tpl/urls: Add anchorize template func

tpl/urls/init.go

@@ -59,6 +59,13 @@ func init() {
 			[][2]string{},
 		)
 
+		ns.AddMethodMapping(ctx.Anchorize,
+			[]string{"anchorize"},
+			[][2]string{
+				{`{{ "This is a title" | anchorize }}`, `this-is-a-title`},
+			},
+		)
+
 		return ns
 
 	}

tpl/urls/urls.go

@@ -16,6 +16,9 @@ package urls
 import (
 	"errors"
 	"fmt"
+
+	"github.com/russross/blackfriday"
+
 	"html/template"
 	"net/url"
 
@@ -78,6 +81,15 @@ func (ns *Namespace) URLize(a interface{}) (string, error) {
 	return ns.deps.PathSpec.URLize(s), nil
 }
 
+// Anchorize creates sanitized anchor names that are compatible with Blackfriday.
+func (ns *Namespace) Anchorize(a interface{}) (string, error) {
+	s, err := cast.ToStringE(a)
+	if err != nil {
+		return "", nil
+	}
+	return blackfriday.SanitizedAnchorName(s), nil
+}
+
 type reflinker interface {
 	Ref(refs ...string) (string, error)
 	RelRef(refs ...string) (string, error)