#!/bin/bash

COMMIT_REGEX='\[\ .*\ \] .*'
read -r -d '' ERROR_MESSAGE << END_OF_VAR
Aborting commit. Commit message did not match commit regex: \"${COMMIT_REGEX}"

Template:
    [ Modified Module/Feature ] Short Message (required)

Example Valid Commit Message:
    [ Neovim ] Updated Packer Lazy Loading for Treesitter for BufEnter Events
END_OF_VAR

COMMIT_MESSAGE="$(cat "${1}")"

IFS=$'\n' read -ra COMMIT_MESSAGE_SPLIT -d $'\0' <<< "${COMMIT_MESSAGE}"

if (( "${#COMMIT_MESSAGE_SPLIT[0]}" > 72 )); then
    echo "Your first line commit is too long, max 72 characters, got ${#COMMIT_MESSAGE_SPLIT[0]}"
    exit 1
fi

if [[ ! "$(cat "${1}")" =~ ${COMMIT_REGEX} ]]; then
    echo "${ERROR_MESSAGE}" >&2
    exit 1
fi