libsaria: Added preferences

Right now I only store boolean values, but I think I've coded this in a
way to make adding new values easy.

include/libsaria/prefs.h

@@ -0,0 +1,19 @@
+#ifndef LIBSARIA_PREFS_H
+#define LIBSARIA_PREFS_H
+
+#include <string>
+using namespace std;
+
+namespace libsaria
+{
+	namespace prefs
+	{
+		void load();
+
+		void set(string, bool);
+
+		bool get_bool(string);
+	}
+}
+
+#endif /* LIBSARIA_PREFS_H */

libsaria/libsaria.cpp

@@ -2,6 +2,7 @@
 #include <libsaria/libsaria.h>
 #include <libsaria/audio.h>
 #include <libsaria/path.h>
+#include <libsaria/prefs.h>
 #include <libsaria/print.h>
 #include <libsaria/library.h>
 
@@ -16,6 +17,7 @@ namespace libsaria
 		println(get_saria_dir());
 		make_saria_dir();
 		libsaria::library::load();
+		libsaria::prefs::load();
 	}
 
 	void quit()

libsaria/prefs.cpp

@@ -0,0 +1,94 @@
+
+#include <map>
+using namespace std;
+
+#include <libsaria/files.h>
+#include <libsaria/prefs.h>
+
+enum pref_t {
+	BOOL,
+};
+
+struct Preference {
+	pref_t type;
+	union value {
+		bool boolean;
+	} value_u;
+};
+
+static map<string, Preference> preferences;
+
+static void load_pref(InFile &in)
+{
+	Preference p;
+	string key = in.read_str();
+	p.type     = (pref_t)in.read_ui();
+	switch (p.type) {
+	case BOOL:
+		p.value_u.boolean = in.read_int();
+		break;
+	default:
+		break;
+	}
+	preferences[key] = p;
+}
+
+static void save_pref(string key, struct Preference &p, OutFile &out)
+{
+	out.write_str(key,    false);
+	out.write_ui(p.type, false);
+	switch (p.type) {
+	case BOOL:
+		out.write_int(p.value_u.boolean, true);
+		break;
+	default:
+		out.write_str("", true);
+	}
+}
+
+static void save()
+{
+	map<string, Preference>::iterator it;
+	OutFile out("preferences");
+	out.write_ui(preferences.size(), true);
+	for (it = preferences.begin(); it != preferences.end(); it++)
+		save_pref(it->first, it->second, out);
+}
+
+static void set_preference(string key, struct Preference &p)
+{
+	preferences[key] = p;
+	save();
+}
+
+namespace libsaria
+{
+
+	void prefs::load()
+	{
+		InFile in("preferences");
+		unsigned int size = in.read_ui();
+		for (unsigned int i = 0; i < size; i++)
+			load_pref(in);
+	}
+
+	void prefs::set(string key, bool value)
+	{
+		struct Preference p;
+		p.type = BOOL;
+		p.value_u.boolean = value;
+		set_preference(key, p);
+	}
+
+	bool prefs::get_bool(string key)
+	{
+		map<string, Preference>::iterator it;
+		it = preferences.find(key);
+		if (it == preferences.end())
+			return false;
+		if (it->second.type != BOOL)
+			return false;
+		return it->second.value_u.boolean;
+	}
+
+}