ColoredSTDLogSink.cpp

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* logtools                                                                                                             *
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/**
	@file
	@brief		Implementation of ColoredSTDLogSink
	@ingroup	liblog
 */

#include "log.h"
#include <cstdio>
#include <cstdarg>
#include <string>

using namespace std;

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Construction / destruction

ColoredSTDLogSink::ColoredSTDLogSink(Severity min_severity)
	: STDLogSink(min_severity)
{

}

ColoredSTDLogSink::~ColoredSTDLogSink()
{
}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Logging

void ColoredSTDLogSink::PreprocessLine(std::string& line)
{
	//strings we make red
	static string red_strings[] =
	{
		"INTERNAL ERROR",
		"ERROR",
		"Error",
		"error",
	};

	//ANSI escape codes
	static string red = "\033[31;1m";
	static string yellow = "\033[33;1m";
	static string clear = "\033[0m";

	//Bold red errors. If there's a colon after the message, do that too
	for(auto s : red_strings)
	{
		line = replace(s + ":", red, clear, line);
		//line = replace(s, red + s + clear, line);
	}

	//strings we make yellow
	static string yellow_strings[] =
	{
		"WARNING",
		"Warning",
		"warning"
	};

	//Bold yellow warnings. If there's a colon after the message, do that too
	for(auto s : yellow_strings)
	{
		line = replace(s + ":", yellow, clear, line);
		//line = replace(s, yellow + s + clear, line);
	}
}

/**
	@brief Replaces warning keywords with ANSI escape sequences

	@param search	String to look for
	@param before	Prepended to the output if matched
	@param after	Inserted after the search string if matched
	@param subject	Input string

	@param Colorized string
 */
string ColoredSTDLogSink::replace(
	const string& search,
	const string& before,
	const string& after,
	string subject)
{
	//If not found, return unchanged
	size_t pos = subject.find(search);
	if(pos == string::npos)
		return subject;

	//If found, change color starting beginning of the line until end of the string
	size_t end = pos + search.length();
	string ret = before;
	ret += subject.substr(0, end);
	ret += after;
	ret += subject.substr(end);
	return ret;
}