Add View::import_from_config method to match $view->export_config()

Takes the config without much validation, so the method will whine like
a little girl if the config doesn't have everything set.
Signed-off-by: Nigel McNie <nigel@catalyst.net.nz>

htdocs/lib/view.php

@@ -1541,6 +1541,53 @@ class View {
         return $config;
     }
 
+    /**
+     * Given a data structure like the one created by {@link export_config}, 
+     * creates and returns a View object representing the config.
+     *
+     * @param array $config The config, as generated by export_config. Note
+     *                      that if you miss fields, this method will throw
+     *                      warnings.
+     * @param int $userid   The user who issued the command to do the import 
+     *                      (defaults to the logged in user)
+     * @return View The created view
+     */
+    public static function import_from_config(array $config, $userid=null) {
+        $viewdata = array(
+            'title'       => $config['title'],
+            'description' => $config['description'],
+            'type'        => $config['type'],
+            'layout'      => $config['layout'],
+            'numcolumns'  => $config['numcolumns'],
+            'ownerformat' => $config['ownerformat'],
+        );
+        $view = View::create($viewdata, $userid);
+        if (isset($config['tags'])) $view->set('tags', $config['tags']);  // TODO can this be done in the constructor?
+
+        $col = 1;
+        foreach ($config['columns'] as $column) {
+            $row = 1;
+            foreach ($column as $blockinstance) {
+                safe_require('blocktype', $blockinstance['type']);
+                $bi = call_static_method(generate_class_name('blocktype', $blockinstance['type']), 'import_create_blockinstance', $blockinstance['config']);
+                if ($bi) {
+                    $bi->set('title',  $blockinstance['title']);
+                    $bi->set('column', $col);
+                    $bi->set('order',  $row);
+                    $view->addblockinstance($bi);
+
+                    $row++;
+                }
+                else {
+                    log_debug("Blocktype {$blockinstance['type']}'s import_create_blockinstance did not give us a blockinstance, so not importing this block");
+                }
+            }
+            $col++;
+        }
+
+        return $view;
+    }
+
 
     /**
      * Makes a URL for a view block editing page