help_gui.cpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <https://www.gnu.org/licenses/old-licenses/gpl-2.0>.
 */

 
#include "stdafx.h"
#include "gui.h"
#include "window_gui.h"
#include "textfile_gui.h"
#include "fileio_func.h"
#include "table/control_codes.h"
#include "string_func.h"
#include "openttd.h"
#include "help_gui.h"
 
#include "widgets/help_widget.h"
#include "widgets/misc_widget.h"
 
#include "table/strings.h"
 
#include "safeguards.h"
 
static const std::string README_FILENAME = "README.md";
static const std::string CHANGELOG_FILENAME = "changelog.md";
static const std::string KNOWN_BUGS_FILENAME = "known-bugs.md";
static const std::string LICENSE_FILENAME = "COPYING.md";
static const std::string FONTS_FILENAME = "fonts.md";
 
static const std::string WEBSITE_LINK = "https://www.openttd.org/";
static const std::string WIKI_LINK = "https://wiki.openttd.org/";
static const std::string BUGTRACKER_LINK = "https://bugs.openttd.org/";
static const std::string COMMUNITY_LINK = "https://community.openttd.org/";

static constexpr size_t CHANGELOG_VERSIONS_LIMIT = 20;

static std::optional<std::string> FindGameManualFilePath(std::string_view filename, Subdirectory subdir)
{
  static const Searchpath searchpaths[] = {
    SP_APPLICATION_BUNDLE_DIR, SP_INSTALLATION_DIR, SP_SHARED_DIR, SP_BINARY_DIR, SP_WORKING_DIR
  };
 
  for (Searchpath sp : searchpaths) {
    std::string file_path = FioGetDirectory(sp, subdir);
    file_path.append(filename);
    if (FioCheckFileExists(file_path, NO_DIRECTORY)) return file_path;
  }
 
  return {};
}

struct GameManualTextfileWindow : public TextfileWindow {
  GameManualTextfileWindow(std::string_view filename, Subdirectory subdir) : TextfileWindow(nullptr, TFT_GAME_MANUAL)
  {
    this->ConstructWindow();
 
    /* Mark the content of these files as trusted. */
    this->trusted = true;
 
    auto filepath = FindGameManualFilePath(filename, subdir);
    /* The user could, in theory, have moved the file. So just show an empty window if that is the case. */
    if (!filepath.has_value()) {
      return;
    }
 
    this->filepath = filepath.value();
    this->LoadTextfile(this->filepath, NO_DIRECTORY);
    this->OnClick({ 0, 0 }, WID_TF_WRAPTEXT, 1);
  }
 
  std::string GetWidgetString(WidgetID widget, StringID stringid) const override
  {
    if (widget == WID_TF_CAPTION) {
      return GetString(stringid, this->filename);
    }
 
    return this->Window::GetWidgetString(widget, stringid);
  }
 
  void AfterLoadText() override
  {
    if (this->filename == CHANGELOG_FILENAME) {
      this->link_anchors.clear();
      this->AfterLoadChangelog();
    }
    this->TextfileWindow::AfterLoadText();
  }

  void AfterLoadChangelog()
  {
    uint versions = 0;
 
    /* Look for lines beginning with ###, they indicate a release name. */
    for (size_t line_index = 0; line_index < this->lines.size(); ++line_index) {
      const Line &line = this->lines[line_index];
      if (!line.text.starts_with("###")) continue;
 
      if (versions >= CHANGELOG_VERSIONS_LIMIT) {
        this->lines.resize(line_index - 2);
        break;
      }
 
      ++versions;
    }
  }
};

struct HelpWindow : public Window {
 
  HelpWindow(WindowDesc &desc, WindowNumber number) : Window(desc)
  {
    this->InitNested(number);
 
    this->EnableTextfileButton(README_FILENAME, BASE_DIR, WID_HW_README);
    this->EnableTextfileButton(CHANGELOG_FILENAME, BASE_DIR, WID_HW_CHANGELOG);
    this->EnableTextfileButton(KNOWN_BUGS_FILENAME, BASE_DIR, WID_HW_KNOWN_BUGS);
    this->EnableTextfileButton(LICENSE_FILENAME, BASE_DIR, WID_HW_LICENSE);
    this->EnableTextfileButton(FONTS_FILENAME, DOCS_DIR, WID_HW_FONTS);
  }
 
