Make pod install take an optional podspec file to install the dependencies of…

Make pod install take an optional podspec file to install the dependencies of instead of looking for ./Podfile

.gitignore

@@ -2,3 +2,4 @@
 *.swo
 .DS_Store
 tmp
+examples/Pods

examples/TestLib.podspec

+Pod::Spec.new do
+  name 'TestLib'
+  version '1.0'
+  summary 'A spec of a lib, to test that it too can be used to develop the lib.'
+  source :git => 'http://example.local/test.git', :tag => 'v1.0'
+
+  dependency 'SSZipArchive', '> 0.1'
+  dependency 'JSONKit'
+  dependency 'ASIHTTPRequest', '1.8'
+end

lib/cocoa_pods/command/install.rb

 module Pod
   class Command
     class Install < Command
+      def initialize(*argv)
+        if podspec = argv.shift
+          @podspec = Pathname.new(podspec)
+        end
+        super
+      end
+
       def run
-        if config.project_podfile.exist?
-          spec = Specification.from_podfile(config.project_podfile)
-          Installer.new(spec, config.project_pods_root).install!
+        spec = nil
+        if @podspec
+          if @podspec.exist?
+            spec = Specification.from_podspec(@podspec)
+          else
+            raise "The specified podspec `#{@podspec}' doesn't exist."
+          end
         else
-          $stderr.puts "No Podfile found in current working directory."
+          if config.project_podfile.exist?
+            spec = Specification.from_podfile(config.project_podfile)
+          else
+            raise "No Podfile found in current working directory."
+          end
         end
+        Installer.new(spec, config.project_pods_root).install!
       end
     end
   end