#! /usr/bin/ruby
# given input of the form generated by mailidx-positions,
# put an mbox of the messages on stdout
#
# use with formail like this:
#
#   mailidx-positions > /tmp/pos
#
# ... then, later when you need to find something ...
# 
#   : > /tmp/msgs
#   grep -i '@noserose\.' /tmp/pos | egrep -v '(\.nov|~)$' | sort | uniq | mailidx-mbox | formail -D 10000000 /tmp/msgs -s > /tmp/noserose
# 

STDIN.each { |s|
  (addr, pos, f) = s.split()
  pos = pos.to_i
  fd = File.open(f)
  fd.seek(pos)
  n = pos
  fd.each { |s|
    break if n != pos && s =~ /^From\s+/
    puts s
    n += s.length
  }
  fd.close
}