Run: initial implementation of Run app

Userland/Applications/Run/RunWindow.cpp

@@ -0,0 +1,170 @@
+/*
+ * Copyright (c) 2021, Nick Vella <nick@nxk.io>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "RunWindow.h"
+#include <AK/URL.h>
+#include <AK/URLParser.h>
+#include <Applications/Run/RunGML.h>
+#include <LibCore/File.h>
+#include <LibDesktop/Launcher.h>
+#include <LibGUI/Button.h>
+#include <LibGUI/Event.h>
+#include <LibGUI/FilePicker.h>
+#include <LibGUI/Icon.h>
+#include <LibGUI/ImageWidget.h>
+#include <LibGUI/MessageBox.h>
+#include <LibGUI/Widget.h>
+#include <serenity.h>
+#include <spawn.h>
+#include <stdio.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+RunWindow::RunWindow()
+{
+    auto app_icon = GUI::Icon::default_icon("app-run");
+
+    set_title("Run");
+    set_icon(app_icon.bitmap_for_size(16));
+    resize(345, 140);
+    set_resizable(false);
+    set_minimizable(false);
+
+    auto& main_widget = set_main_widget<GUI::Widget>();
+    main_widget.load_from_gml(run_gml);
+
+    m_icon_image_widget = *main_widget.find_descendant_of_type_named<GUI::ImageWidget>("icon");
+    m_icon_image_widget->set_bitmap(app_icon.bitmap_for_size(32));
+
+    m_path_text_box = *main_widget.find_descendant_of_type_named<GUI::TextBox>("path");
+    m_path_text_box->on_return_pressed = [this] {
+        m_ok_button->click();
+    };
+
+    m_ok_button = *main_widget.find_descendant_of_type_named<GUI::Button>("ok_button");
+    m_ok_button->on_click = [this](auto) {
+        do_run();
+    };
+
+    m_cancel_button = *main_widget.find_descendant_of_type_named<GUI::Button>("cancel_button");
+    m_cancel_button->on_click = [this](auto) {
+        close();
+    };
+
+    m_browse_button = *find_descendant_of_type_named<GUI::Button>("browse_button");
+    m_browse_button->on_click = [this](auto) {
+        Optional<String> path = GUI::FilePicker::get_open_filepath(this);
+        if (path.has_value())
+            m_path_text_box->set_text(path.value().view());
+    };
+}
+
+RunWindow::~RunWindow()
+{
+}
+
+void RunWindow::event(Core::Event& event)
+{
+    if (event.type() == GUI::Event::KeyUp || event.type() == GUI::Event::KeyDown) {
+        auto& key_event = static_cast<GUI::KeyEvent&>(event);
+        if (key_event.key() == Key_Escape) {
+            // Escape key pressed, close dialog
+            close();
+            return;
+        }
+    }
+
+    Window::event(event);
+}
+
+void RunWindow::do_run()
+{
+    auto run_input = m_path_text_box->text();
+
+    hide();
+
+    if (run_via_launch(run_input) || run_as_command(run_input)) {
+        close();
+        return;
+    }
+
+    GUI::MessageBox::show_error(this, "Failed to run. Please check your command, path, or address, and try again.");
+
+    show();
+}
+
+bool RunWindow::run_as_command(const String& run_input)
+{
+    pid_t child_pid;
+    const char* shell_executable = "/bin/Shell"; // TODO query and use the user's preferred shell.
+    const char* argv[] = { shell_executable, "-c", run_input.characters(), nullptr };
+
+    if ((errno = posix_spawn(&child_pid, shell_executable, nullptr, nullptr, const_cast<char**>(argv), environ))) {
+        perror("posix_spawn");
+        return false;
+    }
+
+    // Command spawned in child shell. Hide and wait for exit code.
+    int status;
+    if (waitpid(child_pid, &status, 0) < 0)
+        return false;
+
+    int child_error = WEXITSTATUS(status);
+    dbgln("Child shell exited with code {}", child_error);
+
+    // 127 is typically the shell indicating command not found. 126 for all other errors.
+    if (child_error == 126 || child_error == 127) {
+        return false;
+    }
+
+    dbgln("Ran via command shell.");
+
+    return true;
+}
+
+bool RunWindow::run_via_launch(const String& run_input)
+{
+    auto url = URL::create_with_url_or_path(run_input);
+
+    if (url.protocol() == "file") {
+        auto real_path = Core::File::real_path_for(url.path());
+        if (real_path.is_null()) {
+            // errno *should* be preserved from Core::File::real_path_for().
+            warnln("Failed to launch '{}': {}", url.path(), strerror(errno));
+            return false;
+        }
+        url = URL::create_with_url_or_path(real_path);
+    }
+
+    if (!Desktop::Launcher::open(url)) {
+        warnln("Failed to launch '{}'", url);
+        return false;
+    }
+
+    dbgln("Ran via URL launch.");
+
+    return true;
+}