#!/bin/sh
# Conventional Commits validation hook
# https://www.conventionalcommits.org/

commit_msg_file="$1"
commit_msg=$(cat "$commit_msg_file")

# Skip merge commits
if echo "$commit_msg" | grep -qE "^Merge "; then
  exit 0
fi

# Conventional commit pattern
# type(scope)?: description
# type!: breaking change
pattern="^(feat|fix|docs|style|refactor|perf|test|build|ci|chore|revert)(\(.+\))?\!?: .{1,}"

if ! echo "$commit_msg" | grep -qE "$pattern"; then
  echo ""
  echo "ERROR: Commit message does not follow Conventional Commits format."
  echo ""
  echo "Your message:"
  echo "  $commit_msg"
  echo ""
  echo "Expected format:"
  echo "  type(scope)?: description"
  echo ""
  echo "Types: feat, fix, docs, style, refactor, perf, test, build, ci, chore, revert"
  echo ""
  echo "Examples:"
  echo "  feat: add user authentication"
  echo "  fix(api): handle null response"
  echo "  docs: update README"
  echo "  feat!: breaking change to API"
  echo ""
  exit 1
fi