library: Add support for saving and restoring the library

Eventually these functions may have to become idle tasks, but for now I
write to disk whenever the library_db is changed and then read from disk
by calling the init() function.

Signed-off-by: Anna Schumaker <schumaker.anna@gmail.com>

include/library.h

@@ -23,6 +23,7 @@ namespace library
 		std::string root_path;
 		bool enabled;
 
+		Library();
 		Library(const std::string &, bool);
 		void read(File &);
 		void write(File &);
@@ -33,6 +34,7 @@ namespace library
 	};
 
 
+	void init();
 	bool add_path(const std::string &);
 	void del_path(unsigned int);
 #ifdef CONFIG_DEBUG

lib/library.cpp

@@ -14,6 +14,11 @@ static Database<library :: Library> library_db("library.db", DB_NORMAL);
  * library :: Library:  Basic information about each directory in the library
  */
 
+library :: Library :: Library()
+	 : root_path(""), enabled(false)
+{
+}
+
 library :: Library :: Library(const std::string &path, bool is_enabled)
 	 : root_path(path), enabled(is_enabled)
 {
@@ -21,10 +26,13 @@ library :: Library :: Library(const std::string &path, bool is_enabled)
 
 void library :: Library :: read(File &f)
 {
+	f >> enabled;
+	root_path = f.getline();
 }
 
 void library :: Library :: write(File &f)
 {
+	f << enabled << " " << root_path;
 }
 
 #ifdef CONFIG_DEBUG
@@ -49,18 +57,25 @@ bool library :: Library :: operator==(library :: Library &rhs)
  * API used by the GUI begins here
  */
 
+void library :: init()
+{
+	library_db.load();
+}
+
 bool library :: add_path(const std::string &dir)
 {
 	if (g_file_test(dir.c_str(), G_FILE_TEST_IS_DIR) == false)
 		return false;
 
 	library_db.insert(library :: Library(dir, true));
+	library_db.save();
 	return true;
 }
 
 void library :: del_path(unsigned int id)
 {
 	library_db.remove(id);
+	library_db.save();
 }
 
 #ifdef CONFIG_DEBUG

tests/library/library.cpp

@@ -59,6 +59,24 @@ void test_2()
 	print("\n");
 }
 
+/* Test load and save of library db */
+void test_3()
+{
+	library :: reset();
+	test_add_dir("3a", "/tmp/library/0", true);
+	test_add_dir("3b", "/tmp/library/1", true);
+	test_add_dir("3c", "/tmp/library/2", true);
+
+	print("Test 3d\n");
+	library :: reset();
+	library :: print_db(library :: DB_LIBRARY);
+
+	print("Test 3e\n");
+	library :: init();
+	library :: print_db(library :: DB_LIBRARY);
+	print("\n");
+}
+
 int main(int argc, char **argv)
 {
 	gen_library();
@@ -66,5 +84,6 @@ int main(int argc, char **argv)
 	test_0();
 	test_1();
 	test_2();
+	test_3();
 	return 0;
 }