1 files changed, 77 insertions, 0 deletions
diff --git a/vobject/change_tz.py b/vobject/change_tz.py
new file mode 100644
index 0000000..1227676
--- /dev/null
+++ b/vobject/change_tz.py
@@ -0,0 +1,77 @@
+"""Translate an ics file's events to a different timezone."""
+
+from optparse import OptionParser
+import icalendar, base
+import sys
+try:
+    import PyICU
+except:
+    PyICU = None
+    
+from datetime import datetime
+
+def change_tz(cal, new_timezone, default, utc_only=False, utc_tz=icalendar.utc):
+    for vevent in getattr(cal, 'vevent_list', []):
+        start = getattr(vevent, 'dtstart', None)
+        end   = getattr(vevent, 'dtend',   None)
+        for node in (start, end):
+            if node:
+                dt = node.value
+                if (isinstance(dt, datetime) and
+                    (not utc_only or dt.tzinfo == utc_tz)):
+                    if dt.tzinfo is None:
+                        dt = dt.replace(tzinfo = default)
+                    node.value = dt.astimezone(new_timezone)
+
+def main():        
+    options, args = get_options()
+    if PyICU is None:
+        print "Failure. change_tz requires PyICU, exiting"
+    elif options.list:
+        for tz_string in PyICU.TimeZone.createEnumeration():
+            print tz_string
+    elif args:
+        utc_only = options.utc
+        print "Converting %s events" % "only UTC" if utc_only else "all"
+        ics_file = args[0]
+        timezone = PyICU.ICUtzinfo.getInstance(args[1]) if len(args) > 1 else PyICU.ICUtzinfo.default
+        print "... Reading %s" % ics_file
+        cal = base.readOne(file(ics_file))
+        change_tz(cal, timezone, PyICU.ICUtzinfo.default, utc_only)
+        
+        out_name = ics_file + '.converted'
+        print "... Writing %s" % out_name
+        out = file(out_name, 'wb')
+        cal.serialize(out)
+        print "Done"
+
+
+version = "0.1"
+
+def get_options():
+    ##### Configuration options #####
+
+    usage = """usage: %prog [options] ics_file [timezone]"""
+    parser = OptionParser(usage=usage, version=version)
+    parser.set_description("change_tz will convert the timezones in an ics file. ")
+
+    parser.add_option("-u", "--only-utc", dest="utc", action="store_true",
+                      default=False, help="Only change UTC events.")
+    parser.add_option("-l", "--list", dest="list", action="store_true",
+                      default=False, help="List available timezones")
+
+
+    (cmdline_options, args) = parser.parse_args()
+    if not args and not cmdline_options.list:
+        print "error: too few arguments given"
+        print
+        print parser.format_help()
+        return False, False
+
+    return cmdline_options, args
+
+if __name__ == "__main__":
+    try:
+        main()
+    except KeyboardInterrupt:
+        print "Aborted"