From e36a75bc40ce5dfb49cb4d8bdcb5b5afc66137f4 Mon Sep 17 00:00:00 2001
From: Samuel Giddins <segiddins@segiddins.me>
Date: Thu, 1 Oct 2015 23:44:14 -0500
Subject: [Resolver] Resolve for a given ruby version

---
 lib/bundler/definition.rb  |  2 +-
 lib/bundler/index.rb       |  1 +
 lib/bundler/resolver.rb    | 21 ++++++++++++++-------
 lib/bundler/source/path.rb |  2 +-
 4 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/lib/bundler/definition.rb b/lib/bundler/definition.rb
index d1849e484a..cb527de739 100644
--- a/lib/bundler/definition.rb
+++ b/lib/bundler/definition.rb
@@ -196,7 +196,7 @@ module Bundler
           last_resolve
         else
           # Run a resolve against the locally available gems
-          last_resolve.merge Resolver.resolve(expanded_dependencies, index, source_requirements, last_resolve)
+          last_resolve.merge Resolver.resolve(expanded_dependencies, index, source_requirements, last_resolve, ruby_version.version)
         end
       end
     end
diff --git a/lib/bundler/index.rb b/lib/bundler/index.rb
index d3753f0c66..77ef4b85eb 100644
--- a/lib/bundler/index.rb
+++ b/lib/bundler/index.rb
@@ -79,6 +79,7 @@ module Bundler
       when Gem::Specification, RemoteSpecification, LazySpecification, EndpointSpecification then search_by_spec(query)
       when String then specs_by_name(query)
       when Gem::Dependency then search_by_dependency(query, base)
+      when DepProxy then search_by_dependency(query.dep, base)
       else
         raise "You can't search for a #{query.inspect}."
       end
diff --git a/lib/bundler/resolver.rb b/lib/bundler/resolver.rb
index 439f7d4962..cf3bdd333f 100644
--- a/lib/bundler/resolver.rb
+++ b/lib/bundler/resolver.rb
@@ -108,7 +108,7 @@ module Bundler
 
       def activate_platform(platform)
         unless @activated.include?(platform)
-          if for?(platform)
+          if for?(platform, nil)
             @activated << platform
             return __dependencies[platform] || []
           end
@@ -128,8 +128,14 @@ module Bundler
         @source ||= first.source
       end
 
-      def for?(platform)
-        @specs[platform]
+      def for?(platform, required_ruby_version)
+        if spec = @specs[platform]
+          if required_ruby_version && spec_required_ruby_version = spec.required_ruby_version
+            spec_required_ruby_version.satisfied_by?(required_ruby_version)
+          else
+            true
+          end
+        end
       end
 
       def to_s
@@ -173,14 +179,14 @@ module Bundler
     # ==== Returns
     # <GemBundle>,nil:: If the list of dependencies can be resolved, a
     #   collection of gemspecs is returned. Otherwise, nil is returned.
-    def self.resolve(requirements, index, source_requirements = {}, base = [])
+    def self.resolve(requirements, index, source_requirements = {}, base = [], ruby_version = nil)
       base = SpecSet.new(base) unless base.is_a?(SpecSet)
-      resolver = new(index, source_requirements, base)
+      resolver = new(index, source_requirements, base, ruby_version)
       result = resolver.start(requirements)
       SpecSet.new(result)
     end
 
-    def initialize(index, source_requirements, base)
+    def initialize(index, source_requirements, base, ruby_version)
       @index = index
       @source_requirements = source_requirements
       @base = base
@@ -188,6 +194,7 @@ module Bundler
       @search_for = {}
       @base_dg = Molinillo::DependencyGraph.new
       @base.each {|ls| @base_dg.add_vertex(ls.name, Dependency.new(ls.name, ls.version), true) }
+      @ruby_version = Gem::Version.create(ruby_version) if ruby_version
     end
 
     def start(requirements)
@@ -267,7 +274,7 @@ module Bundler
           []
         end
       end
-      search.select {|sg| sg.for?(platform) }.each {|sg| sg.activate_platform(platform) }
+      search.select {|sg| sg.for?(platform, @ruby_version) }.each {|sg| sg.activate_platform(platform) }
     end
 
     def name_for(dependency)
diff --git a/lib/bundler/source/path.rb b/lib/bundler/source/path.rb
index d47fe0dea6..292412044c 100644
--- a/lib/bundler/source/path.rb
+++ b/lib/bundler/source/path.rb
@@ -49,7 +49,7 @@ module Bundler
       end
 
       def to_s
-        "source at #{@path}"
+        "source at `#{@path}`"
       end
 
       def hash
-- 
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