require 'spec_helper'

describe Scaffolder::Tool::Help do

  it "should inherit from Scaffolder::Tool" do
    described_class.superclass.should == Scaffolder::Tool
  end

  it "should return the description of the tool" do
    desc = "Help information for scaffolder commands"
    described_class.description.should == desc
  end

  USAGE = <<-MSG.gsub(/^ {6}/, '')
      usage: scaffolder [--version] COMMAND scaffold-file sequence-file
      [options]

      Commands:
    MSG

  describe "execution with" do

    before(:each) do
      @settings = Hash.new
      @settings.stubs(:rest).returns([])
    end

    describe "unknown command" do

      subject do
        @settings[:unknown_tool] = 'anything'
        described_class.new(@settings)
      end

      it "should raise an error" do
        lambda{ subject.execute }.should(raise_error(ArgumentError,
          "Unknown command 'anything'.\nSee 'scaffolder help'."))
      end

    end

    describe "no arguments" do

      subject do
        @settings[:empty_args] = true
        described_class.new(@settings)
      end

      it "should not raise an error" do
        lambda{ subject.execute }.should_not raise_error
      end

      it "should contain the usage information" do
        subject.execute.should include(USAGE)
      end

      it "should contain each tool information" do
        tool_subclasses.each do |cls|
          subject.execute.should include(cls.description)
        end
      end

    end

    describe "version argument" do

      subject do
        @settings[:version] = true
        @settings[:empty_args] = true
        described_class.new(@settings)
      end

      it "should not raise an error" do
        lambda{ subject.execute }.should_not raise_error
      end

      it "should return the version number" do
        version = File.read('VERSION').strip
        subject.execute.should == "scaffolder tool version " + version
      end

    end

    describe "existing man page" do

      before(:each) do
        @tool = Class.new(Scaffolder::Tool)
        described_class.superclass.const_set('Fake',@tool)

        @man_dir = File.join(%W|#{File.dirname(__FILE__)} .. .. .. man| )
        @fake_man = File.join(@man_dir,'scaffolder-fake.1.ronn')
      end

      after(:each) do
        described_class.superclass.send(:remove_const,'Fake')
      end

      subject do
        @settings.stubs(:rest).returns(['fake'])
        described_class.new(@settings)
      end

      it "should not raise an error" do
        Kernel.stubs(:system).with("ronn -m #{File.expand_path(@fake_man)}")
        lambda{ subject.execute }.should_not raise_error
      end

      it "should call ronn on the command line with the man file location" do
        Kernel.expects(:system).with("ronn -m #{File.expand_path(@fake_man)}")
        subject.execute
      end

    end

  end

end