Add parameter to display a text instead of the e-mail address

- See issue #1.
- Credits goes to @chris-79 for the idea.

README.md

@@ -25,10 +25,20 @@ This is not a standalone theme. It is a [Hugo](https://gohugo.io) theme componen
     ```go
     {{< cloakemail address="john.doe@example.com" >}}
     ```
-    or, if you want to specify a protocol and/or a class,
+4. You may specify a protocol, this way:
     ```go
-    {{< cloakemail address="john.doe@example.com" protocol="xmpp" class="vip" >}}
+    {{< cloakemail address="john.doe@example.com" protocol="xmpp" >}}
     ```
+5. or a class, this way:
+    ```go
+    {{< cloakemail address="john.doe@example.com" class="vip" >}}
+    ```
+6. or a text to be display instead of the e-mail address, this way:
+    ```go
+    {{< cloakemail address="john.doe@example.com" display="Send us a mail!" >}}
+    ```
+
+All parameters can be combined.
 
 ### Credits
 

layouts/shortcodes/cloakemail.html

@@ -2,6 +2,7 @@
 {{- $address := .Get "address" | default (.Get 0) -}}
 {{- $protocol := .Get "protocol" | default "mailto" -}}
 {{- $class := .Get "class" -}}
+{{- $displaytext := .Get "display" -}}
 {{- $parts := split $address "@" -}}
 {{- $user := (index $parts 0) -}}
 {{- $domain := (index $parts 1) -}}
@@ -20,7 +21,11 @@
   var link = document.createElement("a");
   var address = "{{ range $index := seq (sub (len $user) 1) 0}}{{ substr $user $index 1}}{{ end }}".split('').reverse().join('') + "@" + "{{ range $index := seq (sub (len $domain) 1) 0}}{{ substr $domain $index 1}}{{ end }}".split('').reverse().join('');
   link.href = {{ $protocol }} + ":" + address;
+  {{ with $displaytext }}
+  link.innerText = {{ $displaytext }};
+  {{ else }}
   link.innerText = address;
+  {{ end }}
   {{ with $class }}
   link.className = "{{ $class }}";
   {{ end }}