isso plugin: todo

Done: won't work because of isso-comments/isso#27
Waiting for an eventual fix.

plugins/isso/config.php.dist

@@ -0,0 +1,3 @@
+<?php
+
+$GLOBALS['plugins']['ISSO_SERVER'] = '';

plugins/isso/isso.html

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+<script data-isso="//%s/"
+        data-isso-css="true"
+        data-isso-lang="fr"
+        data-isso-reply-to-self="true"
+        data-isso-max-comments-top="20"
+        data-isso-max-comments-nested="5"
+        data-isso-reveal-on-click="5"
+        data-isso-avatar="true"
+        data-isso-avatar-bg="#f0f0f0"
+        data-isso-avatar-fg="#9abf88 #5698c4 #e279a3 #9163b6 ..."
+        data-isso-vote="true" 
+        data-isso-id="%s"
+        src="//%s/js/embed.min.js">
+</script>
+<section id="isso-thread"></section>
+

plugins/isso/isso.php

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+<?php
+
+// don't raise unnecessary warnings
+if (is_file(PluginManager::$PLUGINS_PATH . '/isso/config.php')) {
+    include PluginManager::$PLUGINS_PATH . '/isso/config.php';
+}
+
+if (!isset($GLOBALS['plugins']['ISSO_SERVER'])) {
+    header('Content-Type: text/plain; charset=utf-8');
+    echo 'Isso plugin error: '. PHP_EOL;
+    echo '  Please copy "plugins/isso/config.php.dist" to config.php and configure your isso server URL.'. PHP_EOL;
+    echo '  You can also define "$GLOBALS[\'plugins\'][\'ISSO_SERVER\']" in your global Shaarli config.php file.';
+    exit;
+}
+
+function hook_isso_render_linklist($data)
+{
+    // Only execute when linklist is rendered.
+    if (!empty($data['search_type']) && $data['search_type'] == 'permalink'
+        && count($data['links']) == 1) {
+
+        $isso_html = file_get_contents(PluginManager::$PLUGINS_PATH . '/isso/isso.html');
+
+        // data-isso-id is broken. This plugin is useless until it's fixed.
+        // https://github.com/posativ/isso/issues/27 (2013!)
+        $link = reset($data['links']);
+        $isso = sprintf(
+            $isso_html,
+            $GLOBALS['plugins']['ISSO_SERVER'],
+            $link['linkdate'],
+            $GLOBALS['plugins']['ISSO_SERVER']
+        );
+        $data['plugin_end_zone'][] = $isso;
+    }
+
+    return $data;
+}