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	diff --git a/src/HelpManager.cpp b/src/HelpManager.cpp
	index 4f59b27..1d292b1 100644
	--- a/src/HelpManager.cpp
	+++ b/src/HelpManager.cpp
	@@ -1,1184 +1,1184 @@
	/*
	* Copyright (C) 2019 Me and My Shadow
	*
	* This file is part of Me and My Shadow.
	*
	* Me and My Shadow 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, either version 3 of the License, or
	* (at your option) any later version.
	*
	* Me and My Shadow 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 Me and My Shadow. If not, see <http://www.gnu.org/licenses/>.
	*/

	#include "HelpManager.h"
	#include "Functions.h"
	#include "GUIWindow.h"
	#include "GUIListBox.h"
	#include "GUITextArea.h"
	#include "WordWrapper.h"
	#include "ThemeManager.h"
	#include <iostream>
	#include <fstream>
	#include <sstream>
	#include <algorithm>
	#include <stdio.h>

	#include "SDL_ttf_fontfallback.h"

	class Chunk {
	public:
	int cachedMaxWidth, cachedWidth, cachedNumberOfLines;

	public:
	Chunk() : cachedMaxWidth(-1), cachedWidth(-1), cachedNumberOfLines(-1) {}
	virtual ~Chunk() {}

	void updateSize(int maxWidth) {
	if (maxWidth != cachedMaxWidth) updateSizeForced(maxWidth);
	}

	virtual void updateSizeForced(int maxWidth) = 0;
	virtual void createSurfaces(std::vector<SurfacePtr>& surfaces, std::vector<GUITextArea::Hyperlink2>& links) = 0;
	};

	class ParagraphChunk : public Chunk {
	public:
	std::string text;

	std::vector<std::string> cachedLines;

	virtual void updateSizeForced(int maxWidth) override {
	WordWrapper wrapper;
	wrapper.font = fontText;
	wrapper.wordWrap = true;
	wrapper.maxWidth = maxWidth;
	wrapper.hyphen = "-";
	wrapper.hyphenatorLanguage = "en";
	wrapper.reservedFragments.insert("/");

	//TODO: verbatim support
	cachedLines.clear();
	cachedMaxWidth = maxWidth;
	cachedWidth = wrapper.addString(cachedLines, text);
	cachedNumberOfLines = cachedLines.size();
	}

	virtual void createSurfaces(std::vector<SurfacePtr>& surfaces, std::vector<GUITextArea::Hyperlink2>& links) override {
	SDL_Color fg = objThemes.getTextColor(true);
	for (const std::string& s : cachedLines) {
	surfaces.emplace_back(TTF_RenderUTF8_Blended(fontText, s.c_str(), fg));
	}

	//TODO: extract hyperlinks
	}
	};

	struct FakeTOCItem {
	std::string caption;
	int level, pageIndex;
	};

	class FakeTOCChunk : public Chunk {
	public:
	std::vector<FakeTOCItem> items;

	virtual void updateSizeForced(int maxWidth) override {
	int width = 0;

	for (const FakeTOCItem& item : items) {
	int w = 0;
	TTF_SizeUTF8(fontText, item.caption.c_str(), &w, NULL);
	w += (item.level + 1) * 16;
	width = std::max(width, w);
	}

	cachedMaxWidth = maxWidth;
	cachedWidth = width;
	cachedNumberOfLines = items.size();
	}

	virtual void createSurfaces(std::vector<SurfacePtr>& surfaces, std::vector<GUITextArea::Hyperlink2>& links) override {
	SDL_Color fg = objThemes.getTextColor(true);
	auto bmGUI = getImageManager().loadImage(getDataPath() + "gfx/gui.png");

	for (const FakeTOCItem& item : items) {
	SurfacePtr surf1(TTF_RenderUTF8_Blended(fontText, item.caption.empty() ? " " : item.caption.c_str(), fg));
	SurfacePtr surf = createSurface(surf1->w + (item.level + 1) * 16, surf1->h);

	SDL_Rect srcrect = { 0, 0, surf1->w, surf1->h };
	SDL_Rect dstrect = { (item.level + 1) * 16, 0, surf1->w, surf1->h };
	SDL_BlitSurface(surf1.get(), &srcrect, surf.get(), &dstrect);

	srcrect = SDL_Rect{ 80, 64, 16, 16 };
	dstrect = SDL_Rect{ item.level * 16, (surf1->h - 16) / 2, 16, 16 };
	SDL_BlitSurface(bmGUI, &srcrect, surf.get(), &dstrect);

	if (item.pageIndex >= 0) {
	char s[32];
	sprintf(s, "page:%d", item.pageIndex);
	- links.push_back(GUITextArea::Hyperlink2{ surfaces.size(), (item.level + 1) * 16, surf->w, s });
	+ links.push_back(GUITextArea::Hyperlink2{ (int)surfaces.size(), (item.level + 1) * 16, surf->w, s });
	}

	surfaces.push_back(std::move(surf));
	}
	}
	};

	class ItemizeChunk : public Chunk {
	public:
	std::vector<Chunk*> items;

	virtual ~ItemizeChunk() {
	for (auto item : items) {
	delete item;
	}
	}

	virtual void updateSizeForced(int maxWidth) override {
	cachedMaxWidth = maxWidth;
	cachedWidth = 0;
	cachedNumberOfLines = 0;

