Open Rubocop Docs for Department/CopName from ZSH Shell

rubocop.zsh

# Open Rubocop documentation. Optionally, by <Department> or by <Department>/<Name>.
#
# Example:
#   `copd` -> Opens https://docs.rubocop.org/rubocop/index.html
#   `copd Naming` -> Opens https://docs.rubocop.org/rubocop/cops_naming.html
#   `copd Style/ArgumentsForwarding` -> Opens https://docs.rubocop.org/rubocop/cops_style.html#styleargumentsforwarding
function copd() {
  if [[ $# -eq 0 ]]; then
    open "https://docs.rubocop.org/rubocop/index.html"
  else
    local department="${1%%/*}"  # Extract the department before '/'
    local department_lowercase="${department:l}"  # Convert department URL to lowercase

    local url="https://docs.rubocop.org/rubocop/cops_${department_lowercase}.html"

    if [[ -n $1 && $1 != */* ]]; then
      open "$url"
    else
      local cop="${1#*/}"  # Remove everything before '/'
      local cop_lowercase="${cop:l}"  # Convert cop name to lowercase

      url="${url}#${department_lowercase}${cop_lowercase}"
      open "$url"
    fi
  fi
}