#!/bin/sh

set -e

revision_range="${1?revision range}"

valid=0
total=$(git rev-list --reverse "$revision_range" | wc -l)
if [ "$total" -eq 0 ]; then
	exit 0
fi

n=0
for rev in $(git rev-list --reverse "$revision_range"); do
	n=$((n + 1))
	title=$(git log --format='%s' -1 "$rev")
	fail=false

	if [ "$(echo "$title" | wc -m)" -gt 72 ]; then
		echo "error [PATCH $n/$total] '$title' title is longer than 72 characters, please make it shorter" >&2
		fail=true
	fi

	author=$(git log --format='%an <%ae>' -1 "$rev")
	if ! git log --format="%(trailers:key=Signed-off-by,only,valueonly)" -1 "$rev" |
			grep -qFx "$author"; then
		echo "error [PATCH $n/$total] '$title' 'Signed-off-by: $author' trailer is missing" >&2
		fail=true
	fi

	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 [PATCH $n/$total] '$title' body has less than three words, please describe your changes" >&2
		fail=true
	fi

	if [ "$fail" = true ]; then
		continue
	fi
	echo "ok    [PATCH $n/$total] '$title'"
	valid=$((valid + 1))
done

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