Move getStringArray -> frontmatter.StringArray

frontmatter/frontmatter.go

@@ -43,6 +43,25 @@ func (fm FrontMatter) String(k string, defaultValue string) string {
 	return defaultValue
 }
 
+// StringArray returns m[k] if it's a []string or string array
+func (fm FrontMatter) StringArray(k string) []string {
+	if value, ok := fm[k]; ok {
+		switch value := value.(type) {
+		case []string:
+			return value
+		case []interface{}:
+			a := make([]string, len(value))
+			for i, item := range value {
+				a[i] = fmt.Sprintf("%s", item)
+			}
+			return a
+		case string:
+			return []string{value}
+		}
+	}
+	return nil
+}
+
 // SortedStringArray returns a sorts list of strings from a
 // frontmatter variable that is either a string (in which case it
 // is a ws-separated list of words), or a list of strings.

plugins/redirect_from.go

@@ -2,7 +2,6 @@ package plugins
 
 import (
 	"bytes"
-	"fmt"
 	"text/template"
 )
 
@@ -47,11 +46,7 @@ func (p jekyllRedirectFromPlugin) processRedirectFrom(s Site, ps []Page) (func()
 		redirects = append(redirects, f)
 	}
 	for _, p := range ps {
-		sources, err := getStringArray(p, "redirect_from")
-		if err != nil {
-			return nil, err
-		}
-		for _, from := range sources {
+		for _, from := range p.FrontMatter().StringArray("redirect_from") {
 			addRedirectFrom(from, p)
 		}
 	}
@@ -64,10 +59,7 @@ func (p jekyllRedirectFromPlugin) processRedirectFrom(s Site, ps []Page) (func()
 
 func (p jekyllRedirectFromPlugin) processRedirectTo(_ Site, ps []Page) error {
 	for _, p := range ps {
-		sources, err := getStringArray(p, "redirect_to")
-		if err != nil {
-			return err
-		}
+		sources := p.FrontMatter().StringArray("redirect_to")
 		if len(sources) > 0 {
 			p.SetContent(createRedirectionHTML(sources[0]))
 		}
@@ -75,26 +67,6 @@ func (p jekyllRedirectFromPlugin) processRedirectTo(_ Site, ps []Page) error {
 	return nil
 }
 
-func getStringArray(p Page, fieldName string) ([]string, error) {
-	var a []string
-	if value, ok := p.FrontMatter()[fieldName]; ok {
-		switch value := value.(type) {
-		case []string:
-			a = value
-		case []interface{}:
-			a = make([]string, len(value))
-			for i, item := range value {
-				a[i] = fmt.Sprintf("%s", item)
-			}
-		case string:
-			a = []string{value}
-		default:
-			return nil, fmt.Errorf("unimplemented redirect_from type %T", value)
-		}
-	}
-	return a, nil
-}
-
 func createRedirectionHTML(to string) string {
 	r := redirection{to}
 	buf := new(bytes.Buffer)