Add Elm language support

lib/travis/build/addons/deploy/script.rb

@@ -9,6 +9,7 @@ class Script
           VERSIONED_RUNTIMES = %i(
             d
             dart
+            elm
             elixir
             ghc
             go

lib/travis/build/script.rb

@@ -29,6 +29,7 @@
 require 'travis/build/script/julia'
 require 'travis/build/script/nix'
 require 'travis/build/script/node_js'
+require 'travis/build/script/elm'
 require 'travis/build/script/objective_c'
 require 'travis/build/script/perl'
 require 'travis/build/script/perl6'

lib/travis/build/script/elm.rb

@@ -0,0 +1,183 @@
+module Travis
+  module Build
+    class Script
+      class Elm < NodeJs
+        # Default NodeJS version to install
+        DEFAULT_NODE_VERSION = '10.13.0'
+
+        DEFAULTS = {
+          elm: '0.19.0',
+          elm_test: '0.19.0',
+          elm_format: '0.19.0'
+        }
+
+        ELM_TEST_REQUIRED_NODE_VERSION = '6.0.0'
+
+        def export
+          super
+          sh.export 'TRAVIS_ELM_VERSION', elm_version, echo: false
+          sh.export 'TRAVIS_ELM_TEST_VERSION', elm_test_version, echo: false
+          sh.export 'TRAVIS_ELM_FORMAT_VERSION', elm_format_version, echo: false
+        end
+
+        def configure
+          super
+
+          config[:node_js] ||= DEFAULT_NODE_VERSION
+        end
+
+        def announce
+          super
+          sh.cmd 'elm --version', echo: true
+          sh.cmd 'elm-test --version', echo: true
+
+          # elm-format doesn't have --version,
+          # but the first line of `elm-format --help` prints the version
+          sh.cmd 'elm-format --help | head -n 1', echo: true
+        end
+
+        def setup
+          super
+
+          sh.echo 'Elm for Travis-CI is not officially supported, ' \
+          'but is community maintained.', ansi: :green
+          sh.echo 'Please file any issues using the following link',
+            ansi: :green
+          sh.echo '  https://github.com/travis-ci/travis-ci/issues' \
+            '/new?labels=community:elm', ansi: :green
+          sh.echo 'and mention \`@avh4\`, \`@lukewestby\`, \`@stoeffel\` and \`@rtfeldman\`' \
+            ' in the issue', ansi: :green
+
+
+          sh.if '! -d sysconfcpus/bin' do
+            install_sysconfcpus
+          end
+
+          sh.fold 'install.elm' do
+            install_elm
+            install_elm_test
+            install_elm_format
+          end
+        end
+
+        def script
+          sh.cmd 'elm-format --validate . && elm-test'
+        end
+
+        def setup_cache
+          if data.cache?(:elm)
+            sh.fold 'cache.elm' do
+              # Cache the ~/.elm directory.
+              directory_cache.add '$HOME/.cache/elm', '$HOME/.elm'
+
+              directory_cache.add '$HOME/.cache/elm-stuff', 'elm-stuff'
+
+              if elm_major_version == 0 && elm_minor_version <= 18
+                # In Elm 0.18, some put their tests in ./test instead of ./tests
+                directory_cache.add '$HOME/.cache/elm-test-stuff', 'test/elm-stuff'
+              end
+
+              # In Elm 0.18+, all tests live in tests/ by default
+              # (whereas previously tests/ was allowed, but so was test/)
+              directory_cache.add '$HOME/.cache/elm-tests-stuff', 'tests/elm-stuff'
+
+              # we build sysconfcpus from source, so cache the result
+              directory_cache.add '$HOME/.cache/sysconfcpus-cache', 'sysconfcpus'
+            end
+          end
+        end
+
+        def cache_slug
+          super << '-elm-' << elm_version
+        end
+
+        private
+
+          def elm_version
+            config[:elm].to_s
+          end
+
+          def elm_version_number(index)
+            elm_version.split(".")[index]
+          end
+
+          def elm_major_version
+            elm_version_number 0
+          end
+
+          def elm_minor_version
+            elm_version_number 1
+          end
+
+          def elm_patch_version
+            elm_version_number 2
+          end
+
+          def elm_test_version
+            config[:elm_test].to_s
+          end
+
+          def elm_format_version
+            config[:elm_format].to_s
+          end
+
+          def install_elm
+            npm_install "-g elm@elm-#{elm_version}"
+
+            convert_binary_to_sysconfcpus 'elm'
+
+            # Beginning with Elm 0.19, there's one `elm` binary and that's it.
+            # In that case, there won't be any files to convert here!
+            if elm_major_version == 0 && elm_minor_version <= 18
+              convert_binary_to_sysconfcpus 'elm-make'
+              convert_binary_to_sysconfcpus 'elm-package'
+              convert_binary_to_sysconfcpus 'elm-format'
+            end
+          end
+
+          def install_elm_format
+            npm_install "-g elm-format@elm-#{elm_format_version}"
+
+            convert_binary_to_sysconfcpus 'elm-format'
+          end
+
+          def install_elm_test
+              sh.if "$(vers2int $(echo `node --version` | tr -d 'v')) -lt $(vers2int #{ELM_TEST_REQUIRED_NODE_VERSION})" do
+                sh.echo "Node.js version $(node --version) does not meet requirement for elm-test." \
+                  " Please use Node.js #{ELM_TEST_REQUIRED_NODE_VERSION} or later.", ansi: :red
+              end
+              sh.else do
+                sh.if "-z \"$(command -v elm-test)\"" do
+                  npm_install "-g elm-test@#{elm_test_version}"
+
+                  convert_binary_to_sysconfcpus 'elm-test'
+                end
+              end
+          end
+
+          def convert_binary_to_sysconfcpus(binary_name)
+            # Wrap the binary in a call to sysconfcpus -n 2
+            # to work around https://github.com/travis-ci/travis-ci/issues/6656
+            sh.mv "$(npm config get prefix)/bin/#{binary_name}", "$(npm config get prefix)/bin/#{binary_name}-old"
+
+            # Use printf instead of echo here.
+            # see https://github.com/rtfeldman/node-elm-compiler/pull/50
+            sh.cmd ('printf "#\041/bin/bash\n\necho \"Running ' + binary_name + ' with sysconfcpus -n 2\"\n\n$TRAVIS_BUILD_DIR/sysconfcpus/bin/sysconfcpus -n 2 ' + binary_name + '-old \"\$@\"" > $(npm config get prefix)/bin/' + binary_name)
+            sh.chmod '+x', "$(npm config get prefix)/bin/#{binary_name}"
+          end
+
+          def install_sysconfcpus
+            sh.fold 'sysconfcpus' do
+              # this is a prerequisite for the convert_binary_to_sysconfcpus method
+              # which provides an epic build time improvement - see https://github.com/elm-lang/elm-compiler/issues/1473#issuecomment-245704142
+              sh.cmd 'git clone https://github.com/obmarg/libsysconfcpus.git', retry: true
+              sh.cd 'libsysconfcpus'
+              sh.cmd './configure --prefix=$TRAVIS_BUILD_DIR/sysconfcpus'
+              sh.cmd 'make && make install'
+              sh.cd '..'
+            end
+          end
+      end
+    end
+  end
+end

