success_with_args

bin/miaou-bash

@@ -581,33 +581,48 @@ function cleanup {
   rm -f "$MIAOU_BASH_ERROR"
 }
 
+function usage {
+  echo "$(basename "$0") <SCRIPT> [...SCRIPT_ARGS] | --version | --help"
+}
+
+function parse_options {
+  [[ $# == 0 ]] && >&2 echo 'ERROR: script expected!' && builtin exit 2
+  [[ $# == 1 ]] && case "$1" in
+  --help) usage && builtin exit ;;
+  --version) cat "$MIAOU_BASH_DIR/.semver_git_tag" && builtin exit ;;
+  -*) >&2 echo "ERROR: option '$1' unknown!" && usage && builtin exit 2 ;;
+  esac
+  [[ $1 =~ ^- ]] && >&2 echo "ERROR: too many args $#, either single option or SCRIPT + args accepted!" && builtin exit 2
+  SCRIPT="$1"
+  [[ ! -v SCRIPT ]] && >&2 echo 'ERROR: script expected!' && builtin exit 2
+  [[ ! -f "$SCRIPT" ]] && >&2 echo "ERROR: script '$SCRIPT' not found!" && builtin exit 2
+  true
+}
+
 ## main
 
-[[ $# -lt 1 ]] && >&2 echo 'ERROR: script expected!' && builtin exit 1
-
 set -euo pipefail
-set -E # HALT on subshell error
-set -T # DEBUG RETURN
+set -E # HALT on pipe error
+set -T # RETURN
+
+parse_options "$@"
 build_miaou_bash_error
-BASH_ARGV0="$1" && shift # to pretend script runs by itself
 trap 'on_error $?' ERR
 trap 'on_exit $?' EXIT
 trap 'on_pipe' PIPE
 trap 'on_return' RETURN
 
-if ! is_true "$CHILD_PROCESS"; then
-  # main
-  [[ -e /proc/$$/fd/3 ]] && exec 4>&3 3>&- || exec 4>/dev/tty # swap fd 3 4 when fd 3 sent off
-  exec 3>/dev/stderr 2>"$MIAOU_BASH_ERROR"
-else
-  # any children
-  exec 4>/dev/tty 2>"$MIAOU_BASH_ERROR"
-fi
-
+BASH_ARGV0="$SCRIPT" && shift
 if is_true "$CHILD_PROCESS"; then
+  # any nested children
+  exec 4>/dev/tty 2>"$MIAOU_BASH_ERROR"
   miaou_debug "<child file=$BASH_ARGV0 pid=${BASHPID} parent=${PPID}>"
 else
+  # the MAIN Process
+  [[ -e /proc/$$/fd/3 ]] && exec 4>&3 3>&- || exec 4>/dev/tty # swap fd 3 4 when fd 3 sent off
+  exec 3>/dev/stderr 2>"$MIAOU_BASH_ERROR"
   miaou_debug "<main file=$BASH_ARGV0 pid=${BASHPID}/>"
 fi
+
 # shellcheck source=/dev/null
-source "$BASH_ARGV0"
+source "$SCRIPT"