Add a more detailed test coverage report

Author: kpaulisse

script/cibuild

@@ -105,8 +105,7 @@ if [ "$RSPEC_TEST" = "true" ]; then
     if [ "$exitcode" -ne 0 ]; then RSPEC_EXITCODE="$exitcode"; fi
 
     # Quick coverage report
-    cat "$DIR/coverage/coverage.json" \
-      | jq -r '.files[] | select(.covered_percent < 100) | (.covered_percent|tostring) + ": " + .filename'
+    "$DIR/script/display-coverage-report" "$DIR/coverage/coverage.json"
     echo ""
 
     # To avoid travis getting hung if it gets confused, we'll run each of these

script/display-coverage-report

@@ -0,0 +1,51 @@
+#!/usr/bin/env ruby
+
+# Quick hacky script to parse the coverage JSON report and display it in human-readable terms.
+# Usage: display-coverage-report <JSON_FILE>
+
+require 'json'
+require 'pathname'
+
+# Arg handling and validation
+json_file = ARGV.first
+unless json_file
+  raise "Usage: #{__FILE__} <json_coverage_file>"
+end
+
+unless File.file?(json_file)
+  raise "Error: Provided file #{json_file} does not exist"
+end
+
+# Find files with < 100% coverage
+result = {}
+data = JSON.parse(File.read(json_file))
+data['files'].each do |data|
+  next if data['covered_percent'] == 100
+
+  result[data['filename']] = { covered: data['covered_percent'], lines: [] }
+  data['coverage'].each_with_index do |cov, index|
+    next if cov.nil?
+    result[data['filename']][:lines] << (index + 1) if cov == 0
+  end
+end
+
+# Display results
+if result.empty?
+  puts "100% Coverage - You're all set, friend! :sparkles:"
+  exit 0
+end
+
+puts ""
+puts "-------------------------------------------------------------"
+puts "Test coverage report"
+puts "-------------------------------------------------------------"
+
+basedir = Pathname.new(File.expand_path('..', File.dirname(__FILE__)))
+result.keys.sort.each do |filename|
+  data = result[filename]
+  relative_path = Pathname.new(filename).relative_path_from(basedir).to_s
+  printf "* %s: %0.02f%% (missed: %s)", relative_path, data[:covered], data[:lines].join(",")
+end
+
+puts ""
+exit 1