osm-diff.py

   1 #! /usr/bin/python
   2
   3 import optparse, urllib2, xml.dom.minidom
   4
   5 parser = optparse.OptionParser()
   6 parser.add_option("-n", "--node")
   7
   8 (options, args) = parser.parse_args()
   9
  10 url = "http://openstreetmap.com/api/0.5/node/%s/history" % options.node
  11
  12 data = urllib2.urlopen(url).read()
  13 history = xml.dom.minidom.parseString(data)
  14
  15 history = history.childNodes[0]
  16 assert history.nodeName == 'osm'
  17
  18 # FIXME make general
  19 changes = sorted(history.getElementsByTagName('node'), key=lambda x: x.attributes['timestamp'].value)
  20
  21 last_node = changes[0]
  22
  23 print "This node was created by %s on %s" % (last_node.attributes['user'].value, last_node.attributes['timestamp'].value)
  24
  25 for this_node in changes[1:]:
  26
  27     print "On %s user %s..." % (this_node.attributes['timestamp'].value, this_node.attributes['user'].value)
  28
  29     # change in location
  30     last_loc = (last_node.attributes['lat'].value, last_node.attributes['lon'].value)
  31     this_loc = (this_node.attributes['lat'].value, this_node.attributes['lon'].value)
  32     if last_loc != this_loc:
  33         print "\tchanged the location to %s (old location %s)" % (last_loc, this_loc)
  34
  35     last_tags = dict((x.attributes['k'].value, x.attributes['v'].value) for x in last_node.getElementsByTagName('tag'))
  36     this_tags = dict((x.attributes['k'].value, x.attributes['v'].value) for x in this_node.getElementsByTagName('tag'))
  37
  38     # look at tags that have been added
  39     for tag in sorted(this_tags):
  40         if tag not in last_tags:
  41             print "\tadded tag %s=%s" % (tag, this_tags[tag])
  42
  43     for tag in sorted(last_tags):
  44         if tag not in this_tags:
  45             print "\tdeleted tag %s=%s" % (tag, last_tags[tag])
  46         elif last_tags[tag] != this_tags[tag]:
  47             print "\tchanged tag %s from %s=%s to %s=%s" % (tag, tag,last_tags[tag], tag, this_tags[tag])
  48
  49
  50     last_node = this_node
  51
  52
  53
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  56