	for (auto item : items) {
	if (item) {
	item->updateSize(maxWidth - 16);
	cachedWidth = std::max(item->cachedWidth, cachedWidth);
	cachedNumberOfLines += item->cachedNumberOfLines;
	}
	}

	cachedWidth += 16;
	}

	virtual void createSurfaces(std::vector<SurfacePtr>& surfaces, std::vector<GUITextArea::Hyperlink2>& links) override {
	auto bmGUI = getImageManager().loadImage(getDataPath() + "gfx/gui.png");

	for (auto item : items) {
	if (item) {
	std::vector<SurfacePtr> tempSurfaces;
	const size_t oldLineCount = surfaces.size();
	const size_t oldLinkSize = links.size();
	item->createSurfaces(tempSurfaces, links);

	for (int i = 0, m = tempSurfaces.size(); i < m; i++) {
	SDL_Surface *src = tempSurfaces[i].get();
	SurfacePtr surface = createSurface(src->w + 16, src->h);

	SDL_Rect srcrect = { 0, 0, src->w, src->h };
	SDL_Rect dstrect = { 16, 0, src->w, src->h };
	SDL_BlitSurface(src, &srcrect, surface.get(), &dstrect);

	if (i == 0) {
	srcrect = SDL_Rect{ 80, 64, 16, 16 };
	dstrect = SDL_Rect{ 0, (src->h - 16) / 2, 16, 16 };
	SDL_BlitSurface(bmGUI, &srcrect, surface.get(), &dstrect);
	}

	surfaces.push_back(std::move(surface));
	}

	for (size_t i = oldLinkSize; i < links.size(); i++) {
	GUITextArea::Hyperlink2 &link = links[i];
	link.line += oldLineCount;
	link.startX += 16;
	link.endX += 16;
	}
	}
	}
	}
	};

	class TableChunk : public Chunk {
	public:
	int columns, rows;
	std::vector<Chunk*> items;
	std::vector<int> cachedRowWidth;

	static const int lineWidth = 16;

	TableChunk() : columns(0), rows(0) {}
	virtual ~TableChunk() {
	for (auto item : items) {
	delete item;
	}
	}

	virtual void updateSizeForced(int maxWidth) override {
	cachedMaxWidth = maxWidth;
	cachedWidth = 0;
	cachedNumberOfLines = 0;
	cachedRowWidth.clear();

	for (int i = 0; i < columns; i++) {
	int mw = (i < columns - 1) ? 0x40000000 : (maxWidth - lineWidth * 2 - cachedWidth);

	int w = 0;
	for (int j = 0; j < rows; j++) {
	auto item = items[j * columns + i];
	if (item) {
	item->updateSize(mw);
	w = std::max(item->cachedWidth, w);
	}
	}

	cachedRowWidth.push_back(w);
	cachedWidth += w + lineWidth;
	}
	cachedWidth += lineWidth;

	for (int j = 0; j < rows; j++) {
	int h = 0;
	for (int i = 0; i < columns; i++) {
	auto item = items[j * columns + i];
	if (item) {
	h = std::max(item->cachedNumberOfLines, h);
	}
	}
	cachedNumberOfLines += h;
	}
	cachedNumberOfLines += 3;
	}

	SurfacePtr createSurfaceWithGridLine(int height, bool drawHorizontal, int verticalTop, int verticalBottom) {
	SurfacePtr surface = createSurface(cachedWidth, height);

	SDL_Color fg = objThemes.getTextColor(true);
	Uint32 color = SDL_MapRGBA(surface->format, fg.r, fg.g, fg.b, 255);

	if (drawHorizontal) {
	SDL_Rect r = { lineWidth / 2, height / 2, cachedWidth - lineWidth, 1 };
	SDL_FillRect(surface.get(), &r, color);
	}
	if (verticalBottom > verticalTop) {
	SDL_Rect r = { lineWidth / 2, verticalTop, 1, verticalBottom - verticalTop };
	SDL_FillRect(surface.get(), &r, color);
	for (int w : cachedRowWidth) {
	r.x += w + lineWidth;
	SDL_FillRect(surface.get(), &r, color);
	}
	}

	return surface;
	}

	virtual void createSurfaces(std::vector<SurfacePtr>& surfaces, std::vector<GUITextArea::Hyperlink2>& links) override {
	int height = TTF_FontHeight(fontText) + 1;

	for (int j = 0; j < rows; j++) {
	if (j == 0) surfaces.push_back(createSurfaceWithGridLine(height, true, height / 2, height));

	const size_t oldLineCount = surfaces.size();

	std::vector<std::vector<SurfacePtr> > tempSurfaces(columns);
	int h = 0;
	int x = lineWidth;

	for (int i = 0; i < columns; i++) {
	auto item = items[j * columns + i];
	if (item) {
	const size_t oldLinkSize = links.size();
	item->createSurfaces(tempSurfaces[i], links);
	h = std::max<int>(tempSurfaces[i].size(), h);

	for (size_t k = oldLinkSize; k < links.size(); k++) {
	GUITextArea::Hyperlink2 &link = links[k];
	link.line += oldLineCount;
	link.startX += x;
	link.endX += x;
	}
	}
	x += cachedRowWidth[i] + lineWidth;
	}

	for (int y = 0; y < h; y++) {
	SurfacePtr surface = createSurfaceWithGridLine(height, false, 0, height);
	int x = lineWidth;

