pry--pry/spec/sticky_locals_spec.rb

describe "Sticky locals (_file_ and friends)" do
  it 'locals should all exist upon initialization' do
    expect { pry_eval '_file_', '_dir_', '_ex_', '_pry_', '_' }.to_not raise_error
  end

  it 'locals should still exist after cd-ing into a new context' do
    expect { pry_eval 'cd 0', '_file_', '_dir_', '_ex_', '_pry_', '_' }.to_not raise_error
  end

  it 'locals should keep value after cd-ing (_pry_)' do
    pry_tester.tap do |t|
      pry = t.eval '_pry_'
      t.eval 'cd 0'
      expect(t.eval('_pry_')).to eq(pry)
    end
  end

  describe '_ex_' do
    it 'returns the last exception without wrapping it in a LastException' do
      ReplTester.start do
        input  'raise "halp"'

        input  '_ex_.message == "halp"'
        output '=> true'

        input  'Kernel.instance_method(:class).bind(_ex_).call'
        output '=> RuntimeError'
      end
    end

    it 'keeps its value after cd-ing' do
      ReplTester.start do
        input  'error blah'
        input  '$x = _ex_'
        input  'cd 0'

        input  '_ex_ == $x'
        output '=> true'
      end
    end
  end

  it 'locals should keep value after cd-ing (_file_ and _dir_)' do
    Pry.config.commands.command "file-and-dir-test" do
      set_file_and_dir_locals("/blah/ostrich.rb")
    end

    expect(pry_eval('file-and-dir-test', 'cd 0', '_file_'))
      .to match(%r{/blah/ostrich\.rb})

    expect(pry_eval('file-and-dir-test', 'cd 0', '_dir_'))
      .to match(%r{/blah})

    Pry.config.commands.delete "file-and-dir-test"
  end

  it 'locals should return last result (_)' do
    pry_tester.tap do |t|
      lam = t.eval 'lambda { |_foo| }'
      expect(t.eval('_')).to eq(lam)
    end
  end

  it 'locals should return second last result (__)' do
    pry_tester.tap do |t|
      lam = t.eval 'lambda { |_foo| }'
      t.eval 'num = 1'
      expect(t.eval('__')).to eq(lam)
    end
  end

  describe "User defined sticky locals" do
    describe "setting as Pry.config option" do
      it 'should define a new sticky local for the session (normal value)' do
        Pry.config.extra_sticky_locals[:test_local] = :john
        o = Object.new
        redirect_pry_io(InputTester.new("@value = test_local",
                                        "exit-all")) do
          Pry.start(o)
        end
        expect(o.instance_variable_get(:@value)).to eq :john
        Pry.config.extra_sticky_locals = {}
      end

      it 'should define a new sticky local for the session (proc)' do
        Pry.config.extra_sticky_locals[:test_local] = proc { :john }

        o = Object.new
        redirect_pry_io(InputTester.new("@value = test_local",
                                        "exit-all")) do
          Pry.start(o)
        end

        expect(o.instance_variable_get(:@value)).to eq :john
        Pry.config.extra_sticky_locals = {}
      end
    end

    describe "passing in as hash option when creating pry instance" do
      it 'should define a new sticky local for the session (normal value)' do
        o = Object.new
        redirect_pry_io(InputTester.new("@value = test_local",
                                        "exit-all")) do
          Pry.start(o, extra_sticky_locals: { test_local: :john })
        end

        expect(o.instance_variable_get(:@value)).to eq :john
      end

      it 'should define multiple sticky locals' do
        o = Object.new
        redirect_pry_io(
          InputTester.new(
            "@value1 = test_local1",
            "@value2 = test_local2",
            "exit-all"
          )
        ) do
          Pry.start(
            o,
            extra_sticky_locals: {
              test_local1: :john,
              test_local2: :carl
            }
          )
        end

        expect(o.instance_variable_get(:@value1)).to eq :john
        expect(o.instance_variable_get(:@value2)).to eq :carl
      end

      it 'should define a new sticky local for the session (as Proc)' do
        o = Object.new
        redirect_pry_io(InputTester.new("@value = test_local",
                                        "exit-all")) do
          Pry.start(o, extra_sticky_locals: { test_local: proc { :john } })
        end

        expect(o.instance_variable_get(:@value)).to eq :john
      end
    end

    describe "hash option value should override config value" do
      it 'should define a new sticky local for the session (normal value)' do
        Pry.config.extra_sticky_locals[:test_local] = :john

        o = Object.new
        redirect_pry_io(InputTester.new("@value = test_local",
                                        "exit-all")) do
          Pry.start(o, extra_sticky_locals: { test_local: :carl })
        end

        expect(o.instance_variable_get(:@value)).to eq :carl
        Pry.config.extra_sticky_locals = {}
      end
    end

    it 'should create a new sticky local' do
      t = pry_tester
      t.eval "_pry_.add_sticky_local(:test_local){ :test_value }"
      expect(t.eval("test_local")).to eq(:test_value)
    end

    it 'should still exist after cd-ing into new binding' do
      t = pry_tester
      t.eval "_pry_.add_sticky_local(:test_local){ :test_value }"
      t.eval "cd Object.new"
      expect(t.eval("test_local")).to eq(:test_value)
    end

    it 'should provide different values for successive block invocations' do
      pry = Pry.new
      pry.push_binding binding
      pry.add_sticky_local(:test_local) { rand }
      value1 = pry.evaluate_ruby 'test_local'
      value2 = pry.evaluate_ruby 'test_local'
      expect(value1).not_to eq(value2)
    end
  end
end