From e243c8c448982dfd071490585096c043cb56cb65 Mon Sep 17 00:00:00 2001
From: David Mudrak <david.mudrak@gmail.com>
Date: Mon, 23 Aug 2010 14:24:38 +0000
Subject: [PATCH] NOMDL Added new core function to get a component version

---
 lib/adminlib.php | 77 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)

diff --git a/lib/adminlib.php b/lib/adminlib.php
index 610558c4f1d..d9362cb8a12 100644
--- a/lib/adminlib.php
+++ b/lib/adminlib.php
@@ -274,6 +274,83 @@ function uninstall_plugin($type, $name) {
     echo $OUTPUT->notification(get_string('success'), 'notifysuccess');
 }
 
+/**
+ * Returns the version of installed component
+ *
+ * @param string $component component name
+ * @param string $source either 'disk' or 'installed' - where to get the version information from
+ * @return string|bool version number or false if the component is not found
+ */
+function get_component_version($component, $source='installed') {
+    global $CFG, $DB;
+
+    list($type, $name) = normalize_component($component);
+
+    // moodle core or a core subsystem
+    if ($type === 'core') {
+        if ($source === 'installed') {
+            if (empty($CFG->version)) {
+                return false;
+            } else {
+                return $CFG->version;
+            }
+        } else {
+            if (!is_readable($CFG->dirroot.'/version.php')) {
+                return false;
+            } else {
+                include($CFG->dirroot.'/version.php');
+                return $version;
+            }
+        }
+    }
+
+    // activity module
+    if ($type === 'mod') {
+        if ($source === 'installed') {
+            return $DB->get_field('modules', 'version', array('name'=>$name));
+        } else {
+            $mods = get_plugin_list('mod');
+            if (empty($mod[$name]) or !is_readable($mod[$name].'/version.php')) {
+                return false;
+            } else {
+                $module = new stdclass();
+                include($mod[$name].'/version.php');
+                return $module->version;
+            }
+        }
+    }
+
+    // block
+    if ($type === 'block') {
+        if ($source === 'installed') {
+            return $DB->get_field('block', 'version', array('name'=>$name));
+        } else {
+            $blocks = get_plugin_list('block');
+            if (empty($blocks[$name]) or !is_readable($blocks[$name].'/version.php')) {
+                return false;
+            } else {
+                $plugin = new stdclass();
+                include($blocks[$name].'/version.php');
+                return $plugin->version;
+            }
+        }
+    }
+
+    // all other plugin types
+    if ($source === 'installed') {
+        return get_config($type.'_'.$name, 'version');
+    } else {
+        $plugins = get_plugin_list($type);
+        if (empty($plugins[$name])) {
+            return false;
+        } else {
+            $plugin = new stdclass();
+            include($plugins[$name].'/version.php');
+            return $plugin->version;
+        }
+    }
+}
+
 /**
  * Delete all plugin tables
  *