SHOW_ONLY feature copied from the original rails_rcov plugin, see ht…

…tp://svn.codahale.com/rails_rcov

Signed-off-by: commondream <alan@gnoso.com>

README.markdown

@@ -10,6 +10,21 @@ This is a simple rails plugin that adds some useful rcov tasks.
 
 The task ends up creating a coverage folder with an html coverage report in it.
 
+SHOW_ONLY is a comma-separated list of the files you'd like to see (although
+you can only run functionals, you still see all the models and helpers which 
+are 'touched'). Right now there are four types of files rake test:coverage 
+recognizes: models, helpers, controllers, and lib. These can be abbreviated 
+to their first letters:
+
+  # only show files from app/models
+  rake test:coverage SHOW_ONLY=models
+
+  # only show files from app/helpers and app/controllers
+  rake test:coverage SHOW_ONLY=helpers,controllers
+
+  # only show files from app/helpers and app/controllers, with less typing
+  rake test:coverage SHOW_ONLY=h,c
+
 Requirements
 ============
 

tasks/rcov.rake

@@ -15,6 +15,29 @@ def run_coverage(files)
   else
     exclude = '--exclude "rubygems/*"'
   end
+  # rake test:units:rcov SHOW_ONLY=models,controllers,lib,helpers
+  # rake test:units:rcov SHOW_ONLY=m,c,l,h
+  if ENV['SHOW_ONLY']
+    params = String.new
+    show_only = ENV['SHOW_ONLY'].to_s.split(',').map{|x|x.strip}
+    if show_only.any?
+      reg_exp = []
+      for show_type in show_only
+        reg_exp << case show_type
+        when 'm', 'models' : 'app\/models'
+        when 'c', 'controllers' : 'app\/controllers'
+        when 'h', 'helpers' : 'app\/helpers'
+        when 'l', 'lib' : 'lib'
+        else
+          show_type
+        end
+      end
+      reg_exp.map!{ |m| "(#{m})" }
+      params << " --exclude \"^(?!#{reg_exp.join('|')})\""
+    end
+    exclude = exclude + params
+  end
+
 
   rcov = "rcov --rails -Ilib:test --sort coverage --text-report #{exclude} --no-validator-links"
   puts