Add SVG export functionality

src/ag-chart.c

@@ -858,3 +858,15 @@ ag_chart_create_svg(AgChart *chart, gsize *length, GError **err)
     return save_content;
 }
 
+void
+ag_chart_export_svg_to_file(AgChart *chart, GFile *file, GError **err)
+{
+    gchar *svg;
+    gsize length;
+
+    if ((svg = ag_chart_create_svg(chart, &length, err)) == NULL) {
+        return;
+    }
+
+    g_file_replace_contents(file, (const gchar *)svg, length, NULL, FALSE, G_FILE_CREATE_NONE, NULL, NULL, err);
+}

src/ag-chart.h

@@ -43,6 +43,10 @@ void ag_chart_save_to_file(AgChart *chart,
                            GFile   *file,
                            GError  **err);
 
+void ag_chart_export_svg_to_file(AgChart *chart,
+                                 GFile   *file,
+                                 GError  **err);
+
 void ag_chart_set_name(AgChart     *chart,
                        const gchar *name);
 gchar *ag_chart_get_name(AgChart *chart);

src/ag-window.c

@@ -170,6 +170,81 @@ ag_window_save_as_action(GSimpleAction *action, GVariant *parameter, gpointer us
     // TODO: Check err!
 }
 
+static void
+ag_window_export_svg(AgWindow *window, GError **err)
+{
+    gchar     *name;
+    gchar     *file_name;
+    GtkWidget *fs;
+    gint      response;
+
+    recalculate_chart(window);
+
+    // We should never enter here, but who knows...
+    if (window->priv->chart == NULL) {
+        GtkWidget *dialog;
+
+        dialog = gtk_message_dialog_new(GTK_WINDOW(window), GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT, GTK_MESSAGE_ERROR, GTK_BUTTONS_OK, _("Chart cannot be calculated."));
+        gtk_dialog_run(GTK_DIALOG(dialog));
+        gtk_widget_destroy(dialog);
+        g_set_error(err, AG_WINDOW_ERROR, AG_WINDOW_ERROR_EMPTY_CHART, "Chart is empty");
+
+        return;
+    }
+
+    name = ag_chart_get_name(window->priv->chart);
+
+    if ((name == NULL) || (*name == 0)) {
+        GtkWidget *dialog;
+
+        g_free(name);
+
+        dialog = gtk_message_dialog_new(GTK_WINDOW(window), GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT, GTK_MESSAGE_ERROR, GTK_BUTTONS_OK, _("You must enter a name before saving a chart."));
+        gtk_dialog_run(GTK_DIALOG(dialog));
+        gtk_widget_destroy(dialog);
+        g_set_error(err, AG_WINDOW_ERROR, AG_WINDOW_ERROR_NO_NAME, "No name specified");
+
+        return;
+    }
+
+    file_name = g_strdup_printf("%s.svg", name);
+    g_free(name);
+
+    fs = gtk_file_chooser_dialog_new(_("Export Chart as SVG"),
+                                     GTK_WINDOW(window),
+                                     GTK_FILE_CHOOSER_ACTION_SAVE,
+                                     _("_Cancel"), GTK_RESPONSE_CANCEL,
+                                     _("_Save"), GTK_RESPONSE_ACCEPT,
+                                     NULL);
+    gtk_dialog_set_default_response(GTK_DIALOG(fs), GTK_RESPONSE_ACCEPT);
+    gtk_file_chooser_set_local_only(GTK_FILE_CHOOSER(fs), FALSE);
+    gtk_file_chooser_set_do_overwrite_confirmation(GTK_FILE_CHOOSER(fs), TRUE);
+    gtk_file_chooser_set_current_name(GTK_FILE_CHOOSER(fs), file_name);
+    g_free(file_name);
+
+    response = gtk_dialog_run(GTK_DIALOG(fs));
+    gtk_widget_hide(fs);
+
+    if (response == GTK_RESPONSE_ACCEPT) {
+        GFile *file = gtk_file_chooser_get_file(GTK_FILE_CHOOSER(fs));
+
+        ag_chart_export_svg_to_file(window->priv->chart, file, err);
+    }
+
+    gtk_widget_destroy(fs);
+}
+
+static void
+ag_window_export_svg_action(GSimpleAction *action, GVariant *parameter, gpointer user_data)
+{
+    AgWindow *window = AG_WINDOW(user_data);
+    GError *err = NULL;
+
+    ag_window_export_svg(window, &err);
+
+    // TODO: Check err!
+}
+
 void
 ag_window_redraw_chart(AgWindow *window)
 {
@@ -321,6 +396,7 @@ static GActionEntry win_entries[] = {
     { "close",      ag_window_close_action,      NULL, NULL,      NULL },
     { "save",       ag_window_save_action,       NULL, NULL,      NULL },
     { "save-as",    ag_window_save_as_action,    NULL, NULL,      NULL },
+    { "export-svg", ag_window_export_svg_action, NULL, NULL,      NULL },
     { "gear-menu",  ag_window_gear_menu_action,  NULL, "false",   NULL },
     { "change-tab", ag_window_change_tab_action, "s",  "'edit'",  NULL },
 };

src/astrognome.ui

@@ -46,6 +46,12 @@
                 <attribute name="accel">&lt;Primary&gt;&lt;Shift&gt;s</attribute>
             </item>
         </section>
+        <section>
+            <item>
+                <attribute name="label" translatable="yes">Export as SVG</attribute>
+                <attribute name="action">win.export-svg</attribute>
+            </item>
+        </section>
         <section>
             <item>
                 <attribute name="label" translatable="yes">Close</attribute>