added site_root into environmental variable

Author: Jin IGARASHI

.env.example

@@ -1,2 +1,3 @@
 REGION=africa
-AREA=rwanda
+AREA=rwanda
+SITE_ROOT=http://localhost:9966

README.md

@@ -18,6 +18,7 @@ rake inet:install # install extra software
 # specify OSM regison and area for tiles
 export REGION=africa 
 export AREA=rwanda
+export SITE_ROOT=http://localhost:9966 # you can skip if you don't need to change it.
 rake inet:download # donwload source geospatial data for exercise
 ```
 
@@ -63,6 +64,7 @@ docker run -v $(pwd):/usr/src/app -it unvt/naru
 cd /usr/src/app
 export REGION=africa 
 export AREA=rwanda
+export SITE_ROOT=http://localhost:9966
 rake inet:download # download osm.obf
 rake tiles # create mbtiles under src folder
 rake style # create style.json

Rakefile

@@ -1,6 +1,7 @@
 REGION = ENV['REGION']
 AREA = ENV['AREA']
 MBTILES = "src/tiles.mbtiles"
+SITE_ROOT = ENV['SITE_ROOT'] || 'http://localhost:9966'
 
 namespace :inet do
   desc 'install extra software for naru'
@@ -39,7 +40,7 @@ end
 desc 'build style.json from HOCON descriptions'
 task :style do
   require 'json'
-  sh "parse-hocon hocon/style.conf > docs/style.json"
+  sh "site_root=#{SITE_ROOT} parse-hocon hocon/style.conf > docs/style.json"
   center = JSON.parse(File.read('docs/zxy/metadata.json'))['center'].split(',')
     .map{|v| v.to_f }.slice(0, 2)
   style = JSON.parse(File.read('docs/style.json'))

hocon/_root.conf

@@ -1,7 +1,7 @@
 # _root.conf
 # project specific parameters
 #site_root: "https://optgeo.github.io/kokoromi-rw"
-site_root: "http://localhost:9966"
+# site_root: "http://localhost:9966"
 # center: [lng, lat]
 center: [
   174.786987