dsl_spec.rb

require 'spec_helper'

describe Guard::Dsl do
  subject { described_class }
  before(:each) do
    @local_guardfile_path = File.join(Dir.pwd, 'Guardfile')
    @home_guardfile_path  = File.expand_path(File.join("~", "Guardfile"))
    ::Guard.stub!(:options).and_return(:debug => true)
  end

  describe "it should select the correct data source for Guardfile" do

    before(:each) do
      ::Guard::Dsl.stub!(:instance_eval_guardfile)
    end

    it "should use a string for initializing" do
      Guard::UI.should_not_receive(:error)
      lambda { subject.evaluate_guardfile(:guardfile_contents => valid_guardfile_string) }.should_not raise_error
      subject.guardfile_contents.should == valid_guardfile_string
    end
    it "should use a -command file over the default loc" do
      fake_guardfile('/abc/Guardfile', "guard :foo")

      Guard::UI.should_not_receive(:error)
      lambda { subject.evaluate_guardfile(:guardfile => '/abc/Guardfile') }.should_not raise_error
      subject.guardfile_contents.should == "guard :foo"
    end

    it "should use a default file if no other options are given" do
      fake_guardfile(@local_guardfile_path, "guard :bar")

      Guard::UI.should_not_receive(:error)
      lambda { subject.evaluate_guardfile }.should_not raise_error
      subject.guardfile_contents.should == "guard :bar"
    end

    it "should use a string over any other method" do
      fake_guardfile('/abc/Guardfile', "guard :foo")
      fake_guardfile(@local_guardfile_path, "guard :bar")

      Guard::UI.should_not_receive(:error)
      lambda { subject.evaluate_guardfile(:guardfile_contents => valid_guardfile_string) }.should_not raise_error
      subject.guardfile_contents.should == valid_guardfile_string
    end

    it "should use the given Guardfile over default Guardfile" do
      fake_guardfile('/abc/Guardfile', "guard :foo")
      fake_guardfile(@local_guardfile_path, "guard :bar")

      Guard::UI.should_not_receive(:error)
      lambda { subject.evaluate_guardfile(:guardfile => '/abc/Guardfile') }.should_not raise_error
      subject.guardfile_contents.should == "guard :foo"
    end
  end

  it "displays an error message when no Guardfile is found" do
    subject.stub(:guardfile_default_path).and_return("no_guardfile_here")
    Guard::UI.should_receive(:error).with("No Guardfile found, please create one with `guard init`.")
    lambda { subject.evaluate_guardfile }.should raise_error
  end

  describe "it should correctly read data from its valid data source" do
    before(:each) do
      ::Guard::Dsl.stub!(:instance_eval_guardfile)
    end

    it "should read correctly from a string" do
      lambda { subject.evaluate_guardfile(:guardfile_contents => valid_guardfile_string) }.should_not raise_error
      subject.guardfile_contents.should == valid_guardfile_string
    end

    it "should read correctly from a Guardfile" do
      fake_guardfile('/abc/Guardfile', "guard :foo" )

      lambda { subject.evaluate_guardfile(:guardfile => '/abc/Guardfile') }.should_not raise_error
      subject.guardfile_contents.should == "guard :foo"
    end

    it "should read correctly from a Guardfile" do
      fake_guardfile(File.join(Dir.pwd, 'Guardfile'), valid_guardfile_string)

      lambda { subject.evaluate_guardfile }.should_not raise_error
      subject.guardfile_contents.should == valid_guardfile_string
    end
  end

  describe "It should correctly throw errors when initializing with invalid data" do
    before(:each) do
      ::Guard::Dsl.stub!(:instance_eval_guardfile)
    end

    it "should raise error when there's a problem reading a file" do
      File.stub!(:exist?).with('/def/Guardfile') { true }
      File.stub!(:read).with('/def/Guardfile')   { raise Errno::EACCES.new("permission error") }

      Guard::UI.should_receive(:error).with(/^Error reading file/)
      lambda { subject.evaluate_guardfile(:guardfile => '/def/Guardfile') }.should raise_error
    end

    it "should raise error when -guardfile doesn't exist" do
      File.stub!(:exist?).with('/def/Guardfile') { false }

      Guard::UI.should_receive(:error).with(/No Guardfile exists at/)
      lambda { subject.evaluate_guardfile(:guardfile => '/def/Guardfile') }.should raise_error
    end

    it "should raise error when resorting to use default, finds no default" do
      File.stub!(:exist?).with(@local_guardfile_path) { false }
      File.stub!(:exist?).with(@home_guardfile_path) { false }

