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@@ -1,9 +1,15 @@
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+2008-06-18  Eric Hodel  <drbrain@segment7.net>
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+
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+	* lib/rubygems/commands/dependency_command.rb:  Restore matching
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+	everything when no name is specified, regexp matching.  Fixes bug
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+	#20716, bug #20717 by Chad Wooley.
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+
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 2008-06-18  Chad Woolley  <thewoolleyman@gmail.com>
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   * lib/rubygems/config_file.rb:  Fix --config-file option with no
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   equals and subsequent options to properly assign config file.
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   Previously config file was overwritten by subsequent option.
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-	Fixes Bug 16688.
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+	Fixes bug #16688.
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 2008-06-17  Eric Hodel  <drbrain@segment7.net>
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@@ -43,14 +43,21 @@ class Gem::Commands::DependencyCommand < Gem::Command
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   end
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   def execute
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-    options[:args] << '.' if options[:args].empty?
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+    options[:args] << '' if options[:args].empty?
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     specs = {}
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     source_indexes = Hash.new do |h, source_uri|
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       h[source_uri] = Gem::SourceIndex.new
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     end
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-    pattern = /\A#{Regexp.union(*options[:args])}/
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+    pattern = if options[:args].length == 1 and
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+                 options[:args].first =~ /\A\/(.*)\/(i)?\z/m then
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+                flags = $2 ? Regexp::IGNORECASE : nil
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+                Regexp.new $1, flags
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+              else
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+                /\A#{Regexp.union(*options[:args])}/
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+              end
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+
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     dependency = Gem::Dependency.new pattern, options[:version]
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     if options[:reverse_dependencies] and remote? and not local? then

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@@ -30,6 +30,34 @@ class TestGemCommandsDependencyCommand < RubyGemTestCase
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     assert_equal '', @ui.error
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   end
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+  def test_execute_no_args
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+    Gem.source_index = nil
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+
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+    @cmd.options[:args] = []
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+
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+    use_ui @ui do
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+      @cmd.execute
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+    end
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+
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+    expected = <<-EOF
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+Gem a-1
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+
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+Gem a-2
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+
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+Gem a_evil-9
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+
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+Gem b-2
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+
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+Gem c-1.2
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+
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+Gem pl-1-x86-linux
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+
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+    EOF
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+
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+    assert_equal expected, @ui.output
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+    assert_equal '', @ui.error
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+  end
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+
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   def test_execute_no_match
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     @cmd.options[:args] = %w[foo]
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@@ -59,6 +87,30 @@ class TestGemCommandsDependencyCommand < RubyGemTestCase
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     assert_equal '', @ui.error
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   end
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+  def test_execute_regexp
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+    Gem.source_index = nil
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+
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+    @cmd.options[:args] = %w[/[ab]/]
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+
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+    use_ui @ui do
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+      @cmd.execute
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+    end
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+
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+    expected = <<-EOF
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+Gem a-1
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+
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+Gem a-2
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+
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+Gem a_evil-9
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+
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+Gem b-2
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+
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+    EOF
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+
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+    assert_equal expected, @ui.output
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+    assert_equal '', @ui.error
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+  end
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+
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   def test_execute_reverse
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     quick_gem 'foo' do |gem|
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       gem.add_dependency 'bar', '> 1'