add items cmd to dump tags per item

lib/tag/runner.rb

@@ -50,5 +50,10 @@ def tree(options={})
     def models
       puts Tag::Store.models
     end
+
+    desc 'list all items with their tags'
+    def items
+      puts Tag.store.items
+    end
   end
 end

lib/tag/store.rb

@@ -64,5 +64,15 @@ def delete_tags(*tags)
       tags.each {|tag| @hash.delete(tag) }
       save
     end
+
+    def items
+      @hash.each_with_object({}) do |(tag,items),acc|
+        items.each do |item|
+          (acc[item] ||= []) << tag
+        end
+      end.sort_by {|e| e[0] }.map do |k,v|
+        "#{k}\t#{v.uniq.join(', ')}"
+      end
+    end
   end
 end

spec/helper.rb

@@ -1,5 +1,6 @@
 gem 'minitest' unless ENV['NO_RUBYGEMS']
 require 'minitest/spec'
+require 'minitest/autorun' unless $0.end_with?('/m')
 require 'tag'
 require 'fileutils'
 require 'bahia'

spec/runner_spec.rb

@@ -119,4 +119,11 @@ def tagged(tag)
     tag 'models'
     stdout.split("\n").must_equal ['default', 'physicist']
   end
+
+  it "items prints items with tags" do
+    tag 'add feynman -t funny'
+    tag 'add einstein -t bighead,postal'
+    tag 'items'
+    stdout.split("\n").must_equal ["einstein\tbighead, postal", "feynman\tfunny"]
+  end
 end