install

#!/usr/bin/env zsh

extension_args=()

while (( $# ))
do
  case "$1" in
    (--trace|trace)
      extension_args+=("--trace=all")
      shift
      ;;
    (--verbose=*)
      extension_args+=("--verbose")
      shift
      ;;
    (--prefix=*)
      prefix_path="${1/*\=}"
      shift
      ;;
    (--zsh|--shell)
      export sm_shell="$2"
      shift 2
      ;;
    (--prefix|prefix)
      prefix_path="$2"
      if ! shift 2
      then
        echo "ERROR: A prefix path must be followed by keyword 'prefix'."
        exit 1
      fi
      ;;
    (DESTROOT=)
      DESTROOT="${1/*\=}"
      shift
      ;;
    (DESTROOT)
      DESTROOT="$2"
      if ! shift 2
      then
        echo "ERROR: A DESTROOT path must be followed by keyword 'DESTROOT'."
        exit 1
      fi
      ;;
    (*)
      extension_args+=("$1")
      shift
      ;;
  esac
done

if [[ -z "${sm_shell:-}" ]] && ! command -v zsh >/dev/null
then
  echo "ERROR: ZSH is required for SM."
  exit 1
fi

if [[ -n "${prefix_path}" ]]
then
  sm_path="${DESTROOT:-}${prefix_path}/sm"

elif [[ -z "${sm_path:-}" ]]
then
  if (( UID ))
  then
    sm_path="${DESTROOT:-/}${HOME#/}/.sm"
  else
    sm_path="${DESTROOT:-/}opt/sm"
  fi
fi

# set BDSM basic paths
export sm_path install_path archives_path scm_path src_path sets_user_path DESTROOT
install_path="${sm_path}" # Path to install everything to.
archives_path="${sm_path}/archives"
scm_path="${sm_path}/scm"
src_path="${sm_path}/src"
sets_user_path="${sm_path}/sets"
exts_user_path="${sm_path}/exts"

if [[ -n "${sm_shell:-}" ]]
then
  exec "${sm_shell}" "${PWD}/local" --call=install/install_sm "${extension_args[@]}"
else
  exec               "${PWD}/local" --call=install/install_sm "${extension_args[@]}"
fi