      Guard::UI.should_receive(:error).with("No Guardfile found, please create one with `guard init`.")
      lambda { subject.evaluate_guardfile }.should raise_error
    end

    it "should raise error when guardfile_content ends up empty or nil" do
      Guard::UI.should_receive(:error).twice.with(/The command file/)
      lambda { subject.evaluate_guardfile(:guardfile_contents => "") }.should raise_error
      lambda { subject.evaluate_guardfile(:guardfile_contents => nil) }.should raise_error
    end

  end

  it "displays an error message when Guardfile is not valid" do
    Guard::UI.should_receive(:error).with(/Invalid Guardfile, original error is:/)

    lambda { subject.evaluate_guardfile(:guardfile_contents => invalid_guardfile_string ) }.should raise_error
  end

  describe ".guardfile_default_path" do
    let(:local_path) { File.join(Dir.pwd, 'Guardfile') }
    let(:user_path) { File.expand_path(File.join("~", 'Guardfile')) }

    before do
      File.stub(:exist? => false)
    end

    context "when there is a local Guardfile" do
      it "returns the path to the local Guardfile" do
        File.stub(:exist?).with(local_path).and_return(true)
        subject.guardfile_default_path.should == local_path
      end
    end

    context "when there is a Guardfile in the user's home directory" do
      it "returns the path to the user Guardfile" do
        File.stub(:exist?).with(user_path).and_return(true)
        subject.guardfile_default_path.should == user_path
      end
    end

    context "when there's both a local and user Guardfile" do
      it "returns the path to the local Guardfile" do
        File.stub(:exist?).with(local_path).and_return(true)
        File.stub(:exist?).with(user_path).and_return(true)
        subject.guardfile_default_path.should == local_path
      end
    end

  end

  describe ".guardfile_include?" do
    it "detects a guard specified by a string with double quotes" do
      subject.stub(:guardfile_contents => 'guard "test" {watch("c")}')

      subject.guardfile_include?('test').should be_true
    end

    it "detects a guard specified by a string with single quote" do
      subject.stub(:guardfile_contents => 'guard \'test\' {watch("c")}')

      subject.guardfile_include?('test').should be_true
    end

    it "detects a guard specified by a symbol" do
      subject.stub(:guardfile_contents => 'guard :test {watch("c")}')

      subject.guardfile_include?('test').should be_true
    end

    it "detects a guard wrapped in parentheses" do
      subject.stub(:guardfile_contents => 'guard(:test) {watch("c")}')

      subject.guardfile_include?('test').should be_true
    end
  end

  describe "#group" do
    it "should evaluates only the specified group" do
      ::Guard.should_receive(:add_guard).with('test', anything, {})
      lambda { subject.evaluate_guardfile(:guardfile_contents => valid_guardfile_string, :group => ['x']) }.should_not raise_error
    end
    it "should evaluates only the specified groups" do
      ::Guard.should_receive(:add_guard).with('test', anything, {})
      ::Guard.should_receive(:add_guard).with('another', anything, {})
      lambda { subject.evaluate_guardfile(:guardfile_contents => valid_guardfile_string, :group => ['x','y']) }.should_not raise_error
    end
  end

  # TODO: not sure if each seperate quoting/call type needs its own test
  describe "#guard" do
    it "should load a guard specified as a quoted string from the DSL" do
      ::Guard.should_receive(:add_guard).with('test', [], {})

      subject.evaluate_guardfile(:guardfile_contents => "guard 'test'")
    end

    it "should load a guard specified as a symbol from the DSL" do
      ::Guard.should_receive(:add_guard).with(:test, [], {})

      subject.evaluate_guardfile(:guardfile_contents => "guard :test")
    end

    it "should load a guard specified as a symbol and called with parens from the DSL" do
      ::Guard.should_receive(:add_guard).with(:test, [], {})

      subject.evaluate_guardfile(:guardfile_contents => "guard(:test)")
    end

    it "should receive options when specified" do
      ::Guard.should_receive(:add_guard).with('test', anything, { :opt_a => 1, :opt_b => 'fancy' })

      subject.evaluate_guardfile(:guardfile_contents => "guard 'test', :opt_a => 1, :opt_b => 'fancy'")
    end

  end

  describe "#watch" do
    it "should receive watchers when specified" do
      guardfile_with_watchers = "guard 'test' do
                                   watch('a') { 'b' }
                                   watch('c')
                                 end"

      ::Guard.should_receive(:add_guard).with('test', anything, {}) do |name, watchers, options|
        watchers.size.should == 2
        watchers[0].pattern.should     == 'a'
        watchers[0].action.call.should == proc { 'b' }.call
        watchers[1].pattern.should     == 'c'
        watchers[1].action.should == nil
      end
      subject.evaluate_guardfile(:guardfile_contents => guardfile_with_watchers)
    end
  end

private

  def fake_guardfile(name, contents)
    File.stub!(:exist?).with(name) { true }
    File.stub!(:read).with(name)   { contents }
  end

  def valid_guardfile_string
   "group :x do
      guard 'test' do
        watch('c')
      end
    end

    group 'y' do
      guard 'another' do
        watch('c')
      end
    end

    group 'z' do
      guard 'another' do
        watch('c')
      end
    end"
  end

  def mock_guardfile_content(content)
    File.stub!(:read).with(subject.guardfile_default_path) { content }
  end

  def invalid_guardfile_string
   "Bad Guardfile"
  end
end