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
  {
    switch (widget) {
      case WID_HW_README:
        new GameManualTextfileWindow(README_FILENAME, BASE_DIR);
        break;
      case WID_HW_CHANGELOG:
        new GameManualTextfileWindow(CHANGELOG_FILENAME, BASE_DIR);
        break;
      case WID_HW_KNOWN_BUGS:
        new GameManualTextfileWindow(KNOWN_BUGS_FILENAME, BASE_DIR);
        break;
      case WID_HW_LICENSE:
        new GameManualTextfileWindow(LICENSE_FILENAME, BASE_DIR);
        break;
      case WID_HW_FONTS:
        new GameManualTextfileWindow(FONTS_FILENAME, DOCS_DIR);
        break;
      case WID_HW_WEBSITE:
        OpenBrowser(WEBSITE_LINK);
        break;
      case WID_HW_WIKI:
        OpenBrowser(WIKI_LINK);
        break;
      case WID_HW_BUGTRACKER:
        OpenBrowser(BUGTRACKER_LINK);
        break;
      case WID_HW_COMMUNITY:
        OpenBrowser(COMMUNITY_LINK);
        break;
    }
  }
 
private:
  void EnableTextfileButton(std::string_view filename, Subdirectory subdir, WidgetID button_widget)
  {
    this->GetWidget<NWidgetLeaf>(button_widget)->SetDisabled(!FindGameManualFilePath(filename, subdir).has_value());
  }
};
 
static constexpr std::initializer_list<NWidgetPart> _nested_helpwin_widgets = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_DARK_GREEN),
    NWidget(WWT_CAPTION, COLOUR_DARK_GREEN), SetStringTip(STR_HELP_WINDOW_CAPTION),
  EndContainer(),
 
  NWidget(WWT_PANEL, COLOUR_DARK_GREEN),
    NWidget(NWID_HORIZONTAL), SetPIP(0, WidgetDimensions::unscaled.hsep_wide, 0), SetPadding(WidgetDimensions::unscaled.sparse),
      NWidget(WWT_FRAME, COLOUR_DARK_GREEN), SetStringTip(STR_HELP_WINDOW_WEBSITES),
        NWidget(WWT_PUSHTXTBTN, COLOUR_GREEN, WID_HW_WEBSITE), SetStringTip(STR_HELP_WINDOW_MAIN_WEBSITE), SetMinimalSize(128, 12), SetFill(1, 0),
        NWidget(WWT_PUSHTXTBTN, COLOUR_GREEN, WID_HW_WIKI), SetStringTip(STR_HELP_WINDOW_MANUAL_WIKI), SetMinimalSize(128, 12), SetFill(1, 0),
        NWidget(WWT_PUSHTXTBTN, COLOUR_GREEN, WID_HW_BUGTRACKER), SetStringTip(STR_HELP_WINDOW_BUGTRACKER), SetMinimalSize(128, 12), SetFill(1, 0),
        NWidget(WWT_PUSHTXTBTN, COLOUR_GREEN, WID_HW_COMMUNITY), SetStringTip(STR_HELP_WINDOW_COMMUNITY), SetMinimalSize(128, 12), SetFill(1, 0),
      EndContainer(),
 
      NWidget(WWT_FRAME, COLOUR_DARK_GREEN), SetStringTip(STR_HELP_WINDOW_DOCUMENTS),
        NWidget(WWT_PUSHTXTBTN, COLOUR_GREEN, WID_HW_README), SetStringTip(STR_HELP_WINDOW_README), SetMinimalSize(128, 12), SetFill(1, 0),
        NWidget(WWT_PUSHTXTBTN, COLOUR_GREEN, WID_HW_CHANGELOG), SetStringTip(STR_HELP_WINDOW_CHANGELOG), SetMinimalSize(128, 12), SetFill(1, 0),
        NWidget(WWT_PUSHTXTBTN, COLOUR_GREEN, WID_HW_KNOWN_BUGS),SetStringTip(STR_HELP_WINDOW_KNOWN_BUGS), SetMinimalSize(128, 12), SetFill(1, 0),
        NWidget(WWT_PUSHTXTBTN, COLOUR_GREEN, WID_HW_LICENSE), SetStringTip(STR_HELP_WINDOW_LICENSE), SetMinimalSize(128, 12), SetFill(1, 0),
        NWidget(WWT_PUSHTXTBTN, COLOUR_GREEN, WID_HW_FONTS), SetStringTip(STR_HELP_WINDOW_FONTS), SetMinimalSize(128, 12), SetFill(1, 0),
      EndContainer(),
    EndContainer(),
  EndContainer(),
};
 
static WindowDesc _helpwin_desc(
  WDP_CENTER, {}, 0, 0,
  WC_HELPWIN, WC_NONE,
  {},
  _nested_helpwin_widgets
);
 
void ShowHelpWindow()
{
  AllocateWindowDescFront<HelpWindow>(_helpwin_desc, 0);
}