Provide a copy button for link examples (#222)

Use a more modern page layout with jelly instead of groovy layout.  Provide a copy button rather than using a borderless input field to provide easy copy and paste.  The copy button is used in multiple places in Jenkins.

Fix Bitbucket URL link error (Had unbalanced parentheses)

Add Asciidoc examples

Fixes #59

src/main/java/org/jenkinsci/plugins/badge/actions/JobBadgeAction.java

@@ -8,10 +8,14 @@
 import hudson.model.Action;
 import hudson.model.Job;
 import hudson.model.Run;
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
 import org.jenkins.ui.icon.IconSpec;
 import org.jenkinsci.plugins.badge.*;
 import org.kohsuke.stapler.HttpResponse;
 import org.kohsuke.stapler.QueryParameter;
+import org.kohsuke.stapler.Stapler;
+import org.kohsuke.stapler.StaplerRequest;
 import org.kohsuke.stapler.WebMethod;
 
 /**
@@ -45,6 +49,31 @@ public String getUrlName() {
         return "badge";
     }
 
+    public String getUrl() {
+        /* Needed for the jelly syntax hints page */
+        String url = "";
+        StaplerRequest req = Stapler.getCurrentRequest();
+        if (req != null) {
+            url = req.getReferer();
+            if (url == null) {
+                url = "null-referer";
+            }
+        }
+        return url;
+    }
+
+    public String getUrlEncodedFullName() {
+        /* Needed for the jelly syntax hints page */
+        if (project == null) {
+            return "null-project-no-url-encoded-fullName";
+        }
+        if (project.getFullName() == null) {
+            return "null-project-fullName-no-url-encoded-fullName";
+        }
+        String fullName = URLEncoder.encode(project.getFullName(), StandardCharsets.UTF_8);
+        return fullName == null ? "null-url-encoded-fullName" : fullName;
+    }
+
     @WebMethod(name = "icon")
     public HttpResponse doIcon(
             @QueryParameter String build,

src/main/java/org/jenkinsci/plugins/badge/actions/RunBadgeAction.java

@@ -7,10 +7,13 @@
 import hudson.model.Action;
 import hudson.model.Job;
 import hudson.model.Run;
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
 import org.jenkins.ui.icon.IconSpec;
 import org.jenkinsci.plugins.badge.*;
 import org.kohsuke.stapler.HttpResponse;
 import org.kohsuke.stapler.QueryParameter;
+import org.kohsuke.stapler.Stapler;
 import org.kohsuke.stapler.WebMethod;
 
 public class RunBadgeAction implements Action, IconSpec {
@@ -42,6 +45,26 @@ public String getUrlName() {
         return "badge";
     }
 
+    public String getUrl() {
+        /* TODO: Is a permission check needed here? */
+        /* Needed for the jelly syntax hints page */
+        String url = Stapler.getCurrentRequest().getReferer();
+        return url == null ? "null-referer" : url;
+    }
+
+    public String getUrlEncodedFullName() {
+        /* TODO: Is a permission check needed here? */
+        /* Needed for the jelly syntax hints page */
+        if (project == null) {
+            return "null-project-no-url-encoded-fullName";
+        }
+        if (project.getFullName() == null) {
+            return "null-project-fullName-no-url-encoded-fullName";
+        }
+        String fullName = URLEncoder.encode(project.getFullName(), StandardCharsets.UTF_8);
+        return fullName == null ? "null-url-encoded-fullName" : fullName;
+    }
+
     @WebMethod(name = "icon")
     public HttpResponse doIcon(
             @QueryParameter String style,