Update build script to set default home page.

* BaseUrl has a different outSuffix for each version. So, use a different
  parameter for the home page.
* Use .Site.Params.home in version selector.

Author: danielmai

scripts/build.py

@@ -18,14 +18,17 @@ def exec(*argv):
         raise Exception('Failed to exec ' + " ".join(argv))
     return res
 
-
-def runHugo(outSuffix=""):
+def getBaseUrl(outSuffix=""):
     baseUrl = "https://tour.dgraph.io/"
     if BASE_URL_ENV in os.environ:
         baseUrl = os.environ[BASE_URL_ENV]
         if baseUrl[-1] != '/':
             baseUrl += '/'
     baseUrl += outSuffix
+    return baseUrl
+
+def runHugo(outSuffix=""):
+    baseUrl = getBaseUrl(outSuffix)
 
     destination = 'public/'
     if DEST_ENV in os.environ:
@@ -74,13 +77,13 @@ def buildBranch(branch, dest, jsonData):
 def buildAll(releases):
     latestRelease = releases[1]
     print('Latest Release (recommended to users): ', latestRelease)
-
     def jsonFor(version, latestRelease, releases):
         return {
             "params": {
                 "latestRelease": latestRelease,
                 "tourReleases": releases,
                 "thisRelease": version,
+                "home": getBaseUrl()
             },
         }
 

themes/hugo-tutorials/layouts/partials/topbar.html

@@ -29,7 +29,7 @@
   window.DgTour = {
     thisRelease: "{{ $.Site.Params.thisRelease }}",
     latestRelease: "{{ $.Site.Params.latestRelease }}",
-    baseUrl: "{{ $.Site.BaseURL }}"
+    home: "{{ $.Site.Params.home }}"
   }
 </script>
 

themes/hugo-tutorials/static/js/build/dgraph-tour.js

@@ -6,13 +6,13 @@ $('#tour-release').change(function(e) {
     return
   }
   if (dest == DgTour.latestRelease) {
-    window.location.href = DgTour.baseUrl;
+    window.location.href = DgTour.home;
     return
   }
   if (dest != "master") {
     dest = "dgraph-" + dest
   }
-  window.location.href = DgTour.baseURL + dest
+  window.location.href = DgTour.home + dest;
 });