pry--pry/spec/commands/cat_spec.rb

require 'helper'

describe "cat" do
  before do
    @str_output = StringIO.new

    @t = pry_tester do
      def insert_nil_input
        @pry.update_input_history(nil)
      end

      def last_exception=(e)
        @pry.last_exception = e
      end
    end
  end

  describe "on receiving a file that does not exist" do
    it 'should display an error message' do
      proc {
        @t.eval 'cat supercalifragilicious66'
      }.should.raise(StandardError).message.should =~ /Cannot open/
    end
  end

  describe "with --in" do
    it 'should display the last few expressions with indices' do
      @t.eval('10', '20', 'cat --in').should == unindent(<<-STR)
        1:
          10
        2:
          20
      STR
    end
  end

  describe "with --in 1" do
    it 'should display the first expression with no index' do
      @t.eval('10', '20', 'cat --in 1').should == "10\n"
    end
  end

  describe "with --in -1" do
    it 'should display the last expression with no index' do
      @t.eval('10', '20', 'cat --in -1').should == "20\n"
    end
  end

  describe "with --in 1..2" do
    it 'should display the given range with indices, omitting nils' do
      @t.eval '10'
      @t.insert_nil_input # normally happens when a command is executed
      @t.eval ':hello'

      @t.eval('cat --in 1..3').should == unindent(<<-EOS)
        1:
          10
        3:
          :hello
      EOS
    end
  end

  # this doesnt work so well on rbx due to differences in backtrace
  # so we currently skip rbx until we figure out a workaround
  describe "with --ex" do
    before do
      @o = Object.new

      # this is to test exception code (cat --ex)
      def @o.broken_method
        this method is broken
      end
    end

    if !Pry::Helpers::BaseHelpers.rbx?
      it 'cat --ex should display repl code that generated exception' do
        @t.eval unindent(<<-EOS)
          begin
            this raises error
          rescue => e
            _pry_.last_exception = e
          end
        EOS
        @t.eval('cat --ex').should =~ /\d+:(\s*) this raises error/
      end

      it 'cat --ex should correctly display code that generated exception' do
        begin
          @o.broken_method
        rescue => e
          @t.last_exception = e
        end
        @t.eval('cat --ex').should =~ /this method is broken/
      end
    end
  end

  describe "with --ex N" do
    it 'should cat first level of backtrace when --ex used with no argument ' do
      temp_file do |f|
        f << "bt number 1"
        f.flush
        @t.last_exception = mock_exception("#{f.path}:1", 'x', 'x')
        @t.eval('cat --ex').should =~ /bt number 1/
      end
    end

    it 'should cat first level of backtrace when --ex 0 used ' do
      temp_file do |f|
        f << "bt number 1"
        f.flush
        @t.last_exception = mock_exception("#{f.path}:1", 'x', 'x')
        @t.eval('cat --ex 0').should =~ /bt number 1/
      end
    end

    it 'should cat second level of backtrace when --ex 1 used ' do
      temp_file do |f|
        f << "bt number 2"
        f.flush
        @t.last_exception = mock_exception('x', "#{f.path}:1", 'x')
        @t.eval('cat --ex 1').should =~ /bt number 2/
      end
    end

    it 'should cat third level of backtrace when --ex 2 used' do
      temp_file do |f|
        f << "bt number 3"
        f.flush
        @t.last_exception = mock_exception('x', 'x', "#{f.path}:1")
        @t.eval('cat --ex 2').should =~ /bt number 3/
      end
    end

    it 'should show error when backtrace level out of bounds' do
      @t.last_exception = mock_exception('x', 'x', 'x')
      proc {
        @t.eval('cat --ex 3')
      }.should.raise(Pry::CommandError).message.should =~ /out of bounds/
    end

    it 'each successive cat --ex should show the next level of backtrace, and going past the final level should return to the first' do
      temp_files = []
      3.times do |i|
        temp_files << Tempfile.new(['pry', '*.rb'])
        temp_files.last << "bt number #{i}"
        temp_files.last.flush
      end

      @t.last_exception = mock_exception(*temp_files.map { |f| "#{f.path}:1" })

      3.times do |i|
        @t.eval('cat --ex').should =~ /bt number #{i}/
      end

      @t.eval('cat --ex').should =~ /bt number 0/

      temp_files.each do |file|
        file.close(true)
      end
    end
  end
end