	for (int i = 0; i < columns; i++) {
	if (y < (int)tempSurfaces[i].size()) {
	auto src = tempSurfaces[i][y].get();
	SDL_Rect srcrect = { 0, 0, src->w, src->h };
	SDL_Rect dstrect = { x, 0, src->w, src->h };
	SDL_BlitSurface(src, &srcrect, surface.get(), &dstrect);
	}
	x += cachedRowWidth[i] + lineWidth;
	}

	surfaces.push_back(std::move(surface));
	}

	if (j == 0) surfaces.push_back(createSurfaceWithGridLine(height, true, 0, height));
	}

	surfaces.push_back(createSurfaceWithGridLine(height, true, 0, height / 2));
	}
	};

	class CodeChunk : public Chunk {
	public:
	std::vector<std::string> lines;

	virtual void updateSizeForced(int maxWidth) override {
	int width = 0;

	for (const std::string& s : lines) {
	int w = 0;
	TTF_SizeUTF8(fontMono, s.c_str(), &w, NULL);
	width = std::max(width, w);
	}

	cachedMaxWidth = maxWidth;
	cachedWidth = width;
	cachedNumberOfLines = lines.size() + 1;
	}

	virtual void createSurfaces(std::vector<SurfacePtr>& surfaces, std::vector<GUITextArea::Hyperlink2>& links) override {
	SDL_Color fg = objThemes.getTextColor(true);
	surfaces.emplace_back(TTF_RenderUTF8_Blended(fontText, "Copy code", fg));

	- links.push_back(GUITextArea::Hyperlink2{ surfaces.size() - 1, 0, surfaces.back()->w, "code:" });
	+ links.push_back(GUITextArea::Hyperlink2{ (int)surfaces.size() - 1, 0, surfaces.back()->w, "code:" });

	for (const std::string& s : lines) {
	surfaces.emplace_back(TTF_RenderUTF8_Blended(fontMono, s.c_str(), fg));
	links.back().url += s + "\n";
	}
	}
	};

	class HeaderChunk : public Chunk {
	public:
	int level;
	Chunk *child;

	HeaderChunk() : level(0), child(NULL) {}
	virtual ~HeaderChunk() {
	delete child;
	}

	int getAdditionalWidth() const {
	return (level <= 1) ? 0 : (level == 2) ? 24 : 20;
	}

	int getAdditionalHeight() const {
	return (level <= 1) ? 1 : 0;
	}

	virtual void updateSizeForced(int maxWidth) override {
	const int additionalWidth = getAdditionalWidth();
	const int additionalHeight = getAdditionalHeight();

	cachedMaxWidth = maxWidth;
	child->updateSize(maxWidth - additionalWidth);
	cachedWidth = child->cachedWidth + additionalWidth;
	cachedNumberOfLines = child->cachedNumberOfLines + additionalHeight;
	}

	virtual void createSurfaces(std::vector<SurfacePtr>& surfaces, std::vector<GUITextArea::Hyperlink2>& links) override {
	if (level <= 1) {
	child->createSurfaces(surfaces, links);

	int h = TTF_FontHeight(fontText);
	SurfacePtr surface = createSurface(cachedWidth, h);

	SDL_Color fg = objThemes.getTextColor(true);
	Uint32 color = SDL_MapRGBA(surface->format, fg.r, fg.g, fg.b, 255);

	if (level <= 0) {
	SDL_Rect r[2] = {
	{ 0, h / 2 - 3, cachedWidth, 2 },
	{ 0, h / 2 + 1, cachedWidth, 2 },
	};
	SDL_FillRects(surface.get(), r, 2, color);
	} else {
	SDL_Rect r = { 0, h / 2 - 1, cachedWidth, 2 };
	SDL_FillRect(surface.get(), &r, color);
	}

	surfaces.push_back(std::move(surface));
	} else {
	auto bmGUI = getImageManager().loadImage(getDataPath() + "gfx/gui.png");

	const size_t oldLineCount = surfaces.size();
	const size_t oldLinkSize = links.size();

	std::vector<SurfacePtr> tempSurfaces;
	child->createSurfaces(tempSurfaces, links);

	const int additionalWidth = getAdditionalWidth();

	for (size_t i = oldLinkSize; i < links.size(); i++) {
	GUITextArea::Hyperlink2 &link = links[i];
	link.line += oldLineCount;
	link.startX += additionalWidth;
	link.endX += additionalWidth;
	}

	for (int i = 0, m = tempSurfaces.size(); i < m; i++) {
	SDL_Surface *src = tempSurfaces[i].get();
	SurfacePtr surface = createSurface(src->w + additionalWidth, src->h);

	SDL_Rect srcrect = { 0, 0, src->w, src->h };
	SDL_Rect dstrect = { additionalWidth, 0, src->w, src->h };
	SDL_BlitSurface(src, &srcrect, surface.get(), &dstrect);

	if (i == 0) {
	if (level == 2) {
	srcrect = SDL_Rect{ 64, 0, 16, 16 };
	} else {
	srcrect = SDL_Rect{ 96, 16, 16, 16 };
	}
	dstrect = SDL_Rect{ (additionalWidth - 16) / 2, (src->h - 16) / 2, 16, 16 };
	SDL_BlitSurface(bmGUI, &srcrect, surface.get(), &dstrect);
	}

	surfaces.push_back(std::move(surface));
	}
	}
	}
	};

	class HelpPage {
	public:
	int level;
	std::string title;
	std::string nameSpace;
	std::vector<Chunk*> chunks;

	static const int BIGGEST_LEVEL = 10;

