[rubygems/rubygems] Simplify #to_ruby code

Separate #add_runtime_dependency and #add_development_dependency
availability condition from #specification_version availability,
which is not related to directly.
Also check if the former method is available, instead of comparing
the version.

https://github.com/rubygems/rubygems/commit/5cccc2b836

lib/rubygems/specification.rb

@@ -2476,25 +2476,17 @@ class Gem::Specification < Gem::BasicSpecification
       result << nil
       result << "  if s.respond_to? :specification_version then"
       result << "    s.specification_version = #{specification_version}"
+      result << "  end"
       result << nil
 
-      result << "    if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then"
+      result << "  if s.respond_to? :add_runtime_dependency then"
 
       dependencies.each do |dep|
         req = dep.requirements_list.inspect
         dep.instance_variable_set :@type, :runtime if dep.type.nil? # HACK
-        result << "      s.add_#{dep.type}_dependency(%q<#{dep.name}>.freeze, #{req})"
+        result << "    s.add_#{dep.type}_dependency(%q<#{dep.name}>.freeze, #{req})"
       end
 
-      result << "    else"
-
-      dependencies.each do |dep|
-        version_reqs_param = dep.requirements_list.inspect
-        result << "      s.add_dependency(%q<#{dep.name}>.freeze, #{version_reqs_param})"
-      end
-
-      result << '    end'
-
       result << "  else"
       dependencies.each do |dep|
         version_reqs_param = dep.requirements_list.inspect

test/rubygems/test_gem_specification.rb

@@ -2428,12 +2428,10 @@ Gem::Specification.new do |s|
 
   if s.respond_to? :specification_version then
     s.specification_version = #{Gem::Specification::CURRENT_SPECIFICATION_VERSION}
+  end
 
-    if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
-      s.add_runtime_dependency(%q<b>.freeze, [\"= 1\"])
-    else
-      s.add_dependency(%q<b>.freeze, [\"= 1\"])
-    end
+  if s.respond_to? :add_runtime_dependency then
+    s.add_runtime_dependency(%q<b>.freeze, [\"= 1\"])
   else
     s.add_dependency(%q<b>.freeze, [\"= 1\"])
   end
@@ -2478,12 +2476,10 @@ Gem::Specification.new do |s|
 
   if s.respond_to? :specification_version then
     s.specification_version = #{Gem::Specification::CURRENT_SPECIFICATION_VERSION}
+  end
 
-    if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
-      s.add_runtime_dependency(%q<b>.freeze, [\"= 1\"])
-    else
-      s.add_dependency(%q<b>.freeze, [\"= 1\"])
-    end
+  if s.respond_to? :add_runtime_dependency then
+    s.add_runtime_dependency(%q<b>.freeze, [\"= 1\"])
   else
     s.add_dependency(%q<b>.freeze, [\"= 1\"])
   end
@@ -2539,16 +2535,12 @@ Gem::Specification.new do |s|
 
   if s.respond_to? :specification_version then
     s.specification_version = 4
+  end
 
-    if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
-      s.add_runtime_dependency(%q<rake>.freeze, [\"> 0.4\"])
-      s.add_runtime_dependency(%q<jabber4r>.freeze, [\"> 0.0.0\"])
-      s.add_runtime_dependency(%q<pqa>.freeze, [\"> 0.4\", \"<= 0.6\"])
-    else
-      s.add_dependency(%q<rake>.freeze, [\"> 0.4\"])
-      s.add_dependency(%q<jabber4r>.freeze, [\"> 0.0.0\"])
-      s.add_dependency(%q<pqa>.freeze, [\"> 0.4\", \"<= 0.6\"])
-    end
+  if s.respond_to? :add_runtime_dependency then
+    s.add_runtime_dependency(%q<rake>.freeze, [\"> 0.4\"])
+    s.add_runtime_dependency(%q<jabber4r>.freeze, [\"> 0.0.0\"])
+    s.add_runtime_dependency(%q<pqa>.freeze, [\"> 0.4\", \"<= 0.6\"])
   else
     s.add_dependency(%q<rake>.freeze, [\"> 0.4\"])
     s.add_dependency(%q<jabber4r>.freeze, [\"> 0.0.0\"])