add opposite env feature for less repetition

README.md

@@ -73,6 +73,15 @@ no_deployment do
       gems dev_gems, :github => 'johnbintz'
     end
 
+    # an even shorter way to specify environments!
+    # in remote env, expands to:
+    #     gem 'bullseye', :git => 'git://github.com/johnbintz/bullseye.git'
+    # in local env, expands to:
+    #     gem 'bullseye', :path => '../bullseye'
+    env :remote, :opposite => :local do
+      gem 'bullseye', :github => 'johnbintz'
+    end
+
     # only expanded on Mac OS X
     os :darwin do
       gem 'rb-fsevent'

features/ruby_gemfile.feature

@@ -235,6 +235,34 @@ Feature: Gemfiles
       gem "one", "1.2.3", {:path=>"../one"}
       """
 
+  Scenario: Create opposite environment gem assumptions to cut down on repetition
+    Given I have the file "Gemfile.penchant" with the content:
+      """
+      defaults_for env(:local), :path => '../%s'
+      property(:github) { |name| { :git => "git://github.com/#{name}/%s.git" } }
+
+      env :remote, :opposite => :local do
+        gem 'one', :github => 'johnbintz', :require => nil
+      end
+      env :local, :opposite => :remote do
+        gem 'two', :path => '../%s', :require => nil
+      end
+      """
+    When I rebuild the Gemfile for "local" mode
+    Then the file "Gemfile" should have the following content:
+      """
+      # generated by penchant, environment: local
+      gem "one", {:path=>"../one", :require=>nil}
+      gem "two", {:path=>"../two", :require=>nil}
+      """
+    When I rebuild the Gemfile for "remote" mode
+    Then the file "Gemfile" should have the following content:
+      """
+      # generated by penchant, environment: remote
+      gem "one", {:git=>"git://github.com/johnbintz/one.git", :require=>nil}
+      gem "two", {:require=>nil}
+      """
+
   Scenario: Override defaults for an environment
     Given I have the file "Gemfile.penchant" with the content:
       """

lib/penchant/gemfile.rb

@@ -138,6 +138,9 @@ module Penchant
       end
 
       def env(*args)
+        options = {}
+        options = args.pop if args.last.kind_of?(::Hash)
+
         @available_environments += args
 
         if block_given?
@@ -145,6 +148,16 @@ module Penchant
             @_current_env_defaults = _defaults_for(Env.new(environment))
             yield
             @_current_env_defaults = {}
+          else
+            if options[:opposite]
+              if for_environment?([ options[:opposite] ].flatten)
+                @_current_env_defaults = _defaults_for(Env.new(environment))
+                @_strip_pathing_options = true
+                yield
+                @_strip_pathing_options = false
+                @_current_env_defaults = {}
+              end
+            end
           end
         else
           Penchant::Gemfile::Env.new(args.shift)
@@ -203,7 +216,22 @@ module Penchant
       def process_options(gem_name, template = {})
         properties = {}
 
-        property_stack = _defaults_for(gem_name).dup.merge(template).to_a
+        property_stack = template.to_a
+
+        original_properties = process_option_stack(gem_name, property_stack)
+
+        if @_strip_pathing_options
+          [ :git, :branch, :path ].each { |key| original_properties.delete(key) }
+        end
+
+        properties = process_option_stack(gem_name, _defaults_for(gem_name).to_a).merge(original_properties)
+
+        Hash[properties.sort]
+      end
+
+      def process_option_stack(gem_name, stack)
+        property_stack = stack.dup
+        properties = {}
 
         while !property_stack.empty?
           key, value = property_stack.shift
@@ -227,8 +255,8 @@ module Penchant
             properties[key] = value
           end
         end
-
-        Hash[properties.sort]
+        
+        properties
       end
 
       def _defaults_for(gem_name)
@@ -322,12 +350,13 @@ module Penchant
 
         args = [ gem_name.first ]
         args << version if version
-        args << options if !options.empty?
 
         if options[:git]
           @defined_git_repos << Penchant::Repo.new(options[:git])
         end
 
+        args << options if !options.empty?
+
         @output << %{gem #{args_to_string(args)}}
       end
 

lib/penchant/version.rb

@@ -1,3 +1,3 @@
 module Penchant
-  VERSION = "0.2.20"
+  VERSION = "0.2.21"
 end