Re: Adding fields conditionally to formail call?

When I suggested this,

| |          field1      
| |          :0
| |          * flag1 ?? yes
| |          { field1 = "-A 'X-header1: value'" }
| | 
| |          :0fh
| |          | formail -A "X-my: required" $field1 

Jari Aalto reported,

| David, I can't get this work with 3.11p7 The following simple tests says:
| 
|      field = "-A 'X-header1: value'"
| 
|      :0 fh
|      | formail -rt $field
| 
|     procmail: Assigning "field=-A 'X-header1: value'"
|     procmail: Executing "formail,-rt,-A,'X-header1:,value'"

and Philip Guenther warned me that that would happen.  I think my last guess
was something like this:

      field1 field2
      :0
      * flag1 ?? yes
      { field1 = "-AX-Header1:\ value" }

      :0
      * flag2 ?? yes
      { field2 = "-AX-Header2:\ value" }

      :0fh
      | formail -A "X-always: this" $field1 $field2

but the surer thing, as Philip and I agreed, was more like this:

      field1 field2
      :0
      * flag1 ?? yes
      { field1 = "-AX-Header1: value" } # no backslash

      :0
      * flag2 ?? yes
      { field2 = "-AX-Header2: value" }

      :0fh
      | formail -A "X-always: this" ${field1+"$field1"} ${field2+"$field2"}

The major breakthrough came when Philip suggested putting "-A" next to
"X-Headerwhichever:" so that we wouldn't have two different kinds of spaces
in the definitions of field1 and field2.