	HelpPage() : level(0) {}
	~HelpPage() {
	for (auto chunk : chunks) {
	delete chunk;
	}
	}

	void show(SDL_Renderer& renderer, GUITextArea *textArea) {
	SDL_Color fg = objThemes.getTextColor(true);
	std::vector<SurfacePtr> surfaces;
	std::vector<GUITextArea::Hyperlink2> links;

	for (auto chunk : chunks) {
	if (chunk) {
	chunk->updateSize(textArea->width - 16);
	chunk->createSurfaces(surfaces, links);
	surfaces.emplace_back(TTF_RenderUTF8_Blended(fontText, " ", fg));
	}
	}

	textArea->setStringArray(renderer, surfaces);
	textArea->setHyperlinks(links);
	}
	};

	void parseText(const std::vector<std::string>& lines, size_t start, size_t end, size_t startOfNonSpaces, std::string& output) {
	bool init = false;

	for (size_t i = start; i < end; i++) {
	size_t lp = (i == start) ? startOfNonSpaces : 0;
	const std::string& line = lines[i];
	bool isSpace = true, isVerbatim = false;
	for (; lp < line.size(); lp++) {
	char c = line[lp];
	if (c == ' ' \|\| c == '\t') {
	if (isVerbatim) output.push_back(' ');
	isSpace = true;
	} else {
	if (!isVerbatim && init && isSpace) output.push_back(' ');
	if (c == '`') isVerbatim = !isVerbatim;
	output.push_back(c);
	init = true;
	isSpace = false;
	}
	}
	}
	}

	ParagraphChunk* parseParagraph(const std::vector<std::string>& lines, size_t start, size_t end, size_t startOfNonSpaces) {
	auto ret = new ParagraphChunk;
	parseText(lines, start, end, startOfNonSpaces, ret->text);
	return ret;
	}

	CodeChunk* parseCode(const std::vector<std::string>& lines, size_t start, size_t end) {
	auto ret = new CodeChunk;
	for (size_t i = start; i < end; i++) {
	ret->lines.push_back(lines[i]);
	}
	return ret;
	}

	ItemizeChunk* parseItemize(const std::vector<std::string>& lines, size_t start, size_t end, char marker) {
	auto ret = new ItemizeChunk;
	size_t last = start, startOfNonSpaces = 0;

	for (size_t i = start; i <= end; i++) {
	bool isNewItem = false;
	size_t lp = 0;

	if (i < end) {
	lp = lines[i].find_first_not_of(" \t");
	if (lp != std::string::npos && lp + 1 < (int)lines[i].size() && lines[i][lp] == marker) {
	char c = lines[i][lp + 1];
	isNewItem = (c == ' ' \|\| c == '\t');
	}
	} else {
	isNewItem = true;
	}

	if (isNewItem) {
	if (last != i) {
	ret->items.push_back(parseParagraph(lines, last, i, startOfNonSpaces));
	}
	last = i;
	startOfNonSpaces = lp + 1;
	}
	}
	return ret;
	}

	void parseRow(const std::string& text, std::vector<std::string>& output) {
	output.clear();

	size_t lps = text.find_first_not_of(" \t");
	if (lps == std::string::npos) return;
	if (text[lps] == '\|') lps++;

	size_t lpe = text.find_last_not_of(" \t");
	if (lpe < lps) return;
	if (text[lpe] != '\|') lpe++;

	std::string item;

	for (size_t lp = lps; lp <= lpe; lp++) {
	char c = (lp < lpe) ? text[lp] : '\|';
	if (c == '\|') {
	output.push_back(item);
	item.clear();
	} else {
	item.push_back(c);
	}
	}
	}

	TableChunk* parseTable(const std::vector<std::string>& lines, size_t start, size_t end) {
	auto ret = new TableChunk;

	std::vector<std::string> row;

	//determine the number of columns
	parseRow(lines[start], row);
	int columns = row.size(), rows = 0;

	if (columns > 0) {
	ret->columns = columns;
	ret->rows = rows = end - start - 1;
	ret->items.resize(columns * rows, NULL);

	for (int i = 0; i < columns; i++) {
	ret->items[i] = parseParagraph(row, i, i + 1, 0);
	}

	for (int j = 1; j < rows; j++) {
	parseRow(lines[start + j + 1], row);
	for (int i = 0, m = std::min<int>(row.size(), columns); i < m; i++) {
	ret->items[j * columns + i] = parseParagraph(row, i, i + 1, 0);
	}
	}
	}

	return ret;
	}

	HeaderChunk* parseHeader(const std::vector<std::string>& lines, size_t start, size_t end, size_t startOfNonSpaces, int level) {
	auto ret = new HeaderChunk;
	ret->level = level;
	ret->child = parseParagraph(lines, start, end, startOfNonSpaces);
	return ret;
	}

	Chunk* parseChunk(const std::vector<std::string>& lines, size_t& start) {
	size_t end, startOfNonSpaces;

	// skip empty lines
	for (; start < lines.size(); start++) {
	startOfNonSpaces = lines[start].find_first_not_of(" \t");
	if (startOfNonSpaces != std::string::npos) break;
	}

	if (start >= lines.size()) return NULL;

	// check if it's code
	if (lines[start].find("~~~") == 0) {
	start++;
	if (start >= lines.size()) return NULL;
	for (end = start; end < lines.size(); end++) {
	if (lines[end].find("~~~") == 0) break;
	}
	auto ret = parseCode(lines, start, end);
	start = end + 1;
	return ret;
	} else {
	for (end = start; end < lines.size(); end++) {
	if (lines[end].find_first_not_of(" \t") == std::string::npos) break;
	}
	}

	if (end == start) return NULL;

