Added skeleton for the preferences code

src/Makefile.am

@@ -16,6 +16,7 @@ astrognome_source_files = \
 						  ag-window.c      \
 						  ag-chart.c       \
 						  ag-settings.c    \
+						  ag-preferences.c \
 						  astrognome.c     \
 						  $(NULL)
 

src/ag-app.c

@@ -2,6 +2,7 @@
 #include "ag-app.h"
 #include "ag-window.h"
 #include "ag-chart.h"
+#include "ag-preferences.h"
 #include "config.h"
 #include "astrognome.h"
 
@@ -65,7 +66,7 @@ new_window_cb(GSimpleAction *action, GVariant *parameter, gpointer user_data)
 static void
 preferences_cb(GSimpleAction *action, GVariant *parameter, gpointer user_data)
 {
-    //ag_preferences_show_dialog();
+   ag_preferences_show_dialog();
 }
 
 static void

src/ag-preferences.c

@@ -0,0 +1,43 @@
+#include <glib.h>
+#include <gtk/gtk.h>
+
+#include "ag-settings.h"
+
+typedef struct {
+    GtkWidget  *dialog;
+    AgSettings *settings;
+} AgPreferences;
+
+static AgPreferences *prefs;
+
+static void
+ag_preferences_init(void)
+{
+    GApplication *app;
+
+    if (prefs) {
+        return;
+    }
+
+    if ((app = g_application_get_default()) == NULL) {
+        g_warning("Cannot launch preferences: No default application found");
+
+        return;
+    }
+
+    prefs = g_new0(AgPreferences, 1);
+    prefs->settings = ag_settings_get();
+}
+
+void
+ag_preferences_show_dialog(void)
+{
+    ag_preferences_init();
+
+    if (prefs->dialog != NULL) {
+        gtk_window_present(GTK_WINDOW(prefs->dialog));
+
+        return;
+    }
+}
+

src/ag-preferences.h

@@ -0,0 +1,13 @@
+#ifndef __AG_PREFERENCES_H__
+#define __AG_PREFERENCES_H__
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+void ag_preferences_show_dialog(void);
+
+G_END_DECLS
+
+#endif /* __AG_PREFERENCES_H__ */
+