text: /*
   * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
   * 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 <Kernel/KeyCode.h>
  #include <LibCore/CArgsParser.h>
  #include <LibCore/CUserInfo.h>
  #include <LibDraw/PNGLoader.h>
  #include <LibGUI/GAboutDialog.h>
  #include <LibGUI/GAction.h>
  #include <LibGUI/GActionGroup.h>
  #include <LibGUI/GApplication.h>
  #include <LibGUI/GBoxLayout.h>
  #include <LibGUI/GFontDatabase.h>
  #include <LibGUI/GGroupBox.h>
  #include <LibGUI/GMenuBar.h>
  #include <LibGUI/GRadioButton.h>
  #include <LibGUI/GSlider.h>
  #include <LibGUI/GWidget.h>
  #include <LibGUI/GWindow.h>
  #include <LibVT/TerminalWidget.h>
  #include <assert.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <pwd.h>
  #include <signal.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <sys/ioctl.h>
  #include <sys/select.h>
  #include <unistd.h>
  
  static void run_command(int ptm_fd, String command)
  {
      pid_t pid = fork();
      if (pid == 0) {
          const char* tty_name = ptsname(ptm_fd);
          if (!tty_name) {
              perror("ptsname");
              exit(1);
          }
          close(ptm_fd);
          int pts_fd = open(tty_name, O_RDWR);
          if (pts_fd < 0) {
              perror("open");
              exit(1);
          }
  
          if (setsid() < 0) {
              perror("setsid");
          }
  
          close(0);
          close(1);
          close(2);
  
          int rc = dup2(pts_fd, 0);
          if (rc < 0) {
              perror("dup2");
              exit(1);
          }
          rc = dup2(pts_fd, 1);
          if (rc < 0) {
              perror("dup2");
              exit(1);
          }
          rc = dup2(pts_fd, 2);
          if (rc < 0) {
              perror("dup2");
              exit(1);
          }
          rc = close(pts_fd);
          if (rc < 0) {
              perror("close");
              exit(1);
          }
          rc = ioctl(0, TIOCSCTTY);
          if (rc < 0) {
              perror("ioctl(TIOCSCTTY)");
              exit(1);
          }
  
          String shell = "/bin/Shell";
          auto* pw = getpwuid(getuid());
          if (pw && pw->pw_shell) {
              shell = pw->pw_shell;
          }
          endpwent();
  
          const char* args[4] = { shell.characters(), nullptr, nullptr, nullptr };
          if (!command.is_empty()) {
              args[1] = "-c";
              args[2] = command.characters();
          }
          const char* envs[] = { "TERM=xterm", "PATH=/bin:/usr/bin:/usr/local/bin", nullptr };
          rc = execve(shell.characters(), const_cast<char**>(args), const_cast<char**>(envs));
          if (rc < 0) {
              perror("execve");
              exit(1);
          }
          ASSERT_NOT_REACHED();
      }
  }
  
  RefPtr<GWindow> create_settings_window(TerminalWidget& terminal, RefPtr<CConfigFile> config)
  {
      auto window = GWindow::construct();
      window->set_title("Terminal Settings");
      window->set_rect(50, 50, 200, 140);
  
      auto settings = GWidget::construct();
      window->set_main_widget(settings);
      settings->set_fill_with_background_color(true);
      settings->set_background_role(ColorRole::Button);
      settings->set_layout(make<GBoxLayout>(Orientation::Vertical));
      settings->layout()->set_margins({ 4, 4, 4, 4 });
  
      auto radio_container = GGroupBox::construct("Bell Mode", settings);
      radio_container->set_layout(make<GBoxLayout>(Orientation::Vertical));
      radio_container->layout()->set_margins({ 6, 16, 6, 6 });
      radio_container->set_size_policy(SizePolicy::Fill, SizePolicy::Fixed);
      radio_container->set_preferred_size(100, 70);
  
      auto sysbell_radio = GRadioButton::construct("Use (Audible) System Bell", radio_container);
      auto visbell_radio = GRadioButton::construct("Use (Visual) Terminal Bell", radio_container);
      sysbell_radio->set_checked(terminal.should_beep());
      visbell_radio->set_checked(!terminal.should_beep());
      sysbell_radio->on_checked = [&terminal](const bool checked) {
          terminal.set_should_beep(checked);
      };
  
      auto slider_container = GGroupBox::construct("Background Opacity", settings);
      slider_container->set_layout(make<GBoxLayout>(Orientation::Vertical));
      slider_container->layout()->set_margins({ 6, 16, 6, 6 });
      slider_container->set_size_policy(SizePolicy::Fill, SizePolicy::Fixed);
      slider_container->set_preferred_size(100, 50);
      auto slider = GSlider::construct(Orientation::Horizontal, slider_container);
  
      slider->on_value_changed = [&terminal, &config](int value) {
          terminal.set_opacity(value);
      };
  
      slider->set_range(0, 255);
      slider->set_value(terminal.opacity());
  
      return window;
  }
  
  int main(int argc, char** argv)
  {
      if (pledge("stdio tty rpath accept cpath wpath shared_buffer proc exec unix fattr", nullptr) < 0) {
          perror("pledge");
          return 1;
      }
  
      struct sigaction act;
      memset(&act, 0, sizeof(act));
      act.sa_flags = SA_NOCLDWAIT;
      act.sa_handler = SIG_IGN;
      int rc = sigaction(SIGCHLD, &act, nullptr);
      if (rc < 0) {
          perror("sigaction");
          return 1;
      }
  
