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#!/usr/bin/env bash
# the file containing the commit message is passed as the first argument
commit_file="$1"
commit_message=$(cat "$commit_file")
error() {
echo -e "\033[0;31m$1:\033[0m"
echo "$commit_message"
exit 1
}
# fail if the commit message contains windows style line breaks (carriage returns)
if grep -q -U $'\x0D' "$commit_file"; then
error "Commit message contains CRLF line breaks (only unix-style LF linebreaks are allowed)"
fi
line_number=0
while read -r line; do
# break on git cut line, used by git commit --verbose
if [[ "$line" == "# ------------------------ >8 ------------------------" ]]; then
break
fi
# ignore comment lines
[[ "$line" =~ ^#.* ]] && continue
((line_number += 1))
line_length=${#line}
category_pattern="^\S.*?\S: .+"
if [[ $line_number -eq 1 ]] && (echo "$line" | grep -P -v -q "$category_pattern"); then
error "Missing category in commit title (if this is a fix up of a previous commit, it should be squashed)"
fi
title_case_pattern="^\S.*?: [A-Z0-9]"
if [[ $line_number -eq 1 ]] && (echo "$line" | grep -P -v -q "$title_case_pattern"); then
error "First word of commit after the subsystem is not capitalized"
fi
if [[ $line_number -eq 1 ]] && [[ "$line" =~ \.$ ]]; then
error "Commit title ends in a period"
fi
url_pattern="([a-z]+:\/\/)?(([a-zA-Z0-9_]|-)+\.)+[a-z]{2,}(:\d+)?([a-zA-Z_0-9@:%\+.~\?&\/=]|-)+"
if [[ $line_length -gt 72 ]] && (echo "$line" | grep -P -v -q "$url_pattern"); then
error "Commit message lines are too long (maximum allowed is 72 characters)"
fi
done <"$commit_file"
exit 0
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