check_directory_tree.sh

HAS_ERROR=0

check_file() {
  local filepath=$1
  local has_frontmatter_title=0
  local has_ending=0
  local has_beginning=0

  [[ ! $filepath =~ ^(\.?[a-z0-9-]+\/)+(ru|index|en)\.md$ ]] \
    && echo "$filepath bad_branch_name Check a directory tree, branch should be named only with lowercase letters (a-z), numbers (0-9) and hyphens (-), file should be named as %locale%.md (ru.md, e.g.)" \
    && HAS_ERROR=1

  if grep -q -E '^# .+$' "$filepath"; then
    # has a markdown first level header in file
    return
  fi

  # iterate line by line

  while IFS="" read -r line || [ -n "$line" ]
  do
    if [ "$line" = '---' ] && [ "$has_beginning" = 0 ]; then
      has_beginning=1
      continue
    fi
    if [ "$line" = '---' ] && [ "$has_beginning" = 1 ]; then
      has_ending=1
      break
    fi
    # check that line has title frontmatter param
    if [[ $line =~ ^title:.+$ ]]; then
      has_frontmatter_title=1
    fi
  done < "$filepath"


  if [ "$has_ending" = 0 ]; then
    echo "$filepath open_frontmatter_block Check the .md file, you have open frontmatter block (end it with '---')"
    HAS_ERROR=1
    return
  fi

  if [ "$has_frontmatter_title" = 0 ]; then
    echo "$filepath without_title Check the .md file, it should have frontmatter block with title param or markdown first level header"
    HAS_ERROR=1
  fi
}

IFS=$'\n'; set -f
for filepath in $(find "$1" -iname '*.md'); do
    check_file "$filepath"
done
unset IFS; set +f

exit $HAS_ERROR