🚀 go-pugleaf

Yes, that's possible. First, we need some way of identifying the right 
frame. If you were starting from scratch, a label might make sense. We 
could also identify it by, say, item 3 of its geometric bounds, or 
where it sits, or even what layer it's on.

Let's assume, though, that it's the only -- or at least frontmost -- 
frame on each page to have its vertical alignment set to bottom 
alignment. Let's also assume that we want the rule 1 pt, and 14 of 
whatever vertical units you are using above the baseline of the first 
line of text. Something like this should do the job:

tell application "InDesign CS"
	tell document 1
		-- get doc details
		tell document preferences
			set pageCount to pages per document
			set pageWidth to page width
		end tell
		tell margin preferences
			set leftMargin to left
			set rightMargin to right
		end tell
		-- loop through pages
		repeat with i from 1 to pageCount
			-- get position of first character of the frame
			tell (text frame 1 of page i whose vertical justification of text 
frame preferences = bottom align)
				set theBase to baseline of character 1
			end tell
			-- make rule
			make graphic line at page i with properties {geometric 
bounds:{theBase - 14, leftMargin, theBase - 14, pageWidth - 
rightMargin}, stroke weight:1}
			
		end repeat
	end tell
end tell


--
Shane Stanley <sstanley@myriad-com.com.au>