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Add shortcut to Scratch from shortcode

--- a/docs/content/extras/scratch.md

+++ b/docs/content/extras/scratch.md

@@ -40,6 +40,5 @@

 ```

 **Note:** The examples above uses the special `$` variable, which refers to the top-level node. This is the behavior you most likely want, and will help remove some confusion when using `Scratch` inside page range loops -- and you start inadvertently calling the wrong `Scratch`. But there may be use cases for `{{ .Scratch.Add "key" "some value" }}`.

-**Note:** To use `Scratch` in a `shortcode`, you will have to use the shortcode's Page's `Scratch`:  `{{ .Page.Scratch.Add "a1" 12 }}` or `{{ $.Page.Scratch.Add "a1" 12 }}`.

--- a/hugolib/shortcode.go

+++ b/hugolib/shortcode.go

@@ -42,6 +42,10 @@

 	return scp.Page.RelRef(ref)

 }

+func (scp *ShortcodeWithPage) Scratch() *Scratch {

+	return scp.Page.Scratch()

+}

+

 func (scp *ShortcodeWithPage) Get(key interface{}) interface{} {

 	if reflect.ValueOf(scp.Params).Len() == 0 {

 		return nil