Add 'Save As' entry to context menu shown when right clicking on a dive

Something which is nice especially when asked on the list to share an
interesting dive is the possibility to save just some dives into a file.

This commit adds to the context menu shown with right-click the 'Save As'
entry. This entry allows to save selected dives.

[Dirk Hohndel: clean up white space, commit message and remove unused
               variables]

Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

dive.h

@@ -515,6 +515,7 @@ extern void show_yearly_stats(void);
 
 extern void update_dive(struct dive *new_dive);
 extern void save_dives(const char *filename);
+extern void save_dives_logic(const char *filename, gboolean select_only);
 
 extern timestamp_t utc_mktime(struct tm *tm);
 extern void utc_mkdate(timestamp_t, struct tm *tm);

divelist.c

@@ -1621,6 +1621,31 @@ gboolean icon_click_cb(GtkWidget *w, GdkEventButton *event, gpointer data)
 	return FALSE;
 }
 
+static void save_as_cb(GtkWidget *menuitem, struct dive *dive)
+{
+	GtkWidget *dialog;
+	char *filename = NULL;
+
+	dialog = gtk_file_chooser_dialog_new(_("Save File As"),
+		GTK_WINDOW(main_window),
+		GTK_FILE_CHOOSER_ACTION_SAVE,
+		GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
+		GTK_STOCK_SAVE, GTK_RESPONSE_ACCEPT,
+		NULL);
+	gtk_file_chooser_set_do_overwrite_confirmation(GTK_FILE_CHOOSER(dialog), TRUE);
+
+	if (gtk_dialog_run(GTK_DIALOG(dialog)) == GTK_RESPONSE_ACCEPT) {
+		filename = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(dialog));
+	}
+	gtk_widget_destroy(dialog);
+
+	if (filename){
+		set_filename(filename, TRUE);
+		save_dives_logic(filename, TRUE);
+		g_free(filename);
+	}
+}
+
 static void expand_all_cb(GtkWidget *menuitem, GtkTreeView *tree_view)
 {
 	gtk_tree_view_expand_all(tree_view);
@@ -2409,6 +2434,10 @@ static void popup_divelist_menu(GtkTreeView *tree_view, GtkTreeModel *model, int
 				deletelabel = _(deleteplurallabel);
 				editlabel = _(editplurallabel);
 			}
+			menuitem = gtk_menu_item_new_with_label(_("Save as"));
+			g_signal_connect(menuitem, "activate", G_CALLBACK(save_as_cb), dive);
+			gtk_menu_shell_append(GTK_MENU_SHELL(menu), menuitem);
+
 			menuitem = gtk_menu_item_new_with_label(deletelabel);
 			g_signal_connect(menuitem, "activate", G_CALLBACK(delete_selected_dives_cb), path);
 			gtk_menu_shell_append(GTK_MENU_SHELL(menu), menuitem);

save-xml.c

@@ -535,6 +535,11 @@ static void save_device_info(FILE *f)
 #define VERSION 2
 
 void save_dives(const char *filename)
+{
+	save_dives_logic(filename, FALSE);
+}
+
+void save_dives_logic(const char *filename, const gboolean select_only)
 {
 	int i;
 	struct dive *dive;
@@ -561,6 +566,14 @@ void save_dives(const char *filename)
 
 	/* save the dives */
 	for_each_dive(i, dive) {
+
+		if (select_only) {
+
+			if(!dive->selected)
+				continue;
+			save_dive(f, dive);
+
+		} else {
 			trip = dive->divetrip;
 
 			/* Bare dive without a trip? */
@@ -577,6 +590,7 @@ void save_dives(const char *filename)
 			trip->index = 1;
 			save_trip(f, trip);
 		}
+	}
 	fprintf(f, "</dives>\n</divelog>\n");
 	fclose(f);
 }