Use pretty.sh's new -w argument

src/imapdomo.skel

 
 
 usage() {
-    mkusage "[options] ACTION" \
+    mkusage "$@" "[options] ACTION" \
         -o                                                                    \
             "-c DIR      change to DIR before doing anything"                 \
             "-d          turn on debugging mode"                              \
     Debug=false
     #shellcheck disable=SC2034
     while true; do case $1 in
-        -c) CdTo="$2"; shift 2 || usage ;;
+        -c) CdTo="$2"; shift 2 || usage -w "missing value to: $1" ;;
         -d) Debug=true; PRETTY_DEBUG=true; shift ;;
         -V|--version-semver) show_semversion ;;
         --version) show_version ;;
-        -*) usage ;;
+        -*) usage -w "unknown argument: '$1'" ;;
         *)  break ;;
     esac done
     Action="$1"; shift
-    grep -qw "$Action" <<< "newmail|rewind|cleanup|migrate" || usage
+    grep -qw "$Action" <<< "newmail|rewind|cleanup|migrate" \
+     || usage -w "invalid action: $Action"
     cmd=$(mkcmd)
     debug -v cmd
     bash -n <<<"$cmd" || die