#! /usr/bin/env python

"""ttroundtrip font1 ... fontN
Dump each TT/OT font as a TTX file, compile again to TTF or OTF and dump again.
Then do a diff on the two TTX files. Log problems and diffs to a file called
"report.txt" in the current directory. This is only for testing FontTools/TTX,
the resulting files are deleted afterwards."""


import sys
import os
import tempfile


report = open("report.txt", "w")


class Error(Exception): pass


def doCommand(cmd, verbose=1, okresult=None):
	print "--> ", cmd
	f = os.popen(cmd)
	lines = []
	for line in f:
		if verbose:
			sys.stdout.write(line)
		lines.append(line)
	result = os.wait()[1] >> 8
	if result and result <> okresult:
		raise Error, result
	return "".join(lines)


if not sys.argv[1:]:
	print __doc__
else:
	for ttFile in sys.argv[1:]:
		print "--- roundtripping %s ---" % ttFile
		fn = os.path.basename(ttFile)
		xmlFile1 = tempfile.mktemp(".%s.ttx1" % fn)
		ttFile2 = tempfile.mktemp(".%s" % fn)
		xmlFile2 = tempfile.mktemp(".%s.ttx2" % fn)
		
		try:
			cmd = 'ttdump -i -f "%s" "%s"' % (ttFile, xmlFile1)
			doCommand(cmd, 0)
			cmd = 'ttcompile -f "%s" "%s"' % (xmlFile1, ttFile2)
			doCommand(cmd, 0)
			cmd = 'ttdump -i -f "%s" "%s"' % (ttFile2, xmlFile2)
			doCommand(cmd, 0)
			cmd = 'diff -c2 -I ".*modified value\|checkSumAdjustment.*" "%s" "%s"' % (xmlFile1, xmlFile2)
			diff = doCommand(cmd, 0, okresult=1)
			if diff:
				report.write("=============================================================\n")
				report.write("%s\n" % xmlFile1)
				report.write("%s\n" % xmlFile2)
				report.write("-------------------------------------------------------------\n")
				report.write(diff)
				print diff
			print "--- done ---"
		except Error, why:
			report.write("=============================================================\n")
			report.write("%s\n" % ttFile)
			report.write("*** round tripping aborted (code %s) ***\n" % why)
			report.write("-------------------------------------------------------------\n")
			print "*** round tripping aborted (code %s) ***" % why
		for tmpFile in (xmlFile1, ttFile2, xmlFile2):
			if os.path.exists(tmpFile):
				os.remove(tmpFile)