Add a new option: --all-versions

lib/rubygems/commands/dependent_command.rb

@@ -19,6 +19,10 @@ def initialize
     add_option('--parallel N', Integer, 'Make N requests in parallel') do |n, _|
       options[:parallel] = n
     end
+
+    add_option('--all-versions', 'Check against all versions of gems') do
+      options[:all_versions] = true
+    end
   end
 
   def arguments

lib/rubygems/dependent.rb

@@ -8,7 +8,7 @@ class Dependent
     def self.find(gem, options={})
       # get all gems
       specs_and_sources = with_changed_gem_source(options[:source]) do
-        all_specs_and_sources
+        all_specs_and_sources(options[:all_versions])
       end
 
       if options[:fetch_limit]
@@ -62,14 +62,14 @@ def self.print_dot
       $stderr.flush if rand(20) == 0 # make progress visible
     end
 
-    def self.all_specs_and_sources
+    def self.all_specs_and_sources(all_versions = false)
       fetcher = Gem::SpecFetcher.fetcher
       all = true
       matching_platform = false
       prerelease = false
       matcher = Gem::Dependency.new(//, Gem::Requirement.default) # any name, any version
       specs_and_sources = fetcher.find_matching matcher, all, matching_platform, prerelease
-      uniq_by(specs_and_sources){|a| a.first.first }
+      all_versions ? specs_and_sources : uniq_by(specs_and_sources){|a| a.first.first }
     end
 
     # get unique elements from an array (last found is used)

spec/dependent_spec.rb

@@ -27,9 +27,11 @@ def simplify(dependencies)
     dependencies.map{|name, deps| [name, deps.map{|d| d.name}] }
   end
 
-  def stub_source(gem_source = nil)
+  def stub_source(gem_source = nil, check_against_fixtures = true)
     gem_source ||= 'http://gemcutter.org'
-    Gem::SpecFetcher.fetcher.should_receive(:load_specs).with(URI.parse(gem_source), 'specs').and_return(fixture)
+    if check_against_fixtures
+      Gem::SpecFetcher.fetcher.should_receive(:load_specs).with(URI.parse(gem_source), 'specs').and_return(fixture)
+    end
     Gem.sources = [gem_source]
   end
 
@@ -57,6 +59,12 @@ def stub_source(gem_source = nil)
     Gem::Dependent.find('hoe', :parallel => 3)
   end
 
+  it "obeys all versions option" do
+    stub_source(nil, false)
+    Gem::Dependent.should_receive(:all_specs_and_sources).with(true)
+    Gem::Dependent.find('hoe', :all_versions => true)
+  end
+
   it "has a VERSION" do
     Gem::Dependent::VERSION.should =~ /^\d+\.\d+\.\d+$/
   end