gistfile1.txt

#!/usr/bin/python

import fileinput, re, sys

current_file = None
current_exports = []

def fixup(m):
    global current_exports
    if m.group(2) in current_exports:
        return "pub " + m.group(1) + " " + m.group(2)
    else:
        return m.group(0)

for line in fileinput.input(inplace=1, backup=".bak"):
    if current_file != fileinput.filename():
        current_file = fileinput.filename()
        current_exports = []

    m = re.search('^ *export (.*);', line)
    if m:
        current_exports += re.split(' *, *', m.group(1))
    else:
        sys.stdout.write(re.sub('((?:pure *|unsafe *)?fn|type|enum|mod|trait|const) *(\w+)', fixup, line))