      GApplication app(argc, argv);
  
      if (pledge("stdio tty rpath accept cpath wpath shared_buffer proc exec", nullptr) < 0) {
          perror("pledge");
          return 1;
      }
  
      const char* command_to_execute = "/bin/Shell";
  
      CArgsParser args_parser;
      args_parser.add_option(command_to_execute, "Execute this command inside the terminal", nullptr, 'e', "command");
      args_parser.parse(argc, argv);
  
      if (chdir(get_current_user_home_path().characters()) < 0)
          perror("chdir");
  
      int ptm_fd = open("/dev/ptmx", O_RDWR | O_CLOEXEC);
      if (ptm_fd < 0) {
          perror("open(ptmx)");
          return 1;
      }
  
      run_command(ptm_fd, command_to_execute);
  
      auto window = GWindow::construct();
      window->set_title("Terminal");
      window->set_background_color(Color::Black);
      window->set_double_buffering_enabled(false);
  
      RefPtr<CConfigFile> config = CConfigFile::get_for_app("Terminal");
      auto terminal = TerminalWidget::construct(ptm_fd, true, config);
      terminal->on_command_exit = [&] {
          app.quit(0);
      };
      terminal->on_title_change = [&](auto& title) {
          window->set_title(title);
      };
      window->set_main_widget(terminal);
      window->move_to(300, 300);
      terminal->apply_size_increments_to_window(*window);
      window->show();
      window->set_icon(load_png("/res/icons/16x16/app-terminal.png"));
      terminal->set_should_beep(config->read_bool_entry("Window", "AudibleBeep", false));
  
      RefPtr<GWindow> settings_window;
  
      auto new_opacity = config->read_num_entry("Window", "Opacity", 255);
      terminal->set_opacity(new_opacity);
      window->set_has_alpha_channel(new_opacity < 255);
  
      auto menubar = make<GMenuBar>();
  
      auto app_menu = GMenu::construct("Terminal");
      app_menu->add_action(GAction::create("Open new terminal", { Mod_Ctrl | Mod_Shift, Key_N }, GraphicsBitmap::load_from_file("/res/icons/16x16/app-terminal.png"), [&](auto&) {
          if (!fork()) {
              execl("/bin/Terminal", "Terminal", nullptr);
              exit(1);
          }
      }));
      app_menu->add_action(GAction::create("Settings...", load_png("/res/icons/gear16.png"),
          [&](const GAction&) {
              if (!settings_window) {
                  settings_window = create_settings_window(*terminal, config);
                  settings_window->on_close_request = [&] {
                      settings_window = nullptr;
                      return GWindow::CloseRequestDecision::Close;
                  };
              }
              settings_window->show();
              settings_window->move_to_front();
          }));
      app_menu->add_separator();
      app_menu->add_action(GCommonActions::make_quit_action([](auto&) {
          dbgprintf("Terminal: Quit menu activated!\n");
          GApplication::the().quit(0);
      }));
      menubar->add_menu(move(app_menu));
  
      auto edit_menu = GMenu::construct("Edit");
      edit_menu->add_action(terminal->copy_action());
      edit_menu->add_action(terminal->paste_action());
      menubar->add_menu(move(edit_menu));
  
      GActionGroup font_action_group;
      font_action_group.set_exclusive(true);
      auto font_menu = GMenu::construct("Font");
      GFontDatabase::the().for_each_fixed_width_font([&](const StringView& font_name) {
          auto action = GAction::create(font_name, [&](GAction& action) {
              action.set_checked(true);
              terminal->set_font(GFontDatabase::the().get_by_name(action.text()));
              auto metadata = GFontDatabase::the().get_metadata_by_name(action.text());
              ASSERT(metadata.has_value());
              config->write_entry("Text", "Font", metadata.value().path);
              config->sync();
              terminal->force_repaint();
          });
          font_action_group.add_action(*action);
          action->set_checkable(true);
          if (terminal->font().name() == font_name)
              action->set_checked(true);
          font_menu->add_action(*action);
      });
      menubar->add_menu(move(font_menu));
  
      auto help_menu = GMenu::construct("Help");
      help_menu->add_action(GAction::create("About", [&](const GAction&) {
          GAboutDialog::show("Terminal", load_png("/res/icons/32x32/app-terminal.png"), window);
      }));
      menubar->add_menu(move(help_menu));
  
      app.set_menubar(move(menubar));
  
      if (unveil("/res", "r") < 0) {
          perror("unveil");
          return 1;
      }
  
      if (unveil("/bin/Terminal", "x") < 0) {
          perror("unveil");
          return 1;
      }
  
      if (unveil(config->file_name().characters(), "rwc")) {
          perror("unveil");
          return 1;
      }
  
      unveil(nullptr, nullptr);
  
      config->sync();
      return app.exec();
  }
  