Method LoadTextfile

src/textfile_gui.cpp:851–898

* Loads the textfile text from file and setup #lines. */ virtual */

 * Loads the textfile text from file and setup #lines.
 */
/* virtual */ void TextfileWindow::LoadTextfile(const std::string &textfile, Subdirectory dir)
{
	this->lines.clear();
	this->jumplist.clear();

	if (this->GetWidget<NWidgetStacked>(WID_TF_SEL_JUMPLIST)->SetDisplayedPlane(SZSP_HORIZONTAL)) this->ReInit();

	if (textfile.empty()) return;

	/* Get text from file */
	size_t filesize;
	auto handle = FioFOpenFile(textfile, "rb", dir, &filesize);
	if (!handle.has_value()) return;
	/* Early return on empty files. */
	if (filesize == 0) return;

	std::vector<char> buf;
	buf.resize(filesize);
	size_t read = fread(buf.data(), 1, buf.size(), *handle);

	if (read != buf.size()) return;

#if defined(WITH_ZLIB)
	/* In-place gunzip */
	if (textfile.ends_with(".gz")) buf = Gunzip(buf);
#endif

#if defined(WITH_LIBLZMA)
	/* In-place xunzip */
	if (textfile.ends_with(".xz")) buf = Xunzip(buf);
#endif

	if (buf.empty()) return;

	std::string_view sv_buf(buf.data(), buf.size());

	/* Check for the byte-order-mark, and skip it if needed. */
	if (sv_buf.starts_with("\ufeff")) sv_buf.remove_prefix(3);

	/* Update the filename. */
	this->filepath = textfile;
	this->filename = this->filepath.substr(this->filepath.find_last_of(PATHSEP) + 1);
	/* If it's the first file being loaded, add to history. */
	if (this->history.empty()) this->history.emplace_back(this->filepath, 0);

	/* Process the loaded text into lines, and do any further parsing needed. */
	this->LoadText(sv_buf);
}

/**
 * Load a text into the textfile viewer.