Add preliminary support for autotest

To use autotest with rspec2, add an autotest directory to
the root of your project, and then autotest/discover.rb with:

    Autotest.add_discovery { "rspec2" }

Closes #13.

autotest/discover.rb

@@ -0,0 +1,2 @@
+Autotest.add_discovery { "rspec2" }
+

lib/autotest/rspec2.rb

@@ -0,0 +1,54 @@
+require 'autotest'
+
+Autotest.add_hook :initialize do |at|
+  at.clear_mappings
+  # watch out for Ruby bug (1.8.6): %r(/) != /\//
+  at.add_mapping(%r%^spec/.*_spec\.rb$%) { |filename, _|
+    filename
+  }
+  at.add_mapping(%r%^lib/(.*)\.rb$%) { |_, m|
+    ["spec/#{m[1]}_spec.rb"]
+  }
+  at.add_mapping(%r%^spec/(spec_helper|shared/.*)\.rb$%) {
+    at.files_matching %r%^spec/.*_spec\.rb$%
+  }
+end
+
+class RspecCommandError < StandardError; end
+
+class Autotest::Rspec2 < Autotest
+
+  SPEC_PROGRAM = File.expand_path(File.join(File.dirname(__FILE__), '..', '..', 'bin', 'rspec'))
+
+  def initialize
+    super
+    self.failed_results_re = /^\d+\)\n(?:\e\[\d*m)?(?:.*?in )?'([^\n]*)'(?: FAILED)?(?:\e\[\d*m)?\n\n?(.*?(\n\n\(.*?)?)\n\n/m
+    self.completed_re = /\n(?:\e\[\d*m)?\d* examples?/m
+  end
+
+  def consolidate_failures(failed)
+    filters = new_hash_of_arrays
+    failed.each do |spec, trace|
+      if trace =~ /\n(\.\/)?(.*spec\.rb):[\d]+:/
+        filters[$2] << spec
+      end
+    end
+    return filters
+  end
+
+  def make_test_cmd(files_to_test)
+    files_to_test.empty? ? '' :
+      "#{ruby} #{SPEC_PROGRAM} #{normalize(files_to_test).keys.flatten.join(' ')} #{add_options_if_present}"
+  end
+
+  def normalize(files_to_test)
+    files_to_test.keys.inject({}) do |result, filename|
+      result[File.expand_path(filename)] = []
+      result
+    end
+  end
+
+  def add_options_if_present # :nodoc:
+    File.exist?("spec/spec.opts") ? "-O #{File.join('spec','spec.opts')} " : ""
+  end
+end

rspec-core.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
 
   s.required_rubygems_version = Gem::Requirement.new("> 1.3.1") if s.respond_to? :required_rubygems_version=
   s.authors = ["Chad Humphries", "David Chelimsky"]
-  s.date = %q{2010-03-09}
+  s.date = %q{2010-03-14}
   s.description = %q{Rspec runner and example group classes}
   s.email = %q{dchelimsky@gmail.com;chad.humphries@gmail.com}
   s.executables = ["rspec", "spec"]
@@ -95,6 +95,7 @@ Gem::Specification.new do |s|
      "features/subject/explicit_subject.feature",
      "features/subject/implicit_subject.feature",
      "features/support/env.rb",
+     "lib/autotest/rspec2.rb",
      "lib/rspec/autorun.rb",
      "lib/rspec/core.rb",
      "lib/rspec/core/around_proxy.rb",