Macro / Function to draw a set of characters below the line above

Hello, Vim Users,

I'm writing a fair amount of documentation in Asciidoc these days.
When entering a major section's title, a row of equal signs, tlides,
dashes, or carets equal to the length of the line of text above (or
within two or three of the exact length) must be entered so that the
line is recognized as a section title.


Example:


This is a section title, and the row of equal signs below it must be
of the same length as this text
====================================================================================================


I'm looking for a function to do this to reduce the tedium. Would
like to bind this new function to a key so it's quick to execute, say,
Ctrl-F1 or some such.

Ideas appreciated.

Keith

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