feat(circleci): implement circle ci

Author: sanemat

README.md

@@ -25,6 +25,10 @@ env_pull.pull_request_id #=> 800
     * `ENV['TRAVIS_PULL_REQUEST']`
     * [Environment Variables - Travis CI](http://docs.travis-ci.com/user/environment-variables/#Convenience-Variables)
 
+* CircleCI
+    * `ENV['CIRCLE_PR_NUMBER']`
+    * [Environment variables - CircleCI](https://circleci.com/docs/environment-variables#building-pull-requests-that-come-from-forks)
+
 
 ## Changelog
 

lib/env_pull_request/base.rb

@@ -9,6 +9,8 @@ def initialize
     def fetch_pull_request_id
       if ENV['TRAVIS_PULL_REQUEST'] && ENV['TRAVIS_PULL_REQUEST'].downcase != 'false'
         ENV['TRAVIS_PULL_REQUEST'].to_i
+      elsif ENV['CIRCLE_PR_NUMBER']
+        ENV['CIRCLE_PR_NUMBER'].to_i
       end
     end
 

test/test_ci.rb

@@ -4,11 +4,14 @@ module EnvPullRequest
   class TestCi < Test::Unit::TestCase
     def self.startup
       @original_travis_pull_request = ENV['TRAVIS_PULL_REQUEST']
+      @original_circle_pr_number = ENV['CIRCLE_PR_NUMBER']
       ENV.delete 'TRAVIS_PULL_REQUEST'
+      ENV.delete 'CIRCLE_PR_NUMBER'
     end
 
     def self.shutdown
       ENV['TRAVIS_PULL_REQUEST'] = @original_travis_pull_request
+      ENV['CIRCLE_PR_NUMBER'] = @original_circle_pr_number
     end
 
     sub_test_case 'not pull request' do
@@ -45,5 +48,27 @@ def self.shutdown
         end
       end
     end
+
+    sub_test_case 'circle ci' do
+      pull_id = 800
+      setup do
+        ENV['CIRCLE_PR_NUMBER'] = pull_id.to_s
+      end
+
+      teardown do
+        ENV.delete 'CIRCLE_PR_NUMBER'
+      end
+
+      test '#pull_request?' do
+        assert do
+          EnvPullRequest.new.pull_request? == true
+        end
+      end
+      test '#pull_request_id' do
+        assert do
+          EnvPullRequest.new.pull_request_id == pull_id
+        end
+      end
+    end
   end
 end