TextEditor: Make use of GFilePicker to select a file to open

Applications/TextEditor/main.cpp

@@ -2,6 +2,8 @@
 #include <LibGUI/GWidget.h>
 #include <LibGUI/GBoxLayout.h>
 #include <LibGUI/GApplication.h>
+#include <LibGUI/GFilePicker.h>
+#include <LibGUI/GMessageBox.h>
 #include <LibGUI/GStatusBar.h>
 #include <LibGUI/GToolBar.h>
 #include <LibGUI/GMenuBar.h>
@@ -15,10 +17,23 @@
 #include <signal.h>
 #include <fcntl.h>
 
+void open_sesame(GWindow& window, GTextEditor& editor, const String& path)
+{
+    CFile file(path);
+
+    if (!file.open(CIODevice::ReadOnly)) {
+        GMessageBox::show(String::format("Opening \"%s\" failed: %s", path.characters(), strerror(errno)), "Error", GMessageBox::Type::Error, &window);
+    }
+
+    window.set_title(String::format("TextEditor: %s", path.characters()));
+    editor.set_text(String::copy(file.read_all()));
+}
+
 int main(int argc, char** argv)
 {
     GApplication app(argc, argv);
 
+    auto* window = new GWindow;
     auto* widget = new GWidget;
     widget->set_layout(make<GBoxLayout>(Orientation::Vertical));
     widget->layout()->set_spacing(0);
@@ -38,21 +53,19 @@ int main(int argc, char** argv)
     String path = "/tmp/TextEditor.save.txt";
     if (argc >= 2) {
         path = argv[1];
-        CFile file(path);
-
-        if (!file.open(CIODevice::ReadOnly)) {
-            fprintf(stderr, "Opening %s: %s\n", path.characters(), file.error_string());
-            return 1;
-        }
-        text_editor->set_text(String::copy(file.read_all()));
+        open_sesame(*window, *text_editor, path);
     }
 
     auto new_action = GAction::create("New document", { Mod_Ctrl, Key_N }, GraphicsBitmap::load_from_file("/res/icons/16x16/new.png"), [] (const GAction&) {
         dbgprintf("FIXME: Implement File/New\n");
     });
 
-    auto open_action = GAction::create("Open document", { Mod_Ctrl, Key_O }, GraphicsBitmap::load_from_file("/res/icons/16x16/open.png"), [] (const GAction&) {
-        dbgprintf("FIXME: Implement File/Open\n");
+    auto open_action = GAction::create("Open document", { Mod_Ctrl, Key_O }, GraphicsBitmap::load_from_file("/res/icons/16x16/open.png"), [window, text_editor, &path](const GAction&) {
+        GFilePicker picker;
+        if (picker.exec() == GDialog::ExecOK) {
+            path = picker.selected_file();
+            open_sesame(*window, *text_editor, path);
+        }
     });
 
     auto save_action = GAction::create("Save document", { Mod_Ctrl, Key_S }, GraphicsBitmap::load_from_file("/res/icons/16x16/save.png"), [&] (const GAction&) {
@@ -117,8 +130,6 @@ int main(int argc, char** argv)
     toolbar->add_action(text_editor->undo_action());
     toolbar->add_action(text_editor->redo_action());
 
-    auto* window = new GWindow;
-    window->set_title(String::format("TextEditor: %s", path.characters()));
     window->set_rect(20, 200, 640, 400);
     window->set_main_widget(widget);
     window->set_should_exit_event_loop_on_close(true);