osm-blame.py

#!/usr/bin/env python3

import xml.etree.ElementTree as ET
import urllib.request
from tabulate import tabulate
from optparse import OptionParser

parser = OptionParser()

parser.add_option("-a", "--attribs", action="store", dest="attributes", default="user,version")
parser.add_option("-d", "--hide-deleted", action="store_false", dest="show_deleted", default=True)
parser.add_option("-c", "--changeset-tags", action="store", dest="changeset_tags", default=None)

(options, args) = parser.parse_args()

show_attrib = options.attributes.split(',')
show_changeset_tag = [] if options.changeset_tags is None else options.changeset_tags.split(',')
changeset_cache = {}

def get_changeset_tag(changeset, find_tag):
        if (not changeset_cache.get(changeset)):
            crequest = "https://www.openstreetmap.org/api/0.6/changeset/{}".format(changeset)
            cresponse = urllib.request.urlopen(crequest)
            changeset_cache[changeset] = cresponse.read()

        changeset_root = ET.fromstring(changeset_cache[changeset])

        for cversion in changeset_root:
            for tag in cversion.findall('tag'):
                if tag.get('k') == find_tag:
                    return tag.get('v')
        return None

item = args[0]

request = "https://www.openstreetmap.org/api/0.6/{}/history".format(item)
response = urllib.request.urlopen(request)
history_xml = response.read()

history_root = ET.fromstring(history_xml)

blame_tag = {}


for version in sorted(history_root, key=lambda x: int(x.get('version'))):

    attrib = dict(version.attrib)

    for tag in version.findall('tag'):
        tag_key = tag.get('k')
        tag_val = tag.get('v')
        if (
                tag_key not in blame_tag or
                tag_val != blame_tag[tag_key]['value']
            ):
            blame_tag[tag_key] = {'value': tag_val, 'attrib': attrib}

    for key in blame_tag.keys():
        if (
                version.find("./tag[@k='{}']".format(key)) is None and 
                blame_tag[tag_key]['value'] is not None
            ):
            blame_tag[key] = {'value': None, 'attrib': attrib}

final = []
for key, tag in blame_tag.items():
    if options.show_deleted:
        line = ['+' if tag['value'] else '-']
    else:
        if tag['value'] is None:
            continue
        line = []

    line += [key, tag['value']] + [tag['attrib'][attrib_name] for attrib_name in show_attrib] + \
            [get_changeset_tag(tag['attrib']['changeset'], c_tag_name) for c_tag_name in show_changeset_tag]

    final.append(line)

if options.show_deleted:
    headers = ['']
else:
    headers = []

headers += ['key', 'value'] + show_attrib + show_changeset_tag

print(tabulate(final, headers=headers))