Change --from_file usage

README.md

@@ -57,12 +57,12 @@ The `--class_name_filter` option is similar to the `--path_filter` options excep
 
 The `--to_file` option dumps the dependency graph data to a file so you can do filtering later, it does not create a dot file.
 
-The `--from_file` option is used with the file dumped through `--to_file`. When you use this option the tests (or block) are not ran, the dependency graph is loaded directly from the file. This is useful to avoid rerunning code that didn't change just for the purpose of filtering with different combinations e.g.:
+The `--from_file` option is only available when you don't specify a test command. Its argument is the file dumped through `--to_file` in a previous run. When you use this option the tests (or block) are not ran, the dependency graph is loaded directly from the file. This is useful to avoid rerunning code that didn't change just for the purpose of filtering with different combinations e.g.:
 
 ```bash
 rubydeps rspec2 --to_file='dependencies.dump'
-rubydeps rspec2 --from_file='dependencies.dump' --path_filter='app/models'
-rubydeps rspec2 --from_file='dependencies.dump' --path_filter='app/models|app/controllers'
+rubydeps --from_file='dependencies.dump' --path_filter='app/models'
+rubydeps --from_file='dependencies.dump' --path_filter='app/models|app/controllers'
 ```
 
 Library usage

bin/rubydeps

@@ -6,7 +6,6 @@ module Rubydeps
   class Runner < Thor
     desc "testunit", "Create the dependency graph after runnning the testunit tests"
     method_option :to_file, :type => :string
-    method_option :from_file, :type => :string
     method_option :path_filter, :type => :string, :default => `pwd`.chomp, :required => true
     method_option :class_name_filter, :type => :string, :default => '', :required => true
     def testunit
@@ -28,7 +27,6 @@ module Rubydeps
 
     desc "rspec", "Create the dependency graph after runnning the rspec tests"
     method_option :to_file, :type => :string
-    method_option :from_file, :type => :string
     #TODO: this breaks when using underscores, investigate
     method_option :path_filter, :type => :string, :default => `pwd`.chomp, :required => true
     method_option :class_name_filter, :type => :string, :default => '', :required => true
@@ -44,9 +42,17 @@ module Rubydeps
       end
     end
 
+    desc "", "Loads dependencies saved by a --to_file option in a previous run. Doesn't run tests"
+    method_option :from_file, :type => :string, :required => true
+    method_option :path_filter, :type => :string, :default => `pwd`.chomp, :required => true
+    method_option :class_name_filter, :type => :string, :default => '', :required => true
+    default_task :load_deps
+    def load_deps
+      puts options[:from_file]
+    end
+
     desc "rspec2", "Create the dependency graph after runnning the rspec 2 tests"
     method_option :to_file, :type => :string
-    method_option :from_file, :type => :string
     method_option :path_filter, :type => :string, :default => `pwd`.chomp, :required => true
     method_option :class_name_filter, :type => :string, :default => '', :required => true
     def rspec2
@@ -60,7 +66,7 @@ module Rubydeps
       end
     end
 
-    private 
+  private
 
     def create_dependencies_dot_for(options)
       ARGV.clear