#!/bin/sh
#
# Global wrapper function dispatching to the various sh-ves subcommands.
#
ves() {
    if [ -z "$SH_VES_INIT" ]; then
        printf "ERROR: sh-ves is not initialized. Source ves-init.sh first.\n" >&2
        return 1
    fi

    if [ "$#" -lt 1 ]; then
        printf "ERROR: Please specify a command.\n" >&2
        ves_help >&2
        return 1
    fi

    # extract the appropriate command
    case $1 in
        create)
            shift
            ves_create "$@"
            ;;
        delete)
            shift
            ves_delete "$@"
            ;;
        var-add)
            shift
            ves_var_add "$@"
            ;;
        var-rm)
            shift
            ves_var_rm "$@"
            ;;
        export)
            shift
            ves_export "$@"
            ;;
        unset)
            shift
            ves_unset "$@"
            ;;
        show)
            shift
            ves_show "$@"
            ;;
        copy)
            shift
            ves_copy "$@"
            ;;
        rename)
            shift
            ves_rename "$@"
            ;;
        run)
            shift
            ves_run "$@"
            ;;
        switch)
            shift
            ves_switch "$@"
            ;;
        list)
            shift
            ves_list "$@"
            ;;
        envs)
            shift
            ves_envs "$@"
            ;;
        activate)
            shift
            ves_activate "$@"
            ;;
        deactivate)
            shift
            ves_deactivate "$@"
            ;;
        prompt)
            shift
            "$SHVES_BIN"/ves-prompt.sh "$@"
            ;;
        help|--help|-h)
            ves_help
            ;;
        *)
            printf "ERROR: Invalid command [%s]\n" "$1" >&2
            ves_help >&2
            return 1
            ;;
    esac
}

ves_help() {
    cat <<'EOF'
usage: ves <command> [arguments]

commands:
  create [--override] <name>          create a new environment
  delete <name>                       delete an environment
  copy <src> <dst>                    copy an environment
  rename <old> <new>                  rename an environment
  activate <name>                     activate an environment
  deactivate                          deactivate the active environment
  switch <name>                       deactivate, then activate <name>
  run <name> <command...>             run a command inside an environment
  export [--env=<name>] <var> <val>   set a variable in an environment
  unset [--env=<name>] <var>          remove a variable from an environment
  show [<name>]                       show the variables of an environment
  var-add [--env=<name>] [--append] <var> <val>
                                      prepend (or append) an entry to a
                                      path-like variable
  var-rm [--env=<name>] <var> <val>   remove an entry from a path-like variable
  list [--index] <var>                list the entries of a path-like variable
  envs                                list all environments
  prompt [symbol]                     print a prompt fragment for PS1
  help                                show this message
EOF
}