Generalize chart loading functions

* ag_app_import_chart() became ag_app_import_file(), and has the potential
  to load any file type
* ag_app_import_cb() so it can open multiple file types
* ag_chart_load_from_file() is now called ag_chart_load_from_agc()

src/ag-app.c

@@ -133,14 +133,31 @@ quit_cb(GSimpleAction *action, GVariant *parameter, gpointer user_data)
 }
 
 static void
-ag_app_import_chart(AgApp *app, GFile *file)
+ag_app_import_file(AgApp *app, GFile *file, AgAppImportType type)
 {
     GtkWidget *window;
     AgChart   *chart;
     GError    *err = NULL;
 
-    if ((chart = ag_chart_load_from_file(file, &err)) == NULL) {
-        g_print("Error: '%s'\n", err->message);
+    switch (type) {
+        case AG_APP_IMPORT_AGC:
+            chart = ag_chart_load_from_agc(file, &err);
+
+            break;
+
+        default:
+            g_error("Unknown import type!");
+
+            break;
+    }
+
+    if (chart == NULL) {
+        ag_app_message_dialog(
+                NULL,
+                GTK_MESSAGE_ERROR,
+                "Error while loading: %s",
+                err->message
+            );
 
         return;
     }
@@ -157,7 +174,17 @@ ag_app_import_cb(GSimpleAction *action, GVariant *parameter, gpointer user_data)
 {
     gint            response;
     GtkWidget       *fs;
+    GtkFileFilter   *filter;
     GSList          *filenames   = NULL;
+    const gchar     *target_type = g_variant_get_string(parameter, NULL);
+    AgAppImportType type         = AG_APP_IMPORT_NONE;
+
+    if (strncmp("agc", target_type, 3) == 0) {
+        type = AG_APP_IMPORT_AGC;
+        filter = filter_chart;
+    } else {
+        g_error("Unknown import type!");
+    }
 
     fs = gtk_file_chooser_dialog_new(_("Select charts"),
                                      NULL,
@@ -166,8 +193,8 @@ ag_app_import_cb(GSimpleAction *action, GVariant *parameter, gpointer user_data)
                                      _("_Import"), GTK_RESPONSE_ACCEPT,
                                      NULL);
     gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(fs), filter_all);
-    gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(fs), filter_chart);
-    gtk_file_chooser_set_filter(GTK_FILE_CHOOSER(fs), filter_chart);
+    gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(fs), filter);
+    gtk_file_chooser_set_filter(GTK_FILE_CHOOSER(fs), filter);
     gtk_dialog_set_default_response(GTK_DIALOG(fs), GTK_RESPONSE_ACCEPT);
     gtk_file_chooser_set_select_multiple(GTK_FILE_CHOOSER(fs), TRUE);
     gtk_file_chooser_set_local_only(GTK_FILE_CHOOSER(fs), FALSE);
@@ -190,7 +217,7 @@ ag_app_import_cb(GSimpleAction *action, GVariant *parameter, gpointer user_data)
             }
 
             file = g_file_new_for_commandline_arg(data);
-            ag_app_import_chart(AG_APP(user_data), file);
+            ag_app_import_file(AG_APP(user_data), file, type);
         }
     }
 
@@ -250,7 +277,7 @@ static GActionEntry app_entries[] = {
     { "about",       about_cb,         NULL, NULL, NULL },
     { "quit",        quit_cb,          NULL, NULL, NULL },
     { "raise",       raise_cb,         NULL, NULL, NULL },
-    { "import",      ag_app_import_cb, NULL, NULL, NULL },
+    { "import",      ag_app_import_cb, "s",  NULL, NULL },
     { "help",        help_cb,          NULL, NULL, NULL },
 };
 
@@ -335,7 +362,7 @@ ag_app_import(GApplication *gapp,
     gint i;
 
     for (i = 0; i < n_files; i++) {
-        ag_app_import_chart(AG_APP(gapp), files[i]);
+        ag_app_import_file(AG_APP(gapp), files[i], AG_APP_IMPORT_AGC);
     }
 }
 

src/ag-app.h

@@ -7,6 +7,11 @@
 
 G_BEGIN_DECLS
 
+typedef enum {
+    AG_APP_IMPORT_NONE,
+    AG_APP_IMPORT_AGC,
+} AgAppImportType;
+
 #define AG_TYPE_APP         (ag_app_get_type())
 #define AG_APP(o)           (G_TYPE_CHECK_INSTANCE_CAST((o), \
                                                         AG_TYPE_APP, \

src/ag-chart.c

@@ -577,7 +577,7 @@ get_by_xpath(xmlXPathContextPtr xpath_context,
 }
 
 AgChart *
-ag_chart_load_from_file(GFile *file, GError **err)
+ag_chart_load_from_agc(GFile *file, GError **err)
 {
     AgChart            *chart = NULL;
     gchar              *uri,

src/ag-chart.h

@@ -48,7 +48,7 @@ AgChart *ag_chart_new_full(GsweTimestamp   *timestamp,
                            gdouble         altitude,
                            GsweHouseSystem house_system);
 
-AgChart *ag_chart_load_from_file(GFile  *file,
+AgChart *ag_chart_load_from_agc(GFile  *file,
                                 GError **err);
 
 AgChart *ag_chart_new_from_db_save(AgDbSave *save_data, GError **err);

src/resources/ui/astrognome.ui

@@ -11,6 +11,7 @@
             <item>
                 <attribute name="label" translatable="yes">Import</attribute>
                 <attribute name="action">app.import</attribute>
+                <attribute name="target">agc</attribute>
                 <attribute name="accel">&lt;Primary&gt;o</attribute>
             </item>
         </section>