Fix case issue Viper vs Blackfriday config

There are still work to be done in the case department, but that will have to be another day.

Fixes #2581
See https://github.com/spf13/viper/issues/261

helpers/content.go

@@ -27,7 +27,6 @@ import (
 	"github.com/miekg/mmark"
 	"github.com/mitchellh/mapstructure"
 	"github.com/russross/blackfriday"
-	"github.com/spf13/cast"
 	bp "github.com/spf13/hugo/bufferpool"
 	jww "github.com/spf13/jwalterweatherman"
 	"github.com/spf13/viper"
@@ -60,7 +59,8 @@ type Blackfriday struct {
 
 // NewBlackfriday creates a new Blackfriday filled with site config or some sane defaults.
 func NewBlackfriday(c ConfigProvider) *Blackfriday {
-	combinedParam := map[string]interface{}{
+
+	defaultParam := map[string]interface{}{
 		"smartypants":                      true,
 		"angledQuotes":                     false,
 		"fractions":                        true,
@@ -73,17 +73,24 @@ func NewBlackfriday(c ConfigProvider) *Blackfriday {
 		"sourceRelativeLinksProjectFolder": "/docs/content",
 	}
 
-	siteParam := c.GetStringMap("blackfriday")
-	if siteParam != nil {
-		siteConfig := cast.ToStringMap(siteParam)
+	ToLowerMap(defaultParam)
 
-		for key, value := range siteConfig {
-			combinedParam[key] = value
+	siteParam := c.GetStringMap("blackfriday")
+
+	siteConfig := make(map[string]interface{})
+
+	for k, v := range defaultParam {
+		siteConfig[k] = v
+	}
+
+	if siteParam != nil {
+		for k, v := range siteParam {
+			siteConfig[k] = v
 		}
 	}
 
 	combinedConfig := &Blackfriday{}
-	if err := mapstructure.Decode(combinedParam, combinedConfig); err != nil {
+	if err := mapstructure.Decode(siteConfig, combinedConfig); err != nil {
 		jww.FATAL.Printf("Failed to get site rendering config\n%s", err.Error())
 	}
 

helpers/general.go

@@ -119,6 +119,29 @@ func ReaderToBytes(lines io.Reader) []byte {
 	return bc
 }
 
+// ToLowerMap makes all the keys in the given map lower cased and will do so
+// recursively.
+// Notes:
+// * This will modify the map given.
+// * Any nested map[interface{}]interface{} will be converted to map[string]interface{}.
+func ToLowerMap(m map[string]interface{}) {
+	for k, v := range m {
+		switch v.(type) {
+		case map[interface{}]interface{}:
+			v = cast.ToStringMap(v)
+			ToLowerMap(v.(map[string]interface{}))
+		case map[string]interface{}:
+			ToLowerMap(v.(map[string]interface{}))
+		}
+
+		lKey := strings.ToLower(k)
+		if k != lKey {
+			delete(m, k)
+		}
+		m[lKey] = v
+	}
+}
+
 // ReaderToString is the same as ReaderToBytes, but returns a string.
 func ReaderToString(lines io.Reader) string {
 	if lines == nil {

helpers/general_test.go

@@ -291,3 +291,56 @@ func TestDoArithmetic(t *testing.T) {
 		}
 	}
 }
+
+func TestToLowerMap(t *testing.T) {
+
+	tests := []struct {
+		input    map[string]interface{}
+		expected map[string]interface{}
+	}{
+		{
+			map[string]interface{}{
+				"abC": 32,
+			},
+			map[string]interface{}{
+				"abc": 32,
+			},
+		},
+		{
+			map[string]interface{}{
+				"abC": 32,
+				"deF": map[interface{}]interface{}{
+					23: "A value",
+					24: map[string]interface{}{
+						"AbCDe": "A value",
+						"eFgHi": "Another value",
+					},
+				},
+				"gHi": map[string]interface{}{
+					"J": 25,
+				},
+			},
+			map[string]interface{}{
+				"abc": 32,
+				"def": map[string]interface{}{
+					"23": "A value",
+					"24": map[string]interface{}{
+						"abcde": "A value",
+						"efghi": "Another value",
+					},
+				},
+				"ghi": map[string]interface{}{
+					"j": 25,
+				},
+			},
+		},
+	}
+
+	for i, test := range tests {
+		// ToLowerMap modifies input.
+		ToLowerMap(test.input)
+		if !reflect.DeepEqual(test.expected, test.input) {
+			t.Errorf("[%d] Expected\n%#v, got\n%#v\n", i, test.expected, test.input)
+		}
+	}
+}