Add plainify template function

docs/content/templates/functions.md

@@ -448,6 +448,12 @@ Runs the string through the Markdown processor. The result will be declared as "
 
 e.g. `{{ .Title | markdownify }}`
 
+### plainify
+
+Strips any HTML and returns the plain text version.
+
+e.g. `{{ "<b>BatMan</b>" | plainify }}` → "BatMan"
+
 ### pluralize
 Pluralize the given word with a set of common English pluralization rules.
 

tpl/template_funcs.go

@@ -1168,9 +1168,21 @@ func emojify(in interface{}) (template.HTML, error) {
 	if err != nil {
 		return "", err
 	}
+
 	return template.HTML(helpers.Emojify([]byte(str))), nil
 }
 
+// plainify strips any HTML and returns the plain text version.
+func plainify(in interface{}) (string, error) {
+	s, err := cast.ToStringE(in)
+
+	if err != nil {
+		return "", err
+	}
+
+	return helpers.StripHTML(s), nil
+}
+
 func refPage(page interface{}, ref, methodName string) template.HTML {
 	value := reflect.ValueOf(page)
 
@@ -1757,6 +1769,7 @@ func init() {
 		"mul":          func(a, b interface{}) (interface{}, error) { return doArithmetic(a, b, '*') },
 		"ne":           ne,
 		"partial":      partial,
+		"plainify":     plainify,
 		"pluralize":    pluralize,
 		"readDir":      readDir,
 		"ref":          ref,

tpl/template_funcs_test.go

@@ -102,6 +102,7 @@ delimit: {{ delimit (slice "A" "B" "C") ", " " and " }}
 jsonify: {{ (slice "A" "B" "C") | jsonify }}
 md5: {{ md5 "Hello world, gophers!" }}
 sha1: {{ sha1 "Hello world, gophers!" }}
+plainify: {{ plainify  "Hello <strong>world</strong>, gophers!" }}
 `
 	expected := `chomp: <p>Blockhead</p>
 dateFormat: Wednesday, Jan 21, 2015
@@ -139,6 +140,7 @@ delimit: A, B and C
 jsonify: ["A","B","C"]
 md5: b3029f756f98f79e7f1b7f1d1f0dd53b
 sha1: c8b5b0e33d408246e30f53e32b8f7627a7a649d4
+plainify: Hello world, gophers!
 `
 
 	var b bytes.Buffer