	// check if it's itemize
	if (startOfNonSpaces + 1 < (int)lines[start].size()) {
	char c = lines[start][startOfNonSpaces];
	char c2 = lines[start][startOfNonSpaces + 1];
	if ((c == '*' \|\| c == '+' \|\| c == '-') && (c2 == ' ' \|\| c2 == '\t')) {
	auto ret = parseItemize(lines, start, end, c);
	start = end;
	return ret;
	}
	}

	// check if it's table
	if (end - start >= 3 && lines[start].find_first_of('\|') != std::string::npos && lines[start + 1].find_first_not_of(" \t-\|") == std::string::npos) {
	auto ret = parseTable(lines, start, end);
	start = end;
	return ret;
	}

	// check if it's header of syntax "### title"
	if (lines[start][startOfNonSpaces] == '#') {
	int level = 0;
	for (; level < 5; level++) {
	if ((size_t)(startOfNonSpaces + level + 1) >= lines[start].size()) {
	level = -1;
	break;
	}
	char c = lines[start][startOfNonSpaces + level + 1];
	if (c == ' ' \|\| c == '\t') break;
	else if (c != '#') {
	level = -1;
	break;
	}
	}
	if (level >= 0) {
	auto ret = parseHeader(lines, start, end, startOfNonSpaces + level + 1, level);
	start = end;
	return ret;
	}
	}

	// check if it's header of syntax "title\n==="
	if (end - start >= 2) {
	int level = -1;
	if (lines[end - 1].find_first_not_of(" \t=") == std::string::npos) level = 0;
	else if (lines[end - 1].find_first_not_of(" \t-") == std::string::npos) level = 1;
	if (level >= 0) {
	auto ret = parseHeader(lines, start, end - 1, startOfNonSpaces, level);
	start = end;
	return ret;
	}
	}

	// now assume it's a normal paragraph
	auto ret = parseParagraph(lines, start, end, startOfNonSpaces);
	start = end;
	return ret;
	}

	class HelpWindow : public GUIWindow {
	public:
	int currentPage;
	std::vector<int> history;
	int currentHistory;

	public:
	HelpWindow(ImageManager& imageManager, SDL_Renderer& renderer, int left = 0, int top = 0, int width = 0, int height = 0,
	bool enabled = true, bool visible = true, const char* caption = NULL)
	: GUIWindow(imageManager, renderer, left, top, width, height, enabled, visible, caption)
	, currentPage(0)
	, currentHistory(0)
	{
	}
	};

	HelpManager::HelpManager(GUIEventCallback *parent)
	: parent(parent)
	{
	std::vector<std::string> lines;

	{
	std::ifstream fin((getDataPath() + "../docs/ScriptAPI.md").c_str());
	if (fin) {
	//Loop the lines of the file.
	std::string line;
	char c;
	while (fin.get(c)) {
	if (c == '\r') {
	} else if (c == '\n') {
	lines.push_back(line);
	line.clear();
	} else {
	line.push_back(c);
	}
	}
	lines.push_back(line);
	} else {
	std::cerr << "ERROR: Unable to open the ScriptAPI.md file." << std::endl;
	lines.push_back("ERROR: Unable to open the ScriptAPI.md file.");
	}
	}

	{
	std::string library, nameSpace;
	HelpPage *page = new HelpPage;

	size_t start = 0;
	while (auto chunk = parseChunk(lines, start)) {
	if (HeaderChunk header = dynamic_cast<HeaderChunk>(chunk)) {
	//We parse a new header so add a new page.
	if (!page->chunks.empty()) {
	pages.push_back(page);
	page = new HelpPage;
	}

	page->level = header->level;

	//Get the title.
	if (auto par = dynamic_cast<ParagraphChunk*>(header->child)) {
	page->title = par->text;

	//Get the library name.
	if (page->title.find("library") != std::string::npos) {
	library.clear();
	nameSpace.clear();
	size_t lps = page->title.find_first_of('\"');
	if (lps != std::string::npos) {
	size_t lpe = page->title.find_last_of('\"');
	if (lpe > lps) {
	library = page->title.substr(lps + 1, lpe - lps - 1);
	}
	}
	}

	//Get the namespace.
	if (page->title.find("Global") != std::string::npos) {
	nameSpace.clear();
	} else if (page->title.find("Static") != std::string::npos) {
	nameSpace = library + ".";
	} else if (page->title.find("Member") != std::string::npos) {
	nameSpace = library + ":";
	}
	}
	}

	if (ItemizeChunk itemize = library.empty() ? NULL : dynamic_cast<ItemizeChunk>(chunk)) {
	//We parse a new header so add a new page.
	if (!page->chunks.empty()) {
	pages.push_back(page);
	page = new HelpPage;
	}

	page->level = HelpPage::BIGGEST_LEVEL;
	page->nameSpace = nameSpace;

