coverage task tweaks

lib/tasks/coverage.rake

@@ -1,10 +1,8 @@
-COVERAGE_FILE_PATH = [
-  ENV.fetch("CIRCLE_WORKING_DIRECTORY", "./coverage_fe"),
-  "index.html"
-].join("/")
+COVERAGE_FILE_PATH = "./coverage_fe/index.html"
 THRESHOLD      = 0.001
 REPO_URL       = "https://api.github.com/repos/Farmbot/Farmbot-Web-App/git"\
                  "/refs/heads/staging"
+CURRENT_COMMIT = ENV.fetch("CIRCLE_SHA1", "")
 CSS_SELECTOR   = ".fraction"
 FRACTION_DELIM = "/"
 
@@ -22,23 +20,29 @@ namespace :coverage do
       .map { |x| x.split(FRACTION_DELIM).map(&:to_f) }
       .map { |x| Pair.new(*x) }
 
-    numerator     = lines.head + branches.head
-    denominator   = lines.tail + branches.tail
-    build_percent = (numerator / denominator) * 100
+    covered       = lines.head + branches.head
+    total         = lines.tail + branches.tail
+    build_percent = (covered / total) * 100
 
     latest_commit_staging = open_json(REPO_URL).dig("object", "sha")
     build_url             = "https://coveralls.io/builds/#{latest_commit_staging}.json"
-    staging_percent       = open_json(build_url).fetch("covered_percent")
+    begin
+      staging_percent     = open_json(build_url).fetch("covered_percent")
+    rescue OpenURI::HTTPError => exception
+      puts exception.message
+      puts "Error getting coveralls data. Wait for build to finish and try again."
+      staging_percent     = 100
+    end
 
     diff = (build_percent - staging_percent)
     pass = (diff > -THRESHOLD)
 
     puts "=" * 37
     puts "COVERAGE RESULTS"
-    puts "This build:    #{build_percent}"
-    puts "Staging build: #{staging_percent}"
+    puts "This build:    #{build_percent.round(8)} #{CURRENT_COMMIT[0,7]}"
+    puts "Staging build: #{staging_percent.round(8)} #{latest_commit_staging[0,7]}"
     puts "=" * 37
-    puts "Difference:    #{diff}"
+    puts "Difference:    #{diff.round(8)}"
     puts "Pass?:         #{pass ? "yes" : "no"}"
 
     exit pass ? 0 : 1