Prompt with options to "Reply" or "Reply All" when replying to a message with multiple recipients in Apple Mail for Mac OS X. Also does away with top-posting.

Reply.scpt

tell application "Mail"
	set _sel to get selection
	
	if (count of _sel) > 1 then
		-- multiple message selection, usually a conversation thread
		choose from list {"Reply", "Reply All"} with prompt "Unknown recipient count." default items {"Reply"}
		try
			set _menu_command to item 1 of the result
		on error
			return
		end try
		
	else
		
		set _msg to item 1 of _sel
		set _count to count recipients of _msg
		if (_count > 1) then
			choose from list {"Reply", "Reply All"} with prompt (_count as string) & " recipients:" as string default items {"Reply"}
			try
				set _menu_command to item 1 of the result
			on error
				return
			end try
		else
			set _menu_command to "Reply" -- Default for messages with single recipient
		end if
	end if
	
end tell

tell application "System Events"
	tell process "Mail"
		delay 0.5
		tell menu bar 1
			click menu bar item "Message"'s menu "Message"'s ¬
				menu item _menu_command
		end tell
		
		-- Delete or comment out the `delay` and `key code` lines below if
		-- you prefer Mail's default top-posting behavior.
		delay 0.25
		key code 117 -- Forward Delete to nuke top blank line
		
		
		-- Fix trailing whitespace
		key code 125 using command down -- move to bottom
		key code 123 using option down -- Option-LeftArrow
		key code 124 using command down -- Cmd-RightArrow
		key code 117 using option down -- Option-ForwardDelete
		key code 36 -- Return
		key code 36
	end tell
end tell

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