Write output, ready for primetime

diff --git a/icalparse.py b/icalparse.py
index cc548a3..3057560 100755 (executable)
--- a/icalparse.py
+++ b/icalparse.py
@@ -202,6 +202,29 @@ def applyRules(ical, rules=[], verbose=False):
        return ical
 
 
+def writeOutput(cal, outfile=''):
+       '''Takes a list of lines and outputs to the specified file'''
+
+       if not cal:
+               sys.stderr.write('Refusing to write out an empty file')
+               sys.exit(0)
+
+       if not outfile:
+               out = sys.stdout
+       else:
+               try:
+                       out = open(outfile, 'w')
+               except (IOError, OSError), e:
+                       sys.stderr.write('%s\n'%e)
+                       sys.exit(1)
+
+       if cal[-1]: cal.append('')
+
+       out.write('\r\n'.join(cal))
+
+       if not out == sys.stdout:
+               out.close()
+
 
 if __name__ == '__main__':
        from optparse import OptionParser
@@ -228,4 +251,4 @@ if __name__ == '__main__':
        cal = lineJoiner(content)
        ical = applyRules(splitFields(cal), generateRules())
        output = lineFolder(joinFields(ical))
-       print output
+       writeOutput(output, options.outfile)