[TxMt] Set temporary variables within macro

[Richard Blumberg]

I'm trying to build a complicated macro to add a footnote to text selected in
a document. There are two values that I need to maintain while the macro
runs, so that those values can be inserted into the proper places within the
links that the macro creates. The values are CURRENT_FN_NUMBER, a unique id
I create with the shell date command; and CURRENT_FN_TITLE, which is the
value of $TM_SELECTED_TEXT when the macro launches.

I'd like to us those values to insert code into the document, e.g.

At the beginning of the current paragraph:   

Replace selected text with:  #fn{$CURRENT_FN_NUMBER} $CURRENT_FN_TITLE 

At bottom of document, just before "<!--<next footnote -->": 
#{CURRENT_FN_NUMBER} $CURRENT_FN_TITLE 

There's more to it than that, but you get the idea. The macro does a lot of
jumping around within the document, setting and removing bookmarks as it
goes.

I've set CURRENT_FN_NUMBER and CURRENT_FN_TITLE as project environmental
variables, but I can't figure out how to set values for those variables when
the macro executes.

I'm (obviously) new at this game; I'd appreciate help.

Thanks.

Richard
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