#!/bin/sh

set -e

revision_range="${1?revision range}"

total=0
valid=0

for rev in $(git rev-list --reverse "$revision_range"); do
	total=$((total + 1))
	title=$(git log --format='%s' -1 "$rev")

	author=$(git log --format='%aN <%aE>' -1 "$rev")
	git log --format="%(trailers:key=Signed-off-by,only,valueonly)" -1 "$rev" |
	grep -qFx "$author" || {
		echo "error: '$title' 'Signed-off-by: $author' trailer is missing" >&2
		continue
	}

	body=$(git log --format='%b' -1 "$rev")
	body=${body%$(git log --format='%(trailers)' -1 "$rev")}
	if [ "$(echo "$body" | wc -w)" -lt 3 ]; then
		echo "error: '$title' body has less than three words, please elaborate" >&2
		continue
	fi

	echo "ok: '$title'"
	valid=$((valid + 1))
done

if [ "$total" -eq 0 ]; then
	exit 0
fi

echo "$valid/$total valid patches"
if [ "$valid" -ne "$total" ]; then
	exit 1
fi