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

@@ -6,11 +6,12 @@ const fs = require('fs')
 const path = require('path')
 
 // Define filepaths
+const indexJsFile = path.join(__dirname, '..', 'src', 'index.js')
 const leafletOptions = path.join(__dirname, '..', 'src', 'leaflet_options.js')
 const debug = path.join(__dirname, '..', 'debug', 'index.html')
 
 // Read & Replace options
-for (const filepath of [leafletOptions, debug]) {
+for (const filepath of [indexJsFile, leafletOptions, debug]) {
   let options = fs.readFileSync(filepath, 'utf8')
 
   // Define Environment variables
@@ -21,6 +22,7 @@ for (const filepath of [leafletOptions, debug]) {
   const LANGUAGE = process.env.OSRM_LANGUAGE || 'en'
   const DEFAULT_LAYER = process.env.OSRM_DEFAULT_LAYER || 'streets'
   const MAPBOX_TOKEN = process.env.OSRM_MAPBOX_TOKEN || 'pk.eyJ1IjoibXNsZWUiLCJhIjoiclpiTWV5SSJ9.P_h8r37vD8jpIH1A6i1VRg'
+  const NOMINATIM_ENDPOINT = process.env.NOMINATIM_ENDPOINT || 'https://nominatim.openstreetmap.org/'
 
   // Edit Leaflet Options
   if (BACKEND) options = options.replace(/http[s]?:\/\/router\.project-osrm\.org/, BACKEND)
@@ -42,6 +44,8 @@ for (const filepath of [leafletOptions, debug]) {
     else options = options.replace('38.8995,-77.0269', latlng)
   }
 
+  if (NOMINATIM_ENDPOINT) options = options.replace('https://nominatim.openstreetmap.org/', NOMINATIM_ENDPOINT)
+
   // Save Leaflet Options
   fs.writeFileSync(filepath, options)
 }

src/index.js

@@ -93,7 +93,7 @@ function makeIcon(i, n) {
   }
 }
 var plan = new ReversablePlan([], {
-  geocoder: L.Control.Geocoder.nominatim(),
+  geocoder: L.Control.Geocoder.nominatim({serviceUrl: 'https://nominatim.openstreetmap.org/'}),
   routeWhileDragging: true,
   createMarker: function(i, wp, n) {
     var options = {