building at lat lng

buildingAt.js

#!/usr/bin/env node

// npm install bluebird request xml-parser lodash
// usage: node buildingAt.js 43.699100505623726 7.264087200164794


var Promise = require('bluebird');
var request = Promise.promisify(require('request'));
var parse = require('xml-parser');
var _ = require('lodash');

var isBuildingNode = function (node) {
  return _.any(node.children, function (t) {
    return t.name == 'tag' && t.attributes['k'] == 'building' && t.attributes['v'] == 'yes';
  });
};

var nodeToObj = function (n) {
  var props = _(n.children)
    .filter(function (t) { return t.name == 'tag'; })
    .map(function (t) { return [t.attributes['k'], t.attributes['v']]; })
    .object()
    .value();
  return _.extend({}, n.attributes, props);
};

var getBuildingsAt = function (lat, lng) {
  return request({
    url: 'http://overpass.osm.rambler.ru/cgi/interpreter',
    qs: {
        data: '<coord-query lat="'+ lat +'" lon="'+ lng +'"/><print mode="body"/>'
    }
  }).spread(function (response, body) {
    var data = parse(body);
    var buildingNodes = _(data.root.children)
      .filter(isBuildingNode)
      .map(nodeToObj)
      .value();
    return buildingNodes
  })
};

getBuildingsAt(process.argv[2], process.argv[3])
  .then(function (buildings) {
    console.log(buildings);
  });