[FEATURE] uniq option added

README.md

@@ -95,6 +95,7 @@ notification: false    # Display notification after the specs are done running,
 run_all: { cmd: 'custom rspec command', message: 'custom message' } # Custom options to use when running all specs
 title: 'My project'    # Display a custom title for the notification, default: 'RSpec results'
 chdir: 'directory'     # run rspec from within a given subdirectory (useful if project has separate specs for submodules)
+uniq: true             # run specs only if they are different with previous saved version
 results_file: 'some/path' # use the given file for storing results (instead of default relative path)
 ```
 

lib/guard/rspec/options.rb

@@ -11,6 +11,7 @@ module Options
         cmd_additional_args: nil,
         launchy:         nil,
         notification:    true,
+        uniq:            false,
         title:           "RSpec results"
       }
 

lib/guard/rspec/runner.rb

@@ -5,6 +5,7 @@
 require "guard/rspec/notifier"
 require "guard/rspec/results"
 require "guard/rspec/rspec_process"
+require "digest/md5"
 
 module Guard
   class RSpec < Plugin
@@ -24,6 +25,7 @@ def initialize(options = {})
         @options = options
         @inspector = Inspectors::Factory.create(@options)
         @notifier = Notifier.new(@options)
+        @last_run_md5 = ""
       end
 
       def run_all
@@ -36,7 +38,7 @@ def run_all
 
       def run(paths)
         paths = inspector.paths(paths)
-        return true if paths.empty?
+        return true if paths.empty? || uniqueness_flag?(paths)
         Compat::UI.info("Running: #{paths.join(' ')}", reset: true)
         _run(paths, options) do |all_green|
           next false unless all_green
@@ -51,6 +53,25 @@ def reload
 
       private
 
+      def uniqueness_flag?(paths)
+        if @options[:uniq]
+          current_specs_md5 = get_last_specs_md5 paths
+          return true if current_specs_md5 == @last_run_md5
+          @last_run_md5 = current_specs_md5
+        end
+        false
+      end
+
+      def get_last_specs_md5(paths)
+        buffer = []
+        paths.each do |f|
+          next if File.directory? f
+          buffer << f
+          buffer << File.readlines(f)
+        end
+        Digest::MD5.digest buffer.join("\n")
+      end
+
       def _run(paths, options, &block)
         fail NoCmdOptionError unless options[:cmd]
         command = Command.new(paths, options)

lib/guard/rspec/version.rb

@@ -1,5 +1,5 @@
 module Guard
   module RSpecVersion
-    VERSION = "4.6.4"
+    VERSION = "4.6.5"
   end
 end