add support for elixir

SPEC.md

@@ -333,6 +333,13 @@ Alias for [`deploy[].on.ruby`](#deployonruby).
 #### `dist`
 **Expected format:** String.
 
+#### `elixir`
+**This setting is only relevant if [`language`](#language) is set to `elixir`**
+
+List of `elixir` version to use.
+
+**Expected format:** List of strings; or a single string.
+
 #### `env`
 **Expected format:** Key value mapping, or list of strings or encrypted strings.
 
@@ -407,7 +414,7 @@ List of `jdk` versions to use.
 #### `language`
 **This setting is required!**
 
-Value has to be `c`, `cpp`, `clojure`, `d`, `dart`, `erlang`, `go`, `groovy`, `haskell`, `haxe`, `java`, `node_js`, `objective-c`, `ruby` (default), `rust`, `python`, `perl`, `php`, `scala`, `android`, `crystal`, `csharp`, `smalltalk` or `generic`; or one of the known aliases: `dartlang` for `dart`, `jvm` for `java`, `javascript` for `node_js`, `node` for `node_js`, `nodejs` for `node_js`, `golang` for `go`, `objective_c` for `objective-c`, `obj_c` for `objective-c`, `objc` for `objective-c`, `c++` for `cpp`, `node.js` for `node_js`, `obj-c` for `objective-c`, `bash` for `generic`, `sh` for `generic` or `shell` for `generic`. Setting is not case sensitive.
+Value has to be `c`, `cpp`, `clojure`, `d`, `dart`, `elixir`, `erlang`, `go`, `groovy`, `haskell`, `haxe`, `java`, `node_js`, `objective-c`, `ruby` (default), `rust`, `python`, `perl`, `php`, `scala`, `android`, `crystal`, `csharp`, `smalltalk` or `generic`; or one of the known aliases: `dartlang` for `dart`, `jvm` for `java`, `javascript` for `node_js`, `node` for `node_js`, `nodejs` for `node_js`, `golang` for `go`, `objective_c` for `objective-c`, `obj_c` for `objective-c`, `objc` for `objective-c`, `c++` for `cpp`, `node.js` for `node_js`, `obj-c` for `objective-c`, `bash` for `generic`, `sh` for `generic` or `shell` for `generic`. Setting is not case sensitive.
 
 **Expected format:** String.
 
@@ -455,6 +462,13 @@ Value has to be `gcc` (default) or `clang`; or one of the known aliases: `g++` f
 
 **Expected format:** String.
 
+#### `matrix.exclude[].elixir`
+**This setting is only relevant if [`language`](#language) is set to `elixir`**
+
+`elixir` version to use.
+
+**Expected format:** String.
+
 #### `matrix.allow_failures[].env`
 **Expected format:** String or encrypted string.
 
@@ -770,6 +784,13 @@ Value has to be `gcc` (default) or `clang`; or one of the known aliases: `g++` f
 
 **Expected format:** String.
 
+#### `matrix.include[].elixir`
+**This setting is only relevant if [`language`](#language) is set to `elixir`**
+
+`elixir` version to use.
+
+**Expected format:** String.
+
 #### `matrix.include[].env`
 **Expected format:** String or encrypted string.
 
@@ -1231,7 +1252,7 @@ Value has to be `linux` (default) or `osx`; or one of the known aliases: `ubuntu
 Alias for [`otp_release`](#otp_release).
 
 #### `otp_release`
-**This setting is only relevant if [`language`](#language) is set to `erlang`.**
+**This setting is only relevant if [`language`](#language) is set to `erlang` or `elixir`.**
 
 List of `otp_release` versions to use.
 

lib/travis/yaml/matrix.rb

@@ -3,7 +3,7 @@
 module Travis::Yaml
   class Matrix < DelegateClass(Array)
     EXPAND_KEYS = [
-      :compiler, :crystal, :d, :dart, :gemfile, :ghc, :go, :haxe, :jdk, :lein,
+      :compiler, :crystal, :d, :dart, :elixir, :gemfile, :ghc, :go, :haxe, :jdk, :lein,
       :node_js, :otp_release, :perl, :php, :python, :ruby, :scala, :xcode_scheme,
       :xcode_sdk, :os , :smalltalk
     ]

lib/travis/yaml/nodes/language.rb

@@ -4,8 +4,8 @@ class Language < FixedValue
       ignore_case
       default :ruby
 
-      value :c, :cpp, :clojure, :d, :dart, :erlang, :go, :groovy, :haskell, :haxe, :java,
-            :node_js, :"objective-c", :ruby, :rust, :python, :perl, :php, :scala,
+      value :c, :cpp, :clojure, :d, :dart, :elixir, :erlang, :go, :groovy, :haskell, :haxe,
+            :java, :node_js, :"objective-c", :ruby, :rust, :python, :perl, :php, :scala,
             :android, :crystal, :csharp, :smalltalk
       value dartlang: :dart, jvm: :java, javascript: :node_js, node: :node_js,
             nodejs: :node_js, golang: :go, objective_c: :"objective-c",

lib/travis/yaml/nodes/language_specific.rb

@@ -6,7 +6,8 @@ module LanguageSpecific
         compiler:         %w[c cpp],
         lein:             %w[clojure],
         dart:             %w[dart],
-        otp_release:      %w[erlang],
+        elixir:           %w[elixir],
+        otp_release:      %w[elixir erlang],
         gobuild_args:     %w[go],
         go:               %w[go],
         jdk:              %w[clojure groovy java ruby scala android],

lib/travis/yaml/nodes/matrix.rb

@@ -4,7 +4,7 @@ class Matrix < Mapping
       class Matcher < Mapping
         include LanguageSpecific
 
-        map :ruby, :jdk, :lein, :otp_release, :go, :ghc, :haxe, :node_js, :xcode_sdk,
+        map :ruby, :jdk, :lein, :elixir, :otp_release, :go, :ghc, :haxe, :node_js, :xcode_sdk,
           :xcode_scheme, :perl, :php, :python, :gemfile, :dart, :d, :crystal, :smalltalk, to: Version
         map :rvm, to: :ruby
         map :otp, to: :otp_release

lib/travis/yaml/nodes/root.rb

@@ -7,7 +7,7 @@ class Root < Mapping
       map :sudo, to: Scalar[:bool], required: false
       map :bundler_args, to: BundlerArgs
       map :deploy, :ruby, :os, :compiler, :git, :jdk, :virtualenv, :matrix, :env, :notifications, :branches, :cache, :addons, :android
-      map :lein, :otp_release, :go, :ghc, :haxe, :xcode_sdk, :xcode_scheme, :perl, :php, :python, :services, :gemfile,
+      map :lein, :elixir, :otp_release, :go, :ghc, :haxe, :xcode_sdk, :xcode_scheme, :perl, :php, :python, :services, :gemfile,
         :dart, :scala, :d, :crystal, :smalltalk, to: VersionList
       map :podfile, to: Version
       map :node_js, to: VersionList[/^((iojs)|(iojs\-v\d+\.\d+(\.\d+)?)|(\d+(\.\d+(\.\d+)?)?)|stable|node)$/]