Add enable_on_routes and disable_on_routes config options

Example usage:

enable_on_routes:
  - '/blog'

disable_on_routes:
  - /blog/blog-post-to-ignore
  - /ignore-this-route
  #- '/blog/daring-fireball-link'

comments.php

@@ -15,6 +15,7 @@ use Symfony\Component\Yaml\Yaml;
 class CommentsPlugin extends Plugin
 {
     protected $route = 'comments';
+    protected $enable = false;
 
     /**
      * @return array
@@ -51,9 +52,45 @@ class CommentsPlugin extends Plugin
 
     public function onTwigSiteVariables() {
         if (!$this->isAdmin()) {
+            $this->grav['twig']->enable = $this->enable;
+
+            if ($this->enable) {
                 $this->grav['twig']->comments = $this->fetchComments();
             }
         }
+    }
+
+    /**
+     * Determine if $haystack starts with $needle. Credit: http://stackoverflow.com/a/10473026/205039
+     */
+    private function startsWith($haystack, $needle) {
+        return $needle === "" || strrpos($haystack, $needle, -strlen($haystack)) !== FALSE;
+    }
+
+    /**
+     * Determine if the plugin should be enabled based on the enable_on_routes and disable_on_routes config options
+     */
+    private function calculateEnable() {
+        $uri = $this->grav['uri'];
+
+        $disable_on_routes = (array) $this->config->get('plugins.comments.disable_on_routes');
+        $enable_on_routes = (array) $this->config->get('plugins.comments.enable_on_routes');
+
+        $path = $uri->path();
+
+        if (!in_array($path, $disable_on_routes)) {
+            if (in_array($path, $enable_on_routes)) {
+                $this->enable = true;
+            } else {
+                foreach($enable_on_routes as $route) {
+                    if ($this->startsWith($path, $route)) {
+                        $this->enable = true;
+                        break;
+                    }
+                }
+            }
+        }
+    }
 
     /**
      */
@@ -61,6 +98,8 @@ class CommentsPlugin extends Plugin
     {
         if (!$this->isAdmin()) {
 
+            $this->calculateEnable();
+
             $this->enable([
                 'onTwigTemplatePaths' => ['onTwigTemplatePaths', 0],
             ]);
@@ -118,6 +157,7 @@ class CommentsPlugin extends Plugin
                 $name = filter_var(urldecode($post['name']), FILTER_SANITIZE_STRING);
                 $email = filter_var(urldecode($post['email']), FILTER_SANITIZE_STRING);
                 $title = filter_var(urldecode($post['title']), FILTER_SANITIZE_STRING);
+
                 /** @var Language $language */
                 $language = $this->grav['language'];
                 $lang = $language->getLanguage();

comments.yaml

@@ -1,4 +1,13 @@
 enabled: true
+
+enable_on_routes:
+  - '/blog'
+
+disable_on_routes:
+  - /blog/blog-post-to-ignore
+  - /ignore-this-route
+  #- '/blog/daring-fireball-link'
+
 form:
     name: comments
     fields:
@@ -45,7 +54,7 @@ form:
         # - name: g-recaptcha-response
         #   label: Captcha
         #   type: captcha
-        #   recatpcha_site_key: 6Lde4gwTAAAAAAZuv4z2AgVU6Xamn5twDYzQr8hv
+        #   recatpcha_site_key: e32iojeoi32jeoi32jeoij32oiej32oiej3
         #   recaptcha_not_validated: 'Captcha not valid!'
         #   validate:
         #     required: true
@@ -61,7 +70,7 @@ form:
         #     subject: "[Site Guestbook] {{ form.value.name|e }}"
         #     body: "{% include 'forms/data.html.twig' %}"
         # - captcha:
-        #     recatpcha_secret: 6Lde4gwTAAAAAPpwVKuaYm53n2bWfFfxcDxSlI54
+        #     recatpcha_secret: ej32oiej23oiej32oijeoi32jeio32je
         - addComment:
         - message: Thank you for writing your comment!
 

templates/partials/comments.html.twig

@@ -1,3 +1,5 @@
+{% if grav.twig.enable %}
+
     <h3>{{'PLUGIN_COMMENTS.ADD_COMMENT'|t}}</h3>
 
     <form name="{{ grav.config.plugins.comments.form.name }}"
@@ -39,3 +41,4 @@
             {% endfor %}
         </table>
     {% endif %}
+{% endif %}