Twig function osmDateParse()

doc/TwigJS.md

@@ -26,6 +26,7 @@ There are several extra functions defined for the TwigJS language:
 Extra filters:
 * filter websiteUrl: return a valid http link. Example: `{{ "www.google.com"|websiteUrl }}` -> "http://www.google.com"; `{{ "https://google.com"|websiteUrl }}` -> "https://google.com"
 * filter `matches`: regular expression match. e.g. `{{ "test"|matches("e(st)$") }}` returns `[ "est", "st" ]`. Returns null if it does not match.
+* filter `osmDateParse`: returns an array with the lower and upper boundary of the year of a `start_date` tag. See [https://github.com/plepe/openstreetmap-date-parser](openstreetmap-date-parser) for details.
 
 Notes:
 * Variables will automatically be HTML escaped, if not the filter raw is used, e.g.: {{ tags.name|raw }}

package.json

@@ -22,6 +22,7 @@
     "moment": "^2.18.1",
     "opening_hours": "^3.5.0",
     "openstreetbrowser-categories-main": "https://github.com/plepe/openstreetbrowser-categories-main",
+    "openstreetmap-date-parser": "^0.1.0",
     "openstreetmap-tag-translations": "https://github.com/plepe/openstreetmap-tag-translations",
     "overpass-layer": "https://github.com/plepe/overpass-layer",
     "query-string": "^5.0.0",

src/twigFunctions.js

@@ -1,6 +1,7 @@
 var OverpassLayer = require('overpass-layer')
 var OpeningHours = require('opening_hours')
 var colorInterpolate = require('color-interpolate')
+var osmParseDate = require('openstreetmap-date-parser')
 
 OverpassLayer.twig.extendFunction('tagsPrefix', function (tags, prefix) {
   var ret = {}
@@ -44,6 +45,9 @@ OverpassLayer.twig.extendFunction('colorInterpolate', function (map, value) {
   var colormap = colorInterpolate(map)
   return colormap(value)
 })
+OverpassLayer.twig.extendFilter('osmParseDate', function (value) {
+  return osmParseDate(value)
+})
 OverpassLayer.twig.extendFunction('evaluate', function (tags) {
   var ob = {
     id: 'x0',