Make nominatim endpoint modifiable

Most of API endpoints can be modified via leaflet_options.js, which is
mentioned in README as a target of manual modify.

But nominatim endpoint cannot be modified by this way. As nominatim can
be self-hosted, I think it should be modifiable in configuration.

Author: nhirokinet

scripts/replace.js

@@ -12,6 +12,7 @@ function applyReplacements(content, env) {
   const BACKEND = env.OSRM_BACKEND || 'https://router.project-osrm.org'
   const LANGUAGE = env.OSRM_LANGUAGE || 'en'
   const DEFAULT_LAYER = env.OSRM_DEFAULT_LAYER || 'streets'
+  const NOMINATIM_ENDPOINT = env.NOMINATIM_ENDPOINT || 'https://nominatim.openstreetmap.org/'
 
   let options = content
 
@@ -34,6 +35,7 @@ function applyReplacements(content, env) {
     // Leaflet uses LatLng
     else options = options.replace('38.8995,-77.0269', latlng)
   }
+  if (NOMINATIM_ENDPOINT) options = options.replace('https://nominatim.openstreetmap.org/', NOMINATIM_ENDPOINT)
 
   return options
 }

src/geocoder.js

@@ -41,8 +41,8 @@ function parseCoords(query) {
 // For non-coordinate input, falls through to Nominatim forward-geocode as normal.
 // Also bridges leaflet-control-geocoder's Promise API to the callback-based API
 // that leaflet-routing-machine's autocomplete expects.
-geocoder.coordPreserving = function() {
-  var nominatim = L.Control.Geocoder.nominatim();
+geocoder.coordPreserving = function(nominatimUrl) {
+  var nominatim = L.Control.Geocoder.nominatim({serviceUrl: nominatimUrl});
 
   function withCallback(promise, cb, context) {
     return promise.then(function(results) {

src/index.js

@@ -99,7 +99,7 @@ function makeIcon(i, n) {
   }
 }
 var plan = new ReversablePlan([], {
-  geocoder: createGeocoder.coordPreserving(),
+  geocoder: createGeocoder.coordPreserving(leafletOptions.nominatim.path),
   routeWhileDragging: true,
   createMarker: function(i, wp, n) {
     var options = {

src/leaflet_options.js

@@ -65,5 +65,8 @@ module.exports = {
     three: satellite,
     four: osm,
     five: osm_de
+  },
+  nominatim: {
+    path: 'https://nominatim.openstreetmap.org/'
   }
 };