🐛 mkifdiff -h prints help and exits sucessfully

mkifdiff

@@ -8,10 +8,10 @@ set -euo pipefail
 #  20230718WF  add NOEMPTY (-n or --noempty)
 
 # need a file and needs to be in a pipe
-tty >/dev/null  && echo "need to pipe to $0; cmd | $0 output.txt" && exit 1
 usage(){ echo "USAGE: cmd | $0 [-n|--noempty] output.txt"; }
 [ $# -eq 0 -o $# -gt 2 ] && usage >&2 && exit 1
 [ "$1" == "-h" ] && usage && exit 0
+tty >/dev/null  && echo "need to pipe to $0; cmd | $0 output.txt" && exit 1
 
 # might want to avoid overwritting with an empty file
 NOEMPTY=

t/mkifdiff.bats

@@ -13,6 +13,12 @@ teardown(){
  return 0
 }
 
+mkifdiff_help() { #@test
+  run mkifdiff -h
+  [ $status -eq 0 ]
+  [[ "$output" =~ USAGE ]]
+}
+
 batmsg(){ echo "$*"|sed 's/: /:\t/' >&2; }
 modtime_unchanged() {
   mod_date="$(stat -c"%.10y" $MKIFDIFFFILE)"