#!/bin/sh
sed '
0,/^> /d
: quote
s#\(@[^|]*||[^@]*\)\([^\\]\)|#\1\2\\|#g
t quote
s#@\([^|]*\)||\([^@]*@\)#@\1|run://\2#g
: again
s/\([|@]run:\/\/[^ @]*\) /\1
/g
s/\([|@]run:\/\/[^ @]*\)	/\1/g
t again
'