Add dspec task to test distributable script

.gitignore

@@ -9,3 +9,4 @@
 /tmp/
 /.rspec_status
 /spec/run/
+/dspec/

Rakefile

@@ -10,6 +10,18 @@ RSpec::Core::RakeTask.new(:spec, :example_pattern) do |task, args|
   end
 end
 
+# dspec task is useful to test the distributable release script, but is not
+# useful for coverage information.
+desc "Dist Specs"
+task :dspec, [:example_string] => :build_dist do |task, args|
+  FileUtils.rm_rf("dspec")
+  FileUtils.mkdir_p("dspec")
+  FileUtils.cp("dist/propane", "dspec/propane")
+  ENV["dist_specs"] = "1"
+  Rake::Task["spec"].execute(args)
+  ENV.delete("dist_specs")
+end
+
 task :default => :spec
 
 desc "Build user guide"

spec/propane_spec.rb

@@ -11,7 +11,12 @@ describe Propane do
 
   def build_parser(options = {})
     options[:name] ||= ""
-    command = %W[./propane.sh spec/run/testparser#{options[:name]}.propane spec/run/testparser#{options[:name]}.#{options[:language]} --log spec/run/testparser#{options[:name]}.log]
+    if ENV["dist_specs"]
+      propane = "dspec/propane"
+    else
+      propane = "./propane.sh"
+    end
+    command = %W[#{propane} spec/run/testparser#{options[:name]}.propane spec/run/testparser#{options[:name]}.#{options[:language]} --log spec/run/testparser#{options[:name]}.log]
     if (options[:capture])
       stdout, stderr, status = Open3.capture3(*command)
       Results.new(stdout, stderr, status)