Return the command's exit code from Shell#result, not a boolean like …

…#ok?.

lib/babushka/shell.rb

@@ -8,11 +8,11 @@ def initialize cmd, opts
       @cmd, @opts = (cmd.is_a?(Array) ? cmd : [cmd]), opts
     end
 
-    def ok?; result end
+    def ok?; result == 0 end
 
     def run &block
       @stdout, @stderr = '', ''
-      @result = invoke == 0
+      @result = invoke
       print "#{" " * (@progress.length + 1)}#{"\b" * (@progress.length + 1)}" unless @progress.nil?
 
       if block_given?

spec/babushka/shell_spec.rb

@@ -0,0 +1,19 @@
+require 'spec_helper'
+
+describe Shell, '#ok?' do
+  it "should return true on success" do
+    Shell.new('true', {}).run(&:ok?).should be_true
+  end
+  it "should return false on failure" do
+    Shell.new('false', {}).run(&:ok?).should be_false
+  end
+end
+
+describe Shell, '#result' do
+  it "should return zero on success" do
+    Shell.new('true', {}).run(&:result).should == 0
+  end
+  it "should return non-zero on failure" do
+    Shell.new('false', {}).run(&:result).should == 1
+  end
+end