Added gen_travis rake task, updated .travis.yml

.travis.yml

@@ -1,39 +1,37 @@
 language: ruby
 dist: trusty
-os:
-  - linux
-  - osx
-
-rvm:
-  - 1.8.7
-  - 1.9.3
-  - 2.0.0
-  - 2.1.10
-  - 2.2.8
-  - 2.3.8
-  - 2.4.6
-  - 2.5.5
-  - 2.6.3
-  - ruby-head
-
 matrix:
   fast_finish: true
-  allow_failures:
-    - rvm: ruby-head
-
-  exclude:
+  include:
+    - os: linux
+      rvm: 3.0.1
     - os: osx
-      rvm: 1.9.3
+      rvm: 3.0.1
+    - os: linux
+      rvm: 2.7.3
     - os: osx
-      rvm: 2.0.0
-
+      rvm: 2.7.3
+    - os: linux
+      rvm: 2.6.7
+    - os: osx
+      rvm: 2.6.7
+    - os: linux
+      rvm: 2.5.9
     - os: osx
+      rvm: 2.5.9
+    - os: linux
+      rvm: 2.4.10
+    - os: osx
+      rvm: 2.4.10
+    - os: linux
+      rvm: 2.3.8
+    - os: linux
+      rvm: 2.2.10
+    - os: linux
+      rvm: 2.1.10
+    - os: linux
+      rvm: 2.0.0
+    - os: linux
+      rvm: 1.9.3
+    - os: linux
       rvm: 1.8.7
-
-#  include:
-#    - os: osx
-#      rvm: 1.9.3
-#      before_script: rvm install ruby-1.9.3 # not binary
-#    - os: osx
-#      rvm: 2.0.0
-#      before_script: rvm install ruby-2.0.0 # not binary

Rakefile

@@ -39,4 +39,55 @@ task :changelog, :since_c, :until_c do |t,args|
   end
 
   puts changelog_content
+end
+
+desc "Generates travis.yaml"
+task :gen_travis do
+  versions = []
+
+  def versions.add(major:, minor:, include_macos: true)
+    self << { major: major, minor: [minor], include_macos: include_macos }
+  end
+
+  versions.add major: '3.0', minor: 1
+  versions.add major: '2.7', minor: 3
+  versions.add major: '2.6', minor: 7
+  versions.add major: '2.5', minor: 9
+  versions.add major: '2.4', minor: 10
+  versions.add major: '2.3', minor: 8, include_macos: false
+  versions.add major: '2.2', minor: 10, include_macos: false
+  versions.add major: '2.1', minor: 10, include_macos: false
+  versions.add major: '2.0', minor: 0, include_macos: false
+  versions.add major: '1.9', minor: 3, include_macos: false
+  versions.add major: '1.8', minor: 7, include_macos: false
+
+  puts <<EOM
+language: ruby
+dist: trusty
+matrix:
+  fast_finish: true
+  include:
+EOM
+
+  loop do
+    found_some = false
+
+    versions.each do |version|
+      minor = version[:minor].pop
+      if minor
+        found_some = true
+        full_version = "#{version[:major]}.#{minor}"
+        puts <<EOM
+    - os: linux
+      rvm: #{full_version}
+EOM
+        puts <<EOM if version[:include_macos]
+    - os: osx
+      rvm: #{full_version}
+EOM
+      end
+    end
+
+    break unless found_some
+  end
 end