	//Get the title.
	if (ParagraphChunk par = itemize->items.empty() ? NULL : dynamic_cast<ParagraphChunk>(itemize->items[0])) {
	page->title = par->text;
	}
	}

	page->chunks.push_back(chunk);
	}

	if (page->chunks.empty()) delete page;
	else pages.push_back(page);
	}

	//Normalize the title of each page
	for (auto page : pages) {
	if (page->title.find_first_of("(/") != std::string::npos \|\| page->title.find("--") != std::string::npos) {
	std::string tmp = page->title;
	size_t lp = tmp.find("--");
	if (lp != std::string::npos) tmp = tmp.substr(0, lp);

	std::vector<std::string> names;

	std::istringstream stream(tmp);
	std::string line;
	while (std::getline(stream, line, '/')) {
	lp = line.find_first_of('(');
	if (lp != std::string::npos) line = line.substr(0, lp);
	lp = line.find_first_not_of(" \t");
	if (lp != std::string::npos) {
	line = line.substr(lp, line.find_last_not_of(" \t") - lp + 1);
	if (std::find(names.begin(), names.end(), line) == names.end()) {
	names.push_back(line);
	}
	}
	}

	tmp.clear();
	for (const std::string& s : names) {
	if (!tmp.empty()) tmp.push_back('/');
	tmp += s;
	}

	page->title = tmp;
	}

	//Also normize the contents if necessary.
	if (ItemizeChunk itemize = page->chunks.empty() ? NULL : dynamic_cast<ItemizeChunk>(page->chunks[0])) {
	if (ParagraphChunk par = itemize->items.empty() ? NULL : dynamic_cast<ParagraphChunk>(itemize->items[0])) {
	size_t lp = par->text.find("--");
	if (lp != std::string::npos) {
	std::vector<std::string> temp;
	temp.push_back(par->text.substr(lp + 2));
	page->chunks.push_back(parseParagraph(temp, 0, 1, 0));

	lp = par->text.find_last_not_of(" \t", lp);
	if (lp != std::string::npos) par->text = par->text.substr(0, lp);
	}
	}
	}
	}

	//Add hyperlinks of subpages to each page
	for (size_t i = 0; i < pages.size(); i++) {
	auto page = pages[i];
	int minLevel = 0, maxLevel = -1;
	if (i == 0) {
	maxLevel = 1;
	} else {
	minLevel = page->level + 1;
	maxLevel = (page->level == 0) ? 1 : HelpPage::BIGGEST_LEVEL;
	}

	FakeTOCChunk *chunk = NULL;
	int prevLevel = -1;
	for (size_t j = i + 1; j < pages.size(); j++) {
	auto subpage = pages[j];
	if (subpage->level < minLevel) break;
	if (subpage->level > maxLevel) continue;

	int level;
	if (subpage->level == HelpPage::BIGGEST_LEVEL) {
	level = prevLevel + 1;
	} else {
	prevLevel = level = subpage->level - minLevel;
	}

	if (chunk == NULL) chunk = new FakeTOCChunk;
	- chunk->items.push_back(FakeTOCItem{ subpage->title, level, j });
	+ chunk->items.push_back(FakeTOCItem{ subpage->title, level, (int)j });
	}

	if (chunk) page->chunks.push_back(chunk);
	}
	}

	HelpManager::~HelpManager() {
	for (auto page : pages) {
	delete page;
	}
	}

	void HelpManager::updateCurrentPage(ImageManager& imageManager, SDL_Renderer& renderer, HelpWindow *window, int currentPage, bool addToHistory) {
	auto sllb = dynamic_cast<GUISingleLineListBox*>(window->getChild("sllb"));
	auto textArea = dynamic_cast<GUITextArea*>(window->getChild("TextArea"));
	if (sllb && textArea && currentPage != window->currentPage) {
	//Set current page
	window->currentPage = currentPage;

	//Update history
	if (addToHistory) {
	window->currentHistory++;
	window->history.resize(window->currentHistory);
	window->history.push_back(currentPage);
	}

	auto page = pages[currentPage];

	//Show contents
	page->show(renderer, textArea);

	char s[32];
	- sprintf(s, "%d/%d ", currentPage + 1, pages.size());
	+ sprintf(s, "%d/%d ", currentPage + 1, (int)pages.size());
	sllb->item[1].second = s + page->nameSpace + page->title;
	sllb->value = 1;
	}
	}

	GUIWindow* HelpManager::newWindow(ImageManager& imageManager, SDL_Renderer& renderer, int pageIndex) {
	//Create the GUI.
	HelpWindow* root = new HelpWindow(imageManager, renderer, (SCREEN_WIDTH - 600) / 2, (SCREEN_HEIGHT - 500) / 2, 600, 500, true, true, _("Scripting Help"));
	root->minWidth = root->width; root->minHeight = root->height;
	root->name = "scriptingHelpWindow";
	root->eventCallback = this;

	GUIButton* btn;

	const int BUTTON_SPACE = 70;

	//Some navigation buttons
	btn = new GUIButton(imageManager, renderer, root->width / 2 - BUTTON_SPACE * 3, 60, -1, 36, _("Homepage"), 0, true, true, GUIGravityCenter);
	btn->gravityLeft = btn->gravityRight = GUIGravityCenter;
	btn->name = "Homepage";
	btn->smallFont = true;
	btn->eventCallback = root;
	root->addChild(btn);
	btn = new GUIButton(imageManager, renderer, root->width / 2 - BUTTON_SPACE, 60, -1, 36, _("Back"), 0, true, true, GUIGravityCenter);
	btn->gravityLeft = btn->gravityRight = GUIGravityCenter;
	btn->name = "Back";
	btn->smallFont = true;
	btn->eventCallback = root;
	root->addChild(btn);
	btn = new GUIButton(imageManager, renderer, root->width / 2 + BUTTON_SPACE, 60, -1, 36, _("Forward"), 0, true, true, GUIGravityCenter);
	btn->gravityLeft = btn->gravityRight = GUIGravityCenter;
	btn->name = "Forward";
	btn->smallFont = true;
	btn->eventCallback = root;
	root->addChild(btn);
	btn = new GUIButton(imageManager, renderer, root->width / 2 + BUTTON_SPACE * 3, 60, -1, 36, _("Search"), 0, true, true, GUIGravityCenter);
	btn->gravityLeft = btn->gravityRight = GUIGravityCenter;
	btn->name = "Search";
	btn->smallFont = true;
	btn->eventCallback = root;
	root->addChild(btn);

