Usage: (ag-fprintf ag-diversion format [ format-arg ... ])
Format a string using arguments from the alist.
Write to a specified AutoGen diversion.
That may be either a specified suspended output stream
(see out-suspend - suspend current output file) or an index into the output stack
(see out-push-new - purge and create output file). (ag-fprintf 0 ...) is
equivalent to (emit (sprintf ...)), and
(ag-fprintf 1 ...) sends output to the most recently
suspended output stream.
Arguments:
ag-diversion - AutoGen diversion name or number
format - formatting string
format-arg - Optional - list of arguments to formatting string