[DSL] Add support for multi-platform gems with the gemspec method

lib/bundler/dsl.rb

@@ -50,22 +50,22 @@ def eval_gemfile(gemfile, contents = nil)
     end
 
     def gemspec(opts = nil)
-      path              = opts && opts[:path] || "."
-      glob              = opts && opts[:glob]
-      name              = opts && opts[:name] || "{,*}"
-      development_group = opts && opts[:development_group] || :development
+      opts ||= {}
+      path              = opts[:path] || "."
+      glob              = opts[:glob]
+      name              = opts[:name]
+      development_group = opts[:development_group] || :development
       expanded_path     = gemfile_root.join(path)
 
-      gemspecs = Dir[File.join(expanded_path, "#{name}.gemspec")]
+      gemspecs = Dir[File.join(expanded_path, "{,*}.gemspec")].map {|g| Bundler.load_gemspec(g) }.compact
+      gemspecs.select! {|s| s.name == name } if name
+      Index.sort_specs(gemspecs)
+      specs_by_name_and_version = gemspecs.group_by {|s| [s.name, s.version] }
 
-      case gemspecs.size
+      case specs_by_name_and_version.size
       when 1
-        spec = Bundler.load_gemspec(gemspecs.first)
-
-        unless spec
-          raise InvalidOption, "There was an error loading the gemspec at " \
-            "#{file}. Make sure you can build the gem, then try again"
-        end
+        specs = specs_by_name_and_version.values.first
+        spec = specs.find {|s| s.match_platform(Gem::Platform.local) } || specs.first
 
         @gemspecs << spec
 

lib/bundler/index.rb

@@ -67,12 +67,20 @@ def search(query, base = nil)
         end
       end
 
-      results.sort_by do |s|
+      sort_specs(results)
+    end
+
+    def self.sort_specs(specs)
+      specs.sort_by do |s|
         platform_string = s.platform.to_s
         [s.version, platform_string == RUBY ? NULL : platform_string]
       end
     end
 
+    def sort_specs(specs)
+      self.class.sort_specs(specs)
+    end
+
     def local_search(query, base = nil)
       case query
       when Gem::Specification, RemoteSpecification, LazySpecification, EndpointSpecification then search_by_spec(query)

spec/install/gemfile/gemspec_spec.rb

@@ -67,7 +67,7 @@
 
   it "should raise if there are too many gemspecs available" do
     build_lib("foo", :path => tmp.join("foo")) do |s|
-      s.write("foo2.gemspec", "")
+      s.write("foo2.gemspec", build_spec("foo", "4.0").first.to_ruby)
     end
 
     error = install_gemfile(<<-G, :expect_err => true)
@@ -196,7 +196,17 @@
       before do
         build_lib("foo", :path => tmp.join("foo")) do |s|
           s.add_dependency "rack", "=1.0.0"
-          s.platform = platform if explicit_platform
+        end
+
+        if explicit_platform
+          create_file(
+            tmp.join("foo", "foo-#{platform}.gemspec"),
+            build_spec("foo", "1.0", platform) do
+              dep "rack", "=1.0.0"
+              @spec.authors = "authors"
+              @spec.summary = "summary"
+            end.first.to_ruby
+          )
         end
 
         gemfile <<-G