Add an unified .Site.Config with a services section

Fixes #4751

config/services/servicesConfig_test.go

@@ -0,0 +1,64 @@
+// Copyright 2018 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package services
+
+import (
+	"testing"
+
+	"github.com/gohugoio/hugo/config"
+	"github.com/spf13/viper"
+	"github.com/stretchr/testify/require"
+)
+
+func TestDecodeConfigFromTOML(t *testing.T) {
+	assert := require.New(t)
+
+	tomlConfig := `
+
+someOtherValue = "foo"
+
+[services]
+[services.disqus]
+shortname = "DS"
+[services.googleAnalytics]
+id = "ga_id"
+`
+	cfg, err := config.FromConfigString(tomlConfig, "toml")
+	assert.NoError(err)
+
+	config, err := DecodeConfig(cfg)
+	assert.NoError(err)
+	assert.NotNil(config)
+
+	assert.Equal("DS", config.Disqus.Shortname)
+	assert.Equal("ga_id", config.GoogleAnalytics.ID)
+
+}
+
+// Support old root-level GA settings etc.
+func TestUseSettingsFromRootIfSet(t *testing.T) {
+	assert := require.New(t)
+
+	cfg := viper.New()
+	cfg.Set("disqusShortname", "root_short")
+	cfg.Set("googleAnalytics", "ga_root")
+
+	config, err := DecodeConfig(cfg)
+	assert.NoError(err)
+	assert.NotNil(config)
+
+	assert.Equal("root_short", config.Disqus.Shortname)
+	assert.Equal("ga_root", config.GoogleAnalytics.ID)
+
+}