[Rakefile] Improve inch:spec task

Rakefile

@@ -303,9 +303,51 @@ begin
   namespace :inch do
     desc 'Lint the completeness of the documentation with Inch'
     task :spec do
-      sh "inch --all --no-undocumented list | tee tmp/inch.txt"
-      sh "grep -q 'Nothing to suggest.' tmp/inch.txt" do |ok, _|
-        fail red('✗ Improve above suggestions.') unless ok
+      require 'inch'
+      require 'inch/cli'
+
+      puts 'Parse docs …'
+      YARD::Parser::SourceParser.before_parse_file do |_|
+        print green('.') # Visualize progress
+      end
+
+      class ProgressEnumerable
+        include Enumerable
+
+        def initialize(array)
+          @array = array
+        end
+
+        def each
+          @array.each do |e|
+            print '.'
+            yield e
+          end
+        end
+      end
+
+      Inch::Codebase::Objects.class_eval do
+        alias_method :old_init, :initialize
+        def initialize(language, objects)
+          puts "\n\nEvaluating …"
+          old_init(language, ProgressEnumerable.new(objects))
+        end
+      end
+
+      codebase = Inch::Codebase.parse(Dir.pwd, Inch::Config.codebase)
+      context = Inch::API::List.new(codebase, {})
+      options = Inch::CLI::Command::Options::List.new
+      options.show_all = true
+      options.ui = Inch::Utils::UI.new
+      failing_grade_symbols = [:B, :C] # add :U for undocumented
+      failing_grade_list = context.grade_lists.select { |g| failing_grade_symbols.include?(g.to_sym) }
+      Inch::CLI::Command::Output::List.new(options, context.objects, failing_grade_list)
+      puts
+      if context.objects.any? { |o| failing_grade_symbols.include?(o.grade.to_sym) }
+        puts red('✗ Lint of Documentation failed: Please improve above suggestions.')
+        exit 1
+      else
+        puts green('✓ Nothing to improve detected.')
       end
     end
   end
@@ -348,6 +390,10 @@ def title(title)
   puts
 end
 
+def green(string)
+  "\033[0;32m#{string}\e[0m"
+end
+
 def red(string)
   "\033[0;31m#{string}\e[0m"
 end