	//Some buttons for search mode
	btn = new GUIButton(imageManager, renderer, root->width / 2 - BUTTON_SPACE * 3, 60, -1, 36, _("Back"), 0, true, false, GUIGravityCenter);
	btn->gravityLeft = btn->gravityRight = GUIGravityCenter;
	btn->name = "Back2";
	btn->smallFont = true;
	btn->eventCallback = root;
	root->addChild(btn);
	btn = new GUIButton(imageManager, renderer, root->width / 2 + BUTTON_SPACE * 3, 60, -1, 36, _("Goto"), 0, true, false, GUIGravityCenter);
	btn->gravityLeft = btn->gravityRight = GUIGravityCenter;
	btn->name = "Goto";
	btn->smallFont = true;
	btn->eventCallback = root;
	root->addChild(btn);

	//Add a single line list box to select page directly
	GUISingleLineListBox *sllb = new GUISingleLineListBox(imageManager, renderer, 25, 100, 550, 36);
	sllb->gravityRight = GUIGravityRight;
	sllb->name = "sllb";
	sllb->item.resize(3);
	sllb->value = 1;
	sllb->eventCallback = root;
	root->addChild(sllb);

	//Add a text area.
	GUITextArea *textArea = new GUITextArea(imageManager, renderer, 25, 140, 550, 300);
	textArea->gravityRight = textArea->gravityBottom = GUIGravityRight;
	textArea->name = "TextArea";
	textArea->editable = false;
	textArea->eventCallback = root;
	root->addChild(textArea);

	//Some widgets for search mode
	GUITextBox *textBox = new GUITextBox(imageManager, renderer, 25, 100, 550, 36, NULL, 0, true, false);
	textBox->gravityRight = GUIGravityRight;
	textBox->name = "TextSearch";
	textBox->eventCallback = root;
	root->addChild(textBox);
	GUIListBox *listBox = new GUIListBox(imageManager, renderer, 25, 140, 550, 300, true, false);
	listBox->gravityRight = listBox->gravityBottom = GUIGravityRight;
	listBox->name = "List";
	root->addChild(listBox);

	//The close button
	btn = new GUIButton(imageManager, renderer, int(root->width*0.5f), 500 - 44, -1, 36, _("Close"), 0, true, true, GUIGravityCenter);
	btn->gravityLeft = btn->gravityRight = GUIGravityCenter;
	btn->gravityTop = btn->gravityBottom = GUIGravityRight;
	btn->name = "cfgCancel";
	btn->eventCallback = root;
	root->addChild(btn);

	//Show contents.
	if (pageIndex < 0 \|\| pageIndex >= (int)pages.size()) pageIndex = 0;
	root->currentPage = -1;
	updateCurrentPage(imageManager, renderer, root, pageIndex, false);
	root->history.push_back(pageIndex);

	return root;
	}

	void HelpManager::GUIEventCallback_OnEvent(ImageManager& imageManager, SDL_Renderer& renderer, std::string name, GUIObject* obj, int eventType) {
	HelpWindow window = dynamic_cast<HelpWindow>(obj);

	if (name == "Homepage") {
	if (SDL_GetModState() & KMOD_CTRL) {
	GUIObjectRoot->addChild(newWindow(imageManager, renderer));
	} else {
	updateCurrentPage(imageManager, renderer, window, 0, true);
	}
	return;
	} else if (name == "Back") {
	if (window->currentHistory > 0) {
	window->currentHistory--;
	updateCurrentPage(imageManager, renderer, window, window->history[window->currentHistory], false);
	}
	return;
	} else if (name == "Forward") {
	if (window->currentHistory < (int)window->history.size() - 1) {
	window->currentHistory++;
	updateCurrentPage(imageManager, renderer, window, window->history[window->currentHistory], false);
	}
	return;
	} else if (name == "sllb") {
	auto sllb = dynamic_cast<GUISingleLineListBox*>(window->getChild("sllb"));
	if (sllb && sllb->value != 1) {
	int index = window->currentPage + sllb->value - 1;
	sllb->value = 1;
	if (index >= 0 && index < (int)pages.size()) {
	if (SDL_GetModState() & KMOD_CTRL) {
	GUIObjectRoot->addChild(newWindow(imageManager, renderer, index));
	} else {
	updateCurrentPage(imageManager, renderer, window, index, true);
	}
	}
	}
	return;
	} else if (name == "Search" \|\| name == "Back2") {
	bool isSearch = name == "Search";

	if (auto o = obj->getChild("Homepage")) o->visible = !isSearch;
	if (auto o = obj->getChild("Back")) o->visible = !isSearch;
	if (auto o = obj->getChild("Forward")) o->visible = !isSearch;
	if (auto o = obj->getChild("Search")) o->visible = !isSearch;
	if (auto o = obj->getChild("sllb")) o->visible = !isSearch;
	if (auto o = obj->getChild("TextArea")) o->visible = !isSearch;
	if (auto o = obj->getChild("Back2")) o->visible = isSearch;
	if (auto o = obj->getChild("Goto")) o->visible = isSearch;

