From 8c3cba08f7da9b4dc1bfc54d5ba887b9d9bcf8eb Mon Sep 17 00:00:00 2001
From: Peter Teuben <teuben@gmail.com>
Date: Thu, 29 Jun 2023 23:45:09 -0400
Subject: [PATCH] add simple help

---
 animate1 | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/animate1 b/animate1
index fea3d72..232f5bd 100755
--- a/animate1
+++ b/animate1
@@ -7,10 +7,19 @@
 #> RADIO   xcol=x1v       i,x1v,rho,press,vel1,vel2,vel3  
 #> RADIO   ycol=vel1      i,x1v,rho,press,vel1,vel2,vel3  
 
-#             set defaults
-base=LinWave
-xcol=x1v
-ycol=vel1
+#--HELP
+#                 Animation of tables using NEMO's tabplot
+base=LinWave      # basename (including directories if needed)
+xcol=x1v          # X column name
+ycol=vel1         # Y column name
+#--HELP
+
+
+if [ "$1" == "--help" ] || [ "$1" == "-h" ]; then
+    set +x
+    awk 'BEGIN{s=0} {if ($1=="#--HELP") s=1-s;  else if(s) print $0; }' $0
+    exit 0
+fi
 
 #             simple keyword=value command line parser for bash
 for arg in "$@"; do