail dates are wrong after IMAP sync [Ticket Id: 401841]
> Subject: IMAP Migration report
> Subject: Welcome to NDC London - 4-6 December