mkdir but takes a -c/--cd argument that cd's into the new directory

mkdir-custom.bash

# I got tired of this pattern: mkdir -p path/to/dir && cd path/to/dir
# So now mkdir will take a -c or --cd argument to do it all at once.

mkdir-custom () {
  local do_cd=false;
  local mkdir_args=();
  local target_dir="";
  function show_help ()
  {
    cat <<-'EOF'
Usage: mkdir-custom [OPTIONS] DIRECTORY

Create a directory with optional automatic cd.

Options:
 -c, --cd      After creating directory, change into it
 -p         Create parent directories as needed (passed to mkdir)
 -m MODE      Set file mode (passed to mkdir)
 -v, --verbose   Print a message for each created directory (passed to mkdir)
 -h, --help     Display this help message
 --test       Run associated tests

All other options are forwarded to the system mkdir command.

Examples:
 mkdir-custom mydir      # Create mydir
 mkdir-custom -c mydir    # Create mydir and cd into it
 mkdir-custom -c -p a/b/c   # Create nested dirs and cd to a/b/c

Note: The -c/--cd option only affects the current shell when used
through the 'mkdir' alias. Use 'alias mkdir=mkdir-custom' in your
shell configuration.
EOF

  };
  if [[ "$1" == "--test" ]]; then
    if [[ -x "$HOME/dotfiles/bin/test/mkdir-custom_test" ]]; then
      "$HOME/dotfiles/bin/test/mkdir-custom_test" > /dev/null;
      return $?;
    else
      echo "Error: Test file not found or not executable" 1>&2;
      return 1;
    fi;
  fi;
  while [[ $# -gt 0 ]]; do
    case "$1" in
      -h | --help)
        show_help;
        return 0
      ;;
      -c | --cd)
        do_cd=true;
        shift
      ;;
      -*)
        mkdir_args+=("$1");
        shift
      ;;
      *)
        target_dir="$1";
        shift
      ;;
    esac;
  done;
  if [[ -z "$target_dir" ]]; then
    echo "Error: No directory specified" 1>&2;
    show_help 1>&2;
    return 1;
  fi;
  if ! command mkdir "${mkdir_args[@]}" "$target_dir"; then
    return $?;
  fi;
  if [[ "$do_cd" == true ]]; then
    cd "$target_dir" || return $?;
  fi;
  return 0
}

alias mkdir='mkdir-custom'