Function debug_format_message

src/libdebug/dchannel.cpp:19–80

std::string debug_format_message(debug_level::flag level, const std::string& domain,
				debug_format::flags& format_flags, int indent_level, bool is_first_line, const std::string& msg)
{
	if (msg.empty())
		return msg;

	std::string ret;
	ret.reserve(msg.size() + 40);  // indentation + domain/level

	// allow prefix only for first line and others when first_line_only is disabled
	if (is_first_line || !format_flags.test(debug_format::first_line_only)) {

		if (format_flags.test(debug_format::datetime)) {  // print time
			ret += hz::format_date("%Y-%m-%d %H:%M:%S: ", true);
		}

		if (format_flags.test(debug_format::level)) {  // print level name
			const bool use_color = format_flags.test(debug_format::color);
			if (use_color)
				ret += debug_level::get_color_start(level);

			const std::string level_name = std::string("<") + debug_level::get_name(level) + ">";
			ret += level_name + std::string(8 - level_name.size(), ' ');

			if (use_color)
				ret += debug_level::get_color_stop(level);
		}

		if (format_flags.test(debug_format::domain)) {  // print domain name
			ret += std::string("[") + domain + "] ";
		}

	}


	if (format_flags.test(debug_format::indent)) {
		const std::string spaces(static_cast<std::size_t>(indent_level * 4), ' ');  // indentation spaces

		// replace all newlines with \n(indent-spaces) except for the last one.
		std::string::size_type oldpos = 0, pos = 0;
		while(pos != std::string::npos) {
			if (pos == 0) {
				ret.insert(0, spaces);
			} else {
				ret.append(spaces);
			}
			pos = msg.find('\n', oldpos);
			if (pos != std::string::npos)
				pos++;
			if (pos >= msg.size())
				pos = std::string::npos;

			ret.append(msg, oldpos, pos - oldpos);
			oldpos = pos;
		}

	} else {
		ret += msg;