	auto textBox = obj->getChild("TextSearch");
	auto listBox = dynamic_cast<GUIListBox*>(obj->getChild("List"));
	if (textBox && listBox) {
	textBox->visible = isSearch;
	listBox->visible = isSearch;
	if (isSearch && listBox->item.empty()) {
	updateListBox(imageManager, renderer, listBox, textBox->caption);
	}
	}

	return;
	} else if (name == "Goto") {
	auto listBox = dynamic_cast<GUIListBox*>(obj->getChild("List"));
	auto textArea = dynamic_cast<GUITextArea*>(obj->getChild("TextArea"));
	if (listBox && textArea && listBox->value >= 0 && listBox->value < (int)listBox->item.size()) {
	const std::string& s = listBox->item[listBox->value];
	int index = atoi(s.c_str());
	if (index >= 0 && index < (int)pages.size()) {
	if (SDL_GetModState() & KMOD_CTRL) {
	GUIObjectRoot->addChild(newWindow(imageManager, renderer, index));
	} else {
	updateCurrentPage(imageManager, renderer, window, index, true);
	GUIEventQueue.push_back(GUIEvent{ this, "Back2", obj, GUIEventClick });
	}
	}
	}
	return;
	} else if (name == "TextArea") {
	auto textArea = dynamic_cast<GUITextArea*>(obj->getChild("TextArea"));
	if (textArea && textArea->clickedHyperlink.size() > 5) {
	std::string s = textArea->clickedHyperlink.substr(0, 5);
	if (s == "code:") {
	SDL_SetClipboardText(textArea->clickedHyperlink.c_str() + 5);
	} else if (s == "page:") {
	int index = atoi(textArea->clickedHyperlink.c_str() + 5);
	if (index >= 0 && index < (int)pages.size()) {
	if (SDL_GetModState() & KMOD_CTRL) {
	GUIObjectRoot->addChild(newWindow(imageManager, renderer, index));
	} else {
	updateCurrentPage(imageManager, renderer, window, index, true);
	}
	}
	}
	}
	return;
	} else if (name == "TextSearch") {
	auto textBox = obj->getChild("TextSearch");
	auto listBox = dynamic_cast<GUIListBox*>(obj->getChild("List"));
	if (textBox && listBox) {
	updateListBox(imageManager, renderer, listBox, textBox->caption);
	}
	return;
	}

	//Do the default.
	parent->GUIEventCallback_OnEvent(imageManager, renderer, name, obj, eventType);
	}

	void HelpManager::updateListBox(ImageManager& imageManager, SDL_Renderer& renderer, GUIListBox *listBox, const std::string& keyword) {
	std::vector<std::string> keywords;

	std::string line;
	for (char c : keyword) {
	if (c == ' ' \|\| c == '\t') {
	if (!line.empty()) keywords.push_back(line);
	line.clear();
	} else {
	line.push_back(tolower((unsigned char)c));
	}
	}
	if (!line.empty()) keywords.push_back(line);

	int backup = listBox->value;

	listBox->clearItems();

	for (size_t i = 0; i < pages.size(); i++) {
	HelpPage *page = pages[i];

	bool match = true;
	std::string tmp;
	for (char c : page->title) {
	tmp.push_back(tolower((unsigned char)c));
	}

	for (const std::string& s : keywords) {
	if (tmp.find(s) == std::string::npos) {
	match = false;
	break;
	}
	}
	if (match) {
	SharedTexture tex;
	SDL_Color fg = objThemes.getTextColor(true);

	if (page->level == HelpPage::BIGGEST_LEVEL) {
	SDL_Color fg2 = { Uint8((255 + fg.r) / 2), Uint8((255 + fg.g) / 2), Uint8((255 + fg.b) / 2), Uint8(255) };

	SurfacePtr surf1(TTF_RenderUTF8_Blended(fontMono, (std::string(5, ' ') + page->nameSpace).c_str(), fg2));
	SurfacePtr surf2(TTF_RenderUTF8_Blended(fontMono, page->title.empty() ? " " : page->title.c_str(), fg));

	SurfacePtr surf = createSurface(surf1->w + surf2->w, std::max(surf1->h, surf2->h) + 4);

	SDL_Rect srcrect = { 0, 0, surf1->w, surf1->h };
	SDL_Rect dstrect = { 0, 2, surf1->w, surf1->h };
	SDL_BlitSurface(surf1.get(), &srcrect, surf.get(), &dstrect);
	srcrect = SDL_Rect{ 0, 0, surf2->w, surf2->h };
	dstrect = SDL_Rect{ surf1->w, 2, surf2->w, surf2->h };
	SDL_BlitSurface(surf2.get(), &srcrect, surf.get(), &dstrect);

	tex = textureFromSurface(renderer, std::move(surf));
	} else {
	tex = textureFromTextShared(renderer, *fontText,
	(std::string(page->level, ' ') + page->title).c_str(),
	fg);
	}

	char s[32];
	- sprintf(s, "%d", i);
	+ sprintf(s, "%d", (int)i);
	listBox->addItem(renderer, s, tex);
	}
	}

	listBox->value = (backup >= 0 && backup < (int)listBox->item.size()) ? backup : -1;
	}

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