spec/build/script/elm_spec.rb

@@ -0,0 +1,44 @@
+require 'spec_helper'
+
+describe Travis::Build::Script::Elm, :sexp do
+  let(:data)   { payload_for(:push, :elm) }
+  let(:script) { described_class.new(data) }
+  subject      { script.sexp }
+  it           { store_example }
+
+  it_behaves_like 'compiled script' do
+    let(:code) { ['TRAVIS_LANGUAGE=elm'] }
+    let(:cmds) { ['elm-test'] }
+  end
+
+  it_behaves_like 'a build script sexp'
+
+  it 'sets TRAVIS_ELM_VERSION' do
+    should include_sexp [:export, ['TRAVIS_ELM_VERSION', Travis::Build::Script::Elm::DEFAULTS[:elm]]]
+  end
+
+  it 'sets TRAVIS_ELM_TEST_VERSION' do
+    should include_sexp [:export, ['TRAVIS_ELM_TEST_VERSION', Travis::Build::Script::Elm::DEFAULTS[:elm_test]]]
+  end
+
+  it 'sets TRAVIS_ELM_FORMAT_VERSION' do
+    should include_sexp [:export, ['TRAVIS_ELM_FORMAT_VERSION', Travis::Build::Script::Elm::DEFAULTS[:elm_format]]]
+  end
+
+  it 'announces elm version' do
+    should include_sexp [:cmd, 'elm --version', echo: true]
+    should include_sexp [:cmd, 'elm-test --version', echo: true]
+    should include_sexp [:cmd, 'elm-format --help | head -n 1', echo: true]
+  end
+
+  describe 'script' do
+    it 'runs `elm-test` and `elm-format`' do
+      should include_sexp [:cmd, 'elm-format --validate . && elm-test', echo: true, timing: true]
+    end
+  end
+
+  describe '#cache_slug' do
+    subject { described_class.new(data).cache_slug }
+    it { is_expected.to eq("cache-#{CACHE_SLUG_EXTRAS}--node--elm-#{Travis::Build::Script::Elm::DEFAULTS[:elm]}") }
+  end
+end