Add installedPackages() to Catalog.

simgear/package/Catalog.cxx

@@ -198,6 +198,17 @@ Catalog::packagesNeedingUpdate() const
     return r;
 }
 
+PackageList
+Catalog::installedPackages() const
+{
+  PackageList r;
+  BOOST_FOREACH(PackageRef p, m_packages) {
+    if (p->isInstalled()) {
+      r.push_back(p);
+    }
+  }
+}
+  
 void Catalog::refresh()
 {
     Downloader* dl = new Downloader(this, url());

simgear/package/Catalog.hxx

@@ -72,7 +72,12 @@ public:
      * filter consists of required / minimum values, AND-ed together.
      */
     PackageList packagesMatching(const SGPropertyNode* aFilter) const;
-    
+
+    /**
+     * packages which are locally installed
+     */
+    PackageList installedPackages() const;
+
     /**
      * retrieve all the packages in the catalog which are installed
      * and have a pendig update