#!/usr/bin/python
# Check fold markers for inconsistency.

import sys

fold = "{{{"
unfold = "}}}"

def check_file(fn):
	stack = []
	n = 0

	f = open(fn)
	for l in f.xreadlines():
		l = l.rstrip()
		n += 1

		p = l.find(fold)
		if p != -1:
			stack.append((n, p, l))

		p = l.find(unfold)
		if p != -1:
			if stack == []:
				print "%s:%d: too many unfolds" % (fn, n)
			(sn, sp, sl) = stack.pop()
			if sp != p:
				print "%s:%d: unfold indentation does not match fold at line %d" % (fn, n, sn)
				print "%5d> %s" % (sn, sl)
				print "%5d> %s" % (n, l)
	f.close()

	if stack != []:
		print "%s: folds unclosed at end of file" % fn
		for (sn, sp, sl) in stack:
			print "%5d> %s" % (sn, sl)

if __name__ == "__main__":
	for arg in sys.argv[1:]:
		check_file(arg)