added possibility to document template parameters

template.sh

@@ -3,8 +3,9 @@
 while test $# -gt 0; do
     case "$1" in
         (-h|--help) if test -e "${!#}"; then
+                        sed -n 's,^ *# \( *[^-]\),\1,p' "${!#}"
                         cat <<EOF
-$0 $(sed -n 's,^ *# *,,p' "${!#}" | tr '\n' ' ') ${!#}
+$0 $(sed -n 's,^ *# \+-,-,p' "${!#}" | tr '\n' ' ') ${!#}
 EOF
                     else
                         cat <<EOF
@@ -26,8 +27,19 @@ FILE
   and execute bash commands, e.g. you are allowed wo use the \$()
   expression.
 
-  Document the parameters that shall be used in comment lines, this
-  are lines thet start with # followed by -v or -p options.
+  Document the template and the parameters that in comment
+  lines. Comment lines that start with a hash and a space ("# "). If
+  a dash ("-") follows, then this line documents a parameter.
+
+  Example:
+
+    # this is an arbitrary documentation line that is copied
+    # these are the parameters:
+    # 
+    #  -v VAR1=
+    #  -v VAR2=
+    #  -p PWD1
+    #  -p PWD2
 
 DESCRIPTION
 
@@ -39,9 +51,10 @@ EXAMPLE
 
   file wordpress.tpl
 -----------------------------------------------------------------------------
-# -v NAME=
-# -v PORT=
-# -p PASSWORD
+# this templeate starts a wordpress given an name and a port
+#  -v NAME=
+#  -v PORT=
+#  -p PASSWORD
 version: '3.3'
 services:
   mysql: