added checkout_index

README

@@ -228,4 +228,20 @@ Some examples of more low-level index and tree operations
      end    
    end
 
-   g.set_index('/path/to/index')
+   g.set_index('/path/to/index')
+
+
+   g.with_index(path) do 
+     # calls set_index, then switches back after
+   end
+
+   g.with_working(dir) do
+   # calls set_working, then switches back after
+   end
+
+   g.with_temp_working(dir) do
+     g.checkout_index(:prefix => dir, :path_limiter => path)
+     # do file work
+     g.commit # commits to index
+   end
+

lib/git/base.rb

@@ -361,6 +361,10 @@ def with_temp_index &blk
       with_index(temp_path, &blk)
     end
 
+    def checkout_index(opts = {})
+      self.lib.checkout_index(opts)
+    end
+
     def read_tree(treeish, opts = {})
       self.lib.read_tree(treeish, opts)
     end
@@ -382,6 +386,7 @@ def update_ref(branch, commit)
       branch(branch).update_ref(commit)
     end
 
+
     def ls_files
       self.lib.ls_files
     end

lib/git/lib.rb

@@ -380,6 +380,14 @@ def update_ref(branch, commit)
       command('update-ref', [branch.to_s, commit.to_s])
     end
 
+    def checkout_index(opts = {})
+      arr_opts = []
+      arr_opts << "--prefix=#{opts[:prefix]}" if opts[:prefix]
+      arr_opts << "--force" if opts[:force]
+      arr_opts << "--all" if opts[:all]
+      arr_opts << ('-- ' + opts[:path_limiter]) if opts[:path_limiter].is_a? String
+      command('checkout-index', arr_opts)
+    end
 
     # creates an archive file
     #

tests/units/test_tree_ops.rb

@@ -106,6 +106,14 @@ def test_read_tree
 
         assert_equal('b40f7a9072cdec637725700668f8fdebe39e6d38', c.gtree.sha)
 
+        g.with_temp_working do 
+          assert(!File.directory?('b1'))
+          g.checkout_index
+          assert(!File.directory?('b1'))
+          g.checkout_index(:all => true)
+          assert(File.directory?('b1'))
+        end
+
       end
     end
   end